AP1603

AP1603 STEP-UP DC/DC CONVERTER Features • • • • • • • 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) General Description 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. Applications • • • • • • Pagers Cameras Wireless Microphones Pocket Organizers Battery Backup Suppliers Portable Instruments Ordering Information A P1603 X X X Package W : SOT26 Lead-Free L : Lead-Free (Note 2) Packing - 7 : Taping Note: 1. RoHS revision 13.2.2003. Glass and High Temperature Solder Exemptions Applied, see EU Directive Annex Notes 5 and 7. Device Lead-free Package Code W Packaging (Note 2) SOT26 7” Tape and Reel Quantity Part Number Suffix 3000/Tape & Reel -7 AP1603W 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. AP1603 Rev. 1 1 of 8 www.diodes.com NOVEMBER 2006 © Diodes Incorporated AP1603 STEP-UP DC/DC CONVERTER Pin Assignments Pin Descriptions FB 1 GND 2 REF 3 SOT26 AP1603 6 SHDN 5 OUT 7 LX 4 Name FB Feedback Description GND Ground 1.2V Reference Voltage. Bypass with a REF 0.1µF capacitor. N-Channel and P-Channel Power MOSFET LX Drain Power Output. OUT provides bootstrap OUT power to the IC. Shutdown Input. Drive high (>80% of VOUT) for operating mode. Drive low (