CAT4137 datasheet(5/14 Pages) CATALYST

Part #	CAT4137

Description	CMOS Boost Converter - White LED Driver

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Manufacturer	CATALYST [Catalyst Semiconductor]

Direct Link	http://www.catalyst-semiconductor.com

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CAT4137

5

Doc. No. MD-5012 Rev. B

Characteristics subject to change without notice

TYPICAL CHARACTERISTICS

VIN = 3.6V, CIN = 1.0uF, COUT = 0.22µF, L = 22µH, with 3 LEDs at 20mA, TAMB=25ºC, unless otherwise specified.

FB Pin Voltage vs. Temperature

294

296

298

300

302

304

-50

-25

0

25

50

75

100

TEMPERATURE [°C]

3 LEDs at 20mA

Shutdown Voltage vs. Input Voltage

0.2

0.4

0.6

0.8

1.0

3.0

3.5

4.0

4.5

5.0

INPUT VOLTAGE [V]

25°C

85°C

-40°C

Under Voltage Lock Out vs. Temperature

1.6

1.7

1.8

1.9

2.0

2.1

2.2

-50

-25

0

255075

100

TEMPERATURE [°C]

Switching Frequency vs. Temperature

0.90

0.95

1.00

1.05

1.10

-50

-25

0

255075

100

TEMPERATURE [ºC]

20mA per LED

Switching Waveforms (3 LEDs in Series)

Switching Waveforms (2 LEDs in Series)

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