Datasheet > A5970AD_0808

A5970AD_0808

更新时间： 2022-04-23 23:00:11

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
17页	731K
描述
Up to 1 A switch step down switching regulator for automotive applications

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A5970AD_0808 数据手册

A5970AD

Up to 1 A switch step down switching regulator

for automotive applications

Features

■ Qualified following the AEC-Q100

requirements (temperature grade 3), see

PPAP for more details.

■ 1 A DC output current

SO-8

■ Operating input voltage from 4 V to 36 V

■ 3.3 V / ( 2 %) reference voltage

■ Output voltage adjustable from 1.235 V to 35 V

■ Low dropout operation: 100 % duty cycle

■ 500 kHz internally fixed frequency

■ Voltage feedforward

Description

The A5970AD is a step down monolithic power

switching regulator with a switch current limit of

1.35 A so it is able to deliver more than 1 A DC

current to the load depending on the application

conditions.

■ Zero load current operation

The output voltage can be set from 1.235 V

to 35 V. The device uses an internal P-channel

■ Internal current limiting

■ Inhibit for zero current consumption

■ Synchronization

D-MOS transistor (with a typical R

DS(on)

250 mΩ) as switching element to avoid the use of

bootstrap capacitor and guarantee high efficiency.

■ Protection against feedback disconnection

■ Thermal shutdown

An internal oscillator fixes the switching frequency

at 500 kHz to minimize the size of external

components. Having a minimum input voltage of

4 V only, it is particularly suitable for 5 V bus,

available in all computer related applications.

Applications

■ Dedicated to automotive applications

Pulse by pulse current limit with the internal

frequency modulation offers an effective constant

current short circuit protection.

Figure 1.

Application schematic

L1 15uH

Vout=3.3V

VIN=4.4V to 35V

OUT

VCC

SYNCH

COMP

A5970AD

5k6

STPS340U

10uF

22nF

100uF

10V

35V

VREF

3.3V

CERAMIC

INH

GND

220pF

4k7

3k3

August 2008

Rev 2

1/16

www.st.com

12 3 4 5 6 7...17

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