Microsemi

Linfinity Microelectronics Division

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

Page 3

Copyright

© 2000

Rev. 1.1b, 2005-03-03

LX1992

High Efficiency LED Driver

TM

®

ELECTRI CAL CHA RACTERI S TI CS

Unless otherwise specified, the following specifications apply over the operating ambient temperature 0°C

LX1992

Parameter

Symbol

Test Conditions

Min

Typ

Max

Units

Operating Voltage

1.6

6.0

V

Minimum Start-up Voltage

1.6

V

Start-up Voltage Temperature

Coefficient

-2

mV/°C

50

100

µA

Quiescent Current

0.2

0.5

µA

FB Threshold Voltage

275

300

325

mV

FB Input Bias Current

-100

100

nA

ADJ Input Voltage Range

0.0

V

ADJ Input Bias Current

VADJ < 0.3V

-150

0

nA

Shutdown Input Bias Current

SHDN = GND

-50

50

nA

Shutdown High Input Voltage

1.6

V

Shutdown Low Input Voltage

0.4

V

Current Sense Bias Current

VFB < 0.3V

3.0

5.0

7.0

µA

Minimum Peak Current

53

83

mA

Efficiency

η

85

%

NDRV Sink Current

50

mA

NDRV Source Current

100

mA

Off-Time

100

500

ns

SI MPLIFI ED BLOCK DI AGRAM

Control

Logic

Reference

Logic

ADJ

FB

Shutdown

Logic

SHDN

CS

Driver

GND

DRV

IN

SRC

50pF

A

B