IRU1206 / IRU1207 / IRU1208 / IRU1209

1

Rev. 2.3

08/02/02

www.irf.com

TYPICAL APPLICATION

DESCRIPTION

The IRU1206 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

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

exceeding the minimum dropout characteristics of NPN/

PNP hybrid regulators. One common application of these

regulators is 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: micro-power shut-

down capability and output UVLO detection where Flag

pin is switched low when output is below 5% of its nomi-

nal point.

1A VERY LOW DROPOUT POSITIVE

FIXED AND ADJUSTABLE REGULATORS

PACKAGE ORDER INFORMATION

2-PIN TO-252

3-PIN

8-PIN PLASTIC

VOLTAGE

PIN FUNCTIONS

(D-PAK)

SOT-223 (Y)

SOIC (S)

0 To 125

IRU1206-18CD

IRU1206-18CY

NA

1.8V

0 To 125

IRU1206-25CD

IRU1206-25CY

NA

2.5V

0 To 125

IRU1206-33CD

IRU1206-33CY

NA

3.3V

0 To 125

NA

NA

IRU1207-18CS

1.8V

0 To 125

NA

NA

IRU1207-25CS

2.5V

0 To 125

NA

NA

IRU1207-33CS

3.3V

0 To 125

NA

NA

IRU1208CS

Adj

0 To 125

NA

NA

IRU1209CS

Adj

Data Sheet No. PD94134

Figure 1 - Typical application of the 1206-XX in a 3-Pin SOT-223 package.

Low Dropout Voltage (500mV at 1A)

1% Voltage Reference Accuracy

Low Ground Current

1

mA Maximum Quiescent Current in Shutdown

(IRU1207, IRU1208)

Fast Transient Response

Current Limit and Thermal Shutdown

Error Flag Signal for Output out of Regulation

(IRU1207, IRU1208)

FEATURES

2.5V Supply from 3.3V Input for the new

generation of Logic ICs

Computer Mother Board, Add-On Cards

High Efficiency Post Regulator in Switch Mode

Power Supply (SMPS)

APPLICATIONS

C1

C2

IRU1206-

XX

3

1

2

Gnd