CAT4137 datasheet(10/14 Pages) CATALYST

部品番号	CAT4137

部品情報	CMOS Boost Converter - White LED Driver

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メーカー	CATALYST [Catalyst Semiconductor]

ホームページ	http://www.catalyst-semiconductor.com

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10 / 14 page

CAT4137

Doc. No. MD-5012 Rev. B

10

Characteristics subject to change without notice

TYPICAL APPLICATIONS

CAT4137 Driving Two LEDs

L: Sumida CDRH3D16-330

D: Central CMDSH2-3 (rated 30V)

C2: Taiyo Yuden GMK212BJ105KG-T (rated 35V)

Efficiency vs. LED Current, Two LEDs

70

75

80

85

90

95

100

010

20

30

40

LED CURRENT [mA]

VIN = 3V

VIN = 3.6V

For best performance, a 33µH inductor and a 1µF

output capacitor are recommended for 2-LED

applications.

In 2-LED configuration, the CAT4137 can be powered

from two AA alkaline cells or from a Li-ion battery.

VIN

CAT4137

VIN

VOUT

LD

1µF

2.2V to

5.0V

C1

1µF

C2

R1

15Ω

FB

SHDN

SW

GND

ON

33µH

OFF

VFB = 300mV

20mA

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