PM8903A Datasheet, PDF (1/33 Pages) STMicroelectronics – 3 A step-down monolithic switching regulator

PM8903A
3 A step-down monolithic switching regulator
Datasheet − production data
Features
■ Integrated 35 mΩ MOSFETs for high efficiency
■ 3 A continuous output current
■ 2.8 V to 6 V input voltage (V_IN)
■ 2.9 V to 5.5 V supply voltage (V_CC)
■ Adjustable output voltage down to 0.6 V
■ 1% output voltage accuracy
■ 1.1 MHz switching frequency operation
■ PSKIP mode to optimize light load efficiency
■ Embedded bootstrap diode
■ Thermally compensated loss-less current
sense across HS and LS MOSFETs
■ OV/UV/OC and overtemperature protection
■ Internal soft-start and soft-stop
■ Interleaving synchronization (up to 2 ICs)
■ Power Good output
■ Shutdown function (< 15 µA quiescent current)
■ VFQFPN16 3 x 3 mm compact package
Applications
■ Subsystem power supply
■ CPU, DSP and FPGA power supplies
■ Distributed power supply
■ General DC-DC converters
Description
The PM8903A is a high efficiency monolithic step-
down switching regulator designed to deliver up to
3 A continuous current. The IC operates from 2.8
V to 6 V input voltage (V_IN).
Table 1. Device summary
VFQFPN16 (3 x 3 mm)
The PM8903A features low-resistance integrated
nMOS and proprietary pulse-skipping mode for
optimum efficiency over all the loading range.
The voltage mode control loop allows the widest
range of output filters. Current sense is internally
thermally compensated for optimum precision.
The integrated 0.6 V reference allows the
regulation of output voltages with ±1% accuracy
over temperature variations. Switching frequency
is typically set to 1.1 MHz and can be
programmed to 0.8 MHz or 1.0 MHz. Out of phase
synchronization allows the reduction of input RMS
current.
The PM8903A provides precise dual-threshold
overcurrent protection as well as
over/undervoltage and overtemperature
protection. PGOOD output easily provides real-
time information on the output voltage.
The PM8903A is available in VFQFPN16 3 x 3
mm.
Order codes
Package
Packaging
PM8903A
PM8903ATR
VFQFPN16 (3 x 3 mm)
VFQFPN16 (3 x 3 mm)
Tube
Tape and reel
January 2013
This is information on a product in full production.
Doc ID 024147 Rev 1
1/33
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