Datasheet > ST1S12XX18

ST1S12XX18

更新时间： 2024-11-23 04:02:31

品牌	Logo	应用领域
意法半导体 - STMICROELECTRONICS		稳压器开关
页数	文件大小	规格书
20页	339K
描述
Synchronous rectification with enable, 0.7 A, 1.7 MHz fixed or adjustable step-down switching regulator in TSOT23-5L

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ST1S12XX18 数据手册

ST1S12xx

Synchronous rectification with enable, 0.7 A, 1.7 MHz fixed or

adjustable step-down switching regulator in TSOT23-5L

Features

■ Step-down current mode PWM (1.7 MHz) DC-

DC converter

■ 3% DC output voltage tolerance

■ Synchronous rectification

■ Fixed output voltage 1.2 V, 1.8 V, and ADJ

(available on request 1.5 V, 2.5 V and 3.3 V)

TSOT23-5L

■ Enable function

■ Internal soft start

■ Typical efficiency: > 90%

■ 0.7 A output current capability

required. Moreover, 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 current is limited to prevent damage due to

accidental short-circuit. The ST1S12Gxx is

available in the TSOT23-5L package.

■ Not switching quiescent current: max 600 µA

over temperature range

■ R

typ. 250 mΩ and 400 mΩ

DSON

■ Uses tiny capacitors and inductors

■ Operative junction temp. -40°C to 125°C

■ Available in TSOT23-5L package

Description

The ST1S12Gxx is a step down DC-DC converter

optimized for powering low-voltage digital cores in

HDD applications and, generally, to replace the

high current linear solution when the power

dissipation may cause high heating of the

application environment. It provides up to 0.7 A

over an input voltage range of 2.5 V to 5.5 V. A

high switching frequency (1.7 MHz) allows the

use of tiny surface-mount components. In addition

to the resistor divider to set the output voltage

value, only an inductor and two capacitors are

Table 1.

Device summary

Part numbers

Order codes

Package

ST1S12XX

ST1S12XX12

ST1S12XX18

ST1S12GR

ST1S12G12R

ST1S12G18R ⁽¹⁾

TSOT23-5L

1. Available on request.

February 2008

Rev 2

1/20

www.st.com

12 3 4 5 6 7...20

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