IRU1075CPPBF [INFINEON]
Adjustable Positive LDO Regulator, 1.25V Min, 5.5V Max, 1.2V Dropout, PSSO3, PLASTIC, ULTRA THIN PAK-3;
| 型号： | IRU1075CPPBF |
| 厂家： | 
Infineon |
| 描述： | Adjustable Positive LDO Regulator, 1.25V Min, 5.5V Max, 1.2V Dropout, PSSO3, PLASTIC, ULTRA THIN PAK-3 输出元件 调节器 |
| 文件： | 总9页 (文件大小：56K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Data Sheet No. PD94128
IRU1075
7.5A LOW DROPOUT POSITIVE
ADJUSTABLE REGULATOR
FEATURES
DESCRIPTION
1V Dropout at Full Load Current
Fast Transient Response
The IRU1075 is a low dropout three-terminal adjustable
regulator with minimum of 7.5A output current capabil-
ity. This product is specifically designed to provide well
regulated supply for low voltage IC applications such as
Pentiumä P54Cä , P55Cä as well as GTL+ termina-
tion for Pentium Proä and Klamathä processor appli-
cations. The IRU1075 is also well suited for other pro-
cessors such as Cyrixä , AMD and Power PCä appli-
cations. The IRU1075 is guaranteed to have <1.2V drop-
out at full load current making it ideal to provide well
regulated outputs such as 3.3V with input supply volt-
age as low as 4.5V minimum.
1% Voltage Reference Initial Accuracy
Output Current Limiting
Built-In Thermal Shutdown
APPLICATIONS
Low Voltage Processor Applications such as:
P54Cä ,P55Cä , Cyrix M2ä ,
POWER PCä , AMD
GTL+ Termination
PENTIUM PROä , KLAMATHä
Low Voltage Memory Termination Applications
Standard 3.3V Chip Set and Logic Applications
TYPICAL APPLICATION
5V
C1
1500uF
V
IN
3
2
V
OUT
3.3V
IRU1075
R1
121
C2
2x 1500uF
R2
200
Adj 1
Typical application of IRU1075 in a 5V to 3.3V regulator.
Notes:Pentium P54C, P55C, Klamath, Pentium Pro, VRE are trademarks of Intel Corp. Cyrix M2 is trademark of Cyrix Corp.
Power PC is trademark of IBM Corp.
PACKAGE ORDER INFORMATION
TJ (°C)
3-PIN PLASTIC
TO-220 (T)
3-PIN PLASTIC
TO-263 (M)
IRU1075CM
3-PIN PLASTIC
Ultra Thin-PakTM (P)
IRU1075CP
0 To 150
IRU1075CT
Rev. 1.2
08/01/02
www.irf.com
1
IRU1075
ABSOLUTE MAXIMUM RATINGS
Input Voltage (VIN) .................................................... 7V
Power Dissipation ..................................................... Internally Limited
Storage Temperature Range ...................................... -65°C To 150°C
Operating Junction Temperature Range .....................
0°C To 150°C
PACKAGE INFORMATION
3-PIN PLASTIC TO-220 (T)
3-PIN PLASTIC TO-263 (M)
3-PIN PLASTIC ULTRA THIN-PAKTM (P)
FRONT VIEW
FRONT VIEW
FRONT VIEW
Tab is
VOUT
3
2
1
VIN
3
2
1
3
2
1
V IN
VIN
Tab is
V OUT
Tab is
VOUT
VOUT
Adj
V OUT
Adj
VOUT
Adj
qJT=2.7°C/W qJA=60°C/W
qJA=35°C/W for 1" Square pad
qJA=35°C/W for 1" Square pad
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications apply over CIN=1µF, COUT=10µF, and TJ=0 to 1508C.
Typical values refer to TJ=258C.
PARAMETER
SYM
TEST CONDITION
MIN
TYP
MAX UNITS
Reference Voltage
VREF Io=10mA, TJ=258C, (VIN-Vo)=1.5V
Io=10mA, (VIN-Vo)=1.5V
Io=10mA, 1.3V<(VIN-Vo)<7V
VIN=3.3V, VADJ=0, 10mA<Io<7.5A
∆VO Io=7.5A
1.238 1.250 1.262
1.225 1.250 1.275
V
Line Regulation
Load Regulation (Note 1)
Dropout Voltage (Note 2)
0.2
0.4
%
%
V
1.0
0.92
9
1.2
1.1
Io=4A
VIN=3.3V, ∆Vo=100mV
VIN=3.3V, VADJ=0V
Current Limit
7.6
60
A
mA
Minimum Load Current (Note 3)
Thermal Regulation
Ripple Rejection
5
10
30ms Pulse, VIN-Vo=3V, Io=7.5A
f=120Hz, Co=25µF Tantalum,
Io=7.5A, VIN-Vo=3V
0.02
%/W
70
dB
Adjust Pin Current
IADJ
Io=10mA, VIN-Vo=1.5V, TJ=258C,
Io=10mA, VIN-Vo=1.5V
55
0.2
120
5
µA
µA
%
Adjust Pin Current Change
Temperature Stability
Long Term Stability
Io=10mA, VIN-Vo=1.5V, TJ=258C
VIN=3.3V, VADJ=0V, Io=10mA
TJ=1258C, 1000Hrs
0.5
0.3
%
RMS Output Noise
TJ=258C, 10Hz<f<10KHz
0.003
%VO
Note 1: Low duty cycle pulse testing with Kelvin con- Note 3: Minimum load current is defined as the mini-
nections is required in order to maintain accurate data. mum current required at the output in order for the out-
put voltage to maintain regulation. Typically the resistor
Note 2: Dropout voltage is defined as the minimum dif- dividers are selected such that it automatically main-
ferential voltage between VIN and VOUT required to main- tains this current.
tain regulation at VOUT. It is measured when the output
voltage drops 1% below its nominal value.
Rev. 1.2
08/01/02
www.irf.com
2
IRU1075
PIN DESCRIPTIONS
PIN # PIN SYMBOL
PIN DESCRIPTION
1
2
Adj
A resistor divider from this pin to the VOUT pin and ground sets the output voltage.
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
+
+
1.25V
CURRENT
LIMIT
THERMAL
SHUTDOWN
1 Adj
Figure 2 - Simplified block diagram of the IRU1075.
APPLICATION INFORMATION
Introduction
The IRU1075 adjustable Low Dropout (LDO) regulator nanoseconds at the processor pins, which translates to
is a three-terminal device which can easily be pro- an approximately 300 to 500ns current step at the regu-
grammed with the addition of two external resistors to lator. In addition, the output voltage tolerances are also
any voltages within the range of 1.25 to 5.5 V. This regu- extremely tight and they include the transient response
lator unlike the first generation of the three-terminal regu- as part of the specification. For example Intel VREä
lators such as LM117 that required 3V differential be- specification calls for a total of ±100mV including initial
tween the input and the regulated output, only needs tolerance, load regulation and 0 to 4.6A load step.
1.3V differential to maintain output regulation. This is a
key requirement for today’s microprocessors that need The IRU1075 is specifically designed to meet the fast
typically 3.3V supply and are often generated from the current transient needs as well as providing an accurate
5V supply. Another major requirement of these micro- initial voltage, reducing the overall system cost with the
processors such as the Intel P54Cä is the need to switch need for fewer output capacitors.
the load current from zero to several amps in tens of
Rev. 1.2
08/01/02
www.irf.com
3
IRU1075
Output Voltage Setting
regulator and the load is gained up by the factor of (1+R2/
The IRU1075 can be programmed to any voltages in the R1), or the effective resistance will be, RP(eff)=RP×(1+R2/
range of 1.25V to 5.5V with the addition of R1 and R2 R1). It is important to note that for high current applica-
external resistors according to the following formula:
tions, this can represent a significant percentage of the
overall load regulation and one must keep the path from
the regulator to the load as short as possible to mini-
mize this effect.
R2
R1
VOUT = VREF× 1+
+IADJ×R2
( )
Where:
PARASITIC LINE
RESISTANCE
VREF = 1.25V Typically
IADJ = 50µA Typically
R1 and R2 as shown in Figure 3:
RP
VOUT
VIN
VIN
IRU1075
VOUT
VIN
VIN
VOUT
Adj
RL
R1
R2
IRU1075
Adj
R 1
R 2
VREF
IADJ = 50uA
Figure 4 - Schematic showing connection
for best load regulation.
Figure 3 - Typical application of the IRU1075
for programming the output voltage.
Stability
The IRU1075 keeps a constant 1.25V between the out- The IRU1075 requires the use of an output capacitor as
put pin and the adjust pin. By placing a resistor R1 across part of the frequency compensation in order to make the
these two pins a constant current flows through R1, add- regulator stable. Typical designs for microprocessor ap-
ing to the IADJ current and into the R2 resistor producing plications use standard electrolytic capacitors with a
a voltage equal to the (1.25/R1)×R2 + IADJ×R2 which typical ESR in the range of 50 to 100 mΩ and an output
will be added to the 1.25V to set the output voltage. capacitance of 500 to 1000µF. Fortunately as the ca-
This is summarized in the above equation. Since the pacitance increases, the ESR decreases resulting in a
minimum load current requirement of the IRU1075 is fixed RC time constant. The IRU1075 takes advantage
10mA, R1 is typically selected to be 121Ω resistor so of this phenomena in making the overall regulator loop
that it automatically satisfies the minimum current re- stable. For most applications a minimum of 100µF alu-
quirement. Notice that since IADJ is typically in the range minum electrolytic capacitor such as Sanyo MVGX se-
of 50µA it only adds a small error to the output voltage ries, Panasonic FA series as well as the Nichicon PL
and should only be considered when a very precise out- series insures both stability and good transient response.
put voltage setting is required. For example, in a typical
3.3V application where R1=121Ω and R2=200Ω the er- Thermal Design
ror due to IADJ is only 0.3% of the nominal set point.
The IRU1075 incorporates an internal thermal shutdown
that protects the device when the junction temperature
exceeds the maximum allowable junction temperature.
Load Regulation
Since the IRU1075 is only a three-terminal device, it is Although this device can operate with junction tempera-
not possible to provide true remote sensing of the output tures in the range of 1508C, it is recommended that the
voltage at the load. Figure 4 shows that the best load selected heat sink be chosen such that during maxi-
regulation is achieved when the bottom side of R2 is mum continuous load operation the junction tempera-
connected to the load and the top side of R1 resistor is ture is kept below this number. The example below
connected directly to the case or the VOUT pin of the shows the steps in selecting the proper regulator heat
regulator and not to the load. In fact, if R1 is connected sink for the worst case current consumption using Intel
to the load side, the effective resistance between the 200MHz microprocessor as the load.
Rev. 1.2
08/01/02
www.irf.com
4
IRU1075
Assuming the following specifications:
4) With the maximum heat sink temperature calculated
in the previous step, the heat-sink-to-air thermal re-
sistance (θSA) is calculated by first calculating the
temperature rise above the ambient as follows:
VIN = 5V
VOUT = 3.5V
IOUT(MAX) = 4.6A
TA = 358C
∆T = TS - TA = 116 - 35 = 818C
DT = Temperature Rise Above Ambient
∆T 81
The steps for selecting a proper heat sink to keep the
junction temperature below 135°C is given as:
θSA =
=
= 11.78C/W
PD
6.9
1) Calculate the maximum power dissipation using:
5) Next, a heat sink with lower θSA than the one calcu-
lated in Step 4 must be selected. One way to do this
is to simply look at the graphs of the “Heat Sink Temp
Rise Above the Ambient” vs. the “Power Dissipation”
and select a heat sink that results in lower tempera-
ture rise than the one calculated in previous step.
The following heat sinks from AAVID and Thermalloy
meet this criteria.
PD = IOUT×(VIN - VOUT)
PD = 4.6×(5 - 3.5) = 6.9W
2) Select a package from the regulator data sheet and
record its junction to case (or tab) thermal resistance.
Selecting TO-220 package gives us:
qJC = 2.78C/W
Air Flow (LFM)
3) Assuming that the heat sink is black anodized, cal-
culate the maximum heat sink temperature allowed:
0
100
200
300
400
Thermalloy
AAVID
6021PB 6021PB 6073PB 6109PB 7141D
534202B 534202B 507302 575002 576802B
Assume, θcs = 0.05°C/W (heat-sink-to-case ther-
mal resistance for black anodized)
TS = TJ - PD×(θJC + θCS)
TS = 135 - 6.9×(2.7 + 0.05) = 1168C
IR WORLD HEADQUARTERS:233 Kansas St., El Segundo, California 90245, USA Tel: (310) 252-7105
TAC Fax: (310) 252-7903
Visit us at www.irf.com for sales contact information
Data and specifications subject to change without notice. 02/01
Rev. 1.2
08/01/02
www.irf.com
5
IRU1075
(M) TO-263 Package
3-Pin
A
E
U
K
S
V
B
M
H
L
P
D
G
N
R
C
C
L
SYMBOL
MIN
MAX
A
B
C
D
E
G
H
K
L
10.05 10.312
8.28
4.31
0.66
1.14
8.763
4.572
0.91
1.40
2.54 REF
14.73 15.75
1.40
0.00
2.49
0.33
1.68
0.254
2.74
M
N
P
R
S
U
V
0.58
2.286 2.794
08
88
2.41
2.67
6.50 REF
7.75 REF
NOTE: ALL MEASUREMENTS
ARE IN MILLIMETERS.
Rev. 1.2
08/01/02
www.irf.com
6
IRU1075
(P) Ultra Thin-PakTM
3-Pin
A
A1
U
E
K
B
V
H
M
L
P
G
D
N
C
R
C
L
SYMBOL
MIN
9.27
8.89
7.87
1.78
0.63
MAX
9.52
9.14
8.13
2.03
0.79
A
A1
B
C
D
E
0.25 NOM
2.54
G
H
K
10.41 10.67
0.76
0.03
0.89
1.27
0.13
1.14
L
M
N
P
0.25
0.79
1.04
R
U
V
38
68
5.59 NOM
7.49 NOM
NOTE: ALL MEASUREMENTS
ARE IN MILLIMETERS.
Rev. 1.2
08/01/02
www.irf.com
7
IRU1075
(T) TO-220 Package
3-Pin
H1
Q
L
b1
e3
e
e1
C
L E
b
R
E-PIN
CP
a (5x)
C1
J1
A
C
L
F
D
SYMBOL
MIN
4.06
38
MAX
A
a
4.83
7.58
b
0.63
1.14
0.38
1.02
1.52
0.56
b1
C1
CP
D
3.71D 3.96D
14.22 15.062
E
9.78
2.29
4.83
1.14
1.14
5.94
2.29
10.54
2.79
5.33
1.40
1.40
6.55
2.92
e
e1
e3
F
H1
J1
L
13.716 14.22
Q
2.62
2.87
6.17
R
5.588
NOTE: ALL MEASUREMENTS
ARE IN MILLIMETERS.
Rev. 1.2
08/01/02
www.irf.com
8
IRU1075
PACKAGE SHIPMENT METHOD
PKG
PACKAGE
PIN
PARTS
PARTS
T & R
DESIG
DESCRIPTION
COUNT
PER TUBE
PER REEL
Orientation
M
P
T
TO-263
Ultra Thin-PakTM
3
3
3
50
75
50
750
2500
---
Fig A
Fig B
---
TO-220
1
1
1
1
1
1
Feed Direction
Figure A
Feed Direction
FigureB
IR WORLD HEADQUARTERS:233 Kansas St., El Segundo, California 90245, USA Tel: (310) 252-7105
TAC Fax: (310) 252-7903
Visit us at www.irf.com for sales contact information
Data and specifications subject to change without notice. 02/01
Rev. 1.2
08/01/02
www.irf.com
9
相关型号：
IRU1075CTPBF
Adjustable Positive LDO Regulator, 1.25V Min, 5.5V Max, 1.2V Dropout, PSFM3, PLASTIC, TO-220, 3 PIN
INFINEON
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