Microsemi

Integrated Products Division

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

Page 3

Copyright

© 2000

Rev. 1.0b, 2005-03-03

LX1993

High Efficiency LED Driver

I N T E GRA T ED

PR ODUC T S

ELECTRI CAL CHA RACTERI S TI CS

LX1993

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

Guaranteed; not tested

-2

mV/°C

Not switching

70

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

-150

50

nA

Shutdown Input Bias Current

-100

100

nA

Shutdown High Input Voltage

1.6

V

Shutdown Low Input Voltage

0.4

V

Current Sense Bias Current

2

6

µA

Minimum Peak Current

85

155

mA

Internal NFET On-resistance

1.1

Ω

Switch Pin Leakage Current

0.23

µA

Maximum Switch Off-Time

100

300

500

ns

Diode Forward Voltage

1.0

V

Diode Reverse Current

1.5

µA

SI MPLIFI ED BLOCK DI AGRAM

Control

Logic

Reference

Logic

ADJ

FB

Shutdown

Logic

SHDN

CS

Driver

GND

SW

IN

OUT

50pF

A1

A2