B5973DTR

更新时间： 2024-11-25 13:05:47

品牌	Logo	应用领域
意法半导体 - STMICROELECTRONICS		稳压器开关式稳压器或控制器电源电路开关式控制器光电二极管
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12页	782K
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B5973DTR 数据手册

B5973D

2 A step down switching regulator

for automotive applications

Features

■ Qualified following the AEC-Q100

requirements (temperature Grade 1), see

PPAP for more details.

■ Temperature range -40 °C to +125 °C

■ 2 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

■ 250 kHz internally fixed frequency

■ Voltage feedforward

Description

The B5973D is a step down monolithic power

switching regulator with a minimum switch current

limit of 2.25 A so it is able to deliver up to 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 SO8 package with exposed

frame, that allows to reduce the R

approximately 40 °C/W. The device uses an

internal P-channel DMOS transistor (with a typical

■ Zero load current operation

down to

th(JA)

■ Internal current limiting

■ Inhibit for zero current consumption

■ Synchronization

of 250 mΩ) as switching element to

DSon

minimize the size of the external components. An

internal oscillator fixes the switching frequency at

250 kHz. Having a minimum input voltage of 4V

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 modulation offers

an effective constant current short circuit

protection.

■ Protection against feedback disconnection

■ Thermal shutdown

Applications

■ Dedicated to automotive applications

Figure 1.

Typical application

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

January 2008

Rev 2

1/11

www.st.com

12 3 4 5 6 7...12

中文翻译

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