Datasheet > A5973D_08

A5973D_08

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
12页	788K
描述
Up to 2 A step down switching regulator for automotive applications

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A5973D_08 数据手册

A5973D

Up to 2 A step down switching regulator

for automotive applications

Features

■ Qualified following the AEC-Q100

requirements (temperature grade 3), see

PPAP for more details.

■ Temperature range -40 °C to +85 °C

■ 2 A DC output current

HSOP8 exposed pad

■ Operating input voltage from 4 V to 36 V

■ 3.3 V / ( 2 %) reference voltage

Description

The A5973D is a step down monolithic power

■ Output voltage adjustable from 1.235 V to 35 V

■ Low dropout operation: 100 % duty cycle

■ 250 kHz Internally fixed frequency

■ Voltage feedforward

switching regulator with a minimum switch current

limit of 2.25 A so it is able to deliver more than 2 A

DC current to the load depending on the

application conditions. The output voltage can be

set from 1.235 V to 35 V. The high current level is

also achieved thanks to an HSOP8 package with

■ Zero load current operation

exposed frame, that allows to reduce the R

down to approximately 40°C/W. The device uses

an internal P-channel DMOS transistor (with a

■ Internal current limiting

th(JA)

■ Inhibit for zero current consumption

■ Synchronization

typical R

of 250 mΩ) as switching element

DS(on)

to minimize the size of the external components.

An internal oscillator fixes the switching frequency

at 250 kHz. Having a minimum input voltage of

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

Pulse by pulse current limit with the internal

frequency modulation offers an effective constant

current short circuit protection. Pulse by pulse

current limit with the internal frequency

■ Protection against feedback disconnection

■ Thermal shutdown

Applications

■ Dedicated to automotive applications

modulation offers an effective constant current

short circuit protection.

Figure 1.

Application schematic

L1 15uH

Vout=3.3V

VIN=4V to 35V

OUT

VCC

SYNCH

COMP

A5973D

5k6

STPS340U

10uF

22nF

330uF

6.3V

35V

VREF

3.3V

CERAMIC

INH

GND

220pF

4k7

3k3

May 2008

Rev 4

1/11

www.st.com

12 3 4 5 6 7...12

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