A5973AD

更新时间： 2024-01-10 21:56:33

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
19页	1108K
描述
Up to 1.5 A step down switching regulator for automotive applications

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A5973AD 数据手册

A5973AD

Up to 1.5 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

■ 1.5 A DC output current

HSOP8 exposed pad

■ 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 A5973AD is a step down monolithic power

switching regulator with a minimum switch current

limit of 1.8 A so it is able to deliver more than

1.5 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

exposed frame, that allows to reduce the R

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

an internal P-channel D-MOS transistor (with a

■ Zero load current operation

th(JA)

■ Internal current limiting

■ 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 500 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.

Typical application

L1 15uH

Vout=3.3V

VIN=4V to 35V

OUT

VCC

SYNCH

COMP

A5973AD

5k6

STPS340U

10uF

22nF

330uF

6.3V

35V

VREF

3.3V

CERAMIC

INH

GND

220pF

4k7

3k3

May 2008

Rev 4

1/17

www.st.com

12 3 4 5 6 7...19

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