ST1S40 Datasheet, PDF (1/29 Pages) STMicroelectronics – 3 A DC step-down switching regulator

ST1S40
3 A DC step-down switching regulator
Datasheet - production data
HSOP-8
VFQFPN 4 x 4
SO8
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 m and 69 m Power MOSFETs
 All ceramic capacitor
 Enable
 Cycle-by-cycle current limiting
 Current fold back short-circuit protection
 Available in HSOP-8, VFQFPN4x4-8L, and
SO8 packages
Applications
 P/ASIC/DSP/FPGA core and I/O supplies
 Point of load for: STB, TVs, DVD
 Optical storage, hard disk drive, printers,
audio/graphic cards
Description
The ST1S40 device is an internally compensated
850 kHz fixed-frequency PWM synchronous step-
down regulator. The 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 m high side switch
and 69 m 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 HSOP-8, VFQFPN 4
mm x 4 mm - 8 lead, and standard SO8 package.
Figure 1. Application circuit
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October 2013
This is information on a product in full production.
DocID17928 Rev 5
1/29
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