LTC3442 View Datasheet(PDF) - Linear Integrated System

Part Name

Description

MFG CO.

LTC3442

Micropower Synchronous Buck-Boost DC/DC Converter with Automatic Burst Mode Operation

Linear Integrated System 

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TYPICAL APPLICATIO S

High Efficiency Li-Ion Powered Constant Current LED Driver

with Open-LED Protection

VIN

2.5V TO

4.2V

10µF

R5

7.87k

OFF ON

3.3µH

SW1

SW2

VIN

VOUT

LTC3442

SD/SS

FB

RLIM

VC

RT

SGND

R4

2k

57.6k

BURST

PGND

VOUT

1nF

R2

200k

4.7µF

R3

95.3k

47pF R1

301k

ILED = 500mA

LHXL-PW03

OPEN LED VOLTAGE LIMIT = (R4+R5)*0.95/R4

R2 = R1/1.5

ILED = 24 • (R1+R2+R3)/(R1 • R3) AMPS

3442 TA04a

LTC3442

LED Driver Efficiency

vs LED Current

100

VIN = 3.6V

98 750kHz

96

94

92

90

88

86

84

82

80

0.1

LED CURRENT (A)

1.0

3442 TA04b

3442f

17

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