IRU1150CSPBF [INFINEON]
Adjustable Positive LDO Regulator, 1.25V Min, 5.5V Max, 1.15V Dropout, BIPolar, PDSO8, LEAD FREE, PLASTIC, SOIC-8;
| 型号： | IRU1150CSPBF |
| 厂家： | 
Infineon |
| 描述： | Adjustable Positive LDO Regulator, 1.25V Min, 5.5V Max, 1.15V Dropout, BIPolar, PDSO8, LEAD FREE, PLASTIC, SOIC-8 光电二极管 输出元件 调节器 |
| 文件： | 总9页 (文件大小：141K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Data Sheet No. PD94129 revA
IRU1150(PbF)
4A ULTRA LOW DROPOUT POSITIVE
ADJUSTABLE REGULATOR
DESCRIPTION
FEATURES
0.7V Dropout at 4A
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.
Fast Transient Response
1% Voltage Reference Initial Accuracy
Built-In Thermal Shutdown
APPLICATIONS
3.3V to 2.7V Intel I740 Chip Set
TYPICAL APPLICATION
3.3V
C1
100uF
V
IN
5
4
3
2
1
V
CTRL
V
OUT
2.7V
IRU1150
R1
102
C3
Adj
100uF
R2
V
SENSE
118
5V
C2
100uF
Figure 1 - Typical application of IRU1150 in a 3.3V to 2.7V for I740 chip.
PACKAGE ORDER INFORMATION
Basic Part (Non-Lead Free)
TJ (°C)
5-PIN PLASTIC
5-PIN PLASTIC
8-PIN PLASTIC
SOIC (S)
TM
TO-263 (M)
Ultra Thin-Pak (P)
0 To 125
IRU1150CM
IRU1150CP
IRU1150CS
Leadfree Part
5-PIN PLASTIC
Ultra Thin-PakTM (P)
Not available
TJ (°C)
5-PIN PLASTIC
TO-263 (M)
8-PIN PLASTIC
SOIC (S)
0 To 125
Not available
IRU1150CSPbF
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1
IRU1150(PbF)
ABSOLUTE MAXIMUM RATINGS
Input Voltage (VIN) .................................................... 7V
Control Input Voltage (VCTRL) ..................................... 14V
Power Dissipation ..................................................... Internally Limited
Storage Temperature Range ...................................... -65°C To 150°C
Operating Junction Temperature Range ..................... 0°C To 150°C
PACKAGE INFORMATION
5-PIN PLASTIC TO-263 (M)
5-PIN PLASTIC ULTRA THIN-PAKTM (P)
8-PIN PLASTIC SOIC (S)
FRONT VIEW
5
FRONT VIEW
5
TOP VIEW
V
IN
CTRL
OUT
V
IN
CTRL
OUT
1
2
3
4
8
7
6
5
V
CTRL
V
OUT
OUT
OUT
OUT
4
3
2
1
4
3
2
1
V
V
Tab is
Tab is
V
IN
V
V
V
Adj
VOUT
VOUT
Adj
V
V
Adj
V
SENSE
VSENSE
VSENSE
θJA=35°C/W for 0.5" square pad
θJA=35°C/W for 0.5" square pad
θJA=55°C/W for 1" Sq pad area
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications apply over CIN=1µF, COUT=10µF, and TJ=0 to 125ꢀC.
Typical values refer to TJ=25ꢀC. VOUT=VSENSE.
PARAMETER
SYM
TEST CONDITION
VCTRL=2.7 to 12V, VIN=2.05V to 5.5V,
Io=10mA to 4A, VADJ=0V
VCTRL=2.5V to 7V, VIN=1.75V to 5.5V,
Io=10mA, VADJ=0V
MIN
TYP MAX UNITS
Reference Voltage
VREF
1.225 1.250 1.275
V
Line Regulation
-5
-5
-0.2
3
+5
+5
mV
mV
V
Load Regulation (Note 1)
VCTRL=2.75V, VIN=2.1V,
Io=10mA to 4A, VADJ=0V
VADJ=0V for all conditions below:
VIN=2.05V, Io=1.5A
Dropout Voltage (Note 2)
(VCTRL - VOUT)
1.00
1.05
1.13
1.15
1.15
1.20
VIN=2.05V, Io=3A
VIN=2.05V, Io=4A
Dropout Voltage (Note 2)
(VIN - VOUT)
VADJ=0V for all conditions below:
VCTRL=2.75V, Io=1.5A
0.26
0.50
0.70
0.38
0.60
1.15
V
VCTRL=2.75V, Io=3A
VCTRL=2.75V, Io=4A
Current Limit
VCTRL=2.75V, VIN=2.05V,
∆Vo=100mV, VADJ=0V
4.2
4.65
1
0.01
6
10
A
Minimum Load Current (Note 3)
Thermal Regulation
Ripple Rejection
VCTRL=5V, VIN=3.3V, VADJ=0V
30ms Pulse
mA
%/W
VCTRL=5V, VIN=5V, Io=4A, VADJ=0V,
TJ=25ꢀC, VRIPPLE=1VPP at 120Hz
VADJ=0V for all below conditions:
VCTRL=2.75V, VIN=2.05V, Io=1.5A
VCTRL=2.75V, VIN=2.05V, Io=3A
VCTRL=2.75V, VIN=2.05V, Io=4A
VCTRL=2.75V, VIN=2.05V, VADJ=0V
70
dB
Control Pin Current
16
36
67
50
25
50
85
mA
Adjust Pin Current
IADJ
µA
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2
IRU1150(PbF)
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 between VIN and VOUT required to maintain regu- tains this current.
lation at VOUT. It is measured when the output voltage
drops 1% below its nominal value.
PIN DESCRIPTIONS
PIN # PIN SYMBOL PIN DESCRIPTION
1
VSENSE
This pin is the positive side of the reference which allows remote load sensing to achieve
excellent load regulation.
2
3
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.
4
5
VCTRL
VIN
This pin is the supply pin for the internal control circuitry as well as the base drive for the
pass transistor. This pin must always be higher than the VOUT pin in order for the device to
regulate. (See specifications)
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 higher than VOUT in
order for the device to regulate. (See specifications)
BLOCK DIAGRAM
5
3
VIN
VOUT
VCTRL
4
1 VSENSE
+
+
1.25V
CURRENT
LIMIT
THERMAL
SHUTDOWN
2
Adj
Figure 2 - Simplified block diagram of the IRU1150.
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3
IRU1150(PbF)
APPLICATION INFORMATION
V
IN
VIN
VOUT
Introduction
VOUT
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-
IRU1150
V
SENSE
V
CTRL
VCTRL
Adj
V
REF
R1
R2
I
ADJ = 50uA
Figure 3 - Typical application of the IRU1150
for programming the output voltage.
ply that provides 5V and 3.3V to the board. One such The IRU1150 keeps a constant 1.25V between the VSENSE
application is the new graphic chip sets that require any- pin and the VADJ pin. By placing a resistor R1 across
where from 2.4V to 2.7V supply such as the Intel I740 these two pins and connecting the VSENSE and VOUT pin
chip set. The IRU1150 can easily be programmed with together, a constant current flows through R1, adding to
the addition of two external resistors to any voltages the Iadj current and into the R2 resistor producing a volt-
within the range of 1.25 to 5.5 V. Another major require- age equal to the (1.25/R1)×R2 + IADJ×R2. This voltage
ment of these graphic chips such as the Intel I740 is the is then added to the 1.25V to set the output voltage.
need to switch the load current from zero to several amps This is summarized in the above equation. Since the
in tens of nanoseconds at the processor pins, which minimum load current requirement of the IRU1150 is
translates to an approximately 300 to 500ns of current 10mA, R1 is typically selected to be a 121Ω resistor so
step at the regulator. In addition, the output voltage tol- that it automatically satisfies this condition. Notice that
erances are also extremely tight and they include the since the IADJ is typically in the range of 50µA it only
transient response as part of the specification.
adds a small error to the output voltage and should be
considered when very precise output voltage setting is
The IRU1150 is specifically designed to meet the fast required.
current transient needs as well as providing an accurate
initial voltage, reducing the overall system cost with the Load Regulation
need for fewer number of output capacitors. Another fea- Since the IRU1150 has separate pins for the output (VOUT)
ture of the device is its true remote sensing capability and the sense (VSENSE), it is ideal for providing true re-
which allows accurate voltage setting at the load rather mote sensing of the output voltage at the load. This
than at the device.
means that the voltage drops due to parasitic resistance
such as PCB traces between the regulator and the load
are compensated for using remote sensing. Figure 4
Output Voltage Setting
The IRU1150 can be programmed to any voltages in the shows a typical application of the IRU1150 with remote
range of 1.25V to 5.5V with the addition of R1 and R2 sensing.
external resistors according to the following formula:
V
OUT
V
IN
Vin
R2
VOUT = VREF× 1+
+IADJ×R2
( )
R1
IRU1150
V
SENSE
V
CTRL
VCTRL
Where:
RL
Adj
VREF = 1.25V Typically
R1
R2
IADJ = 50µA Typically
R1 and R2 as shown in Figure 3:
Figure 4 - Schematic showing connection
for best load regulation.
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4
IRU1150(PbF)
Stability
Assuming, the following conditions:
The IRU1150 requires the use of an output capacitor as
part of the frequency compensation in order to make the
regulator stable. Typical designs for the microprocessor
applications use standard electrolytic capacitors with
typical ESR in the range of 50 to 100mΩ and an output
VOUT = 2.7V
VIN = 3.3V
VCTRL = 5V
IOUT = 2A (DC Avg)
capacitance of 500 to 1000µF. Fortunately as the ca- Calculate the maximum power dissipation using the fol-
pacitance increases, the ESR decreases resulting in a lowing equation:
fixed RC time constant. The IRU1150 takes advantage
IOUT
of this phenomena in making the overall regulator loop
stable.
PD = IOUT×(VIN - VOUT)+
×(VCTRL - VOUT)
( 60 )
2
PD = 2×(3.3 - 2.7)+
×(5 - 2.7) = 1.28W
(60)
For most applications a minimum of 100µF aluminum
electrolytic capacitor such as Sanyo, MVGX series,
Panasonic FA series as well as the Nichicon PL series Using table below select the proper package and the
insures both stability and good transient response.
amount of copper board needed.
Thermal Design
Pkg
Copper θJA(°C/W)
Max Pd Max Pd
The IRU1150 incorporates an internal thermal shutdown
Area
(TA=25°C)
4.4W
(TA=45°C)
3.6W
that protects the device when the junction temperature TO-263 1.4"X1.4"
exceeds the allowable maximum junction temperature. TO-263 1.0"X1.0"
Although this device can operate with junction tempera- TO-263 0.7"X0.7"
tures in the range of 150ꢀC, it is recommended that the TO-263 Pad Size
selected heat sink be chosen such that during maxi- SO-8 1.0"X1.0"
mum continuous load operation the junction tempera-
25
30
35
45
55
3.7W
3.0W
3.1W
2.6W
2.4W
2.0W
2.0W
1.63W
ture is kept below this number. The example below Note: Above table is based on the maximum junction
shows the steps in selecting the proper surface mount temperature of 135ꢀC.
package.
As shown in the above table, any of the two packages
will do the job. For low cost applications the SOIC 8-pin
package is recommended.
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5
IRU1150(PbF)
(M) TO-263 Package
5-Pin
A
E
U
K
S
V
B
M
H
L
P
G
D
N
R
C
C
L
SYMBOL
MIN
MAX
A
B
C
D
E
G
H
K
L
M
N
P
R
S
U
V
10.05 10.668
8.28
4.31
0.66
1.14
1.575 1.829
14.605 15.875
1.143
0.00
2.49
0.33
2.286 2.794
0ꢀ
1.143
6.50 REF
9.169
4.597
0.91
1.40
1.68
0.305
2.74
0.58
8ꢀ
2.67
7.75 REF
NOTE: ALL MEASUREMENTS
ARE IN MILLIMETERS.
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6
IRU1150(PbF)
(P) Ultra Thin-PakTM
5-Pin
A
A1
E
U
K
B
V
H
M
L
P
R
G
D
N
C
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
G
H
K
1.72
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
3ꢀ
6ꢀ
5.59 NOM
7.49 NOM
NOTE: ALL MEASUREMENTS
ARE IN MILLIMETERS.
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7
IRU1150(PbF)
(S) SOIC Package
8-Pin Surface Mount, Narrow Body
H
A
B
C
E
DETAIL-A
L
D
PIN NO. 1
DETAIL-A
I
0.38±
0.015 x 45
ꢀ
K
T
F
J
G
8-PIN
MIN
SYMBOL
MAX
A
B
C
D
E
F
G
H
I
4.80
4.98
1.27 BSC
0.53 REF
0.36
0.46
3.99
1.72
0.25
3.81
1.52
0.10
7ꢀ BSC
0.19
5.80
0ꢀ
0.41
1.37
0.25
6.20
8ꢀ
1.27
1.57
J
K
L
T
NOTE: ALL MEASUREMENTS ARE IN MILLIMETERS.
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8
IRU1150(PbF)
PACKAGE SHIPMENT METHOD
PKG
PACKAGE
PIN
PARTS
PARTS
PER REEL
750
T & R
Orientation
Fig A
DESIG
DESCRIPTION
COUNT
PER TUBE
M
P
S
TO-263
5
5
8
50
75
95
Ultra Thin-PakTM
SOIC, Narrow Body
2500
2500
Fig B
Fig C
1
1
1
1
1
1
Feed Direction
Figure B
Feed Direction
Figure A
1
1
1
Feed Direction
Figure C
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. 8/18/2005
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