US431L/431AL

2-6

Rev. 1.2

5/11/98

TYPICAL APPLICATION

TYPICAL APPLICATION

I740 Application

Figure 3- Low cost 3.3V to 2.7V 0utput for Intel I740 application.

431app3-1.1

12V

R3

R2

R1

U1

C1

Q1

C2

Ref Desig

Description

Qty

Part #

Manuf

U1

Shunt Regulator

1

US431L

Unisem

C1,2

Capacitor

2

Elect,220uF,6.3V,ECAOJFQ221

Panasonic

R1

Resistor

1

6.2k

Ω, 5%, SMT

R2

Resistor

1

118

Ω, 1%, SMT

R3

Resistor

1

100

Ω, 1% SMT

HS1

Heat Sink

Use minimum of 1" Square Copper Pad area

for load current <4A