Microsemi

Integrated Products 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

LX1741

High Efficiency High Voltage Boost Controller

I N T E GRA T ED

PR ODUC T S

ABSOLUTE MAXI MUM RATI NGS

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 seconds 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

SRC

CS

GND

IN

NDRV

FB

ADJ

SHDN

(Top View)

4

3

2

1

5

6

7

8

SRC

CS

GND

SHDN

NDRV

FB

IN

ADJ

(Top View)

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

(see Output Voltage Programming: Application Information).

SHDN

Active-Low Shutdown Input – A logic low shuts down the device and reduces the supply current to 0.1µA.

NDRV

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

An applied PWM Signal Input becomes the internal reference, via an internal filter and gain resistor, thus allowing

for a dynamic output voltage adjustment of ±15% (i.e., corresponding to the duty cycle variance). Connecting this

pin to ground causes the device to revert to the internal voltage reference (note: refer to figure 8).

SRC

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