IRU1260CM(2002) Ver la hoja de datos (PDF) - International Rectifier
Número de pieza
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Fabricante
IRU1260CM Datasheet PDF : 12 Pages
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IRU1260
PIN DESCRIPTIONS
PIN #
1
PIN SYMBOL PIN DESCRIPTION
VCTRL
The control input pin of the regulator. This pin via a 10V 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, 1mF capacitor is connected
between this pin and VIN pin to insure stability.
2
VFB1
A resistor divider from this pin to VOUT1 pin and ground sets the output voltage. See
application circuit for the divider setting for 2.5V output.
3
VFB2
A resistor divider from this pin to the VOUT2 pin and ground sets the output voltage. See
application circuit for the divider setting for 1.5V output.
4
Gnd
This pin is connected to ground. It is also the tab of the package.
5
VOUT2
The output #2 (high current) of the regulator. A minimum of 100mF capacitor must be
connected from this pin to ground to insure stability.
6
VIN
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
voltage during the load transient response. This pin must always be higher than both VOUT
pins by the amount of the dropout voltage in order for the device to regulate properly.(See
data sheet)
7
VOUT1
The output #1 (low current) of the regulator. A minimum of 100mF capacitor must be
connected from this pin to ground to insure stability.
BLOCK DIAGRAM
VIN 6
7 VOUT1
VCTRL 1
2 VFB1
Rev. 2.1
09/19/02
THERMAL
SHUTDOWN
1.20V +
4 Gnd
3 VFB2
Figure 2 - Simplified block diagram of the IRU1260.
5 VOUT2
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