ST1S40IPUR Datasheet, PDF (1/30 Pages) STMicroelectronics – 3 A DC step-down switching regulator

ST1S40
3 A DC step-down switching regulator
Features
■ 3 A DC output current
■ 4.0 V to 18 V input voltage
■ Output voltage adjustable from 0.8 V
■ 850 kHz switching frequency
■ Internal soft-start
■ Integrated 95 mΩ and 69 mΩ Power MOSFETs
■ All ceramic capacitor
■ Enable
■ Cycle-by-cycle current limiting
■ Current fold back short-circuit protection
■ VFQFPN4x4-8L, HSOP-8, and SO-8 and
packages
Applications
■ μP/ASIC/DSP/FPGA core and I/O supplies
■ Point of load for: STB, TVs, DVD
■ Optical storage, hard disk drive, printers,
audio/graphic cards
Figure 1. Application circuit
SO8
VFQFPN 4x4
Description
The ST1S40 is an internally compensated 850
kHz fixed-frequency PWM synchronous step-
down regulator. ST1S40 operates from 4.0 V to
18 V input, while it regulates an output voltage as
low as 0.8 V and up to V_IN.
The ST1S40 integrates a 95 mΩ high side switch
and 69 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 ST1S40 is available in VFQFPN 4 mm x 4
mm 8 lead package, HSOP-8 and standard SO-8.
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March 2012
Doc ID 17928 Rev 4
1/30
www.st.com
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