iru1261 International Rectifier Corp., iru1261 Datasheet - Page 3

• Manufacturer Part Number: iru1261
• Description: Dual 6a And 1a Low Dropout Positive Fixed 1.5v And 2.5v Regulator
• Manufacturer: International Rectifier Corp.

PIN DESCRIPTIONS
PIN # PIN SYMBOL
BLOCK DIAGRAM
Rev. 2.0
09/19/02
1
2
3
4
5
V
CTRL
V
IN
V
V
V
Gnd
4
1
V
OUT
OUT
CTRL
IN
2
1
The control input pin of the regulator. This pin is connected, via a 10V resistor, 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, 1mF capacitor is connected
between this pin and V
The output #2 (high current) of the regulator. A minimum of 100mF capacitor must be
connected from this pin to ground to insure stability.
This pin is connected to ground. It is also the Tab of the package.
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 drop
out voltage during the load transient response. This pin must always be higher than both
V
regulate properly.
The output #1 (low current) of the regulator. A minimum of 100mF capacitor must be
connected from this pin to ground to insure stability.
OUT
PIN DESCRIPTION
pins by the amount of the dropout voltage (see data sheet) in order for the device to
Figure 2 - Simplified block diagram of the IRU1261.
SHUTDOWN
THERMAL
IN
pin to insure stability.
www.irf.com
1.20V
+
IRU1261
5 V
3
2 V
Gnd
OUT
OUT
1
2
3