US1205

2-1

Rev. 1.4

9/25/00

DESCRIPTION

DESCRIPTION

The US1205 device is an efficient linear voltage regula-

tor with better than 1% initial voltage accuracy, very low

dropout voltage and very low ground current designed

especially for hand held, battery powered applications.

Other features of the device are; TTL compatible enable/

shutdown control input, current limiting and thermal

shutdown.

The US1205 is available in fixed and adjustable output

voltage versions in a small SOT23-5 package.

300 mA LOW DROPOUT POSITIVE

ADJUSTABLE REGULATOR

FEATURES

FEATURES

SOT23 package

Stable with 2.2uF ceramic capacitor

1% Voltage Reference Accuracy

Only 270mV Dropout at 300 mA

170mV Dropout at 150mA

10nA Quiescent Current in Shutdown

Current Limit and Thermal Shutdown

Logic input Enable pin

APPLICATIONS

APPLICATIONS

Laptop, Notebook & Palmtop computers

Battery powered Equipments

PCMCIA Vcc & Vpp regulator

Concumer Electronics

High Efficiency Linear Power Supplies

PRELIMINARY DATASHEET

PACKAGE ORDER INFORMATION

PACKAGE ORDER INFORMATION

Tj (°C)

5 LEAD

SOT23

Output

SOT 23

Marking

Voltage

0 TO 125

US1205CL

AT00

Adj

0 TO 125

US1205-25CL

AT25

2.5 V

0 TO 125

US1205-30CL

AT30

3.0 V

0 TO 125

US1205-33CL

AT33

3.3 V

0 TO 125

US1205-36CL

AT36

3.6 V

TYPICAL APPLICATION

TYPICAL APPLICATION

Typical application of the US1205 ajustable.

Typical application of the US1205 Fixed voltage.

Vin

Vout

R1

R2

C1

2.2uF

C2

2.2uF

1205app1-1.1

S.D.

5

3

4

Vout

Adj

2

Gnd

En

Enable

3.3V

2.5V

C3

1000pF

C1

2.2uF

C2

2.2uF

1205app2-1.2

S.D.

Enable

5

3

4

Vout

Byp

2

Gnd

En