L4976D013TR

更新时间： 2024-09-15 03:05:47

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	257K
描述
1A step down switching regulator

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L4976D013TR 数据手册

L4976

1A step down switching regulator

Features

■ Up to 1A step down converter

■ Operating input voltage from 8v to 55v

■ Precise 5.1V reference voltage

■ Output voltage adjustable from 0.5V to 50V

■ Switching frequency adjustable up to 300kHz

■ Voltage feedforward

DIP8

SO16W

Description

The L4976 is a step down monolithic power

switching regulator delivering 1A at a voltage

between 3.3V and 50V (selected by a simple

external divider). Realized in BCD mixed

technology, the device uses an internal power D-

■ Zero load current operation

■ Internal current limiting (pulse-bypulse

■ and hiccup mode)

■ Protection against feedback disconnection

■ Thermal shutdown

MOS transistor (with a typical R

of 0.25Ω) to

ds(ON)

obtain very high efficency and high switching

speed. A switching frequency up to 300KHz is

achievable (the maximum power dissipation of the

packages must be observed). A wide input

voltage range between 8V to 55V and output

voltages regulated from 3.3V to 40V cover the

majority of today’s applications. Features of this

new generations of DC-DC converter include

pulse-by-pulse current limit, hiccup mode for short

circuit protection, voltage feedforward regulation,

protection against feedback loop disconnection

and thermal shutdown. The device is available in

plastic dual in line, MINIDIP 8 for standard

assembly, and SO16W for SMD assembly.

Figure 1. Typical application circuit

Vi=8V to 55V

R₁

20K

L4976

C₁

220µF

63V

C₇

220nF

C₂

2.7nF

260µH

(77120)

V_O=3.3V/1A

C₆

100nF

R₂

9.1K

SB360

C₈

330µF

C₄

22nF

April 2007

Rev 7

1/17

www.st.com

12 3 4 5 6 7...17

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L4976D013TR 替代型号

型号	品牌	替代类型	描述	数据表
L4976D	STMICROELECTRONICS	类似代替	1A STEP DOWN SWITCHING REGULATOR

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L4978D013TR	STMICROELECTRONICS	获取价格	2A STEP DOWN SWITCHING REGULATOR
L4979D	STMICROELECTRONICS	获取价格	LOW DROP VOLTAGE REGULATOR
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L4979D013TR	STMICROELECTRONICS	获取价格	LOW DROP VOLTAGE REGULATOR