September 2010

Doc ID 17927 Rev 1

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11

ST1S30

3 A, 1.5 MHz PWM step-down switching regulator

with synchronous rectification

Features

control mode

over temperature range

Description

The ST1S30 is a step-down DC-DC converter

optimized for powering low output voltage

applications. It supplies a current in excess of 3 A

over an input voltage range from 2.7 V to 6 V.

A high PWM switching frequency (1.5 MHz)

allows the use of tiny surface-mount components.

Moreover, since the required synchronous

rectifier is integrated, the number of the external

components is reduced to minimum: a resistor

divider, an inductor and two capacitors. The

Power Good function continuously monitors the

output voltage. An open drain Power Good flag is

released when the output voltage is within

regulation. In addition, a low output ripple is

guaranteed by the current mode PWM topology

and by the use of low ESR SMD ceramic

capacitors. The device is thermally protected and

the output current limited to prevent damages due

to accidental short circuit. The ST1S30 is

available in the DFN8 (4 x 4 mm) package.

DFN8 (4 x 4 mm)

Table 1.

Device summary

Order codes

Package

Note

DFN8 (4 x 4 mm)

PG version

ST1S30IPUR

INHIBIT version

1.

Available on request.

www.st.com