AAT3604B SKYWORKS

Document overview

  • Manufacturer or author: Provided By digicamel.com
  • PDF pages: 26

Technical content

Total Power Solution for Micro Power Applications Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202213A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012 General Description The AAT3604B is a micropower PMU optimized for maxi- mum lithium-ion (polymer) battery life both in opera - tional and standby mode. The total no load current into V IN when all functions are enabled is only 70µA. The AAT3604B is a highly integrated device which simpli- fies system level design for the user with minimal exter- nal components required. It contains a step-up (boost) converter, a step-down (buck) converter, an LDO regula- tor and a single-cell Lithium Ion/Polymer battery charger in a single PMU. The device also includes a load switch for dynamic power path/sleep mode operation for pro - cessor core voltage, making it ideal for ultra low power portable devices. The battery charger is a complete, thermally protected constant current/constant voltage linear charger. It includes an integrated pass device, reverse blocking pro- tection, high accuracy current and voltage regulation, charge status indication, and charge termination. The step-up DC/DC converter is a high efficiency boost con- verter capable of 27V maximum output voltage. It is the ideal power solution to power OLED, LCD, and CCD appli- cations. The step-up converter offers a true load discon- nect feature which isolates the load from the power source when EN1 is pulled low. This eliminates leakage current and isolates the output while the device is dis - abled. The step-down DC/DC converter is integrated with inter- nal compensation and operates up to a switching fre - quency of 1.6MHz, thus minimizing the size of external components while keeping switching losses low and effi- ciency high. The LDO regulator offers 60dB power supply rejection ratio (PSRR) and low noise operation, making it suitable for powering noise-sensitive loads. The AAT3604B is available in a space-saving, thermally enhanced 24-pin QFN44 package. Features/Performance

  • VIN: 2.7V to 5.5V
  • Minimum External Components
  • Less than 1.1mm Height for all External Components
  • Total Standby Mode Ground Current 1µA (VO1, VO2, and VO3 enabled).
  • 1.8V Enable Logic
  • Core Voltage Switchover in Standby Mode
  • LDO Input Current Minimized for 5µA Typical Load
  • Buck Efficiency Optimized for 0.6mA Load
  • Separate Enable Pins for Each Supply Output
  • Over-Current Protection
  • Over-Temperature Protection
  • 24-Pin 4x4 QFN package Step-Up (Boost) Converter
  • 6.0 to 10V @ 2mA Output Step-Down (Buck) Converter
  • 0.6V to V IN @ 25mA Output LDO Regulator (AUX) 2.0 to 2.6V/5mA @ VIN = 3.6V
  • PSRR: 60dB@100Hz
  • Noise: 175µVrms Battery Charger (3.0V) Lithium-Ion/Polymer Battery Charger
  • Digitized Thermal Regulation
  • Charge Current Programming up to 100mA
  • Charge Current Termination Programming
  • Automatic Trickle Charge for Battery Preconditioning
  • Charge Status Indicator

Applications

  • 3D Goggles
  • GPS Tracking Units
  • Remote Sensors
  • Spy Modules DISCONTINUED

Total Power Solution for Micro Power Applications Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202213A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012 Typical Application 2.2μH PGND 1μF FB1 VO2 LX2 2.2μF VIN LIN VO3 VO5 PGND 1μF 1μF 3.3μH 10V 0µA - 2mA 1.8V/25mA 2.4V/5mA FB3 Boost EN3 EN2 EN1 VCORE Select 2.7V to 5.5V +1.8V Enable +2.4V Enable LDO Buck VCOREMain Aux 1.0MΩ VSEL 4.7μF SW NSR0620P2T5G AGND STAT ISET USB BAT Lithium-Ion Charger USB Input R SET Reverse Blocking HiV Enable 13MΩ 13MΩ 9MΩ 1.0MΩ 1.4MΩ 2.0MΩ 1.0MΩ FB2 DISCONTINUED

Total Power Solution for Micro Power Applications Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202213A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012 Pin Descriptions Pin # Symbol Function 1 FB1 Boost converter feedback voltage. 2 AGND System small signal ground. 3 EN2 Active high buck converter enable. 4 EN1 Active high boost converter enable input. 5 USB USB source for battery charger. Should be decoupled with 2.2µF or greater capacitor. 6 FB2 Buck converter feedback voltage. 7 BAT Battery connection. 8 ISET Battery charge current set. Programs the charge current by terminating with a resistor to ground. 9 STAT Battery charge status output. 10, 11, 12 N/C No connection. 13 VSEL Core voltage select logic input. VSEL = 0, VO5 = VO3; VSEL = 1, VO5 = VO2. 14 AGND System small signal ground. 15 EN3 Active high nano power LDO regulator enable. 16 FB3 Nano power LDO regulator feedback. 17 VO3 Nano power linear regulator output voltage. Should be decoupled with 1µF or greater output capacitor. 18 VO5 Core voltage. 19 VO2 Buck converter output voltage. 20 SW Boost switch node. 21 PGND Power ground. 22 LX2 Buck converter switch node. 23 VIN Input voltage. Should be decoupled with 2.2µF or greater capacitor. 24 LIN Boost switched power input voltage. EP EP Exposed pad; connect to ground plane. Pin Configuration QFN44-24 (Top View) FB1 AGND EN2 EN1 USB FB2 BAT ISET STAT N/C N/C N/C EN3 FB3 AGND VSEL VO3 VO5 VO2 SW PGND LX2 VIN LIN DISCONTINUED

Total Power Solution for Micro Power Applications Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202213A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012 1. Stresses abov e those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions other than the operating conditions specified is not implied. 2. Mounted on a FR4 board. Absolute Maximum Ratings1 Symbol Description Value Units VIN, BAT Input Voltage and Bias Power to PGND 6.0 V LIN Boost Inductor Source to PGND 32 USB USB Battery Charger Input 7.5 VSW SW to PGND -0.3 to 30 VLX21 LX1 to GND -0.3 to 6 VFB1 ,VFB2,VFB3 FB1, FB2, FB3 to GND -0.3 to VINB + 0.3 VSEL, EN1-EN3, STAT, ISET Logic Levels -0.3 to VINB + 0.3 TJ Operating Junction Temperature Range -40 to 150 °CTLEAD Maximum Soldering Temperature (at leads, 10 sec.) 300 Thermal Information Symbol Description Value Units PD Maximum Power Dissipation 2 W ΘJA Thermal Resistance2 50 °C/W DISCONTINUED

Total Power Solution for Micro Power Applications Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202213A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012 1. The AAT3604B is guar anteed to meet performance specification from 0°C to +70°C and is assured by design, characterization and correlation with statistical process controls.

Electrical Characteristics

TA = 0°C to 70°C, unless otherwise noted. Typical values are T A = 25°C, VIN = 3.6V. Symbol Description Conditions Min Typ Max Units VIN Input Voltage 2.7 4.5 V VO2 Output Voltage Range 0.6 VIN V IOUTMAX Maximum Output Current1 VIN = 2.7 to 4.5V @ VOUT = 1.8V 25 mA VO2 Output Voltage Tolerance IO2 = 0mA to 5mA, VIN = 2.7V to 4.5V, TA = 25°C -3.0 +3.0 % η Efficiency IO2 = 1.0mA, VO2 = 1.8V 85 % IIN Input Current VO2 = 1.8V, IOUT = 0.6mA 350 µA IQ Quiescent Current No Load 25 µA ISYSSHDN System Shutdown Current EN2 = 0V, VIN = 2.7V to 4.2V 2.0 µA ILIM P-Channel Peak Current Limit 750 mA RDS(ON)L High Side Switch On-Resistance 1 Ω RDS(ON)H Low Side Switch On-Resistance 1 Ω ∆VO2/ VO2*∆VIN Line Regulation VIN = 2.7V to 4.5V 0.1 %/V IFB2 FB Leakage Current VO2 = 1.0V 1 nA FOSC Maximum Switching Frequency 1.6 MHz TSD Over-Temperature Shutdown Threshold 140 °C THYS Over-Temperature Shutdown Hysteresis 25 °C Active High Enable Logic Input VEN2(L) Enable Threshold Low 0.4 V VEN2(H) Enable Threshold High 1.4 V IEN2 Enable Input Low Current VIN = 4.2V, VEN2 = GND 1 µA LDO Regulator TA = 0°C to 70°C, unless otherwise noted. Typical values are T A = 25°C, VIN = 3.6V, COUT = 0.1µF Symbol Description Conditions Min Typ Max Units VIN Input Voltage 2.7 4.5 V VO3 Output Voltage Range External Resistor Programmable 2.0 2.6 V ∆VOUT Output Voltage Tolerance IO3 = 0 to 100µA, VIN = 2.7V to 4.5V -3 +3 % VOUT IO3MAX Maximum Output Current VO3 = 2.0V, VIN = 3.6V 5 mA VDO Dropout Voltage1 IOUT = 100μA 17 mV ISC Short-Circuit Current VOUT < 0.4V 12 mA IQ Ground Current VIN = 2.7V to 3.6V, No Load 1.5 3.5 µA ∆VO3/∆VIN Line Regulation VIN = 2.7 to 4.5V 0.02 % ∆VO3(LOAD)/VO3 Load Regulation IO3 = 0μA to 100μA 0.05 % PSRR Power Supply Rejection Ratio 100Hz 60 dB eN Output Noise 100Hz to 100kHz @ 1mA 175 µVRMS Active High LDO Enable Input VEN3(L) Enable Threshold Low 0.4 V VEN3(H) Enable Threshold High 1.4 V IEN3 Enable Input Low Current VIN = 4.2V, VEN3 = GND 1 µA DISCONTINUED

Total Power Solution for Micro Power Applications Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202213A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012 1. The AAT3604B is guar anteed to meet performance specification from 0°C to +70°C and is assured by design, characterization and correlation with statistical process controls. Electrical Characteristics (continued) Boost Converter VIN = 3.6V, VOUT = 27V, TA = 0°C to 70°C unless otherwise noted. Typical values are at T A = 25°C. Symbol Description Conditions Min Typ Max Units Boost VIN Input Voltage Range IOUT = 0 to 200μA 2.7 4.5 V VOUT Output Voltage Adjustment Range 6 27 V VOUT Output Voltage Tolerance VIN = 2.7V to 4.5V -3 +3 % VPK Peak to Peak Output Voltage Ripple 100 mV IOUT Load Current Range VIN = 2.7V to 4.5V, VOUT = 6V to 27V 50 200 µA IOUT Load Current Range1 VIN = 2.7V to 4.5V, VOUT = 6V to 10V 2 mA IPG Fixed Peak Cycle by Cycle Inductor Current Limit 600 mA IQ Quiescent Supply Current (No Switching) VFB = 1.5V 16 µA ISHDN Shutdown Current EN1 = GND, VIN = 2.7V to 4.2V 1.0 µA RDS(ON)L NMOS On-Resistance TA = 25°C, VIN = 3.6V 0.6 Ω η Efficiency IOUT = 50μA, L = 10µH, VIN = 3.6V VOUT = 27V 73 % IOUT = 2mA, L = 3.3µH, VIN = 3.6V, VOUT = 10V 85 % ΔVOUT Load Regulation IOUT = 0 to 200μA 0.1 % ΔVOUT Line Regulation VIN = 2.7V to 4.5V 0.1 % FOSC(MAX) Typical Maximum Switching Frequency TA = 25°C, IOUT = 200µA 0.12 MHz FOSC(MIN) Typical Minimum Switching Frequency TA = 25°C, IOUT = 1µA 0.5 kHz Active High Enable Input (EN) VEN1(L) Enable Threshold Low 0.4 V VEN1(H) Enable Threshold High 1.4 V IEN1 Enable Input Low Current VIN = 4.2V, VEN5 = GND 1 µA VCORE Select VIN = 3.6V, TA = 0°C to 70°C unless otherwise noted. Typical values are at T A = 25°C. Symbol Description Conditions Min Typ Max Units VSEL Logic and Switch Characteristics RSWA Resistance from VO2 to VO5 VSEL = High 5 Ω RSWB Resistance from VO3 to V05 VSEL = Low 35 Ω IVO5 VO5 Load Current 25 mA VSELL Low Threshold 0.4 V VSELH High Threshold 1.4 V ISEL VCORE Select Logic Input Current VIN = 4.2V, VSEL= GND 1.0 µA DISCONTINUED

Total Power Solution for Micro Power Applications Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202213A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012 Electrical Characteristics (continued) Lithium-Ion Charger VUSB = 5V, TA = 0°C to 70°C unless otherwise noted. Typical values are at T A = 25°C. Symbol Description Conditions Min Typ Max Units Charger Characteristics VUSB USB Voltage Range 4.0 6.5 V VUVLO Under-Voltage Lockout (UVLO) Rising Edge 3.5 V UVLO Hysteresis 150 mV IOP Operating Current Charge Current = 25mA 0.5 mA ISHUTDOWN USB Shutdown Current VBAT = 4.25V 0.3 µA ILEAKAGE Reverse Leakage Current from BAT Pin VBAT = 4V, USB Pin Open 0.4 µA Voltage Regulation VBAT_EOC End of Charge Accuracy 4.158 4.20 4.242 V ∆VCH/VCH Output Charge Voltage Tolerance 0.5 % VMIN Preconditioning Voltage Threshold 3.0 V VRCH Battery Recharge Voltage Threshold Measured from VBAT_EOC -0.1 V Current Regulation ICH Charge Current Programmable Range 5 100 mA ∆ICH/ICH Charge Current Regulation Tolerance 10 % VSET ISET Pin Voltage 2 V KI_A Current Set Factor: ICH/ISET 120 mA/mA Charging Device RDS(ON) Charging Transistor ON Resistance VIN = 5.5V 2.5 Ω Logic Control / Protection VSTAT Output Low Voltage STAT Pin Sinks 4mA 0.4 V VOVP Battery Over-Voltage Protection Threshold 4.4 V ITK/ICHG Pre-Charge Current ISET = 25mA 10 % ITERM/ICH Charge Termination Threshold Current 10 % DISCONTINUED

Total Power Solution for Micro Power Applications Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202213A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012 Typical Characteristics – LDO Regulator LDO Load Regulation vs. Output Current (VOUT = 2.5V) Load Current (mA) Load Regulation (%) 0.01 0.11 10 -0.75 -0.5 -0.25 0.25 0.5 0.75 VBAT = 4.2V VBAT = 3.6V Dropout Voltage vs. Temperature (ILOAD = 100µA) Temperature (°C) Dropout Voltage (mV) 01 02 03 04 05 06 07 0 Output Voltage Error vs. Temperature Temperature (°C) Output Voltage Error (%) 01 02 03 04 05 06 07 0 -0.75 -0.5 -0.25 0.25 0.5 0.75 IOUT = 1µA IOUT = 10µA IOUT = 100µA Supply Current vs. Temperature Temperature (°C) Supply Current (µA) 01 02 03 04 05 06 07 0 0.25 0.5 0.75 1.25 1.5 1.75 LDO Output Voltage Noise (ILOAD = 1mA, Power BW = 100Hz to 100KHz) Frequency (Hz) Noise (µVRMS) 100 1000 10000 100000 Power Supply Rejection Ratio, PSRR Frequency (Hz) PSRR (dB) 10010 1000 10000 100000 1000000 100 DISCONTINUED

Total Power Solution for Micro Power Applications Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202213A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012 Typical Characteristics – Buck Converter Buck Efficiency vs. Load Current (VOUT = 1.8V) Load Current (mA) Efficiency (%) 0.11 10 100 100 VIN = 3.0V VIN = 3.6V VIN = 4.2V Buck Load Regulation vs. Load Current (VOUT = 1.8V) Load Current (mA) Efficiency (%) 0.11 10 100 -0.75 -0.5 -0.25 0.25 0.5 0.75 VIN = 3.0V VIN = 3.6V VIN = 4.2V Buck Efficiency vs. Load Current (VOUT = 1.2V) Load Current (mA) Efficiency (%) 0.11 10 100 100 VIN = 3.0V VIN = 3.6V VIN = 4.2V Buck Load Regulation vs. Load Current (VOUT = 1.2V) Load Current (mA) Efficiency (%) 0.11 10 100 -0.75 -0.5 -0.25 0.25 0.5 0.75 VIN = 3.0V VIN = 3.6V VIN = 4.2V Supply Current vs. Supply Voltage (Switching) Supply Voltage (V) Supply Current (µA) 24.25 24.5 24.75 25.25 25.5 25.75 Supply Current vs. Temperature (VIN = 3.6V; Switching) Temperature (°C) Supply Current (µA) 01 02 03 04 05 06 07 0 24.5 24.6 24.7 24.8 24.9 25.1 25.2 DISCONTINUED

Total Power Solution for Micro Power Applications Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202213A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012 Typical Characteristics – Buck Converter Output Voltage Error vs. Temperature Temperature (°C) Output Voltage Error (%) 01 02 0 30 40 50 60 70 -0.75 -0.5 -0.25 0.25 0.5 0.75 IOUT = 1µA IOUT = 10µA IOUT = 100µA N-Channel RDS(ON) vs. Temperature Temperature (°C) R DSON_N (Ω) 01 02 0 30 40 50 60 70 0.25 0.5 0.75 1.25 1.5 VIN = 3.0V VIN = 3.6V DISCONTINUED

Total Power Solution for Micro Power Applications Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202213A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012 Typical Characteristics – Boost Converter Boost Efficiency vs. Load Current (VOUT = 27V) Load Current (mA) Efficiency (%) 0.10 .150 .2 100 VIN = 3.0V VIN = 3.6V VIN = 4.2V Boost Load Regulation vs. Load Current (VOUT = 27V) Load Current (mA) Efficiency (%) 0.10 .150 .2 -0.2 -0.15 -0.1 -0.05 0.05 0.1 0.15 0.2 VIN = 3.0V VIN = 3.6V VIN = 4.2V Boost Efficiency vs. Load Current (VOUT = 11V) Load Current (mA) Efficiency (%) 0.01 0.11 10 100 VIN = 3.0V VIN = 3.6V VIN = 4.2V Boost Load Regulation vs. Load Current (VOUT = 11V) Load Current (mA) Efficiency (%) 0.01 0.11 10 -1.5 -0.5 0.5 1.5 VIN = 3.0V VIN = 3.6V VIN = 4.2V Output Voltage Error vs. Temperature Temperature (°C) Output Voltage Error (%) -0.75 -0.5 -0.25 0.25 0.5 0.75 01 02 03 04 05 06 07 0 Output Voltage Error vs. Input Voltage (VOUT = 27V) Supply Voltage (V) Ouput Voltage Error (%) -0.75 -0.5 -0.25 0.25 0.5 0.75 IOUT = 10µA IOUT = 100µA IOUT = 200µA DISCONTINUED

Total Power Solution for Micro Power Applications Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202213A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012 Typical Characteristics – Battery Charger Trickle Charge to Full Charge Threshold vs. Temperature Temperature (°C) Battery Voltage (V) 01 02 03 04 05 06 07 0 2.9 2.925 2.95 2.975 3.025 3.05 3.075 3.1 Trickle Charge to Full Charge Threshold vs. Supply Voltage Supply Voltage (V) Battery Voltage (V) 2.99 2.992 2.994 2.996 2.998 3.002 3.004 3.006 3.008 3.01 Charging Current vs. Supply Voltage Supply Voltage (V) Charging Current (mA) 29.2 29.6 30.4 30.8 31.2 31.6 Charging Current vs. Temperature Temperature (°C) Charging Current (mA) 01 02 03 04 05 06 07 0 29.75 29.8 29.85 29.9 29.95 30.05 End of Charge Voltage vs. Temperature Temperature (°C) Battery Voltage (V) 01 02 03 04 05 06 07 0 4.194 4.195 4.196 4.197 4.198 4.199 4.2 4.201 Recharge Voltage vs. Temperature Temperature (°C) Battery Voltage (V) 01 02 03 04 05 06 07 04.09 4.1 4.11 4.12 4.13 4.14 4.15 4.16 DISCONTINUED

Total Power Solution for Micro Power Applications Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202213A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012 Typical Characteristics – Battery Charger Constant Charging Current vs. Supply Voltage (ICH = 30mA) Supply Voltage (V) Charging Current (mA) VBAT = 3.6V VBAT = 3.9V VBAT = 4.1V End of Charge Voltage Tolerance vs. Temperature Temperature (°C) End of Charge Voltage Tolerance (%) 01 02 03 04 05 06 07 0 -0.2 -0.15 -0.1 -0.05 0.05 0.1 0.15 0.2 DISCONTINUED

Total Power Solution for Micro Power Applications Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202213A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012 Functional Block Diagram PGND FB1 FB2 LX2 VIN LIN VO3 VO5 VO2 FB3 Boost EN3 EN2 EN1 LDO Buck Main Aux VSEL SW AGND STAT ISET USB BAT Lithium-Ion Charger Reverse Blocking 13MΩ 13MΩ Functional Description The AAT3604B is a complete power management solution for small low power portable devices. It seamlessly inte- grates an intelligent, stand-alone CC/CV (Constant- Current/Constant-Voltage), linear-mode lithium-ion/ polymer battery charger with a step-up (boost) converter, a step-down (buck) converter, a low-dropout (LDO) regu- lator, and a voltage select function to switch the core volt- age for an external processor. The AAT3604B can provide charging current to the battery from a standard USB port. An internal load switch controlled by the VSEL pin allows the LDO or buck DC-DC converter to supply power to the VCORE supply pin on an external processor. Functional Description - Lithium-Ion Polymer Battery Charger The AAT3604B contains a low power battery charger designed to charge lithium-ion polymer batteries with up to 100mA of current from an external power source. It is a stand-alone charging solution, with just three external components required for complete functionality. The charger precisely regulates battery charge voltage and current for 4.2V lithium-ion polymer batteries. The adapter/USB charge input constant current level can be programmed up to 100mA for low power charging appli- cations. The charger is rated for operation from 0°C to +70°C. In the event of operating ambient temperatures exceeding the power dissipation abilities of the device DISCONTINUED

Total Power Solution for Micro Power Applications Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202213A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012 System Information Flowchart Power on Reset Power Input Voltage VIN > VUVLO Fault Co nditions Monitoring OV, OT Preconditioning Test VMIN > VBAT Current Phase Test V> VBAT BAT_EOC Voltage Phase Test IBAT > ITERM No No Yes No Preconditioning (Trickle Charge) Constant Current Charge Mode Constant Voltage Charge Mode Yes Yes Yes Charge Completed Charge Control No Recharge Test VRCH > VBAT Yes No Shutdown Yes Enable Yes No DISCONTINUED

Total Power Solution for Micro Power Applications Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202213A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012

Application Information

Constant current charge levels up to 50mA may be pro- grammed by the user when powered from a sufficient input power source. The charger will operate from the adapter input over a 4.0V to 6.5V range. The constant current fast charge current for the adapter input is set by the R SET resistor connected between I SET and ground. See Table 1 for recommended R SET values for a desired constant current charge level. USB Input Charge Inhibit and Resume The charger has a UVLO and power on reset feature so that if the input supply to the USB pin drops below the UVLO threshold, the charger will suspend charging and shut down. When power is re-applied to the USB pin or the UVLO condition recovers, the system charge control will assess the state of charge on the battery cell and will automatically resume charging in the appropriate mode for the condition of the battery. Programming Charge Current The fast charge constant current charge level is user programmed with a set resistor placed between the ISET pin and ground. The accuracy of the fast charge, as well as the preconditioning trickle charge current, is domi- nated by the tolerance of the set resistor used. For this reason, a 1% tolerance metal film resistor is recom- mended for the set resistor function. Fast charge con- stant current levels from 5mA to 100mA may be set by selecting the appropriate resistor value from Table 1. Nominal ICHARGE (mA) Set Resistor Value (kΩ) 100 2.5 85 3.0 60 4.0 50 5.11 40 6.34 30 8.45 20 12.7 10 25.5 Table 1: RSET Values vs. Charge Current. Protection Circuitry Over-Voltage Protection An over-voltage event is defined as a condition where the voltage on the BAT pin exceeds the maximum bat - tery charge voltage and is set by the over-voltage pro - tection threshold (V OVP). If an over-voltage condition occurs, the charge control will shut down the charger until voltage on the BAT pin drops below V OVP. The part will resume normal charging operation after the over- voltage condition is removed. Over-Temperature Shutdown The AAT3604B has a thermal protection control circuit which will shut down charging functions should the inter- nal die temperature exceed the preset thermal limit threshold. Once the internal die temperature falls below the thermal limit, normal operation will resume the pre- vious charging state. Charge Status Output The AAT3604B provides battery charge status via a sta - tus pin. This pin is internally connected to an N-channel open drain MOSFET, which can be used to drive and external LED. The status pin can indicate the following conditions. Event Description Status No battery charging activity OFF Battery charging via USB port Blinking 1 Second, 50% Duty Cycle Charging Completed On Table 2: LED Status Indicator. The LED should be biased with as little current as neces- sary to create reasonable illumination; therefore, a bal- last resistor should be placed between the LED cathode and the STAT pin. LED current consumption will add to the overall thermal power budget for the device pack - age, hence it is good to keep the LED drive current to a minimum. 2mA should be sufficient to drive most low cost green or red LEDs. It is not recommended to exceed 8mA for driving an individual status LED. DISCONTINUED

Total Power Solution for Micro Power Applications Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202213A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012 The required ballast resistor values can be estimated using the following formulas: (VADP - VF(LED)) ILED R1 = Example: (5.5V - 2.0V) 2mAR 1 = = 1.75kΩ Note: Red LED forward voltage (V F) is typically 2.0V @ 2mA. Capacitor Selection Input Capacitor In general, it is good design practice to place a decou- pling capacitor between the USB pin and GND. An input capacitor in the range of 2.2µF to 4.7µF is recommend - ed. If the source supply is unregulated, it may be neces- sary to increase the capacitance to keep the input volt - age above the under-voltage lockout threshold during device enable and when battery charging is initiated. If the AAT3604B's USB input is to be used in a system with an external power supply source, such as a typical AC-to-DC wall adapter, then a C IN capacitor in the range of 10µF should be used. A larger input capacitor in this application will minimize switching or power transient effects when the power supply is “hot plugged” into an adapter or USB port. Output Capacitor The AAT3604B only requires a 1µF ceramic capacitor on the BAT pin to maintain circuit stability. This value should be increased to 10µF or more if the battery connection is made any distance from the charger output. If the AAT3604B is to be used in applications where the battery can be removed from the charger, such as with desktop charging cradles, an output capacitor greater than 10µF may be required to prevent the device from cycling on and off when no battery is present. Functional Description – LDO Regulator The AAT3604B has an LDO regulator for applications where output current load requirements range from no load to 100uA. The advanced circuit design of the LDO has been optimized for minimum quiescent or ground current consumption, making it ideal for use in power management systems for small battery operated devices. The typical quiescent current level is just 1µA. The LDO also demonstrates excellent power supply ripple rejection (PSRR) and load and line transient response characteris- tics. The AAT3604B contains a truly high performance LDO regulator especially well suited for circuit applica - tions which are sensitive to load circuit power consump- tion and extended battery life. The LDO regulator output has been specifically optimized to function with low cost, low equivalent series resistance (ESR) ceramic capaci - tors. However, the design will allow for operation with a wide range of capacitor types. The LDO has complete short-circuit and thermal protection. The integral combi- nation of these two internal protection circuits give the AAT3604B a comprehensive safety system to guard against extreme adverse operating conditions. Device power dissipation is limited to the package type and thermal dissipation properties. Refer to the Thermal Considerations section of this datasheet for details on device operation at maximum output load levels. Output Voltage Programming The output voltage may be programmed through a resis- tor divider network located from the output capacitor to the FB3 pin to ground. Applications Information Input Capacitor The CIN capacitor is shared with the boost converter and buck converter. C IN should be located as close to the device VIN pin as practically possible. Typically, a 2.2µF or larger capacitor is recommended for C IN in most appli- cations. CIN values greater than 2.2µF will offer superior input line transient response and will assist in maximiz - ing the highest possible power supply ripple rejection. Ceramic, tantalum, or aluminum electrolytic capacitors may be selected for C IN. There is no specific capacitor ESR requirement for CIN. For LDO regulator output oper- ation, ceramic capacitors are recommended for C IN due to their inherent capability over tantalum capacitors to DISCONTINUED

Total Power Solution for Micro Power Applications Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202213A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012 withstand input current surges from low-impedance sources such as batteries in portable devices. Output Capacitor For proper load voltage regulation and operational stabil- ity, a capacitor is required between pins VO3 and GND. The C OUT capacitor connection to the LDO regulator ground pin should be as direct as practically possible for maximum device performance. The LDO has been spe - cifically designed to function with very low ESR ceramic capacitors. Although the AAT3604B is intended to oper - ate with low ESR capacitors, it is stable over a very wide range of capacitor ESR, thus it will also work with some higher ESR tantalum or aluminum electrolytic capacitors. However, for best performance, ceramic capacitors are recommended. The value of C OUT typically ranges from 0.47µF to 10µF; however, 1µF is sufficient for most oper- ating conditions. If large output current steps are required by an applica - tion, then an increased value for C OUT should be consid - ered. The amount of capacitance needed can be calcu - lated from the step size of the change in the output load current expected and the voltage excursion that the load can tolerate. The total output capacitance required can be calculated using the following formula: ∆VC OUT = · 15µF Where: ΔI = maximum step in output current ΔV = maximum excursion in voltage that the load can tolerate. Note that use of this equation results in capacitor values approximately two to four times the typical value needed for the LDO at room temperature. The increased capaci- tor value is recommended if tight output tolerances must be maintained over extreme operating conditions and maximum operational temperature excursions. If tanta - lum or aluminum electrolytic capacitors are used, the capacitor value should be increased to compensate for the substantial ESR inherent to these capacitor types. Capacitor Characteristics Ceramic composition capacitors are highly recommended over all other types of capacitors for use with the LDO. Ceramic capacitors offer many advantages over their tan- talum and aluminum electrolytic counterparts. A ceramic capacitor typically has very low ESR, is lower cost, has a smaller PCB footprint, and is non-polarized. Line and load transient response of the LDO regulator is improved by using low ESR ceramic capacitors. Since ceramic capaci- tors are non-polarized, they are less prone to damage if incorrectly connected. Equivalent Series Resistance ESR is a very important characteristic to consider when selecting a capacitor. ESR is the internal series resistance associated with a capacitor that includes lead resistance, internal connections, capacitor size and area, material composition, and ambient temperature. Typically, capac- itor ESR is measured in milliohms for ceramic capacitors and can range to more than several ohms for tantalum or aluminum electrolytic capacitors. Ceramic Capacitor Materials Ceramic capacitors less than 0.1µF are typically made from NPO or C0G materials. NPO and C0G materials gen- erally have tight tolerance and are very stable over tem- perature. Larger capacitor values are usually composed of X7R, X5R, Z5U, or Y5V dielectric materials. Large ceramic capacitors (i.e., greater than 2.2µF) are often available in low-cost Y5V and Z5U dielectrics. These two material types are not recommended for use with LDO regulators since the capacitor tolerance can vary by more than ±50% over the operating temperature range of the device. A 2.2µF Y5V capacitor could be reduced to 1µF over the full operating temperature range. This can cause problems for circuit operation and stability. X7R and X5R dielectrics are much more desirable. The tem - perature tolerance of X7R dielectric is better than ±15%. Capacitor area is another contributor to ESR. Capacitors, which are physically large in size will have a lower ESR when compared to a smaller sized capacitor of equiva - lent material and capacitance value. These larger devices can also improve circuit transient response when com- pared to an equal value capacitor in a smaller package size. Consult capacitor vendor datasheets carefully when selecting capacitors for use with LDO regulators. Feedback Resistor Selection Resistors R1 and R2 of Figure 2 program the output to regulate at a voltage higher than 1.0V. To limit the bias current required for the external feedback resistor string while maintaining good noise immunity, the minimum DISCONTINUED

Total Power Solution for Micro Power Applications Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202213A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012 suggested value for R6 is 1.0MΩ. VFB = 1.0V for the LDO. Although a larger value will further reduce quiescent cur- rent, it will also increase the impedance of the feedback node, making it more sensitive to external noise and interference. Table 3 summarizes the resistor values for various output voltages with R2 set to either 1.02MΩ for reduced no load input current. COUT FB3EN3 LDO AGND VIN VO3 Figure 2: LDO Regulator External Feedback. VOUT VFB R1 =- 1 · R2 VOUT R1 (Ω) R2 (Ω) 2.0V 1.00M 1.00M 2.1V 1.10M 1.00M 2.2V 1.21M 1.00M 2.3V 1.30M 1.00M 2.4V 1.40M 1.00M 2.5V 1.50M 1.00M 2.6V 1.62M 1.00M Table 3: LDO Feedback Resistor Values. No-Load Stability The LDO is designed to maintain output voltage regulation and stability under operational no load conditions. This is an important characteristic for applications where the output current may drop to zero. An output capacitor is required for stability under no-load operating conditions. Refer to the Output Capacitor section of this datasheet for recommended typical output capacitor values. Functional Description – Boost Controller The DC/DC boost controller contains an integrated slew rate controlled input disconnect MOSFET switch, and a MOSFET power switch. A high voltage rectifier, power inductor, output capacitor, and resistor divider network are required to implement a DC/DC boost converter. Control Loop The AAT3604B provides the benefits of current mode control with a simple hysteretic feedback loop. The device maintains exceptional DC regulation, transient response, and cycle-by-cycle current limit without addi - tional compensation components. The boost converter modulates the power MOSFET switching current in response to changes in output voltage. This allows the voltage loop to directly program the required inductor current in response to changes in the output load. The switching cycle initiates when the N-channel MOSFET is turned ON and current ramps up in the inductor. The ON interval is terminated when the inductor current reaches the programmed peak current level. During the OFF interval, the input current decays until the lower threshold, or zero inductor current, is reached. The lower current is equal to the peak current minus a preset hys- teresis threshold - which determines the inductor ripple current. The peak current is adjusted by the controller until the output current requirement is met. The magnitude of the feedback error signal determines the average input current. Therefore, the boost controller implements a programmed current source connected to the output capacitor and load resistor. There is no right- half plane zero, and loop stability is easily achieved with no additional compensation components. Increased load current results in a drop in the output feedback voltage (FB1) sensed through the feedback resistors (R1, R2). The controller responds by increasing the peak inductor current, resulting in higher average current in the induc- tor. Alternatively, decreased output load results in an increase in the output feedback voltage (FB1 pin). The controller responds by decreasing the peak inductor cur- rent, resulting in lower average current in the inductor. The AAT3604B uses light load mode operation to reduce switching losses and maintain high efficiency. Operating frequency varies with changes in the input voltage, output voltage, and inductor size. A small 10µH (±20%) inductor is selected to maintain high efficiency operation for 27V output at 200uA. DISCONTINUED

Total Power Solution for Micro Power Applications Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202213A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012 Output Voltage Programming The output voltage may be programmed through a resis- tor divider network located from the output capacitor to the FB1 pin to ground. The range is 6V to 27V. Soft Start / Enable The input disconnect switch is activated when a valid input voltage is present and the EN1 pin is pulled high. The slew rate control on the P-channel MOSFET ensures minimal inrush current as the output voltage is charged to the input voltage, prior to switching of the N-channel power MOSFET. Monotonic turn-on is guaranteed by the built in soft-start circuitry. Soft-start eliminates output voltage overshoot across the full input voltage range and all loading conditions. Some applications may require the output to be active when a valid input voltage is present. In these cases, tie EN1 to VIN. Current Limit and Over-Temperature Protection The switching of the N-channel MOSFET terminates when current limit of 250mA (typical) is exceeded. This mini - mizes power dissipation and component stresses under overload and short-circuit conditions. Switching resumes when the current decays below the current limit. Thermal protection disables the boost converter when internal dis- sipation becomes excessive. Thermal protection disables both MOSFETs. The junction over-temperature threshold is 140°C with 25°C of temperature hysteresis. Once an over-temperature or over-current fault condition is removed, the output voltage automatically recovers. Under-Voltage Lockout Internal bias of all circuits is controlled via the VIN input. Under-voltage lockout (UVLO) guarantees sufficient VIN bias and proper operation of all internal circuitry prior to activation. Selecting DC/DC Boost Capacitors The high output ripple inherent in the boost converter necessitates low impedance output filtering. Multi-layer ceramic (MLC) capacitors provide small size and ade- quate capacitance, low parasitic equivalent series resis- tance (ESR) and equivalent series inductance (ESL), and are well suited for use with the AAT3604B boost regula- tor. MLC capacitors of type X7R or X5R are recommend- ed to ensure good capacitance stability over the full operating temperature range. The output capacitor is sized to maintain the output load without significant volt- age droop during the power switch ON interval, when the output diode is not conducting. A ceramic output capac - itor of 2.2µF is recommended. Typically, 30V rated ceramic capacitors are required for the 27V boost out - put. Ceramic capacitors sized as small as 0603 are avail- able which meet these requirements. MLC capacitors exhibit significant capacitance reduction with applied voltage. Output ripple measurements should confirm that output voltage droop is acceptable. The boost converter input current flows during both ON and OFF switching intervals. The input ripple current is less than the output ripple and, as a result, less input capacitance is required. The C IN capacitor is shared with the LDO regulator and buck converter. A ceramic input capacitor from 2.2µF to 3.3µF is recommended. Minimum 6.3V rated ceramic capacitors are required at the input. Ceramic capacitors sized as small as 0603 are available which meet these requirements. Large capacitance tantalum or solid-electrolytic capacitors may be necessary to meet stringent output ripple and transient load requirements. These can replace (or be used in parallel with) ceramic capacitors. Both tantalum and OSCON-type capacitors are suitable due to their low ESR and excellent temperature stability (although they exhibit much higher ESR than MLC capacitors). Aluminum- electrolytic types are less suitable due to their high ESR characteristics and temperature drift. Unlike MLC capaci- tors, these types are polarized and proper orientation on input and output pins is required. 30% to 70% voltage derating is recommended for tantalum capacitors. Selecting the Output Diode To ensure minimum forward voltage drop and no recov - ery, high voltage Schottky diodes are considered the best choice for the AAT3604B boost converter. The out - put diode is sized to maintain acceptable efficiency and reasonable operating junction temperature under cycle by cycle operating conditions. Forward voltage (V F), reverse leakage and package thermal resistance (θ JA) are the dominant factors to consider in selecting a diode. The diode’s published current rating may not reflect actual operating conditions and should be used only as a comparative measure between similarly rated devices. 20V rated Schottky diodes are recommended for outputs less than 15V, while 30V rated Schottky diodes are rec - ommended for outputs greater than 15V and 40V for ouputs greater than 25V. The average diode current is equal to the output current. DISCONTINUED

Total Power Solution for Micro Power Applications Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202213A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012 IAVG = IOUT The average output current multiplied by the forward diode voltage determines the loss of the output diode. PLOSS_DIODE = IAVG · VF = IOUT · VF Diode junction temperature can be estimated. TJ = TAMB + θJA · PLOSS_DIODE The junction temperature should be maintained below 110ºC, but may vary depending on application and/or system guidelines. The diode θ JA can be minimized with additional PCB area on the cathode. PCB heatsinking the anode may degrade EMI performance. The reverse leak- age current of the rectifier must be considered to main- tain low quiescent (input) current and high efficiency under light load. The rectifier reverse current increases dramatically at high temperatures. For 27V outputs at 200uA, the Diodes, Inc. SD103BWS is recommended. For less than 20V outputs, the Diodes, Inc. SD103CWS can be used. Selecting the Boost Inductor An output inductor sized from 5.6µH to 10µH is recom - mended. The RMS current flowing through the boost inductor is equal to the DC plus AC ripple components. Under worst-case RMS conditions, the current waveform is critically continuous. The resulting RMS calculation yields worst-case inductor loss. The RMS value should be compared against the manufacturer's temperature rise, or thermal derating, guidelines. IPEAK 3IRMS = For a given inductor type, smaller inductor size leads to an increase in DCR winding resistance and, in most cases, increased thermal impedance. Winding resistance degrades boost converter efficiency and increases the inductor operating temperature. PLOSS_INDUCTOR = IRMS 2 · DCR To ensure high reliability, the inductor temperature should not exceed 100°C. Manufacturer’s recommenda - tions should be consulted. Shielded inductors provide decreased EMI and may be required in noise sensitive applications. Unshielded chip inductors provide signifi - cant space savings at a reduced cost compared to shield- ed (wound and gapped) inductors. Chip-type inductors have increased winding resistance when compared to shielded, wound varieties. The Coiltronics SD3110-3R3-R 3.3µH inductor is recommended for a 10V output, the Coilcraft LPO6610-103ML 10µH inductor is recommended for a 19V output and the Sumida CDRH2D09NP-5R6MV 5.6µH inductor is recommended for 27V output. Setting the Adjustable Output Voltage The output voltage may be programmed through a resis- tor divider network located from the output to FB pin to ground. The output voltage of the boost switching regulator OUT) is determined by the following equation: R2VOUT = VFB 1 + VOUT VFB R1 =- 1 · R2 Where VFB = 1.0V for the boost converter. FB1 VIN LIN COUT Boost SW VBOOST Figure 3: Boost Converter External Feedback. DISCONTINUED

Total Power Solution for Micro Power Applications Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202213A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012 Functional Description – Buck Converter The buck converter is a high performance 25mA mono - lithic step-down converter. It minimizes external compo- nent size, enabling the use of a tiny 0603 inductor that is only 1mm tall, and optimizes efficiency over the complete load range. Apart from the small bypass input capacitor, only a small L-C filter is required at the output. Typically, a 2.2μH inductor and a 1μF ceramic capacitor are recom- mended (see table of values). Only three external power components (C IN, COUT, and L) are required. The CIN capac- itor is shared with the boost converter and LDO regulator. Output voltage is set internally at 1.8V. At dropout, the converter duty cycle increases to 100% and the output voltage tracks the input voltage minus the R DS(ON) drop of the P-channel high-side MOSFET. The input voltage range is 2.7V to 5.5V. The converter efficiency has been opti- mized for all load conditions, ranging from no load to 5mA. The internal error amplifier and compensation pro- vides excellent transient response, load, and line regula- tion. Soft start eliminates any output voltage overshoot when the enable or the input voltage is applied. Control Loop The buck converter is a peak current mode step-down converter. The current through the P-channel MOSFET (high side) is sensed for current loop control, as well as short circuit and overload protection. A fixed slope com- pensation signal is added to the sensed current to main- tain stability for duty cycles greater than 50%. The peak current mode loop appears as a voltage-programmed current source in parallel with the output capacitor. The output of the voltage error amplifier programs the cur - rent mode loop for the necessary peak switch current to force a constant output voltage for all load and line con- ditions. Internal loop compensation terminates the transconductance voltage error amplifier output. Soft Start / Enable Soft start limits the current surge seen at the input and eliminates output voltage overshoot. When pulled low, the enable input forces the buck converter into a low- power, non-switching state. The total input current dur - ing shutdown is less than 1μA. Current Limit and Over-Temperature Protection For overload conditions, the peak input current is limit - ed. To minimize power dissipation and stresses under current limit and short-circuit conditions, switching is terminated after entering current limit for a series of pulses. Switching is terminated for seven consecutive clock cycles after a current limit has been sensed for a series of four consecutive clock cycles. Thermal protec - tion completely disables switching when internal dissipa- tion becomes excessive. The junction over-temperature threshold is 140°C with 15°C of hysteresis. Once an over-temperature or over-current fault conditions is removed, the output voltage automatically recovers. Applications Information Inductor Selection The step-down converter uses peak current mode con- trol with slope compensation to maintain stability for duty cycles greater than 50%. The output inductor value must be selected so the inductor current down slope meets the internal slope compensation requirements. Table 1 displays suggested inductor values for various output voltages. Manufacturer’s specifications list both the inductor DC current rating, which is a thermal limita- tion, and the peak current rating, which is determined by the saturation characteristics. The inductor should not show any appreciable saturation under normal load con- ditions. Some inductors may meet the peak and average current ratings yet result in excessive losses due to a high DCR. Always consider the losses associated with the DCR and its effect on the total converter efficiency when selecting an inductor. The 2.2μH LQM21P series inductor selected from Murata has a 340mW DCR and a 600mA saturation current rat - ing. At full load, the inductor DC loss is 8.5μW which gives a 0.1% loss in efficiency for a 5mA, 1.8V output. Input Capacitor Select a 2.2μF to 4.7μF X7R or X5R ceramic capacitor for the input since the C IN capacitor is shared with the boost converter and LDO regulator. DISCONTINUED

Total Power Solution for Micro Power Applications Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202213A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012 Output Capacitor The output capacitor limits the output ripple and pro- vides holdup during large load transitions. A 1μF to 2.2μF X5R or X7R ceramic capacitor typically provides sufficient bulk capacitance to stabilize the output during large load transitions and has the ESR and ESL charac - teristics necessary for low output ripple. The output voltage droop due to a load transient is domi- nated by the capacitance of the ceramic output capacitor. During a step increase in load current, the ceramic output capacitor alone supplies the load current until the loop responds. Within two or three switching cycles, the loop responds and the inductor current increases to match the load current demand. The relationship of the output volt- age droop during the three switching cycles to the output capacitance can be estimated by: COUT = 3 · ∆ILOAD VDROOP · FS Once the average inductor current increases to the DC load level, the output voltage recovers. The above equa- tion establishes a limit on the minimum value for the output capacitor with respect to load transients. The internal voltage loop compensation also limits the mini - mum output capacitor value to 1μF. This is due to its effect on the loop crossover frequency (bandwidth), phase margin, and gain margin. Increased output capac- itance will reduce the crossover frequency with greater phase margin. The maximum output capacitor RMS ripple current is given by: VOUT · (VIN(MAX) - VOUT) RMS(MAX)I L · FS · VIN(MAX) Dissipation due to the RMS current in the ceramic output capacitor ESR is typically minimal, resulting in less than a few degrees rise in hot-spot temperature. TJ(MAX) = PTOTAL · ΘJA + TAMB Setting the Adjustable Output Voltage The output voltage may be programmed through a resis- tor divider network located from the output to FB pin to ground. An external resistor divider is used to set the output voltage as shown in Figure 4. The output voltage of the buck switching regulator (V OUT) is determined by the following equation: R2VOUT = VFB 1 + VOUT VFB R1 =- 1 · R2 Where VFB = 0.6V for the buck converter. LX2EN2 2.2μH PGND COUT VIN Buck FB2 VO2 Figure 4: Buck Converter External Feedback. Functional Description – VCORE Switch An internal load switch controlled by the VSEL pin allows the LDO regulator or buck DC-DC converter to supply power to the VO5 output for a VCORE supply pin of an external processor core voltage. The load switch is for dynamic power path/sleep mode operation for ultra low power portable devices. With VSEL low, the VO3 supply is connected to VO5. When VSEL is high, the VO2 supply is connected to VO5. The maximum output current is 25mA. DISCONTINUED

Total Power Solution for Micro Power Applications Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202213A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012 1. XYY = assembly and date code. 2. Sample stock is gener ally held on part numbers listed in BOLD. 3. The leadless package family, which includes QFN, TQFN, DFN, TDFN and STDFN, has exposed copper (unplated) at the end of the lead terminals due to the manufacturing process. A solder fillet at the exposed copper edge cannot be guaranteed and is not required to ensure a proper bottom solder connection.

Ordering Information

Marking1 Part Number (Tape & Reel)2Boost Buck LDO QFN44-24 Adjustable Adjustable Adjustable S9XYY AAT3604BISK-T1 Skyworks Green™ products are compliant with all applicable legislation and are halogen-free. For additional information, refer to Skyworks Definition of Green™, document number SQ04-0074.

Package Information

4.000 ± 0.050 2.7 ± 0.05 0.300 × 45° Pin 1 Dot By Marking 4.000 ± 0.050 2.7 ± 0.05 0.5 BSC 0.4 ± 0.05 0.305 ± 0.075 0.900 ± 0.050 0.025 ± 0.025 0.214 ± 0.036 Pin 1 Identification R0.030Max 712 19 24 To p View Bottom View Side View All dimensions in millimeters. DISCONTINUED

Total Power Solution for Micro Power Applications Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202213A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012 Copyright © 2012 Skyworks Solutions, Inc. All Rights Reserved. Information in this document is provided in connection with Skyworks Solutions, Inc. (“Skyworks”) products or services. These materials, including the information contained herein, are provided by Skyworks as a service to its customers and may be used for informational purposes only by the customer. Skyworks assumes no responsibility for errors or omissions in these materials or the information contained herein. Sky - works may change its documentation, products, services, specifications or product descriptions at any time, without notice. Skyworks makes no commitment to update the materials or information and shall have no responsibility whatsoever for conflicts, incompatibilities, or other difficulties arising from any future changes. No license, whether express, implied, by estoppel or otherwise, is granted to any intellectual property rights by this document. Skyworks assumes no liability for any materials, products or information provided here- under, including the sale, distribution, reproduction or use of Skyworks products, information or materials, except as may be provided in Skyworks Terms and Conditions of Sale. THE MATERIALS, PRODUCTS AND INFORMATION ARE PROVIDED “AS IS” WITHOUT WARRANTY OF ANY KIND, WHETHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE, INCLUDING FITNESS FOR A PARTICULAR PURPOSE OR USE, MERCHANTABILITY, PERFORMANCE, QUALITY OR NON-INFRINGEMENT OF ANY INTELLECTUAL PROPERTY RIGHT; ALL SUCH WARRANTIES ARE HEREBY EXPRESSLY DISCLAIMED. SKYWORKS DOES NOT WARRANT THE ACCURACY OR COMPLETENESS OF THE INFORMATION, TEXT, GRAPHICS OR OTHER ITEMS CONTAINED WITHIN THESE MATERIALS. SKYWORKS SHALL NOT BE LIABLE FOR ANY DAMAGES, IN - CLUDING BUT NOT LIMITED TO ANY SPECIAL, INDIRECT, INCIDENTAL, STATUTORY, OR CONSEQUENTIAL DAMAGES, INCLUDING WITHOUT LIMITATION, LOST REVENUES OR LOST PROFITS THAT MAY RESULT FROM THE USE OF THE MATERIALS OR INFORMATION, WHETHER OR NOT THE RECIPIENT OF MATERIALS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. Skyworks products are not intended for use in medical, lifesaving or life-sustaining applications, or other equipment in which the failure of the Skyworks products could lead to personal injury, death, physical or en- vironmental damage. Skyworks customers using or selling Skyworks products for use in such applications do so at their own risk and agree to fully indemnify Skyworks for any damages resulting from such improper use or sale. Customers are responsible for their products and applications using Skyworks products, which may deviate from published specifications as a result of design defects, errors, or operation of products outside of pub- lished parameters or design specifications. Customers should include design and operating safeguards to minimize these and other risks. Skyworks assumes no liability for applications assistance, customer product design, or damage to any equipment resulting from the use of Skyworks products outside of stated published specifications or parameters. Skyworks, the Skyworks symbol, and “Breakthrough Simplicity” are trademarks or registered trademarks of Skyworks Solutions, Inc., in the United States and other countries. Third-party brands and names are for identification purposes only, and are the property of their respective owners. Additional information, including relevant terms and conditions, posted at www.skyworksinc.com, are incorporated by reference. DISCONTINUED