Microsemi

Integrated Products Division

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

Page 2

Copyright

© 2000

Rev. 1.0b, 2005-03-03

LX1993

High Efficiency LED Driver

I N T E GRA T ED

PR ODUC T S

ABSOLUTE MAXI MUM RATI NGS

Shutdown Input Voltage (V

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

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

system. All of the above assume no ambient airflow.

PACKAGE PIN OUT

1

2

4

3

5

6

8

7

SW

FB

IN

GND

OUT

CS

ADJ

(Top View)

SHDN

RoHS / Pb-free 100% Matte Tin Lead Finish

FRONT MARKING

•

pin 1 indicator

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 low voltage operation.

FB

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

current.

SHDN

Active-Low Shutdown Input – A logic low shuts down the device and reduces the supply current to <1µA.

SW

Inductor Switching Connection – Internally connected to the drain of a 28V N-channel MOSFET. SW is high

impedance in shutdown.

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

Output Current Adjustment Input – Provides the internal reference for the output current feedback. The signal

input can be either a PWM signal or analog voltage allowing a dynamic output current adjustment. The signal

exceed the device output current rating.

OUT

Output Current - Adjustable up to 25mA. Load voltage should not exceed 25V.

1993

C

• MSC