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IRU1260CM の電気的特性と機能

IRU1260CMのメーカーはInternational Rectifierです、この部品の機能は「DUAL 6A AND 1A LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR」です。


製品の詳細 ( Datasheet PDF )

部品番号 IRU1260CM
部品説明 DUAL 6A AND 1A LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR
メーカ International Rectifier
ロゴ International Rectifier ロゴ 




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IRU1260CM Datasheet, IRU1260CM PDF,ピン配置, 機能
Data Sheet No. PD94138
IRU1260
DUAL 6A AND 1A LOW DROPOUT
POSITIVE ADJUSTABLE REGULATOR
FEATURES
Guaranteed <1.3V Dropout at 6A (Output #2)
Guaranteed <0.6V Dropout at 1A (Output #1)
Fast Transient Response
1% Voltage Reference Initial Accuracy
Built-In Thermal Shutdown
APPLICATIONS
Providing a Single Package Solution for GTL+ and
High Speed Bus Termination
Dual Supply P55CApplications
DESCRIPTION
The IRU1260 uses a proprietary process and combines
a dual low dropout adjustable output regulator in a single
package with one output having a minimum of 6A and
the other one having a 1A output current capability. This
product is specifically designed to provide well regulated
supplies for low voltage ICs such as 3.3V to 1.5V and
2.5V supplies for the GTL+ termination and the new
clock for Pentium IITM applications. Other applications
include low cost dual supply for processors such as Intel
P55CTM where 2.8V and 3.3V are needed for the Core
and the I/O supplies from the 5V input.
TYPICAL APPLICATION
3.3V
C1
VOUT1 7
VIN 6
U1 VOUT2 5
IRU1260 Gnd 4
VFB2 3
VFB1 2
VCTRL 1
C4
R5
C5
R1
R2
R3
R4
2.5V / 1A
C2
1.5V / 6A
C3
5V
Figure 1 - Typical application of IRU1260 in the Pentium IITM design with the 1.5V output
providing for GTL+ termination while 2.5V supplies the clock chip.
Notes: Pentium IITM is trademark of Intel Corp.
P55CTM is trademark of Intel Corp.
PACKAGE ORDER INFORMATION
TJ (°C)
0 To 150
7-PIN PLASTIC
TO-263 (M)
IRU1260CM
7-PIN PLASTIC
Ultra Thin-PakTM (P)
IRU1260CP
Rev. 2.1
09/19/02
www.irf.com
1

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IRU1260CM pdf, ピン配列
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
www.irf.com
3


3Pages


IRU1260CM 電子部品, 半導体
IRU1260
Layout Consideration
The IRU1260 like all other high speed linear regulators
need to be properly laid out to insure stable operation.
The most important component is the output capacitor,
which needs to be placed close to the output pin and
connected to this pin using a plane connection with a
low inductance path.
The maximum power dissipation of the Intel 740 chip is
5.8W, which at 2.7V results in:
Io = 5.8 = 2.15A
2.7
a) Using standard LDO, the power dissipated in the de-
vice is:
IRU1260 in Ultra LDO, Single Output Application
The IRU1260 can also be used in single supply applica-
tions where the difference between input and output is
much lower than the standard 1.5V dropout that is ob-
tainable with standard LDO devices. The schematic in
Figure 7 shows the application of the IRU1260 in a single
supply with the second LDO being disabled.
In this application, the IRU1260 is used on the VGA
card to convert 3.3V supply to 2.7V to power the Intel
740 chip rather than the conventional LDO which due to
its 1.5V minimum dropout spec must use the 5V supply
to achieve the same result. The difference is a substan-
tial decrease in the power dissipation as shown below.
PD = (VIN - Vo)3Io = (5 - 2.7)32.15 = 4.94W
Using surface mount TO-263 package with 258C/W
junction to air thermal resistance results in:
TJ = PD3uJA + TA = 4.94325 + 25 = 1488C
This is very close to the thermal shutdown of the IC.
b) Using IRU1260, the power dissipated in the device is
drastically reduced by using 3.3V supply instead of
5V.
PD = (VIN - Vo)3Io = (3.3 - 2.7)32.15 = 1.3W
Using surface mount TO-263 package with 258C/W
junction to air thermal resistance results in:
TJ = PD3uJA + TA = 1.3325 + 25 = 578C
A reduction of 918C in junction temperature.
6 www.irf.com
Rev. 2.1
09/19/02

6 Page



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共有リンク

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部品番号部品説明メーカ
IRU1260CM

DUAL 6A AND 1A LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR

International Rectifier
International Rectifier
IRU1260CP

DUAL 6A AND 1A LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR

International Rectifier
International Rectifier


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