INTEGRATED PRODUCTS
LX1744
Dual Output Boost – LED Driver / LCD Bias
PRODUCTION DATASHEET
EVALUATION BOARD
Name
Table 1: Input and Output Pin Assignments
Input/Output
Range
Description
VIN
0 to 6V
Main power supply for outputs.
GNDx
ADJ
0V
0 to VIN-100mV
Common ground reference.
Apply a DC voltage or a PWM voltage to this pin to adjust the LCD1
output voltage. PWM inputs should be greater than 120Hz.
SHDN
SHDN
0 to VIN
Pulled up to VIN on board (10KΩ), Ground to inhibit the LED driver
output (VOUT).
Pulled up to VIN on board (10KΩ), Ground to inhibit the VLCD1.
VLCD
≤25V
Output voltage test point. Programmed for 18V output, adjustable up to
25V.
-VLCD
VOUT
≥-25V
≤25V
Output voltage mirror of VLCD1
LED drive voltage probe point.
LFB
BRT
0 to VIN
0 to 350mV
LED current sense feedback.
Apply a DC voltage or a PWM voltage to this pin to adjust the LED
current. PWM inputs should be greater than 120Hz with a DC portion
less than 350mV.
DRV
0 to VIN
LED Driver MOSFET Gate Driver Output
REF
1.19V Typ. Buffered IC reference output.
Note: All pins are referenced to ground.
Copyright © 2000
Rev. 1.1b, 2005-03-01
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
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