LT3971 datasheet(21/24 Pages) LINER

Part #	LT3971

Description	38V, 1.2A, 2MHz Step-Down Regulator with 2.8 Quiescent Current

PDF	24 Pages

Scroll/Zoom	100%

Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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21 / 24 page

LT3971

3971f

TYPICAL APPLICATIONS

5V, 2MHz Step-Down Converter with Soft-Start

10pF

VIN

9V TO 25V

VOUT

1.2A

2.2μF

0.47μF

22μF

309k

11k

f = 2MHz

2.2μH

GND

SYNC

OFF ON

LT3971

3971 TA08

BOOST

1nF

4V Step-Down Converter with a High Impedance Input Source

10pF

VIN

24V

VOUT

1.2A*

4.7μF

CBULK

100μF

0.47μF

100μF

412k

49.9k

f = 800kHz

4.7μH

GND

SYNC

11M

LT3971

3971 TA09a

BOOST

1nF

–

* AVERAGE OUTPUT POWER CANNOT

EXCEED THAT WHICH CAN BE PROVIDED

BY HIGH IMPEDANCE SOURCE.

NAMELY,

WHERE V IS VOLTAGE OF SOURCE, R IS

INTERNAL SOURCE IMPEDANCE, AND N IS

LT3971 EFFICIENCY. MAXIMUM OUTPUT

CURRENT OF 1.2A CAN BE SUPPLIED FOR A

SHORT TIME BASED ON THE ENERGY

WHICH CAN BE SOURCED BY THE BULK

INPUT CAPACITANCE.

POUT(MAX) =

•

500μs/DIV

3971 TA09b

VIN

5V/DIV

VOUT

200mV/DIV

1A/DIV

Sourcing a Maximum Load Pulse

Start-Up from High Impedance Input Source

2ms/DIV

3971 TA09c

VIN

1V/DIV

VOUT

2V/DIV

500mA/DIV

LT3971 Datasheet(PDF) 21 Page - Linear Technology

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