L4976 datasheet(1/17 Pages) STMICROELECTRONICS

部件名	L4976

功能描述	1A step down switching regulator

PDF	17 Pages

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制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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1 / 17 page

April 2007

Rev 7

1/17

17

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

■ Zero load current operation

■ Internal current limiting (pulse-bypulse

■ and hiccup mode)

■ Protection against feedback disconnection

■ Thermal shutdown

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-

MOS transistor (with a typical Rds(ON) of 0.25Ω) to

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.

DIP8

SO16W

www.st.com

Figure 1.

Typical application circuit

5

2

8

4

1

L4976

C1

220

µF

63V

C8

330

µF

VO=3.3V/1A

Vi=8V to 55V

R1

20K

C2

2.7nF

R2

9.1K

C4

22nF

3

7

L1

260

µH

(77120)

6

D1

GI

SB360

C7

220nF

C6

100nF

类似零件编号 - L4976

制造商	部件名	数据表	功能描述
STMicroelectronics	L4976	100Kb / 11P	1A STEP DOWN SWITCHING REGULATOR May-2000
STMicroelectronics	L4976D	100Kb / 11P	1A STEP DOWN SWITCHING REGULATOR May-2000

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