AP1603 STEP-UP DC-DC CONVERTER 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.
Pin Assignments ( Top View ) FB 1 6 SHDN GND 2 AP1603 5 OUT The PFM control circuit operating in 150kHz (max.
) switching rate results in smaller passive comp...

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