LT3973 View Datasheet(PDF) - Linear Technology

Part Name

Description

MFG CO.

LT3973

42V, 750mA Step-Down Regulator with 2.5µA Quiescent Current and Integrated Diodes

Linear Technology 

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LT3973/LT3973-3.3/LT3973-5

TYPICAL APPLICATIONS

5V Step-Down Converter with Undervoltage Lockout

kΩ

+

–

VIN

6V TO 42V

3.9M

976k

4.7µF

VIN BOOST

LT3973

EN/UVLO SW

PG

BD

RT

FB

215k

GND OUT

f = 600kHz

0.47µF

15µH

15pF 1M

316k

VOUT

5V

750mA

22µF

3973 TA10a

Input Current During Start-Up

60

50

INPUT CURRENT

DROPOUT

40

CONDITIONS

30

FRONT PAGE

APPLICATION

20

FRONT PAGE

APPLICATION

WITH UVLO

10

PROGRAMMED

TO 6V

0

–10

0

2

4

6

8 10 12

INPUT VOLTAGE (V)

3973 TA10b

Start-Up from High Impedance Input Source

UVLO PROGRAMMED TO 6V

VIN

5V/DIV

VOUT

2V/DIV

5ms/DIV

FRONT PAGE APPLICATION

VIN = 12V

VOUT = 5V

1k INPUT SOURCE RESISTANCE

2.5mA LOAD

3973 TA10c

20

For more information www.linear.com/LT3973

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