IRU1015 Ver la hoja de datos (PDF) - International Rectifier
Número de pieza
componentes Descripción
Lista de partido
IRU1015 Datasheet PDF : 8 Pages
| |||
IRU1015
PIN DESCRIPTIONS
PIN # PIN SYMBOL PIN DESCRIPTION
1
Adj
A resistor divider from this pin to the Vout pin and ground sets the output voltage.
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
1015blk1-1.0
Figure 2 - Simplified block diagram of the IRU1015
1 Adj
APPLICATION INFORMATION
Introduction
The IRU1015 adjustable Low Dropout (LDO) regulator is
a three-terminal device which can easily be programmed
with the addition of two external resistors to any volt-
ages within the range of 1.25 to 5.5 V.This regulator un-
like the first generation of the three-terminal regulators
such as LM117 that required 3V differential between the
input and the regulated output, only needs 1.3V differen-
tial to maintain output regulation. This is a key require-
ment for today’s microprocessors that need typically
3.3V supply and are often generated from the 5V sup-
ply. Another major requirement of these microproces-
sors is the need to switch the load current from zero to
full load in tens of nanoseconds at their pins, which
translates to an approximately 300 to 500ns current step
at the regulator. In addition, the output voltage toler-
ances are sometimes tight and they include the tran-
sient response as part of the specification.
The IRU1015 is specifically designed to meet the fast
current transient needs as well as provide an accurate
initial voltage, reducing the overall system cost with the
need for fewer output capacitors.
Rev. 1.1
06/29/01
3
Share Link: 