AP1603 DIODES | Alldatasheet

Document overview

  • Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
  • PDF pages: 8

Technical content

AP1603 Rev. 1 1 of 8 NOVEMBER 2006 www.diodes.com © Diodes Incorporated Lead-free

  • A Guaranteed Start-Up from less than 0.9 V
  • High Efficiency
  • Low Quiescent Current
  • Less Number of External Components needed
  • Low Ripple and Low Noise
  • Space Saving Lead-Free Packages: SOT26
  • Lead Free Finish/RoHS Compliant for Lead Free products (Note 1) The AP1603 is a high efficiency step-up DC/DC converter for applications using as few as a single NiMH or Li-Ion battery cells. Only four external components are required to deliver a fixed output voltage of 3.3V. The AP1603 starts up from less than 0.9V input with 1mA load. Pulse Frequency Modulation scheme brings optimized performance for applications with light output loading and low input voltages. The output ripple and noise are lower compared with the circuits operating in PSM mode. The PFM control circuit operating in 150KHz (max.) switching rate results in smaller passive components. The space saving SOT26 packages make the AP1603 an ideal choice of DC/DC converter for space conscious applications, like pagers, electronic cameras, and wireless microphones.
  • Pagers
  • Cameras
  • Wireless Microphones
  • Pocket Organizers
  • Battery Backup Suppliers
  • Portable Instruments A P 1 6 0 3 X X X Package Packing - 7 : TapingW : SOT26 Lead-Free L : Lead-Free (Note 2) Note: 2. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at http://www.diodes.com/datasheets/ap02001.pdf. Features General Description

Applications

Ordering Information

7” Tape and Reel Device Package Code Packaging (Note 2) Quantity Part Number Suffix AP1603W W SOT26 3000/Tape & Reel -7

AP1603 Rev. 1 2 of 8 NOVEMBER 2006 www.diodes.com © Diodes Incorporated 3 74 LX GND OUT REF SOT26 AP1603 5 SHDNFB Name Description FB Feedback GND Ground REF 1.2V Reference Voltage. Bypass with a 0.1µF capacitor. LX N-Channel and P-Channel Power MOSFET Drain OUT Power Output. OUT provides bootstrap power to the IC. SHDN Shutdown Input. Drive high (>80% of V OUT) for operating mode. Drive low (<20% of VOUT) for shutdown mode. Connect to OUT for normal operation. Block Diagram + - S QR F/F TRIG One-Shot Q One-Shot QTRIG Maximum On-Time One-Shot Error Amplifier Current-Limit Amplifier Zero Crossing Amplifier Minimum Off-Time One-Shot + - + - OUT LX GND FB REF 0.1uF 22uH 0.1uF 47uF+ 47uF SHDN P N VIN EN FB Pin Assignments Pin Descriptions

AP1603 Rev. 1 3 of 8 NOVEMBER 2006 www.diodes.com © Diodes Incorporated Absolute Maximum Ratings Symbol Parameter Rating Unit VCC Supply Voltage (OUT to GND) -0.3 to 5.5 V VREF REF to GND -0.3 to V OUT +0.3 V VSW Switch Voltage (LX to GND) -0.3 to V OUT +0.3 V IOUT Output Current (OUT) -0.8 to 0.2 A ISW Switch Current (LX) -0.8 to 0.2 A TST Storage Temperature Range -65 to +150 oC TOP Operation Temperature Range -40 to +85 oC

Electrical Characteristics

( V IN = 2V, FB = VOUT, RL = ∞, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C ) Symbol Parameter Conditions Min. Typ. Max. Unit Minimum Input Voltage - 0.9 - V VIN Operating Voltage T A = +25°C 1.1 - 5.5 V Start-Up Voltage TA = +25°C, RL = 3kΩ (Note 3) - 0.9 1.1 V Start-Up Voltage Tempco - -4 - mV/°C Output Voltage Range 2 - 5.5 V FB = VOUT = 3.3V 100 150 - IOUT Steady-State Output Current (Note 4) VIN = 2.4V, FB = GND, VOUT = 5V - 80 - mA VREF Reference Voltage I REF = 0 1.196 1.22 1.244 V TEMPCO Reference Voltage Tempco - 0.05 - mV/°C VREF_LOAD Reference Voltage Load Regulation IREF = 0 to 20 µA - 15 80 mV VREF_LINE Reference Voltage Line Regulation VIN = 1.1V to 3.6V - 0.08 1.5 mV/V RDS (ON) Internal NFET, PFET On-Resistance ILX = 100mA - 0.6 1.0 Ω ILIM LX Switch Current Limit (NFET) 0.3 0.35 0.4 A ILEAK LX Leakage Current V LX = 0, 5.5V; VOUT = 5.5V - 0.05 1 µA Operating Current into OUT V OUT = 3.3V - 16 35 µA Shutdown Current into OUT SHDN = GND - 0.1 1 µA Efficiency V OUT = 3.3V, ILOAD = 100mA - 90 - % tON LX Switch On-Time 3 4 7 µs tOFF LX Switch Off-Time 1.0 1.2 1.4 µs ISHDN SHDN Input Current VSHDN = 0 or V OUT - 0.07 50 nA VIL - - 0.2 VIH SHDN Input Voltage Based on VOUT Voltage 0.8 - - VOUT Note: 3. Start-up voltage operation is guaranteed with the addition of a Schottky 1N5819 external diode between the input and output. 4. Steady-state output current indicates that the device maintains output voltage regulation under load.

AP1603 Rev. 1 4 of 8 NOVEMBER 2006 www.diodes.com © Diodes Incorporated Typical Application Circuit (1) V OUT = 5V SHDN LX OUT REF 0.1uF 22uH 47uF 47uF +VIN ON OFF Fixed Output ( 5V ) GND 1.1V to 5.5V FB (2) VOUT = 3.3V SHDN LX OUT REF 0.1uF 22uH 47uF+ 47uF +VIN ON OFF Fixed Output ( 3.3V ) GND 1.1V to 3.6V FB (3) VOUT = Adj SHDN LX OUT REF 0.1uF 22uH 47uF 47uF +VIN ON OFF Output GND 1.1V to 5.5V FB R2 VOUT = V REF (1+ )R1

AP1603 Rev. 1 5 of 8 NOVEMBER 2006 www.diodes.com © Diodes Incorporated Typical Performance Characteristics REFERENCE VOLTAGE vs. TEMPERATURE 1.18 1.19 1.2 1.21 1.22 1.23 - 4 0 - 2 00 2 04 06 08 0 TEMPERATURE ( oC) REFERENCE VOLTAGE (V) STEADY STATE OUTPUT CURRENT vs. INPUT VOLTAGE 160 240 320 400 INPUT VOLTAGE (V) STEADY STATE OUTPUT CURRENT (mA) START-UP VOLTAGE vs. LOAD CURRENT 0.8 1.2 1.4 1.6 1.8 0 3 9 1 83 95 97 99 9 LOAD CURRENT (mA) START-UP VOLTAGE (V) with diode without diode 1N5819 NO LOAD INPUT CURRENT vs. INPUT VOLTAGE 100 125 150 175 0.89 1.2 1.4 1.6 1.8 2.2 2.4 2.6 2.8 INPUT VOLTAGE (V) NO LOAD INPUT CURRENT (uA)

AP1603 Rev. 1 6 of 8 NOVEMBER 2006 www.diodes.com © Diodes Incorporated Typical Performance Characteristics ( Continued ) EFFICIENCY vs. INPUT VOLTAGE = 1.2V 82.00 83.00 84.00 85.00 86.00 87.00 88.00 89.00 90.00 91.00 2.89 57.967.977.6 87.7 97.6 INPUT VOLTAGE = 1.2 (V) EFFICIENCY (%) EFFICIENCY vs. INPUT VOLTAGE = 2.4V 80.00 81.00 82.00 83.00 84.00 85.00 86.00 87.00 88.00 89.00 90.00 91.00 92.00 2.91 27. 57.9 87.6 117.6147 177.5 208 238 268 298 INPUT VOLTAGE = 2.4 (V) EFFICIENCY (%) SHUTDOWN CURRENT vs. SUPPLY VOLTAGE -0.8 -0.6 -0.4 -0.2 0.2 0.4 0.6 0.8 1234 SUPPLY VOLTAGE (V) SHUTDOWN CURRENT (uA) SHUTDOWN THRESHOLD VOLTAGE vs. SUPPLY VOLTAGE 0.2 0.4 0.6 0.8 1.2 1.4 1.6 1 1.5 2 2.5 3 3.5 4 SUPPLY VOLTAGE (V) SHUTDOWN THRESHOLD VOLTAGE (V)

AP1603 Rev. 1 7 of 8 NOVEMBER 2006 www.diodes.com © Diodes Incorporated Function Description General Description AP1603 PFM (Pulse Frequency Modulat ion) converter IC series combine a switch mode converter, power MOSFET, and precision voltage reference in a single monolithic device. They offer both extreme low quiescent current, high efficiency, and very low gate threshold voltage to ensure start-up with low battery voltage (0.9V typ.). Designed to maximize battery life in portable products, and minimize switching losses by only switching as needed to service the load. PFM converters transfer a discrete amount of energy per cycle and regulate the output voltage by modulating switching frequency with the constant turn-on time. Switching frequency depends on the load, input voltage, and inductor value, and it can range up to 150KHz. The SW on resistance is typically 1 to 1.5 W to minimize switch losses. When the output voltage drops, the error comparator enables 150KHz oscillator that turns on the MOSFET around 7.5us and 2.5ms off time. Turning on the MOSFET allows inductor current to ramp up, storing energy in a magnetic field and when MOSFET turns off that force inductor current through the diode to the output capacitor and load. As the stored energy is depleted, the current ramp down until the diode turns off. At this point, inductor may ring due to residual energy and stray capacitance. The output capacitor stores charge when current flow through the diode is high, and release it when the current flow is low, thereby maintaining a steady voltage across the load. As the load increases, the output capacitor discharges faster and the error comparator initiates cycles sooner, increasing the switching frequency. The maximum duty cycle ensures adequate time for energy transfer to output during the second half of each cycle. Depending on the circuit, PFM conv erter can operate in either discontinuous mode or continuous conduction mode. Continuous conduction mode means that the i nductor current does not ramp to zero during each cycle. Inductor Selection To operate as an efficient energy transfer element, the inductor must fulfill three requirements. First, the inductance must be low enough for the inductor to store adequate energy under the worst-case condition of minimum input voltage and switch ON time. Second, the inductance must also be high enough so the maximum current rating of AP1603 and inductor are not exceeded at the other worst-case condition of maximum input voltage and ON time. Lastly, the inductor must have sufficiently low DC resistance so excessive power is not lost as heat in the windings. But unfortunately this is inversely related to physical size. Minimum and Maximum input voltage, output voltage and output current must be established before an inductor can be selected. Capacitor Selection A poor choice for an output capacitor can result in poor efficiency and high output ripple. Ordinary al uminum electrolyzers, while inexpensive, may have unacceptably poor ESR and ESL. There is a low ESR aluminum capacitor for switch mode DC-DC converters which work much better than the general purpose unit. Tantalum capacitors provide still better performance at more expense. OS-CON capacitors have extremely low ESR in a small size. If capacitance is reduced, the output ripple will increase. Most of the input supply is supplied by the input bypass capacitor. The capacitor voltage rating should be at least 1.25 times greater than a maximum input voltage. Marking Information (1) SOT26 Part Number Package Identification Code AP1603W SOT26 EY XX : Identification code 1 2 3 XX Y M Y : Year: 0-9 M : Month: A~L

AP1603 Rev. 1 8 of 8 NOVEMBER 2006 www.diodes.com © Diodes Incorporated

Package Information

Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to any product herein. Diodes Incorporated does not assume any liability arising out of the application or use of any product described herein; neither does it convey any license under its patent rights, nor the rights of others. The user of products in such applications shall assume all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on our website, harmless against all damages. Diodes Incorporated products are not authorized for use as critical components in life support devices or systems without the expressed written approval of the President of Diodes Incorporated.