AAT2215 SKYWORKS | Alldatasheet

Document overview

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  • PDF pages: 17

Technical content

Features

  •  2.4V to VOUT + 0.25V Input Voltage Range
  •  Adjustable 3.0V to 5.5V Output Voltage
  •  Internal Compensation
  •  600kHz Switching Frequency
  •  Programmable Peak NMOS Current Limit (0.6A to 4.0A)
  •  Synchronous P-Channel MOSFET ▪ True Load Disconnect in Shutdown ▪ Reverse Current Block When Enabled ▪ Start-Up Inrush Current Limit (0.75A) and Overload Current Limit (3A)
  •  Up to 95% Efficiency
  •  Active-Low Power Ready Indicator (RDY)
  •  Very Low 55μA No-Load Operating Current
  •  Less than 1μA Shutdown Current
  •  6V Output Over-Voltage Protection (OVP)
  •  Thermal Shutdown Protection (TSHDN)
  •  Short Circuit Protection
  • Low-Profile TDFN33-12 Package

Applications

  • Media Tablets
  • PCI-Express Cards
  • PCMCIA Cards
  • Modems
  • Wireless Data Cards Typical Application Figure VOUT 3.8VIN EN PGND LX FB VIN 2.4V to VOUT + 0.25V ON OFF RDY OUT RSET AGND RFB2 100kΩ RFB1 536kΩ RSET 100kΩ RRDY 100kΩ COUT 22μF CIN 10μF L1 2.2μH AAT2215

High Current Synchronous Step-Up Regulator with Programmable Current Limit Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202062A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 14, 2012 Pin Descriptions Pin Name Function 1, 2 LX Inductor switching node. LX is internally connected to the source of the internal low-side N-channel MOSFET (NMOS), and synchronous high-side P-channel MOSFET (PMOS). Externally connected to the switching side of the power inductor as shown in the Typical Application drawing. 3E N Enable input. A logic high enables the AAT2215 regulator. A logic low forces the AAT2215 into shut- down mode, placing the output into a high-impedance state (true load disconnect) and reducing the quiescent current to less than 1μA. 4I N Input supply. IN powers the analog control circuitry during start-up. Bypass IN to GND with a 10μF or greater ceramic capacitor. RDY Power ready signal (active low). RDY is an open-drain, active-low output. RDY is pulled low when the feedback voltage exceeds 95% of the target voltage. 6 AGND Analog ground. AGND is internally connected to the analog ground of the control circuitry. 7F B Feedback input. FB senses the output voltage for regulation control. For adjustable output versions, connect a resistive divider network from the output to FB to GND to set the output voltage accordingly. The FB regulation threshold is 0.6V. 8 RSET Programmable current-limit control. Connect an external resistor between RSET and AGND to set the peak NMOS current-limit threshold. The current-limit threshold may be adjusted from 0.6A to 4.0A.9 9, 10 OUT Output of step-up regulator. OUT internally connects to the synchronous high-side P-channel MOSFET. 11, 12 PGND Power ground. PGND is internally connected to the source of the low-side N-channel MOSFET. EP Exposed Pad Substrate/thermal ground. The exposed pad is internally connected to the substrate of the controller, and provides the lowest thermal impedance between the regulator and the PCB. Connect the exposed pad directly to the ground plane to reduce thermal stress. Pin Configuration TDFN33-12 (Top View) LX LX EN IN RDY AGND PGND PGND OUT OUT RSET FB

High Current Synchronous Step-Up Regulator with Programmable Current Limit Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202062A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 14, 2012 1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at co nditions other than the operating conditions specified is not implied. 2. The P-channel between LX and OUT that changes the substrate connection to control the body diode. This allows the high-side diode when the regulator is active, but allows the output to be isolated from the input during shutdown (true load disconnect). 3. Mounted on 1.6mm thick FR4 board. 4. Derate 25mW/°C above 25°C. Absolute Maximum Ratings1 Symbol Description Value Units VIN IN to PGND -0.3 to 6 V VOUT, VLX OUT, LX to PGND2 -0.3 to 6 VEN EN to AGND -0.3 to 6 VFB FB to AGND -0.3 to 6 VRDY RDY to AGND -0.3 to 6 VGND AGND to PGND -0.3 to 0.3 TJ Junction Temperature Range -40 to 150 °CTS Storage Temperature Range -65 to 150 TLEAD Maximum Soldering Temperature (at leads, 10 sec.) 300 Thermal Characteristics3 Symbol Description Value Units TDFN33-12 Thermal Impedance θJA Maximum Junction-to-Ambient Thermal Resistance 50 °C/W PD Maximum Power Dissipation4 2W Operating Characteristics Symbol Description Value Units TA Operating Ambient Temperature Range -40 to 85 °C VIN Input Voltage Range 2.4 to V OUT + 0.25 VVOUT Output Voltage Range 3.0 to 5.5

High Current Synchronous Step-Up Regulator with Programmable Current Limit Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202062A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 14, 2012

Electrical Characteristics

VIN = 3.3V, VOUT = 3.8V, AGND = PGND. TA = +25°C, unless otherwise noted. Symbol Description Conditions Min Typ Max Units VIN Input Voltage Range 2.4 VOUT + 0.25 VVIN(MIN) Minimum Start-Up Voltage 2.3 2.4 VOUT Output Voltage Range 3.0 5.5 VUVLO Input Under-Voltage Lockout V IN Rising, Hysteresis = 0.1V 1.9 2.1 2.3 IQ Supply Current with No Load No Load Current; Not Switching 55 80 μAISHDN Shutdown Current EN = GND, V IN = 5.5V 1 IFB FB Leakage Current V FB = 0 to 1.0V -0.2 +0.2 μA ΔVOUT/IOUT Load Regulation VIN = 3.3V, VOUT = 3.8V, 0 to 2.5A Load 1 %/A ΔVOUT/VIN Line Regulation V IN = 2.4V to VOUT, IOUT = 10mA 0.3 %/V VOVP OUT Over-Voltage Protection Threshold Hysteresis = 200mV 5.6 6.0 6.4 V fOSC Oscillator Frequency 480 600 720 kHz DMAX Maximum Duty Cycle 90 % tON(MIN) Minimum On-Time 80 ns RON(PMOS) High-Side P-Channel On-Resistance 70 mΩRON(NMOS) Low-Side N-Channel On-Resistance 90 ISTRT Input Start-Up PMOS Inrush Current Limit V OUT + 0.5V < VIN, RLOAD = 1Ω 0.5 0.75 A ILIM(PMOS) PMOS Linear Overload Current Limit V OUT = 0V 3.0 ILIMPK Low-Side Peak Current Limit Threshold RSET = 75kΩ, TA = 25°C 2.625 3.5 4.375 RSET = 63.4kΩ, TA = 25°C 4.0 RSET = 1000kΩ, TA = 25°C 0.6 Enable, Power Ready and Start-Up Features VEN(H) Logic Input Threshold High for EN 1.4 VVEN(L) Logic Input Threshold Low for EN 0.4 IEN EN Input Current V EN = GND or 5.5V -1.0 +1.0 μA VRDY Power Ready Threshold FB Rising, Hysteresis = 10% 95 % RRDY RDY On-Resistance V FB = 0.62V, ISINK = 10μA 2700 Ω Thermal TSD Over-Temperature Shutdown Threshold Temperature Rising 150 °CTSD(HYS) Over-Temperature Shutdown Hysteresis 15

High Current Synchronous Step-Up Regulator with Programmable Current Limit Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202062A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 14, 2012 120 150 180 210 240 270 300 330 360 25°C 85°C -40°C No Load Quiescent Current vs Input Voltage (Close Loop,VOUT = 3.8V) Input Voltage (V) Quiescent Current (μA) 105 120 135 150 165 180 -40 -15 10 35 60 85 No Load Quiescent Current vs Temperture (Close Loop,VIN = 3.3V, VOUT = 3.8V) Temperature (°C) Quiescent Current (μA) 25°C 85°C -40°C No Load Quiescent Current vs Input Voltage (Open Loop) Input Voltage (V) Quiescent Current (μA) -40 -15 10 35 60 85 No Load Quiescent Current vs Temperature (Open Loop, VIN = 3.3V) Temperature (°C) Quiescent Current (μA) 500 520 540 560 580 600 620 640 -40 -15 10 35 60 85 Frequency vs Temperature Temperature (°C) Frequency (Khz) 0.6 0.7 0.8 0.9 1.0 1.1 1.2 VENH VENL Enable Threshold vs Input Voltage Input voltage (V) VEN (V)

High Current Synchronous Step-Up Regulator with Programmable Current Limit Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202062A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 14, 2012 0.6 0.7 0.8 0.9 1.0 1.1 1.2 -40 -15 10 35 60 85 VENH VENL Enable Threshold vs Temperature Temperature (°C) VEN (V) 0.591 0.594 0.597 0.600 0.603 0.606 0.609 Feedback Voltage vs Input Voltage Input Voltage (V) VFB (V) 0.591 0.594 0.597 0.600 0.603 0.606 0.609 -40 -15 10 35 60 85 Feedback Voltage vs Temperature Temperature (°C) VFB (V) 100 VIN = 2.4V VIN = 2.7V VIN = 3.0V VIN = 3.3V Efficiency (L = 2.2μH, VOUT = 3.8V) Output Current (mA) Efficiency (%) 100 VIN = 2.4V VIN = 2.7V VIN = 3.0V VIN = 3.3V VIN = 4.2V Efficiency (L = 2.2μH, VOUT = 5.0V) Output Current (mA) Efficiency (%) -0.3 -0.1 0.1 0.3 0.5 0.7 0.9 VIN = 2.4V VIN = 2.7V VIN = 3.0V VIN = 3.3V VIN = 4.2V Load Regulation (L = 2.2μH, VOUT = 5.0V) Output Current (mA) Output Error (%)

High Current Synchronous Step-Up Regulator with Programmable Current Limit Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202062A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 14, 2012 -0.6 -0.4 -0.2 0.0 0.2 0.4 0.6 VIN = 2.4V VIN = 2.7V VIN = 3.0V VIN = 3.3V Load Regulation (L = 2.2μH, VOUT = 3.8V) Output Current (mA) Output Error (%) -0.5 -0.4 -0.3 -0.2 -0.1 0.0 0.1 0.2 0.3 0.4 0.5 IOUT = 1mA IOUT = 100mA IOUT = 500mA IOUT = 1000mA IOUT = 1500mA Line Regulation (L = 2.2μH, VOUT = 3.8V) Input Voltage (V) Output Error (%) Soft Start (VOUT = 3.8V; VIN = 3.3V; IOUT = 0A) Time (100μs/div) IIN (0.5A/div) VEN (1V/div) V (1V/div) VOUT Output Voltage Ripple (VIN = 3.3V; VOUT = 3.8V; l = 2.2μH; IOUT = 0mA) Time (400μs/div) IL (0.5A/div) VOUT (AC) (20mV/div) Output Voltage Ripple (VIN = 3.3V; VOUT = 3.8V; L = 2.2μH; IOUT = 1A) Time (800ns/div) IL (0.5A/div) VOUT (AC) (20mV/div) Output Voltage Ripple (VIN = 3.3V; VOUT = 3.8V; L = 2.2μH; IOUT = 2.5A) Time (800ns/div) IL (1.0A/div) VOUT (AC) (100mV/div)

High Current Synchronous Step-Up Regulator with Programmable Current Limit Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202062A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 14, 2012 100mA Load Transient (VOUT = 3.8V; VIN = 3.3V; IOUT = 100mA to 1.2A; L = 2.2μH; COUT = 22μF + 220μF) Time (400μs/div) VOUT (AC) (200mV/div) IOUT (0.5A/div) 100mA 2.5A Load Transient (VOUT = 3.8V; VIN = 3.3V; L = 2.2μH; IOUT = 100mA to 2.5A; COUT = 22μF + 220μF) Time (400μs/div) VOUT (AC) (500mV/div) IOUT (1A/div) 2.7V 3.3V Line Transient Response (VIN = 2.7V to 3.3V; VOUT = 3.8V; L = 2.2μH; IOUT = 100mA; COUT= 22μF) Time (400μs/div) (0.6V/div) VOUT (AC) VIN (100mV/div)

High Current Synchronous Step-Up Regulator with Programmable Current Limit Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202062A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 14, 2012 Functional Block Diagram OUT PGND EN FB LX IN DH DL 0.6V Slope Compensation PMOS Current Control Mode Control OVP Control Logic Reverse Current Block When Enabled True Load Disconnect Internal Power Select AGND RDY Comp Error Amp. RSET NMOS PMOS Over-Temperature Protection 0.575V UVLO 6.0V OUT NMOS Current Control

High Current Synchronous Step-Up Regulator with Programmable Current Limit Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202062A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 14, 2012 Functional Description The AAT2215 synchronous step-up converter is targeted for PC Card GSM/GPRS/3G and WiMax modem card applications. It includes a 0.75A start-up PMOS current limit to ensure fast, controlled power-up, a 3A overload PMOS current limit after startup, and a programmable peak NMOS step-up current limit up to 4A for continuous step-up operation within the PCMCIA specifications. The 600kHz switching frequency of the AAT2215 facili- tates output filter component size reduction for improved power density and reduced overall footprint. It also pro- vides greater bandwidth and improved transient response over other lower frequency step-up converters. The compensation and feedback is integrated with only three external components (C IN, COUT, L). Low R DS(ON) synchro- nous power switches provide high efficiency for heavy load conditions. Switching frequency modulation and low quiescent current maintains this high efficiency for light load mode condition. In addition to the improved effi- ciency, the synchronous step-up has the added perfor- mance advantage of true load disconnect during shut- down (<1μA shutdown current), reverse current block- ing when enabled, inrush current limit, and short-circuit protection. PWM Control Scheme with Low-Noise Light-Load The AAT2215 is a fixed-frequency PWM peak current mode control step-up converter. For light load condition (70mA to 80mA and below), the converter stays in a variable frequency (Light Load) mode to reduce the dominant switching losses. In addition to Light Load operation, a zero current comparator blocks reverse cur- rent in the P-channel synchronous MOSFET, forcing DCM operation at light load. These controls, along with very low quiescent current, help to maintain high efficiency over the complete load range without increased output voltage ripple during light load conditions. Shutdown and True Load Disconnect A typical synchronous step-up (step-up) converter has a conduction path from the input to the output via the parasitic body diode of the P-channel MOSFET when the converter shuts down. The AAT2215 design a special power selection for the substrate to keep the parasitic body diode in off-state during shutdown and startup. This enables the AAT2215 to provide true load disconnect dur- ing shutdown and PMOS inrush current limit at startup. During the initial PMOS linear mode start-up period, the start-up control circuitry is powered by the input supply pin. When the output voltage of the AAT2215 enters step-up mode (V IN ≈ VOUT), the step-up control circuitry draws power directly from the output supply to ensure sufficient voltage head-room. When EN is set to logic low, the step-up converter is forced into shutdown state with less than 1μA input cur- rent. Soft-start and PMOS Current Limit Protection Start-Up Inrush Current Protection When initially powering up, the load disconnect feature allows the output voltage to be less than the input volt- age. In order to avoid large surge current when the regulator is enabled, the AAT2215 operates the synchro- nous P-channel MOSFET in a current-limited linear mode to softly charge the large output capacitor. This linear start-up feature effectively limits the input current to 0.75A until the output voltage exceeds the input voltage. After V OUT exceeds V IN, the regulator switches the body diode connection and begins step-up operation. Overload Current-Limit Protection Once start-up is completed, (RDY is pulled low), the AAT2215 increases the PMOS overload current-limit threshold to 3A. If the output is overloaded, causing V OUT to drop below V IN by 210mV, the regulator will switch back to a linear operating mode. This activates the 3A PMOS overload current protection and the AAT2215 will reverse the body-diode connection. This effectively limits the output current under such fault conditions. Combined with the thermal shutdown protection, the PMOS current-limit protects the regulator against over- load and short-circuit fault conditions. The overload current limit is fixed at 3A, and short-circuit protection also adopts this 3A current limit; the 3A cur- rent limit is not changed with R SET value. Programmable Peak NMOS Current-Limit When the output voltage of the AAT2215 enters step-up mode (V IN < V OUT), the NMOS starts switching and the NMOS peak current-limit becomes active. During the inductor charge cycle, the low-side NMOS turns on and the AAT2215 monitors the current through the NMOS. If the current exceeds the current-limit threshold set by

High Current Synchronous Step-Up Regulator with Programmable Current Limit Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202062A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 14, 2012 the RSET resistor, the regulator immediately turns off the low-side NMOS. The regulator limits the instantaneous peak inductor/NMOS current, so the current-limit thresh- old must be set high enough to support the desired out- put current. Power Ready To indicate the output voltage is in regulation, an active- low open-drain output pin (RDY) pulls down when the feedback voltage is above 95% of the nominal regulation voltage level. RDY becomes a high-impedance output if the feedback voltage drops below 85% of the nominal regulation voltage level. Over-Voltage Protection The AAT2215’s over-voltage protection function prevents the output voltage from exceeding the fixed 6V (typ) over-voltage point, which would exceed the absolute maximum rating of the regulator. If OUT exceeds 6V, the regulator will stop switching until the output voltage drops below 5.8V (200mV hysteresis) and FB is below its regulation threshold. Thermal Shutdown When the junction temperature exceeds the over-tem- perature threshold, the AAT2215 thermal protection cir- cuitry shuts down the regulator. Thermal shutdown dis- ables switching and PMOS current limit is functional to control the current flowing through to avoid any damage of the step-up converter. When the over-temperature fault condition is removed, the step-up recovers regula- tion automatically.

Application Information

Programmable Current Limit The current limit of the internal low-side NMOS power switch is programmable from 0.6A to 4.0A by an exter- nal resistor connected from RSET to ground. When the inductor’s peak current reaches the current limit, the RDY indicator is pulled high. Table 1 gives stan- dard 1% standard metal film resistor example values for the peak NMOS current-limit programming. RSET (kΩ)I LIMIT (A) 63.4 4 75.0 3.48 82.0 3.1 100.0 2.6 118.0 2.15 150.0 1.75 180.0 1.52 300.0 1.02 432.0 0.82 1000.0 0.6 Table 1: Examples of 1% Standard Resistor Value of RSET 0.5 1.5 2.5 3.5 4.5 0 100 200 300 400 500 600 700 800 900 1000 Resistance (kΩ) ILIMIT (A) Figure 1: ILIMIT vs RSET

High Current Synchronous Step-Up Regulator with Programmable Current Limit Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202062A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 14, 2012 Output Voltage Programming The output voltage of the AAT2215 may be programmed from 3.0V to 5.5V with an external resistive voltage divider. Resistors R1 and R2 in Figure 1 program the output voltage as shown by the following equation: R1 = - 1 · R2 VOUT VREF where 0.6V is the feedback reference voltage (V REF). To limit the bias current required for the external feedback resistor string while maintaining good noise immunity, the suggested value for R2 is 100k Ω. Table 2 summa- rizes the resistor values with R2 set to 100k Ω for good noise immunity and 6 μA increased load current and gives some 1% standard metal film resistor values for R1 at different output voltage settings. VOUT(V) R2 = 100kΩ R1 = (kΩ) 3 400 3.3 450 3.6 500 3.8 536 4.2 600 4.5 650 5 733 5.5 816 Table 2: Resistor Selection for Output Voltage Inductor Selection The AAT2215 is designed to operate with a 2.2μH induc- tor for all input/output voltage combinations. For high efficiency, choose a ferrite inductor with a high frequen- cy core material to reduce core losses. The inductor should have low ESR (equivalent series resistance) to reduce the I 2R losses, and must be able to handle the peak inductor current without saturating. To minimize radiated noise, use a shielded inductor. Input Capacitor Select a low ESR ceramic capacitor with a value of at least 10μF as the input capacitor. Place the input capac- itor as close to the IN and PGND pins as possible in order to minimize the stray resistance from the converter to the input power source. Output Capacitor The output capacitor provides energy to the load when the high-side MOSFET is switched off. The output capac- itance together with the boost switching frequency, duty cycle, and load current value determine the capacitive output voltage ripple when the boost operation is in the continuous PWM state. ∆VOUT = IOUT · D COUT · fSW where D is the duty ratio of low-side MOSFET turn-on time divided by the switching period. It is calculated using the equation: D = 1 - VIN VOUT The output capacitor’s ESR increases the output ripple by IOUT · ESR. The total output ripple is: ∆VOUT = (IOUT · ESR) + IOUT · D COUT · fSW So the minimum recommended output capacitor value may be determined by: COUT ≥ · IOUT · D ∆VOUT - (IOUT · ESR) fSW

High Current Synchronous Step-Up Regulator with Programmable Current Limit Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202062A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 14, 2012 High Load Pulse Application Together with a large value output capacitor or supercap, the AAT2215 can support a higher load pulse in lower input current limited applications such as GSM burst mode in WCDMA, Edge, GPRS and TD-SCDMA applica- tions. The large capacitance is determined by NMOS peak current limit, inductor current ripple, V IN, VOUT, load pulse high current level and elapsed time. The capacitor value can be calculated using the following three steps as follows: First calculate the AAT2215's load-on current from the expected I LIM. Assume the input current equals I LIM because the inductor current ripple is low enough when compared to the input current: OUT LIMIN V IVIOUT_BOOST

  • η· Second, calculate the maximum current the large capac- itor COUT should provide: BOOSTOUTPEAKLOADCOUT III __ -= Finally, derive the COUT at a certain load-on period T ON: OUT ONCOUT OUT V TIC ∆ To consider the real tantalum capacitor having 20% tol- erance, the selected capacitance should be 20% higher than the calculated value. Example: A 2.0A, 217Hz 12.5% duty cycle load pulse is applied on 3.8V V OUT at 3.3V VIN. An input peak current limit of 2.4A and a VOUT drop of less than 450mV are required. Under these con- ditions, with 89% efficiency, the AAT2215's output cur- rent is I BOOSTOUT 1.86A 8.3 3.3·2.4·89% _ == The maximum current necessary for the large capacitor value is: AICOUT 14.01.860.2= -= TON is 577 μs for a 217Hz 12.5% duty cycle load pulse. Considering 20% capacitance tolerance, the minimum capacitance should be 220 μF. Figure 2 shows the AAT2215 operating waveform under a 2.0A 577 μs load pulse with 220μF tantalum capacitor as C OUT, as well as a 22μF ceramic capacitor to closely filter the output volt- age. 2.50 3.00 3.50 4.00 4.50 5.00 VOUT ILOAD Load Pulse Response Time (800μs/div) Output Voltage (0.5V/div) (top) Output Current (0.5A/div) (bottom) Figure 2: AAT2215 Operation Waveform When 2.0A 217Hz 577μs Load Pulse is Applied. Layout Guidance For best performance of the AAT2215, the following guidelines should be followed when designing the PCB layout: 1. Make the power trace as short and wide as possible, including the input/output power lines and switching node, etc. 2. Connect the analog and power grounds together with a single short line and connect all low current loop grounds to analog ground to decrease the power ground noise on the analog ground and achieve bet- ter load regulation. 3. For good power dissipation, connect the exposed pad under the package to the top and bottom ground planes by PCB pads.

High Current Synchronous Step-Up Regulator with Programmable Current Limit Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202062A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 14, 2012 Part Number Inductance (μH) Max DC Current (A) DCR (mΩ) Size LxWxH (mm) Type CHRH103RNP-2R2NC 2.2 6.7 20 10x10x2.8 Shielded CDRH103RNP-3R3NC 3.3 5.5 21 10x10x2.8 Shielded 7440650033 3.3 4.7 20 10x10x2.8 Shielded LQH6PPN3R3N43 3.3 4.5 16 6x6x4.3 Shielded Table 3: Surface Mount Inductors. Part Number Description Manufacturer AAT2215IWP-0.6 High Current Step-Up Converter with Adjustable Current Limit Skyworks RC0603FR-07536KL Res 536k Ω 1/10W 1% 0603 SMD YageoRC0603FR-07100KL Res 100k Ω 1/10W 1% 0603 SMD RC0603FR-07100KL Res 100k Ω 1/10W 1% 0603 SMD RC0603FR-07100KL Res 100k Ω 1/10W 1% 0603 SMD GRM21BR61C106K Cap Ceramic 10 μF 0805 X5R 16V 10% MurataGRM21BR60J226M Cap Ceramic 22 μF 0805 X5R 6.3V 20% TPSY227M006R0150 Cap Tan 220 μF case 6.3V 20% AVX CDRH103RNP-2R2NC Inductor 2.2 μH 6.7A SMD Sumida Table 4: AAT2215 Evaluation Board Bill of Materials.

High Current Synchronous Step-Up Regulator with Programmable Current Limit Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202062A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 14, 2012

Ordering Information

Package Marking 1 Part Number (Tape and Reel)2 TDFN33-12 P5XYY AAT2215IWP -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 Information3 TDFN33-12 Top View Bottom View Detail "A" Side View 3.00 ± 0.05 Index Area Detail "A" 1.70 ± 0.05 3.00 ± 0.05 0.05 ± 0.05 0.23 ± 0.05 0.75 ± 0.05 2.40 ± 0.05 Pin 1 Indicator (optional) 0.40 ± 0.05

0.1 REF

C0.3 All dimensions in millimeters. 1. XYY = assembly and date code. 2. Sample stock is generally 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 c onnection.

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