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LX1745CPW

Triple Output Boost – LED Driver / LCD Bias

Microsemi Corporation 

LX1745

TM

®

Triple Output Boost – LED Driver / LCD Bias

PRODUCTION DATASHEET

VOUT VERSUS VADJ

30

25

20

15

10

5

0

0

0.5

1

1.5

2

Adjustment Signal Voltage (VADJx)

Figure 12 – Output Voltage Vs. Adjustment Signal Threshold

Note: The LX1745 uses the internal voltage reference

until the VADJ signal exceeds 0.5V (typ).

WAVEFORM

Figure 14 – Typical Switching Waveform

CH1 – SWx Voltage, CH2 – Output Voltage, CH3 – Inductor Current

VIN = 3.6V, VOUT = 18V, IOUT = 9mA

GATE DRIVE

6

5

4

3

2

1

0

0 20 40 60 80 100 120 140 160

DRV Current (mA)

Figure 13 – Gate Drive Voltage Vs. Drive Current

VIN = 5V, TA = 25°C

EFFICIENCY

90%

85%

80%

75%

70%

65%

60%

55%

50%

0

5

10

15

20

25

Output Current (mA)

Figure 15 – LED Driver (Upper) and LCD Bias Efficiency

VIN = 5V, Four LEDs, L = 47μH, RCS = 4kΩ

VIN = 3.6V, VOUT = 5.5V, L = 47μH

Copyright © 2000

Rev. 1.2, 2006-02-27

Microsemi

Integrated Products Division

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

Page 14

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