LX1745CPW Microsemi Analog Mixed Signal Group, LX1745CPW Datasheet - Page 14

• Manufacturer Part Number: LX1745CPW
• Description: IC LED DRVR WT/CLR BCKLT 20TSSOP
• Manufacturer: Microsemi Analog Mixed Signal Group
• Type: Backlight, White LED, Color LEDr

Specifications of LX1745CPW

• Constant Current: Yes
• Topology: PWM, Step-Up (Boost)
• Number Of Outputs: 3
• 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: 20-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: -

Copyright © 2000
Rev. 1.2, 2006-02-27
Figure 12 – Output Voltage Vs. Adjustment Signal Threshold
CH1 – SWx Voltage, CH2 – Output Voltage, CH3 – Inductor Current
Note: The LX1745 uses the internal voltage reference
TM
30
25
20
15
10
5
0
Figure 14 – Typical Switching Waveform
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: [phone]
OUT
= 18V, I
1
OUT
= 9mA
1.5
Integrated Products Division
®
Microsemi
2
Triple Output Boost – LED Driver / LCD Bias
Figure 15 – LED Driver (Upper) and LCD Bias Efficiency
Figure 13 – 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
LX1745
25
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