Six-String White LED Driver with Active

Current Balancing for LCD Panel Applications

4

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ELECTRICAL CHARACTERISTICS

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

4.5

5.5

IN Input Voltage Range

5.5

26.0

V

2

2

mA

IN Quiescent Current

SHDN = GND

10

µA

4.7

5.3

V

12

130

mA

Rising edge, hysteresis = 20mV

4.00

4.45

V

STEP-UP CONVERTER

EXT High Level

10mA from EXT to GND

0.1

V

EXT Low Level

0.1

V

EXT On-Resistance

EXT high or low

5

Ω

OSC High-Level Threshold

0.4

V

OSC Midlevel Threshold

1.5

2.0

V

OSC Low-Level Threshold

0.4

V

0.9

1.1

MHz

675

825

Operating Frequency

450

550

kHz

Maximum Duty Cycle

94

%

CS Trip Voltage

Duty cycle = 75%

85

115

mV

CONTROL INPUT

SHDN Logic-Input High Level

2.1

V

SHDN Logic-Input Low Level

0.8

V

BRT, ENA Logic-Input High Level

2.1

V

BRT, ENA Logic-Input Low Level

0.8

V

INPUT LEAKAGE

SHDN Leakage Current

SHDN = 26V

+35

µA

CS Leakage Current

+50

µA

OSC Leakage Current

-3

+3

µA

BRT, ENA Leakage Current

-1

+1

µA

FSET, ISET Leakage Current

-1

+1

µA

OV Leakage Current

-0.1

+0.1

µA