IRU1030-33 Ver la hoja de datos (PDF) - International Rectifier
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IRU1030-33 Datasheet PDF : 4 Pages
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IRU1030-33
PIN DESCRIPTIONS
PIN # PIN SYMBOL PIN DESCRIPTION
1
Gnd
This pin must be connected to ground plane using a low inductance short connection.
2
Vout
The output of the regulator. A minimum of 10µF capacitor must be connected from this pin
to ground to insure stability.
3
Vin
The 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 1.3V higher than Vout
in order for the device to regulate properly.
BLOCK DIAGRAM
Vin 3
2 Vout
+
CURRENT
LIMIT
1.25V +
THERMAL
SHUTDOWN
1030-33blk1-1.0
1 Gnd
Figure 2 - Simplified block diagram of the IRU1030-33
APPLICATION INFORMATION
Stability
The IRU1030-33 requires the use of an output capacitor as part of the frequency compensation in order to make the
regulator stable. Typical designs for microprocessor applications use standard electrolytic capacitors with a typical
ESR in the range of 50 to 100mΩ and an output capacitance of 500 to 1000µF. Fortunately as the capacitance
increases, the ESR decreases resulting in a fixed RC time constant. The IRU1030-33 takes advantage of this
phenomena in making the overall regulator loop stable. For most applications a minimum of 100µF aluminum
electrolytic capacitor such as Sanyo MVGX series, Panasonic FA series as well as the Nichicon PL series insures
both stability and good transient response.
Rev. 1.1
06/29/01
3
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