CAT4237TD datasheet(5/14 Pages) CATALYST

Part #	CAT4237TD

Description	High Voltage CMOS Boost White LED Driver

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Manufacturer	CATALYST [Catalyst Semiconductor]

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

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5 / 14 page

CAT4237

5

Doc. No. 5013, Rev. A

Characteristics subject to change without notice

TYPICAL CHARACTERISTICS

VIN = 3.6V, CIN = 4.7μF, COUT = 0.22µF, L = 33µH with 8 LEDs at 20mA, TAMB = 25ºC, unless otherwise specified.

Quiescent Current vs. VIN (Not Switching)

0

20

40

60

80

100

120

140

2.7 3.0

3.3 3.6

3.9 4.2

4.5 4.8

INPUT VOLTAGE [V]

VFB =0.4V

(not switching)

Quiescent Current vs. VIN (Switching)

0.0

0.5

1.0

1.5

2.0

2.53.0

3.54.0

4.55.0

INPUT VOLTAGE [V]

FB pin voltage vs. Supply Voltage

285

290

295

300

305

310

315

2.7 3.0

3.3 3.6 3.9 4.2

4.5 4.8

INPUT VOLTAGE [V]

8LEDs at 20mA

VOUT= 26V

FB Pin Voltage vs. Output Current

285

290

295

300

305

310

315

0

5

10

15

20

25

30

OUTPUT CURRENT [mA]

8 LEDs

Switching Frequency vs. Supply Voltage

Switching Waveforms

960

980

1000

1020

1040

2.7 3.0 3.3 3.6 3.9 4.2 4.5 4.8

INPUT VOLTAGE [V]

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CAT4237TD Datasheet(PDF) 5 Page - Catalyst Semiconductor

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