CAT4137 datasheet(4/14 Pages) CATALYST

Part #	CAT4137

Description	CMOS Boost Converter - White LED Driver

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Manufacturer	CATALYST [Catalyst Semiconductor]

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CAT4137

Doc. No. MD-5012 Rev. B

4

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.

LED Current vs. Input Voltage (3 LEDs)

0

5

10

15

20

25

30

35

2.0

2.5

3.0

3.5

4.0

4.5

5.0

INPUT VOLTAGE [V]

Rfb = 10Ω

Rfb = 15Ω

Rfb = 20Ω

LED Current Regulation

-0.4

-0.2

0.0

0.2

0.4

2.02.5 3.03.5 4.04.5 5.0 5.5

INPUT VOLTAGE [V]

Efficiency across Supply Voltage (3 LEDs)

60

70

80

90

100

2.0

2.5

3.0

3.5

4.0

4.5

5.0

INPUT VOLTAGE [V]

20mA

15mA

Efficiency across Load Current (3 LEDs)

60

70

80

90

100

0

5

10

15

20

25

30

LED CURRENT [mA]

VIN = 3.6V

VIN = 4.2V

Efficiency across Supply Voltage (4 LEDs)

60

70

80

90

100

2.0

2.5

3.0

3.5

4.0

4.5

5.0

INPUT VOLTAGE [V]

20mA

15mA

Efficiency across Load Current (4 LEDs)

60

70

80

90

100

0

5

10

15

20

25

30

LED CURRENT [mA]

VIN = 3.6V

VIN = 4.2V

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