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LX1744CLQ

Dual Output Boost – LED Driver / LCD Bias

Microsemi Corporation 

INTEGRATED PRODUCTS

LX1744

Dual Output Boost – LED Driver / LCD Bias

PRODUCTION DATASHEET

ELECTRICAL CHARACTERISTICS

Unless otherwise specified, the following specifications apply over the operating ambient temperature 0°C ≤ TA ≤ 70°C except where

otherwise noted and the following test conditions: VIN = 3V, ILED = 20mA, SHDN1 = VIN, SHDN2 = VIN

Parameter

` LED DRIVER

LFB Threshold Voltage

LFB Input Bias Current

BRT Input Voltage Range

BRT Input Bias Current

LED Driver Shutdown Input

Bias Current

LED Driver Shutdown High

Input Voltage

LED Driver Shutdown Low Input

Voltage

Current Sense Bias Current

Efficiency

DRV Sink/Source Current

DRV On-Resistance

Maximum Switch On-Time

Minimum Switch Off-Time

Switch Peak Current

OVP Threshold Voltage

` LCD BIAS

Output Voltage Range

FB Threshold Voltage

FB Input Current

LCD Bias Shutdown Input Bias

Current

LCD Bias Shutdown High Input

Voltage

LCD Bias Shutdown Low Input

Voltage

Peak Inductor Current Limit

Internal NFET On-resistance

Switch Pin Leakage Current

Efficiency

Switch On-Time

Switch Off-Time

ADJ Input Voltage Range

ADJ Input Bias Current

` ENTIRE REGULATOR

Operating Voltage

Minimum Start-up Voltage

Start-up Voltage Temperature

Coefficient

Reference Voltage

Quiescent Current

Symbol

VLFB

VBRT

I SHDN1

V SHDN1

V SHDN1

ICS

η

tON

tOFF

IPK

VOVP

VOUT

VFB

I SHDN

V SHDN

V SHDN

ILIM

RDS(ON)

ILEAK

η

tON

tOFF

VADJ

IADJ

VIN

VREF

IQ

Test Conditions

LX1744

Units

Min Typ Max

VBRT = 100mV

VBRT = 20mV

VLFB = 100mV

BRT = VREF

0.0V ≤ LSHDN ≤ VIN

VIN = 2V

VIN = 2V

ILOAD = 2mA

VIN = 5V, DRV = 3V

VCC = 5V

VFB = 1V

VFB = 1V

RCS = 0Ω

RCS = 2kΩ

95

5

100

20

115

35

mV

-100

100 nA

0.0

VIN

V

0

60 nA

-100

100 nA

1.6

V

0.4

V

4

µA

90

%

85 100

mA

12

15

Ω

∞

µS

200 300 410 nS

170

210

mA

1.15 1.21V 1.26 V

VFB = 1.4V

SHDN = GND

VIN = 2V

VIN = 2V

ISW = 10mA, TA = 25°C, VIN = 5V

VSW = 25V

ILOAD = 2mA

VFB = 1V

VFB = 1V

VADJ = 1.5V

25

V

1.172 1.196 1.220 V

200 nA

100 nA

1.6

V

0.4

V

195

mA

1.1

Ω

1

µA

85

%

∞

µs

150

400 Ns

0.9

1.5

V

0.3

1

µA

1.6

TA = +25°C

1.187

VFB = 0.3V, VLFB < VBRT – 0.1V

VFB = 0.3V, VLFB < VBRT – 0.1V, VLSHDN < 0.4V

VFB = 0.3V, VLFB < VBRT – 0.1V, VSHDN < 0.4V

VLSHDN < 0.4V, VSHDN < 0.4V

-2

1.21

120

60

60

0.35

6.0

V

1.6

V

mV/°C

1.236 V

200

135

135 µA

0.5

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

Page 4

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