IRU1260

3

Rev. 2.1

09/19/02

www.irf.com

BLOCK DIAGRAM

Figure 2 - Simplified block diagram of the IRU1260.

The control input pin of the regulator. This pin via a 10

V resistor is connected to the 5V

supply to provide the base current for the pass transistor of both regulators. This allows

the regulator to have very low dropout voltage which allows one to generate a well regu-

lated 2.5V supply from the 3.3V input. A high frequency, 1

mF capacitor is connected

application circuit for the divider setting for 2.5V output.

application circuit for the divider setting for 1.5V output.

This pin is connected to ground. It is also the tab of the package.

The output #2 (high current) of the regulator. A minimum of 100

mF capacitor must be

connected from this pin to ground to insure stability.

The power input pin of the regulator. Typically a large storage capacitor is connected from

this pin to ground to insure that the input voltage does not sag below the minimum dropout

pins by the amount of the dropout voltage in order for the device to regulate properly.(See

data sheet)

The output #1 (low current) of the regulator. A minimum of 100

mF capacitor must be

connected from this pin to ground to insure stability.

PIN #

PIN SYMBOL

PIN DESCRIPTION

PIN DESCRIPTIONS

1

2

3

4

5

6

7

Gnd

Gnd

6

1

4

5

THERMAL

SHUTDOWN

1.20V

2

3

+