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IRU1260CM 데이터시트 PDF




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부품번호 IRU1260CM 기능
기능 DUAL 6A AND 1A LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR
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IRU1260CM 데이터시트, 핀배열, 회로
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




IRU1260CM pdf, 반도체, 판매, 대치품
IRU1260
APPLICATION INFORMATION
Introduction
The IRU1260 is a dual adjustable Low Dropout (LDO)
regulator which can easily be programmed with the ad-
dition of two external resistors to any voltages within
the range of 1.20 to 5.5V. This voltage regulator is de-
signed specifically for applications that require two sepa-
rate regulators such as the Intel Pentium IITM proces-
sors requiring 1.5V and 2.5V supplies, eliminating the
need for a second regulator which results in lower over-
all system cost. When VCTRL pin is connected to a sup-
ply which is at least 1V higher than VIN, the dropout
voltage improves by 30% which makes it ideal for appli-
cations requiring less than the standard 1.3V dropout
given in the LDO products such as IRU10XX series. The
IRU1260 also provides an accurate 1.20V voltage refer-
ence common to both regulators for programming each
output voltage. Other features of the device include: fast
response to sudden load current changes, such as GTL+
termination application for Pentium IITM family of micro-
processors. The IRU1260 also includes thermal shut-
down protection to protect the device if an overload con-
dition occurs.
Output Voltage Setting
The IRU1260 can be programmed to any voltages in the
range of 1.20V to 5.5V with the addition of R1 and R2
external resistors according to the following formula:
( )VOUT = VREF3
1+
R2
R1
+R23IB
Where:
VREF = 1.20V Typically
IB = 0.02mA Typical
R1 and R2 as shown in Figure 3:
The IRU1260 keeps a constant 1.2V between the VFB
pin and ground pin. By placing a resistor R1 across these
two pins a constant current flows through R1, adding to
the IFB current and into the R2 resistor producing a volt-
age equal to the (1.2/R1)3R2 + IFB3R2 which will be
added to the 1.2V to set the output voltage as shown in
the above equation. Since the input bias current of the
amplifier (IFB) is only 0.02mA typically, it adds a very
small error to the output voltage and for most applica-
tions can be ignored. For example, in a typical 1.5V
GTL+application if R1=10.2KV and R2=2.55KV the er-
ror due to the IADJ is only 0.05mV which is less than
0.004% of the nominal set point. The effective input im-
pedance seen by the feedback pins (The parallel combi-
nation of R1 and R2) must always be higher than 1.8KV
in order for the regulator to start up properly.
Load Regulation
Since the IRU1260 does not provide a separate ground
pin for the reference voltage, it is not possible to provide
true remote sensing of the output voltage at the load.
Figure 4 shows that the best load regulation is achieved
when the bottom side of R1 resistor is connected di-
rectly to the ground pin of IRU1260 (preferably to the tab
of the device) and the top side of R2 resistor is con-
nected to the load. In fact, if R1 is connected to the load
side, the effective resistance between the regulator and
the load is gained up by the factor of (1+R2/R1), or the
effective resistance will be, RP(eff)=RP3(1+R2/R1). It is
important to note that for high current applications, this
can represent a significant percentage of the overall load
regulation and one must keep the path from the regula-
tor to the load as short as possible to minimize this
effect.
VI N
V IN
V OUT
VIN
VCTRL
VIN VOUT
IRU1260
V CTRL
Gnd
IB
V FB
V REF
R2
R1
VOUT
VC T R L
IRU1260
V CTRL
Gnd
V FB
R2
R1
RL
Figure 3 - Typical application of the IRU1260
for programming the output voltage.
(Only one output is shown here)
RP
PARASITIC LINE
RESISTANCE
Figure 4 - Schematic showing connection
for best load regulation.
(Only one output is shown here)
4 www.irf.com
Rev. 2.1
09/19/02

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IRU1260CM 전자부품, 판매, 대치품
IRU1260
TYPICAL APPLICATION
PENTIUM Ι Ι ™ APPLICATION
3.3V
C1
U1
IRU1260
VOUT1 7
VIN 6
VOUT2 5
Gnd 4
VFB2 3
VFB1 2
1VCTRL
C4
R5
C5
R1
R2
R3
R4
2.5V / 1A
C2
1.5V / 6A
C3
5V
Figure 5 - Typical application of IRU1260 in the Pentium ΙΙ™ design with the 1.5V output
providing for GTL+ termination while 2.5V supplies the clock chip.
Note:Pentium ΙΙ is trademark of Intel Corp.
Ref Desig
U1
C1, C3
C2
C4
C5
R1
R2, R4
R3
R5
HS1
Description
Qty
Dual LDO Regulator
Capacitor
Capacitor
Capacitor
Capacitor
Resistor
Resistor
Resistor
Resistor
Heat Sink
1
2
1
1
1
1
2
1
1
Part #
Manuf
IRU1260CM
IR
Elect, 680mF, EEUFA1A681L
Panasonic
Elect, 220mF, 6.3V, ECAOJFQ221 Panasonic
Ceramic, 0.1mF, SMT, 0805
Panasonic
Elect,100mF, 6.3V, ECAOJFQ101 Panasonic
11KV, 1%, SMT, 0805
Panasonic
10.2KV, 1%, SMT, 0805
Panasonic
2.55KV, 1%, SMT, 0805
Panasonic
3V, 5%, SMT, 0805
Panasonic
Use 1" Square Copper Pad area if IOUT2<1.7A &
IOUT1<0.2A. For IOUT2<3A & IOUT1<0.5A, use
IRU1260CT and Thermalloy 6030B
Rev. 2.1
09/19/02
www.irf.com
7

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