ST1S31 Datasheet, PDF (1/35 Pages) STMicroelectronics – All ceramic capacitor

ST1S31
3 A DC step-down switching regulator
Datasheet - production data
VFDFPN 3 x 3 - 8L
SO8
Features
 3 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 m and 45 m power MOSFETs
 All ceramic capacitor
 Power Good (POR)
 Cycle-by-cycle current limiting
 Current foldback short-circuit protection
 VFDFPN 3 x 3 - 8L, SO8 packages
Applications
 µP/ASIC/DSP/FPGA core and I/O supplies
 Point of load for: STB, TVs, DVDs
 Optical storage, hard disk drive, printers,
audio/graphic cards
Description
The ST1S31 device is an internally compensated
1.5 MHz fixed-frequency PWM synchronous step-
down regulator. The ST1S31 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 ST1S31 integrates a 60 m high-side switch
and a 45 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 ST1S31 device is available in 3 mm x 3 mm,
8 lead VFDFPN and SO8 packages.
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Figure 1. Application circuit
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March 2016
This is information on a product in full production.
DocID022998 Rev 4
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