Datasheet > L5973AD_08

L5973AD_08

更新时间： 2024-02-04 16:32:58

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
21页	492K
描述
2 A switch step down switching regulator

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中文翻译

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L5973AD_08 数据手册

L5973AD

2 A switch step down switching regulator

Features

■ 2 A Internal switch

■ 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

HSOP8 exposed pad

Description

The L5973AD is a step down monolithic power

switching regulator with a switch current limit of

2A 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 SO8 package with exposed frame,

■ Zero load current operation

■ Internal current limiting

■ Inhibit for zero current consumption

■ Synchronization

■ Protection against feedback disconnection

■ Thermal shutdown

that allows to reduce the R

approximately 40 °C/W.

down to

thJA

The device uses an internal P-Channel D-MOS

transistor (with a typical of 200 mΩ) as switching

element to avoid the use of bootstrap capacitor

and guarantee high efficiency.

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.

Pulse by pulse current limit with the internal

frequency modulation offers an effective constant

current short circuit protection.

Applications

■ Consumer: STB, DVD, TV, VCR, car radio,

LCD monitors

■ Networking: XDSL, modems, DC-DC modules

■ Computer: printers, audio/graphic cards,

optical storage, hard disk drive

■ Industrial: chargers, car battery, DC-DC

converters

Figure 1. Test application circuit

VREF

L1 15µH

3.3V

VOUT=3.3V

OUT

VIN = 4V to 35V

VCC

STPS340U

5.6K

L5973AD

SYNC.

COMP

330µF

10V

10µF

35V

22nF

INH

GND

CERAMIC

3.3K

220pF

4.7K

D03IN1453

January 2008

Rev 9

1/21

www.st.com

12 3 4 5 6 7...21

中文翻译

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