Microsemi

Integrated Products Division

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

Page 2

Copyright

© 2000

Rev. 1.1a, 2006-01-19

LX8221

Dual 150mA CMOS Low Dropout Regulator

TM

®

ABSOLUTE MAXIMUM RATINGS

Input Voltage (VIN1, VIN2).......................................................................... -0.3V to +7V

Operating Temperature Range .....................................................................-40 to +125

°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.

PACKAGE PIN OUT

1

2

4

3

7

8

10

9

56

VIN1

EN1

GND

ADJ

VOUT2

VOUT1

CB1

NC

EN2

VIN2

(Top View)

“NC” = No Internal Connection

RoHS / Pb-free 100% Matte Tin Lead Finish

TH ERMAL DATA

DU

Plastic MSOP 8-Pin

THERMAL RESISTANCE

θ

JA

206

°C/W

The

system. All of the above assume no ambient airflow.

FRONT MARKING

8221

xIDU

LX

x = Voltage Combination

i.e. A = Adj/Adj

FUNCTIONAL PIN DESCRIPTION

VIN1/VIN2

Unregulated input supply voltage

GND

Ground Pin

EN1/EN2

Enable control input: Logic high = Enable; logic low or open = Shutdown

CB1

Reference bypass input. Adding an additional external capacitor reduces output noise.

VOUT1/VOUT2

Regulated output voltage. Regulator stability is achieved with external capacitor of 1µF

ADJ (1, 2)

Adjust pin. Connect a resistor divider to this pin to establish preferred output voltage.

B L O C K DI A G RAM

VOUT1

CB1

GND

+

-

CONTROL

LOGIC

THERMAL

SENSOR

CURRENT

LIMIT

VREF

VIN1

EN1

+

-

CONTROL

LOGIC

THERMAL

SENSOR

CURRENT

LIMIT

VREF

VIN2

EN2

ADJ

VOUT2