IRU1150 [INFINEON]
4A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR; 4A超低压差正可调稳压
| 型号： | IRU1150 |
| 厂家： | 
Infineon |
| 描述： | 4A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR |
| 文件： | 总6页 (文件大小：47K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Data Sheet No. PD94129
IRU1150
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
118
V
SENSE
5V
C2
100uF
Figure 1 - Typical application of IRU1150 in a 3.3V to 2.7V for I740 chip.
PACKAGE ORDER INFORMATION
TJ (°C)
5-PIN PLASTIC
5-PIN PLASTIC
Ultra Thin-PakTM (P)
8-PIN PLASTIC
SOIC (S)
TO-263 (M)
0 To 125
IRU1150CM
IRU1150CP
IRU1150CS
Rev. 1.6
03/18/02
www.irf.com
1
IRU1150
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
4
3
2
1
4
3
2
1
V
V
Tab is
VOUT
Tab is
VOUT
VIN
V
V
V
Adj
V
Adj
Adj
VSENSE
VOUT
VSENSE
VSENSE
qJA=35°C/W for 0.5" square pad
qJA=35°C/W for 0.5" square pad
qJA=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 1258C.
Typical values refer to TJ=258C. VOUT=VSENSE.
PARAMETER
Reference Voltage
SYM TEST CONDITION
MIN
TYP
MAX
UNITS
V
VREF
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
1.225 1.250 1.275
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
VIN=2.05V, Io=3A
VIN=2.05V, Io=4A
Dropout Voltage (Note 2)
(VCTRL - VOUT)
1.00
1.05
1.13
1.15
1.15
1.20
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
70
6
A
mA
%/W
dB
Minimum Load Current (Note 3)
Thermal Regulation
VCTRL=5V, VIN=3.3V, VADJ=0V
30ms Pulse
10
Ripple Rejection
VCTRL=5V, VIN=5V, Io=4A, VADJ=0V
TJ=258C, 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
Control Pin Current
16
36
67
50
25
50
85
mA
Adjust Pin Current
IADJ
µA
Rev. 1.6
03/18/02
www.irf.com
2
IRU1150
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)
Rev. 1.6
03/18/02
www.irf.com
3
IRU1150
BLOCK DIAGRAM
V
IN
5
3 VOUT
V
CTRL
V
SENSE
4
1
+
+
1.25V
CURRENT
LIMIT
THERMAL
SHUTDOWN
2
Adj
Figure 2 - Simplified block diagram of the IRU1150.
APPLICATION INFORMATION
Introduction
The IRU1150 adjustable regulator is a five-terminal de- need for fewer number of output capacitors. Another fea-
vice designed specifically to provide extremely low drop- ture of the device is its true remote sensing capability
out voltages comparable to the PNP type without the which allows accurate voltage setting at the load rather
disadvantage of the extra power dissipation due to the than at the device.
base current associated with PNP regulators. This is
done by bringing out the control pin of the regulator that Output Voltage Setting
provides the base current to the power NPN and con- The IRU1150 can be programmed to any voltages in the
necting it to a voltage that is grater than the voltage present range of 1.25V to 5.5V with the addition of R1 and R2
at the VIN pin. This flexibility makes the IRU1150 ideal external resistors according to the following formula:
for applications where dual inputs are available such as
VOUT = VREF × o 1 + R2p + IADJ × R2
a computer mother board with an ATX style power sup-
ply that provides 5V and 3.3V to the board. One such
R1
application is the new graphic chip sets that require any- Where:
where from 2.4V to 2.7V supply such as the Intel I740 VREF = 1.25V Typically
chip set. The IRU1150 can easily be programmed with IADJ = 50µA Typically
the addition of two external resistors to any voltages R1 and R2 as shown in Figure 3:
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
VIN
VOUT
VIN
VOUT
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.
IRU1150
VSENSE
VCTRL
VCTRL
Adj
VREF
R1
R2
IADJ = 50uA
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.
Rev. 1.6
03/18/02
www.irf.com
4
IRU1150
The IRU1150 keeps a constant 1.25V between the VSENSE For most applications a minimum of 100µF aluminum
pin and the VADJ pin. By placing a resistor R1 across electrolytic capacitor such as Sanyo, MVGX series,
these two pins and connecting the VSENSE and VOUT pin Panasonic FA series as well as the Nichicon PL series
together, a constant current flows through R1, adding to insures both stability and good transient response.
the Iadj current and into the R2 resistor producing a volt-
age equal to the (1.25/R1)×R2 + IADJ×R2. This voltage Thermal Design
is then added to the 1.25V to set the output voltage. The IRU1150 incorporates an internal thermal shutdown
This is summarized in the above equation. Since the that protects the device when the junction temperature
minimum load current requirement of the IRU1150 is exceeds the allowable maximum junction temperature.
10mA, R1 is typically selected to be a 121Ω resistor so Although this device can operate with junction tempera-
that it automatically satisfies this condition. Notice that tures in the range of 1508C, it is recommended that the
since the IADJ is typically in the range of 50µA it only selected heat sink be chosen such that during maxi-
adds a small error to the output voltage and should be mum continuous load operation the junction tempera-
considered when very precise output voltage setting is ture is kept below this number. The example below
required.
shows the steps in selecting the proper surface mount
package.
Load Regulation
Since the IRU1150 has separate pins for the output (VOUT) Assuming, the following conditions:
and the sense (VSENSE), it is ideal for providing true re-
VOUT = 2.7V
mote sensing of the output voltage at the load. This
VIN = 3.3V
means that the voltage drops due to parasitic resistance
VCTRL = 5V
such as PCB traces between the regulator and the load
IOUT = 2A (DC Avg)
are compensated for using remote sensing. Figure 4
shows a typical application of the IRU1150 with remote Calculate the maximum power dissipation using the fol-
sensing.
lowing equation:
PD = IOUT × (VIN - VOUT) +o IOUT p × (VCTRL - VOUT)
60
VOUT
VIN
Vin
IRU1150
2
60
PD = 2 × (3.3 - 2.7) +o p × (5 - 2.7) = 1.28W
VSENSE
VCTRL
VCTRL
RL
Adj
R 1
R 2
Using table below select the proper package and the
amount of copper board needed.
Pkg
Copper
Area
qJA(°C/W)
Max Pd
(TA=25°C)
4.4W
3.7W
3.1W
Max Pd
(TA=45°C)
3.6W
TO-263 1.4"X1.4"
TO-263 1.0"X1.0"
TO-263 0.7"X0.7"
TO-263 Pad Size
SO-8 1.0"X1.0"
25
30
35
45
55
Figure 4 - Schematic showing connection
for best load regulation.
3.0W
2.6W
2.0W
1.63W
2.4W
2.0W
Stability
The IRU1150 requires the use of an output capacitor as
part of the frequency compensation in order to make the Note: Above table is based on the maximum junction
regulator stable. Typical designs for the microprocessor temperature of 1358C.
applications use standard electrolytic capacitors with
typical ESR in the range of 50 to 100mΩ and an output As shown in the above table, any of the two packages
capacitance of 500 to 1000µF. Fortunately as the ca- will do the job. For low cost applications the SO-8 pack-
pacitance increases, the ESR decreases resulting in a age is recommended.
fixed RC time constant. The IRU1150 takes advantage
of this phenomena in making the overall regulator loop
stable.
Rev. 1.6
03/18/02
www.irf.com
5
IRU1150
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. 1.6
03/18/02
www.irf.com
6
相关型号：
IRU1150CMTR
Adjustable Positive LDO Regulator, 1.25V Min, 5.5V Max, 1.15V Dropout, BIPolar, PSSO5, PLASTIC, TO-263, 5 PIN
INFINEON
IRU1150CPTR
Adjustable Positive LDO Regulator, 1.25V Min, 5.5V Max, 1.15V Dropout, BIPolar, PSSO5, PLASTIC, ULTRA THIN PACKAGE-5
INFINEON
IRU1150CSPBF
Adjustable Positive LDO Regulator, 1.25V Min, 5.5V Max, 1.15V Dropout, BIPolar, PDSO8, LEAD FREE, PLASTIC, SOIC-8
INFINEON
IRU1150CSTR
Adjustable Positive LDO Regulator, 1.25V Min, 5.5V Max, 1.15V Dropout, BIPolar, PDSO8, PLASTIC, SOIC-8
INFINEON
IRU1150CSTRPBF
Adjustable Positive LDO Regulator, 1.25V Min, 5.5V Max, 1.15V Dropout, BIPolar, PDSO8, LEAD FREE, PLASTIC, SOIC-8
INFINEON
IRU1160CMPBF
Adjustable Positive LDO Regulator, 1.25V Min, 5.5V Max, 0.62V Dropout, BIPolar, PSSO5, PLASTIC, TO-263, 5 PIN
INFINEON
©2020 ICPDF网 联系我们和版权申明