LTC3872

1

3872fa

Current Mode Boost

DC/DC Controller

boost DC/DC controller that drives an N-channel power

MOSFET and requires very few external components. The

resistor, improves efficiency and saves board space.

The LTC3872 provides excellent AC and DC load and line

regulation with ±1.5% output voltage accuracy. It incor-

porates an undervoltage lockout feature that shuts down

the device when the input voltage falls below 2.3V.

High switching frequency of 550kHz allows the use of a

small inductor. The LTC3872 is available in an 8-lead low

× 2mm

DFN package.

Transient Response

× 2mm DFN

Packages

High Efficiency 3.3V Input, 5V Output Boost Converter

APPLICATIO S

FEATURES

DESCRIPTIO

TYPICAL APPLICATIO

, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

Protected by U.S. Patents including 6498466, 6611131, 5731694.

IPRG

GND

SW

NGATE

LTC3872

3872 TA01

RUN/SS

17.4k

11k

1%

34.8k

1%

1nF

M1

D1

10

μF

100

μF

×2

1.8nF

47pF

1

μH

3.3V

5V

2A

Efficiency and Power Loss vs Load Current

LOAD CURRENT (mA)

30

90

100

10

0.001

20

10

80

50

70

60

40

1

100

1000

10000

3872 TA01b

0

10

1

0.1

0.01