IRU1205

IRU1205-18 / IRU1205-25 / IRU1205-28

IRU1205-30 / IRU1205-33 / IRU1205-36

1

Rev. 2.3

07/16/02

www.irf.com

DESCRIPTION

The IRU1205 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 shut-

down.

The IRU1205 is available in fixed and adjustable output

voltage versions in a small SOT-23 5-Pin package.

300mA ULTRA LOW DROPOUT POSITIVE

ADJUSTABLE AND FIXED REGULATORS

SOT-23 Package

Stable with 2.2

mF Ceramic Capacitor

1% Voltage Reference Accuracy

Only 270mV Dropout at 300mA

and 170mV Dropout at 150mA

5

mA Quiescent Current in Shutdown

Current Limit and Thermal Shutdown

Logic Input Enable Pin

TYPICAL APPLICATION

Figure 1 - Typical application of the IRU1205 ajustable voltage regulator.

Figure 2 - Typical application of the IRU1205-25 fixed voltage regulator.

Data Sheet No. PD94133

APPLICATIONS

Laptop, Notebook & Palmtop computers

Battery Powered Equipments

PCMCIA Vcc & Vpp Regulator

Consumer Electronics

High Efficiency Linear Power Supplies

FEATURES

PACKAGE ORDER INFORMATION

5-PIN

SOT-23

OUTPUT

SOT-23 (L5)

MARKING

VOLTAGE

0 To 125

IRU1205CL

AT00

Adj

0 To 125

IRU1205-18CL

AT18

1.8V

0 To 125

IRU1205-25CL

AT25

2.5V

0 To 125

IRU1205-28CL

AT28

2.8V

0 To 125

IRU1205-30CL

AT30

3.0V

0 To 125

IRU1205-33CL

AT33

3.3V

0 To 125

IRU1205-36CL

AT36

3.6V

R1

R2

C1

2.2uF

C2

2.2uF

SD

Enable

5

3

4

Adj

2

Gnd

En

3.3V

2.5V

C3

1000pF

C1

2.2uF

C2

2.2uF

SD

Enable

5

3

4

2

Gnd

En

Vo = 1.25

3 1+

R1

R2

(

)