L5973AD datasheet(1/21 Pages) STMICROELECTRONICS

tên linh kiện	L5973AD

Giải thích chi tiết về linh kiện	2 A switch step down switching regulator

PDF	21 Pages

Scroll/Zoom	100%

nhà sản xuất	STMICROELECTRONICS [STMicroelectronics]

Trang chủ	http://www.st.com

Logo

1 / 21 page

January 2008

Rev 9

1/21

21

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

■ 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 1.5 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,

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 200 m

Ω) 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.

HSOP8 exposed pad

Figure 1.

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

www.st.com

Số phần tương tự - L5973AD

nhà sản xuất	tên linh kiện	bảng dữ liệu	Giải thích chi tiết về linh kiện
STMicroelectronics	L5973AD	185Kb / 14P	2A SWITCH STEP DOWN SWITCHING REGULATOR Rev. 3
	L5973AD	488Kb / 21P	2A switch step down switching regulator 15-Jan-2007
	L5973ADTR	185Kb / 14P	2A SWITCH STEP DOWN SWITCHING REGULATOR Rev. 3
	L5973ADTR	488Kb / 21P	2A switch step down switching regulator 15-Jan-2007
	L5973AD	488Kb / 21P	2A switch step down switching regulator 15-Jan-2007

More results

Mô tả tương tự - L5973AD

nhà sản xuất	tên linh kiện	bảng dữ liệu	Giải thích chi tiết về linh kiện
STMicroelectronics	L5972D	173Kb / 10P	2A SWITCH STEP DOWN SWITCHING REGULATOR May-2003
STMicroelectronics	L5970AD	135Kb / 11P	1.5A SWITCH STEP DOWN SWITCHING REGULATOR Mar-2005
Anpec Electronics Corop...	APW1172	444Kb / 21P	2.5A SWITCH STEP DOWN SWITCHING REGULATOR
STMicroelectronics	L5973AD	488Kb / 21P	2A switch step down switching regulator 15-Jan-2007
	L5972D_0710	237Kb / 15P	2A switch step down switching regulator 16-Oct-2007
	L5973D	299Kb / 17P	2.5 A switch step down switching regulator 07-Jan-2008
	L5985	971Kb / 37P	2 A step-down switching regulator 16-Sep-2008
	L7980	1Mb / 44P	2 A step-down switching regulator 13-Dec-2010
	E-L5973AD	489Kb / 22P	2 A switch step down switching regulator 01-Nov-2009
	E-L293DD	298Kb / 17P	2.5 A switch step down switching regulator 07-Jan-2008

More results

L5973AD bảng dữ liệu(PDF) 1 Page - STMicroelectronics

L5973AD bảng dữ liệu(HTML) 1 Page - STMicroelectronics

Số phần tương tự - L5973AD

Mô tả tương tự - L5973AD

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21

bảng dữ liệu tải về

Link URL