ST1S09 Datasheet

IC型號：
ST1S09
PDF描述：
2A, 1.5 MHz PWM step-down switching regulator with synchrono...
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PDF頁數(shù)：
18頁
芯片廠家：
STMICROELECTRONICS

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ST1S09

2A, 1.5 MHz PWM step-down switching regulator

with synchronous rectification

Features

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1.5MHz fixed frequency PWM with current

control mode

2A output current capability

Typical efficiency: > 90%

2% DC output voltage tolerance

Two versions available: Power Good or Inhibit

Integrated output over-voltage protection

Non switching quiescent current: (typ) 1.5mA

over temperature range

DSON

(typ) 100m惟

Utilizes tiny capacitors and inductors

Operating junction temp. -30擄C to 125擄C

Available in DFN6 3x3mm exposed pad

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 E.S.R. SMD ceramic

capacitors. The device is thermally protected and

the output current limited to prevent damages due

to accidental short circuit. The ST1S09 is

available in the DFN6 3x3mm package.

DFN6 (3x3mm)

Description

The ST1S09 is a step-down DC-DC converter

optimized for powering low output voltage

applications. It supplies a current in excess of 2A

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

A high PWM switching frequency (1.5MHz) allows

the use of tiny surface-mount components.

Table 1.

Devices summary

Order codes

ST1S09PU

ST1S09APU

(1)

ST1S09IPU

Packaging

ST1S09PUR

ST1S09APUR

ST1S09IPUR

Package

DFN6D (3x3 mm)

1. Available on request.

July 2007

Rev. 2

1/18

www.st.com

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