L5973D datasheet(1/21 Pages) STMICROELECTRONICS

部件名	L5973D

功能描述	2A switch step down switching regulator

PDF	21 Pages

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制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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1 / 21 page

January 2007

Rev 6

1/21

21

L5973AD

2A switch step down switching regulator

General features

■ 2A Internal switch

■ Operating input voltage from 4V to 36V

■ 3.3V / (±2%) reference voltage

■ Output voltage adjustable from 1.235V to 35V

■ Low dropout operation: 100% duty cycle

■ 500KHz Internally fixed frequency

■ Voltage feedforward

■ Zero load current operation

■ Internal current limiting

■ Inhibit for zero current consumption

■ Synchronization

■ Protection against feedback disconnection

■ Thermal shutdown

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

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 1.5A DC

current to the load depending on the application

conditions.

The output voltage can be set from 1.235V to 35V.

The high current level is also achieved thanks to

an SO8 package with exposed frame, that allows

to reduce the RthJA down to approximately

40°C/W.

The device uses an internal P-Channel D-MOS

transistor (with a typical of 200m

Ω) as switching

element to avoid the use of bootstrap capacitor

and guarantee high efficiency.

An internal oscillator fixes the switching frequency

at 500KHz to minimize the size of external

components.

Having a minimum input voltage of 4V only, it is

particularly suitable for 5V 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.

HSOP8 Exposed Pad

www.st.com

Test application circuit

D03IN1453

8

4

5

1

7

L5973AD

C1

10

µF

35V

CERAMIC

C2

330

µF

10V

VOUT=3.3V

VIN = 4V to 35V

R1

5.6K

R2

3.3K

R3

4.7K

C4

22nF

C3

220pF

3

L1 15

µH

D1

STPS340U

COMP

VCC

OUT

FB

GND

INH

2

6

3.3V

SYNC.

VREF

类似零件编号 - L5973D

制造商	部件名	数据表	功能描述
STMicroelectronics	L5973D	130Kb / 10P	2.5A SWITCH STEP DOWN SWITCHING REGULATOR May-2003
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	L5973D013TR	299Kb / 17P	2.5 A switch step down switching regulator 07-Jan-2008
	L5973D	299Kb / 17P	2.5 A switch step down switching regulator 07-Jan-2008

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