AN4086 Datasheet, PDF (1/11 Pages) STMicroelectronics – Buck voltage regulator using the PM8903

AN4086
Application note
Buck voltage regulator using the PM8903
By David Toland
Introduction
The PM8903 is a compact, high-efficiency, monolithic step-down switching voltage regulator
which can deliver up to 3 A of continuous current. The IC minimizes external components
and board space by incorporating low-resistance MOSFETs into the IC. It is used in
applications including CPU, DSP and FPGA power supplies, distributed power supplies, and
for general DC/DC converters. The following features are incorporated:
■ Input voltage range of 2.8 V to 6 V
■ Adjustable output voltage to as low as 0.6 V
■ PSKIP mode for optimizing efficiency at light load
■ Undervoltage, overvoltage, overcurrent, and overtemperature protection
■ Power Good output
■ 1.1 MHz switching frequency which enables the use of a small inductor
■ Low quiescent current when shut down (<15 µA)
■ Interleaving synchronization (up to two ICs)
■ Small VFQFPN16, 3x3 mm package
June 2012
Doc ID 023053 Rev 1
1/11
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