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IRU1150CS 데이터시트 PDF




International Rectifier에서 제조한 전자 부품 IRU1150CS은 전자 산업 및 응용 분야에서
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부품번호 IRU1150CS 기능
기능 4A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR
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IRU1150CS 데이터시트, 핀배열, 회로
FEATURES
0.7V Dropout at 4A
Fast Transient Response
1% Voltage Reference Initial Accuracy
Built-In Thermal Shutdown
APPLICATIONS
3.3V to 2.7V Intel I740 Chip Set
TYPICAL APPLICATION
Data Sheet No. PD94129
IRU1150
4A ULTRA LOW DROPOUT POSITIVE
ADJUSTABLE REGULATOR
DESCRIPTION
The IRU1150 is a 4A regulator with extremely low drop-
out voltage using a proprietary bipolar process that
achieves comparable equivalent on-resistance to that of
discrete MOSFETs. This product is specifically designed
to provide well regulated supply for applications requir-
ing 2.8V or lower voltages from 3.3V ATX power supplies
where high efficiency of a switcher can be achieved with-
out the cost and complexity associated with switching
regulators. One such application is the new graphic chip
sets that require anywhere from 2.4V to 2.7V supply
such as the Intel I740 chip set.
3.3V
C1
100uF
VIN 5
IRU1150
VCTRL 4
VOUT 3
Adj 2
VSENSE 1
5V
C2
100uF
2.7V
R1
102
C3
R2 100uF
118
Figure 1 - Typical application of IRU1150 in a 3.3V to 2.7V for I740 chip.
PACKAGE ORDER INFORMATION
TJ (°C)
0 To 125
5-PIN PLASTIC
TO-263 (M)
IRU1150CM
5-PIN PLASTIC
Ultra Thin-PakTM (P)
IRU1150CP
8-PIN PLASTIC
SOIC (S)
IRU1150CS
Rev. 1.6
03/18/02
www.irf.com
1




IRU1150CS pdf, 반도체, 판매, 대치품
IRU1150
BLOCK DIAGRAM
VIN 5
3 VOUT
VCTRL 4
+
CURRENT
LIMIT
1.25V +
1 VSENSE
THERMAL
SHUTDOWN
2 Adj
Figure 2 - Simplified block diagram of the IRU1150.
APPLICATION INFORMATION
Introduction
The IRU1150 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 IRU1150 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 IRU1150 can easily be programmed with
the addition of two external resistors to any voltages
within the range of 1.25 to 5.5 V. Another major require-
ment of these graphic chips such as the Intel I740 is the
need to switch the load current from zero to several amps
in tens of nanoseconds at the processor pins, which
translates to an approximately 300 to 500ns of current
step at the regulator. In addition, the output voltage tol-
erances are also extremely tight and they include the
transient response as part of the specification.
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 IRU1150 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:
VOUT = VREF 3 o1 + RR21p + IADJ 3 R2
Where:
VREF = 1.25V Typically
IADJ = 50mA Typically
R1 and R2 as shown in Figure 3:
VIN
VC T R L
VIN VOUT
IRU1150
V CTRL
VSENSE
Adj
VREF R1
IADJ = 50uA
R2
VOUT
The IRU1150 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
Figure 3 - Typical application of the IRU1150
for programming the output voltage.
4 www.irf.com
Rev. 1.6
03/18/02

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