AP1184T518L-U [DIODES]
4A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR FIXED-MODE REGULATOR; 4A超低压差正可调或固定模式稳压器
| 型号： | AP1184T518L-U |
| 厂家： | 
DIODES INCORPORATED |
| 描述： | 4A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR FIXED-MODE REGULATOR |
| 文件： | 总12页 (文件大小：270K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AP1184
4A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR
FIXED-MODE REGULATOR
General Description
Features
AP1184 is a 4A regulator with extremely low dropout voltage.
This product is specifically designed to provide well regulated
supply for applications requiring 2.8V or lower voltages from 3.3V
ATX power supplies where high efficiency of the switch can be
achieved without the cost and complexity associated with
switching regulator. One such application is the new graphic
chipsets that requires anywhere from 2.4V to 2.7V supply.
•
•
•
•
0.85V maximum dropout voltage at 4A load current
Built-in Thermal shutdown
Output current limiting
Adjustable or fixed output voltage1.5V, 1.8V, 2.5V,
3.3V, 5.0V
Fast transient response
•
•
•
•
Good noise rejection
Packages: TO220-5L and TO263-5L
Lead Free Finish/RoHS Compliant for Lead Free
products (Note 1)
Ordering Information
XX
XX X X
AP1184
-
Package
Vout
Lead Free
L : Lead Free
Packing
K5 : TO263-5L
T5 : TO220-5L
-U : Tube
-13 : Taping
Blank : Adj
15 = 1.5V
18 = 1.8V
25 = 2.5V
33 = 3.3V
50 = 5.0V
Tube/Bulk
13” Tape and Reel
Package Packaging
Device
Part Number
Part Number
Code
(Note 2)
Quantity
Quantity
Suffix
Suffix
AP1184K5
AP1184T5
K5
T5
TO263-5L
TO220-5L
50
50
-U
-U
800/Tape & Reel
NA
-13
NA
Lead-free
Lead-free
Notes:
1. RoHS revision 13.2.2003. Glass and high temperature solder exemptions applied, see EU Directive Annex Notes 5 and 7.
2. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at
http://www.diodes.com/datasheets/ap02001.pdf.
AP1184 Rev. 4
1 of 12
MARCH 2008
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AP1184
4A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR
FIXED-MODE REGULATOR
Pin Assignments
FRONT VIEW
FRONT VIEW
Vin
5
4
3
2
1
Vin
5
Vctrl
4
Vctrl
3
Vout
Vout
Adj(GND)
Vsense
Adj(GND)
Vsense
2
1
Tab is Vout
Tab is Vout
TO220-5L
TO263-L
Pin Descriptions
Pin Numbers with standard type are for TO220-5L, TO263-5L packages.
Name
Adj
(GND)
I/O
Description
A resistor divider from this pin to the Vout pin and ground sets the output voltage. (GND
only for fixed mode)
This pin is the positive side of the reference that allows remote load sensing to achieve
excellent load regulation. A minimum of 10uF capacitor must be connected from this pin
to ground to insure stability.
The input 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 Vout in
order for the device to regulate.
Vsense
Vin
I
I
This pin is the supply pin for the internal control circuit as well as the base drive for the
pass transistor. This pin must always be higher than the Vout pin in order to regulate the
device. A minimum of 100uF capacitor must be connected from this pin to ground to
insure stability.
Vctrl
I
NC
No connection
The output of the regulator. A minimum of 100uF capacitor must be connected from this
pin to ground to insure stability.
Vout
O
AP1184 Rev. 4
2 of 12
MARCH 2008
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© Diodes Incorporated
AP1184
4A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR
FIXED-MODE REGULATOR
Block Diagram
Vin
Vout
Vsense
Vctrl
+
+
+
1.25V
+
-
CURRENT
LIMIT
THERMAL
SHUTDOWN
Adj
Typical Application Circuit
3.3V
+
.
470uF
GND
NC
Vsense
Vout
2.5V/4A
5V
Vctrl
Vin
Vout
Vin
+
+
470uF
470uF
AP1184-2.5V
Absolute Maximum Ratings
Symbol
Parameter
Rating
Unit
VIN
Vctrl
PD
TST
TOP
Input Voltage
Control Input voltage
Power dissipation
Storage temperature Range
Operation Junction Temperature Range
16
18
V
V
Internally limited
-65 to +150
0 to +125
oC
oC
AP1184 Rev. 4
3 of 12
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MARCH 2008
© Diodes Incorporated
AP1184
4A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR
FIXED-MODE REGULATOR
Electrical Characteristics ( Under Operating Conditions )
Unless otherwise specified, these specifications apply over, C = 1uF, C = 10uF, and T = 0 to 150oC. Typical value refer to T = 25oC.
in
out
j
A
V
= V
sense
out
Sym.
Parameter
Test Condition
Min. Typ. Max. Unit
Io =10mA, TA = 25oC, (Vin-Vout) = 0.7V,
Vctrl = VIN+1V
VREF Reference Voltage AP1184-Adj
1.225 1.250 1.275
V
IO = 10mA, VOUT+0.7V<VIN<12V, TA = 25oC
Vctrl = VIN+1V
Line Regulation
AP1184-XXX
AP1184-1.5
AP1184-1.8
AP1184-2.5
AP1184-3.3
AP1184-5.0
AP1184-Adj
AP1184-1.5
AP1184-1.8
AP1184-2.5
AP1184-3.3
AP1184-5.0
0.2
%
IOUT = 10mA, TA = 25oC, 2.2V VIN 12V
Vctrl = VIN+1V
1.470 1.500 1.530
1.764 1.800 1.836
2.450 2.500 2.550
3.235 3.300 3.365
4.900 5.000 5.100
1
V
IOUT = 10mA, TA = 25oC, 2.5V VIN 12V
Vctrl = VIN+1V
V
IOUT = 10mA, TA = 25oC, 3.2V VIN 12V
Vout Output Voltage
V
V
ctrl = VIN+1V
IOUT = 10mA, TA = 25oC, 4.0V VIN 12V
Vctrl = VIN+1V
V
IOUT = 10mA, TA = 25oC, 5.7V VIN 12V
Vctrl = VIN+1V
V
0mA<Io<4A, TA= 25oC
%
(VIN - VOUT) =2V ,Vctrl = VIN + 1V
VIN = 3V, 0mA<Io<4A, TA = 25oC
Vctrl = 4V
12
15
20
26
40
15
18
25
33
50
mV
mV
mV
mV
mV
VIN = 3.3V, 0mA<Io<4A, TA = 25oC
Load
Regulation
Vctrl = 4.3V
VIN = 4V, 0mA<Io<4A, TA = 25oC
Vctrl = 5V
VIN = 5V, 0mA<Io<4A, TA = 25oC
V
ctrl = 6V
VIN = 8V, 0mA<Io<4A, TA = 25oC
Vctrl = 9V
V
adj = 0V for all conditions below.
Dropout Voltage
Vin = 2.05V, Io = 1.5A
Vin = 2.05V, Io = 3A
Vin = 2.05V, Io = 4A
Vadj = 0V for all conditions below.
Vctrl = 2.75V, Io = 1.5A
Vctrl = 2.75V, Io = 3A
1.15
1.18
1.25
V
V
(Vctrl –Vout
)
1.10
Dropout Voltage
(Vin – Vout
0.26
0.50
0.70
0.38
0.60
0.85
)
Vctrl =2.75V, Io =4A
Current Limit
Minimum Load
Current
4.2
60
A
Vctrl = 2.75V, Vin = 2.05V, ΔVo = 100mV, Vadj = 0V
Vctrl = 5V, Vin = 3.3V, Vadj = 0V
5
10
mA
Thermal Regulation 30mS Pulse
0.01
70
0.02 %/W
dB
Vctrl = 5V, Vin = 5V, Io = 4A, Vadj = 0V, Tj = 25, Vripple =1Vpp
at 120Hz
Ripple Rejection
Vadj = 0V for all conditions below.
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
6
30
33
25
60
70
Control Pin Current
mA
AP1184 Rev. 4
4 of 12
MARCH 2008
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© Diodes Incorporated
AP1184
4A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR
FIXED-MODE REGULATOR
Electrical Characteristics ( Continued )
Unless otherwise specified, these specifications apply over, C = 1uF, C = 10uF, and T = 0 to 150oC. Typical value refer to T = 25oC.
in
out
j
A
V
t = V
ou
.
sense
Sym.
Parameter
Test Condition
Min. Typ. Max. Unit
Iadj
Adjust Pin Current
50
150
µA
Vctrl = 2.75V, Vin = 2.05,Vadjj = 0
θJA
θJC
Thermal Resistance TO263-5L: Control Circuitry/Power Transistor (Note 4)
Junction-to-Ambient TO220-5L: Control Circuitry/Power Transistor (Note 5)
61
31
OC/W
OC/W
Thermal Resistance TO263-5L: Control Circuitry/Power Transistor (Note 4)
7
5
OC/W
OC/W
Junction-to-Case
TO220-5L: Control Circuitry/Power Transistor (Note 5)
Notes:
3. AP1184-ADJ incorporates an internal thermal shutdown that protects the device when the junction temperature exceeds the allowable
maximum junction temperature.
4. Test conditions for TO263-5L : Devise mounted on 2oz copper, minimum recommended pad layout , FR-4 PCB.
5. Test conditions for TO220-5L : with copper area of approximately 3in2 , 1oz.
Package
TO263-5L/TO220-5L
Max Pd.
Remarks
2.4W~4.4W With heat sink or amount of copper board needed.
Functional Descriptions
Introduction
The AP1184 regulator is a 5 terminal device designed specifically to provide extremely low dropout 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 connecting it to a voltage that is greater than the
voltage present at the Vin pin. This flexibility makes the AP1184 ideal for applications where dual inputs are available such as a computer
motherboard with an ATX style power supply that provides 5V and 3.3V to the board. One such application is the new graphic chip sets
that require anywhere from 2.4V to 2.7V supply. The AP1184 can easily be programmed with the addition of two external resistors to any
voltages within the range of 1.25V to 15.5V. Another major requirement of these graphic chips is the 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 tolerances are also extremely tight and they include the transient response as part of the
specification.
The AP1184 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 need for fewer number of output capacitors. Another feature of the device is its true remote sensing capability
that allows accurate voltage setting at the load rather than at the device.
Output Voltage Setting
The AP1184-ADJ can be programmed to any voltages in the range of 1.25V to 15.5V with the addition of R1 and R2 external resistors
according to the following formula:
AP1184 Rev. 4
5 of 12
MARCH 2008
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© Diodes Incorporated
AP1184
4A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR
FIXED-MODE REGULATOR
Functional Descriptions ( Continued )
Vout = Vref (1+R2/R1) + Iadj * R2 where : Vref = 1.25V & Iadj=50uA Typically
Vin
Vout
AP1184-ADJ
Vsense
Vctrl
Vref
R1+
R2+
Adj
Iadj=50uA
The AP1184-ADJ keeps a constant 1.25V between the Vsense pin and the Adj pin. By placing a resistor R1 across these two pins and
connecting the Vsense and Vout pin together, a constant current flows through R1, adding to the Iadj current and into the R2 resistor
producing a voltage equal to the (1.25/R1)*R2 + Iadj*R2. This voltage is then added to the 1.25V to set the output voltage. This is
summarized in the above equation. Since the minimum load current requirement of the AP1184-ADJ is 10mA, R1 is typically selected to
be a 121Ω resistor so that it automatically satisfies this condition. Notice that since the Iadj is typically in the range of 50uA it only adds a
small error to the output voltage and should be considered when very precise output voltage setting is required.
Load Regulation
Since the AP1184 has separate pins for the output (Vout) and the sense (Vsense), it is ideal for providing true remote sensing of the
output voltage at the load. This 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 following shows a typical application of the AP1184-ADJ with remote sensing.
Vin
Vin
Vout
AP1184-ADJ
Adj
Vsense
Vctrl
Vctrl
R1
R2
RL
Stability
The AP1184-XXX 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 capacitance of 100uF to 1000uF. Fortunately as the capacitance increases, the ESR decreases resulting in a fixed RC
time constant. The AP1184-XXX takes advantage of the phenomena in making the overall regulator loop stable. For most applications a
minimum of 100uF aluminum electrolytic capacitor insures both stability and good transient response.
Thermal Design
The AP1184-XXX incorporates an internal thermal shutdown that protects the device when the junction temperature exceeds the
allowable maximum junction temperature. Although this device can operate with junction temperatures in the range of 150oC, it is
recommended that the selected heat sink be chosen such that during maximum continuous load operation, the junction temperature is
kept below this number. The example below shows the steps in selecting the proper surface mount package.
AP1184 Rev. 4
6 of 12
MARCH 2008
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© Diodes Incorporated
AP1184
4A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR
FIXED-MODE REGULATOR
Functional Descriptions ( Continued )
Assuming, the following conditions:
V
V
V
= 2.5V
out
= 3.3V
in
= 5V
ctrl
I
= 2A DC Avg.
out
Calculate the maximum power dissipation using the following equation:
P = I * ( V - V ) + ( I /60) * ( V - V )
out
d
out
in out out ctrl
P = 2 * (3.3-2.5) + (2/60) * (5-2.5) = 1.68W
d
Using table below select the proper package and the amount of copper board needed.
Package
TO263-5L Pad Size-1.4”X1.4”
Copper Area
θJA (oC/W)
Max Pd (TA = 25oC) Max Pd (TA = 45oC)
2.4W-4.4W 2.0W-3.6W
25-45
Notes:
6. Above table is based on the maximum junction temperature of 135oC.
As shown in the above table, any of the two packages will do the job.
AP1184 Rev. 4
7 of 12
MARCH 2008
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© Diodes Incorporated
AP1184
4A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR
FIXED-MODE REGULATOR
Performance Characteristics
800
1200
1100
1000
900
750 Vcontrol = 2.75 V
Vpower = 2.05 V
700
650
600
550
500
450
400
350
300
250
200
150
100
50
Tj = 120 oC
Tj = 20 oC
Tj = 20 oC
Tj = 120 oC
800
0.5
1.5
2.5 3.0 3.5 4.0
0
1.0
2.0
0
1.0
2.5
Output Current (A)
0.5
1.5 2.0
3.0 3.5 4.0
0
Output Current (A)
Vcontrol Dropout Voltage vs Output Current
Vpower Dropout Voltage vs Output Current
1. 253
1. 252
1. 251
1. 250
0. 15
0. 14
0. 12
0. 10
0. 08
0. 06
Tj = 120 oC
1. 249
1. 248
0. 04
0. 02
0
Tj = 20 oC
1. 247
0
20
40
60
80
100
120
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
Output Current (A)
0
Junction Temperature (oC)
Reference Voltage vs Junction Temperature
Load Regulation vs Output Current
AP1184 Rev. 4
8 of 12
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MARCH 2008
© Diodes Incorporated
AP1184
4A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR
FIXED-MODE REGULATOR
Performance Characteristic ( Continued )
VCONTROL = 5.0V
VPOWER = 3.3V
V
OUT = 2.5V
CCONTROL=10uF
POWER = 100uF
CADJ = 0.1uF
OUT = 470uF
C
C
ILOAD
10mA to 4A
Transient Response
AP1184 Rev. 4
9 of 12
MARCH 2008
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© Diodes Incorporated
AP1184
4A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR
FIXED-MODE REGULATOR
Marking Information
(1) TO263-5L
(Top view)
1184-XX: Voltage
1184-15: 1.5V
1184-18: 1.8V
1184-25: 2.5V
1184-33: 3.3V
1184-50: 5.0V
Logo
L : Lead Free
1184- XX
YY WW X X
Internal Code
Xth Week: 01~52
Year: "01" = 2001
"02" = 2002
(2) TO220-5L
( Top view )
1184-XX: Voltage
1184-15: 1.5V
1184-18: 1.8V
1184-25: 2.5V
1184-33: 3.3V
1184-50: 5.0V
Logo
L : Lead Free
1184-XX
YY WWX X
Internal code
Xth week: 01~52
Year: "01" = 2001
"02" = 2002
AP1184 Rev. 4
10 of 12
MARCH 2008
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© Diodes Incorporated
AP1184
4A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR
FIXED-MODE REGULATOR
Package Information ( unit: mm )
(1) TO263-5L
(2) TO220-5L
AP1184 Rev. 4
11 of 12
MARCH 2008
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© Diodes Incorporated
AP1184
4A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR
FIXED-MODE REGULATOR
IMPORTANT NOTICE
Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further
notice to any product herein. Diodes Incorporated does not assume any liability arising out of the application or use of any product described herein; neither
does it convey any license under its patent rights, nor the rights of others. The user of products in such applications shall assume all risks of such use and will
agreeto hold DiodesIncorporatedand all the companieswhose productsare represented onour website, harmlessagainst all damages.
LIFE SUPPORT
Diodes Incorporated productsare notauthorizedfor use ascriticalcomponentsin lifesupport devices or systemswithout theexpressed written approval ofthe
Presidentof DiodesIncorporated.
AP1184 Rev. 4
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MARCH 2008
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© Diodes Incorporated
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