LX1744CPW Microsemi Analog Mixed Signal Group, LX1744CPW Datasheet - Page 14
![IC LED DRVR WT/CLR BCKLT 14TSSOP](/photos/7/38/73853/lx1744cpw_sml.jpg)
LX1744CPW
Manufacturer Part Number
LX1744CPW
Description
IC LED DRVR WT/CLR BCKLT 14TSSOP
Manufacturer
Microsemi Analog Mixed Signal Group
Type
Backlight, White LED, Color LEDr
Datasheet
1.LX1744CPW.pdf
(16 pages)
Specifications of LX1744CPW
Constant Current
Yes
Topology
PWM, Step-Up (Boost)
Number Of Outputs
2
Internal Driver
Both
Type - Primary
Backlight
Type - Secondary
Color, White LED
Voltage - Supply
1.6 V ~ 6 V
Voltage - Output
25V
Mounting Type
Surface Mount
Package / Case
14-TSSOP
Operating Temperature
-40°C ~ 85°C
Current - Output / Channel
100mA
Internal Switch(s)
Yes
Efficiency
90%
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Frequency
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LX1744CPW
Manufacturer:
Microsemi Analog Mixed Signal
Quantity:
135
Copyright © 2000
Rev. 1.1b, 2005-03-01
Figure 10 – Output Voltage Vs. Adjustment Signal Threshold
CH1 – SWx Voltage, CH2 – Output Voltage, CH3 – Inductor Current
Note: The LX1744 uses the internal voltage reference
30
25
20
15
10
5
0
Figure 12 – Typical Switching Waveform
I N T E G R A T E D
0
until the VADJ signal exceeds 0.5V (typ).
V
IN
V O U T V E R S U S V A D J
Adjustment Signal Voltage (VADJx)
= 3.6V, V
W A V E F O R M
0.5
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
OUT
= 18V, I
1
P R O D U C T S
OUT
= 9mA
1.5
Integrated Products Division
Microsemi
2
Dual Output Boost – LED Driver / LCD Bias
Figure 13 – LED Driver (Upper) and LCD Bias Efficiency
Figure 11 – Gate Drive Voltage Vs. Drive Current
6
5
4
3
2
1
0
90%
85%
80%
75%
70%
65%
60%
55%
50%
0
V
0
P
IN
RODUCTION
20
= 5V, Four LEDs, L = 47µH, R
V
IN
= 3.6V, V
G A T E D R I V E
40
E F F I C I E N C Y
5
V
DRV Current (mA)
Output Current (mA)
IN
= 5V, T
60
OUT
10
D
ATASHEET
= 5.5V, L = 47µH
80
A
= 25°C
100 120 140 160
15
CS
= 4kΩ
20
LX1744
25
Page 14