ST ISA069V1 User Manual

STEVAL-ISA069V1

3 A / 1.5 MHz step-down synchronous switching regulator based on

the ST1S31 in DFN 3x3 package

Data brief

Features

■ 4 A peak output current

■ From 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 capacitors

■ Power Good (POR)

■ Cycle-by-cycle current limiting

■ Current foldback short-circuit protection

■ RoHS compliant

Description

The STEVAL-ISA069V1 demonstration board is
based on the ST1S31, which is an internally
compensated 1.5 MHz fixed-frequency PWM
synchronous step-down regulator. This device
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 Vin.

The peak current mode control with internal
compensation delivers a very compact solution
with a minimum component count.

April 2012 Doc ID 022882 Rev 1 1/4

For further information contact your local STMicroelectronics sales office.

www.st.com

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1 Schematic diagram

Figure 1. Schematic diagram

2/4 Doc ID 022882 Rev 1