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IRU1176 Datasheet(PDF) 4 Page - International Rectifier

Part No. IRU1176
Description  7.5A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR WITH SHUTDOWN INPUT
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Maker  IRF [International Rectifier]
Homepage  http://www.irf.com
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IRU1176 Datasheet(HTML) 4 Page - International Rectifier

   
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4
Rev. 1.4
03/18/02
IRU1176
www.irf.com
APPLICATION INFORMATION
Introduction
The IRU1176 adjustable regulator is a five-terminal de-
vice designed specifically to provide extremely low drop-
out voltages comparable to the PNP type without the
disadvantage of the extra power dissipation due to the
base current associated with PNP regulators. This is
done by bringing out the control pin of the regulator that
provides the base current to the power NPN and con-
necting it to a voltage that is grater than the voltage present
at the VIN pin. This flexibility makes the IRU1176 ideal
for applications where dual inputs are available such as
a computer mother board with an ATX style power sup-
ply that provides 5V and 3.3V to the board. One such
application is the new graphic chip sets that require any-
where from 2.4V to 2.7V supply such as the Intel
I740
chip set. The IRU1176 can easily be programmed with
the addition of two external resistors to any voltages
within the range of 1.25 to 5.5V. Another major require-
ment of these graphic chips is the need to switch the
load current from zero to several amps in tens of nano-
seconds at the processor pins, which translates to an
approximately 300 to 500ns of current step at the regu-
lator. In addition, the output voltage tolerances are also
extremely tight and they include the transient response
as part of the specification.
The IRU1176 is specifically designed to meet the fast
current transient needs as well as providing an accurate
initial voltage, reducing the overall system cost with the
need for fewer number of output capacitors. Another fea-
ture of the device is its true remote sensing capability
which allows accurate voltage setting at the load rather
than at the device.
Output Voltage Setting
The IRU1176 can be programmed to any voltages in the
range of 1.25V to 5.5V with the addition of R1 and R2
external resistors according to the following formula:
Figure 3 - Typical application of the IRU1176 for
programming the output voltage.
BLOCK DIAGRAM
Figure 2 - Simplified block diagram of the IRU1176.
Where:
VREF = 1.25V Typically
IADJ = 50
mA Typically
R1 & R2 as shown in Figure 3:
VOUT = VREF
3
oo1 + pp+ I
ADJ
3 R2
R2
R1
VCTRL
VIN
VSENSE
Adj
VOUT
OUTPUT
SHUTDOWN
CURRENT
LIMIT
1.25V
THERMAL
SHUTDOWN
SD
+
+
6,7
5
2
3
1
4
VOUT
R1
R2
VIN
VCTRL
VREF
IADJ = 50uA
IRU1176
VSENSE
SD
VOUT
VCTRL
VIN
Adj
Open


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