March 2008

Rev 6

1/16

16

ST1S03

1.5 A, 1.5 MHz adjustable,

step-down switching regulator

Features

DC-DC converter

limitation and power on delay of 50-100 µs

conditions

over temperature range

Description

The ST1S03 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 16 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 ST1S03 is available

in DFN6.

DFN6D (3x3mm)

Table 1.

Device summary

Order code

Packaging

Package

ST1S03PU

ST1S03PUR

DFN6D (3x3 mm)

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