ST1S32PUR Datasheet, PDF (1/29 Pages) STMicroelectronics – 4 A DC step-down switching regulator

ST1S32
4 A DC step-down switching regulator
Datasheet — production data
Features
■ 4 A DC output current
■ 2.8 V to 5.5 V input voltage
■ Output voltage adjustable from 0.8 V
■ 1.5 MHz switching frequency
■ Internal soft-start and enable
■ Integrated 60 mΩ and 45 mΩ Power MOSFETs
■ All ceramic capacitor
■ Power Good (POR)
■ Cycle-by-cycle current limiting
■ Current foldback short-circuit protection
■ VFDFPN 8 4x4x1.0 package
Applications
■ µP/ASIC/DSP/FPGA core and I/O supplies
■ Point of Load for: STB, TV, DVD
■ Optical storage, hard disk drives, printers,
audio/graphic cards
VFDFPN 8 4x4x1.0
Description
The ST1S32 is an internally compensated 1.5
MHz fixed-frequency PWM synchronous step-
down regulator. The ST1S32 operates from 2.8 V
to 5.5 V input, while it regulates an output voltage
as low as 0.8 V and up to V_IN.
The ST1S32 integrates a 60 mΩ high-side switch
and a 45 mΩ synchronous rectifier, allowing very
high efficiency with very low output voltages.
The peak current mode control with internal
compensation delivers a very compact solution
with a minimum component count.
The ST1S32 is available in 4 mm x 4 mm, 8-lead
VFDFPN package.
Figure 1. Application circuit
L
VIN
VOUT
VINSW
SW
VINA
Cin_a
R3
EN
ST1S32
R1
Cin_sw
PG
GND
VFB
Cout
R2
May 2012
This is information on a product in full production.
Doc ID 023246 Rev 1
AM12608V1
1/29
www.st.com
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