US1206/1207/1208/1209

2-1

Rev. 1.1

6/26/00

TYPICAL APPLICATION

TYPICAL APPLICATION

DESCRIPTION

DESCRIPTION

The US1206 family of devices are ultra low dropout 1A

regulators using PNP transistor as the pass element.

These products are ideal when a single input supply is

available only and the dropout voltage is less than 1V,

exceeding the minimum dropout characteristics of NPN/

PNP hybrid regulators. One common application of these

regulators are where input is 3.3V and a 2.5V output is

needed.

Besides the low dropout of less than 0.5V, other fea-

tures of the family of the parts are; micropower shutdown

capability and output UVLO detection where Flag pin is

switched low when output is below 5% of its nominal

point. The US1206-XX in SOT223 is pin compatible with

MIC39100-XX, US1207 and 1209 in SO8 power package

are compatible with MIC39101 and 39102 respectively.

1A ULTRA LOW DROPOUT POSITIVE

ADJUSTABLE & FIXED REGULATOR

FEATURES

FEATURES

Low Droput Voltage (500mV at 1A)

1% Voltage Reference Accuracy

Low Ground Current

10uA Quiescent Current in Shutdown

(US1207,1208)

Fast Transient Response

Current Limit and Thermal Shutdown

Error Flag Signal for Output out of Regulation

(US1207,1209)

Pin Compatible with MIC39100/101/102 series

APPLICATIONS

APPLICATIONS

2.5V Supply from 3.3V Input for the new genera-

tion of Logic ICs

Computer Mother Board, Add on Cards

High Efficiency Post Regulator in SMPS

PRELIMINARY DATASHEET

PACKAGE ORDER INFORMATION

PACKAGE ORDER INFORMATION

Vin

Vout

C1

C2

1206app1-1.0

US1206-XX

1

2

3

Vin

Gnd

Vout

Tj (°C)

3 LEAD

5 LEAD

8 PIN PLASTIC

Voltage

Pin Functions

TO252

TO263

SOIC Power

0 TO 125

US1206-18CD US1206-18CY

US1206-18CM

1.8V

Vin, Vout, GND

0 TO 125

US1206-25CD US1206-25CY

US1206-25CM

2.5V

Vin, Vout, GND

0 TO 125

US1206-33CD US1206-33CY

US1206-33CM

3.3V

Vin, Vout, GND

0 TO 125

NA

US1207-18CM

US1207CS

1.8V

Vin, Vout, GND, Enable, Flag

0 TO 125

NA

US1207-25CM

US1207CS

2.5V

Vin, Vout, GND, Enable, Flag

0 TO 125

NA

US1207-33CM

US1207CS

3.3V

Vin, Vout, GND, Enable, Flag

0 TO 125

NA

US1208CM

US1208CS

Adj

Vin, Vout, GND, Flag, Adj

0 TO 125

NA

US1209CM

US1209CS

Adj

Vin, Vout, GND, Adj, Enable