CAT4238TD-GT3 datasheet(6/12 Pages) ONSEMI

Part #	CAT4238TD-GT3

Description	High Efficiency 10 LED Boost Converter

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Manufacturer	ONSEMI [ON Semiconductor]

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TYPICAL CHARACTERISTICS

(VIN = 3.6 V, CIN = 4.7 mF, COUT = 0.22 mF, L = 47 mH with 10 LEDs at 20 mA, TAMB = 25°C, unless otherwise specified.)

Figure 10. LED Current vs. Input Voltage

Figure 11. LED Current Regulation (10 mA)

INPUT VOLTAGE (V)

5.0

4.5

4.0

3.5

3.0

0

5

10

15

20

25

30

40

5.5

5.0

4.5

4.0

3.5

3.0

−1.0

−0.5

0

0.5

1.0

Figure 12. Efficiency vs. Load Current

(10 LEDs)

Figure 13. Efficiency vs. Input Voltage

(10 LEDs)

LED CURRENT (mA)

INPUT VOLTAGE (V)

30

25

20

15

10

5

60

70

80

90

100

5.5

4.5

4.0

3.5

3.0

60

70

80

90

100

Figure 14. Power−up with 10 LEDs at 20 mA

Figure 15. Switch ON Resistance vs. Input

Voltage

INPUT VOLTAGE (V)

5.5

5.0

4.5

4.0

3.5

3.0

0

0.5

1.0

1.5

2.0

R1 = 20

W

VOUT = 32.5 V

VIN = 5 V

VIN = 3.6 V

10 LEDs @ 10 mA

5.5

35

R1 = 15

W

VOUT = 33 V

R1 = 10

W

VOUT = 33.8 V

5.0

VOUT = 32.5 V

10 LEDs @ 15 mA

VOUT = 33 V

10 LEDs @ 20 mA

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CAT4238TD-GT3 Datasheet(PDF) 6 Page - ON Semiconductor

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