Microsemi

Linfinity Microelectronics Division

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

Page 2

Copyright

© 2000

Rev. 1.1b, 2005-03-03

LX1992

High Efficiency LED Driver

TM

®

ABSOLUTE MAXI MUM RATI NGS

Shutdown Input Voltage (V

Operating Junction Temperature.................................................................. 150°C

Storage Temperature Range...........................................................-65°C to 150°C

Lead Temperature (Soldering 180 seconds) ................................................ 235°C

Peak Package Solder Reflow Temp. (40 second max. exposure) ... 260°C (+0, -5)

Note: Exceeding these ratings could cause damage to the device. All voltages are with respect to

Ground. Currents are positive into, negative out of specified terminal

.

TH ERM A L DATA

DU

Plastic MSOP 8-Pin

THERMAL RESISTANCE

206

°C/W

THERMAL RESISTANCE

39

°C/W

LM

Plastic MLP 8-Pin

THERMAL RESISTANCE

41

°C/W

THERMAL RESISTANCE

5.2

°C/W

system. All of the above assume no ambient airflow.

PACKAGE PIN OUT

1

2

4

3

5

6

8

7

DRV

FB

IN

GND

SRC

CS

ADJ

(Top View)

SHDN

4

3

2

1

5

6

7

8

(Top View)

DRV

FB

IN

SHDN

SRC

CS

GND

ADJ

RoHS / Pb-free 100% Matte Tin Lead Finish

FUNCTIONAL PIN DESCRIPTION

IN

Unregulated IC Supply Voltage Input – Input range from +1.6V to 6.0V. Bypass with a 1µF or greater capacitor

for operation below 2.0V.

FB

Feedback Input – Connects to a current sense resistor between the output load and GND to set the output

current.

SHDN

Active-Low Shutdown Input – A logic low shuts down the device and reduces the supply current to 0.2µA (Typ).

DRV

MOSFET Gate Driver – Connects to an external N-Channel MOSFET.

CS

Current-Sense Amplifier Input – Connecting a resistor between CS and GND sets the peak inductor current limit.

GND

Common terminal for ground reference.

ADJ

Adjustment Signal Input – Provides the internal reference, via an internal filter and gain resistor, allowing a

dynamic output current adjustment corresponding to a varying duty cycle. The actual ADJ pin voltage range is

0.0V to 0.5V should be used.

SRC

MOSFET Current Sense Input - Connects to the External N-Channel MOSFET Source.

Note: ADJ pin should not be left floating.