ST1S03AIPUR datasheet(1/14 Pages) STMICROELECTRONICS

Teilenummer	ST1S03AIPUR

Bauteilbeschribung	1.5 A, 1.5 MHz adjustable, with inhibit function step-down switching regulator

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Hersteller	STMICROELECTRONICS [STMicroelectronics]

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1 / 14 page

June 2008

Rev 6

1/14

14

ST1S03A

1.5 A, 1.5 MHz adjustable, with inhibit function

step-down switching regulator

Features

■ Step-down current mode PWM (1.5 MHz) DC-

DC converter

■ 2 % DC output voltage tolerance

■ Internal soft start for start-up current limitation

and power on delay of 50-100 µs

■ Typical efficiency: > 85 %

■ Inhibit function

■ 1.5 A output current capability

■ Not switching quiescent current: max 1.5 mA

over temperature range

■ Switch VDS: max 200 mV @ ISW = 750 mA

■ Uses tiny capacitors and inductors

■ Available in DFN6D 3x3 exposed pad

Description

The ST1S03A is a step down DC-DC converter

optimized for powering low-voltage digital core in

HDD applications and, generally, to replace the

high current linear solution when the power

dissipation may cause an high heating of the

application environment. It provides up to 1.5 A

over an input voltage range of 3 V to 5.5 V. An high

switching frequency (1.5 MHz) allows the use of

tiny surface-mount components: as well as the

resistor divider to set the output voltage value,

only an inductor, a schottky diode and two

capacitors are required. Besides, 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 thermal protected and

current limited to prevent damages due to

accidental short circuit. The ST1S03A is available

in DFN6D (3x3 mm).

Table 1.

Device summary

Order codes

Packaging

Package

ST1S03APUR

Tape and reel

DFN6D (3x3 mm)

ST1S03AIPUR

Tape and reel

DFN6D (3x3 mm)

www.st.com

DFN6D (3x3 mm)

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