AP1186 [DIODES]
1.5A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR FIXED-MODE REGULATOR; 1.5A超低压差正可调或固定模式稳压器
| 型号： | AP1186 |
| 厂家： | 
DIODES INCORPORATED |
| 描述： | 1.5A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR FIXED-MODE REGULATOR |
| 文件： | 总9页 (文件大小：265K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AP1186
1.5A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR
FIXED-MODE REGULATOR
General Description
Features
AP1186 is a 1.5A 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 a switcher can be
achieved without the cost and complexity associated with a
switching regulator. One such application is the new graphic chip
sets that require anywhere from 2.4V to 2.7V supply.
•
Adjustable or Fixed output voltage 1.5V, 1.8V, 2.5V,
3.3V, 5.0V
0.5V Maximum Dropout voltage at 1.5A Load current
Built-in Thermal Shutdown
Output Current Limiting
Fast transient response
Good noise rejection
Packages: TO220-5L, TO263-5L
Lead Free Finish/RoHS Compliant for Lead Free
products (Note 1)
•
•
•
•
•
•
•
Ordering Information
1186 X - X X X
Vout
AP
Package
Lead Free
Packing
K5:TO263-5L Blank : Adj
T5:TO220-5L 15 : 1.5V
18 : 1.8V
-U : Tube
-13: Taping
L : Lead Free Package
25 : 2.5V
33 : 3.3V
50 : 5.0V
Note: 1. RoHS revision 13.2.2003. Glass and High Temperature Solder Exemptions Applied, see EU Directive Annex Notes 5 and 7.
Tube
Part Number
13” Tape and Reel
Package Packaging
Code
Device
Part Number
(Note 2)
Quantity
Quantity
Suffix
Suffix
AP1186T5
AP1186K5
T5
K5
TO220-5L
TO263-5L
50
50
-U
-U
NA
NA
Lead-free
Lead-free
800/Tape & Reel
-13
Note:
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.
Typical Application
3V
5V
470uF
+
+
Vin
5
4
3
2
1
470uF
Vctrl
Vou
2.5
V
/1.5A
t
GND
Vsense
+
470uF
AP1186 Rev. 1
1 of 9
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MARCH 2007
© Diodes Incorporated
AP1186
1.5A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR
FIXED-MODE REGULATOR
Block Diagram
Vin
Vout
Vsense
Vctrl
+
+
+
1.25V
+
-
CURRENT
LIMIT
THERMAL
SHUTDOWN
Adj
Package Connect Diagram
5 PIN TO263
FRONT VIEW
5 PIN TO220
FRONT VIEW
Vin
5
4
3
2
1
Vin
5
Vctrl
Vout
Vctrl
Vout
4
3
Adj(GND)
Vsense
2
1
Adj(GND)
Vsense
Tab is Vout
Tab is Vout
Pin Descriptions
Name
I/O
Description
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.
Vsense
I
Adj
(GND)
A resistor divider from this pin to the Vout pin and ground sets the output voltage.
(GND only for fixed mode)
The output of the regulator. A minimum of 100uF capacitor must be connected from this pin to ground
to insure stability.
Vout
Vctrl
O
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 by higher than the Vout pin in order for the device to regulate. A minimum of
100uF 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.
Vin
I
AP1186 Rev. 1
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MARCH 2007
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© Diodes Incorporated
AP1186
1.5A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR
FIXED-MODE REGULATOR
Absolute Maximum Ratings
Symbol
Vin
Parameter
Rating
16
Unit
V
Input Voltage
Vctrl
PD
Control Input Voltage
Power Dissipation
18
V
Internally Limited
o
TST
Storage Temperature
-65 to +150
0 to +150
C
o
TOP
Operating Junction Temperature Range
C
Electrical Characteristics
Unless otherwise specified, these specifications apply over, Cin = 1uF, Cout = 10uF, and TJ = 0 to 150oC. Typical value refers to TA =
25oC. Vout = Vsense.
SYM.
Parameter
Reference
Voltage
Test Condition
Min. Typ. Max. Unit
TA = 25oC,(VIN-VOUT) = 0.5V,IO = 10mA
V
I
VREF
AP1186-Adj
AP1186-1.5
AP1186-1.8
AP1186-2.5
AP1186-3.3
AP1186-5.0
1.225 1.250 1.275
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
0.2
V
ctrl = VIN+1V
OUT = 10mA, TA = 25oC, 2V≦VIN≦12V
Vctrl = VIN+1V
OUT = 10mA, TA = 25oC, 2.3V≦VIN≦12V
ctrl = VIN+1V
OUT = 10mA, TA = 25oC, 3V≦VIN≦12V
ctrl = VIN+1V
OUT = 10mA, TA = 25oC, 3.8V≦VIN≦12V
Vctrl = VIN+1V
OUT = 10mA, TA = 25oC, 5.5V≦VIN≦12V
ctrl = VIN+1V
IO = 10mA, VOUT+0.5V<VIN<12V
I
V
I
V
Vout Output Voltage
V
I
I
V
Line Regulation AP1186-XXX
AP1186-Adj
%
V
ctrl = VIN+1V
0mA<Io<1.5A, TA=25oC
1
%
(VIN – VOUT) = 2V, Vctrl = VIN + 1V
VIN = 3V, 0mA<Io<1.5A, TA = 25oC
Vctrl = 4V
AP1186-1.5
12
15
20
26
15
18
25
33
mV
mV
mV
mV
VIN = 3.3V, 0mA<Io<1.5A, TA = 25oC
AP1186-1.8
V
ctrl = 4.3V
Load Regulation
AP1186-2.5
VIN = 4V, 0mA<Io<1.5A, TA = 25oC
Vctrl = 5V
VIN = 5V, 0≦IOUT≦1.5A, TA = 25oC ,
TA= 25oC Vctrl = 6V
AP1186-3.3
AP1186-5.0
VIN = 8V, 0≦IOUT≦1.5A, TA= 25oC ,
TA= 25oC Vctrl = 9V
40
50
mV
V
Dropout Voltage Vadj = 0V for all conditions below.
(Vctrl-Vout) Vin = 2.05V, Io = 1.5A
Dropout Voltage Vadj = 0V for all conditions below.
1.23
V
A
(Vin-Vout)
Vctrl = 3V, Io = 1.5A
0.26 0.38
10
Current Limit
Minimum Load
Current
Vctrl = 3V, Vin = 2.05V, ∆Vo = 100mV, Vadj = 0V
1.6
Vctrl = 5V, Vin = 3.3V, Vadj = 0V
5
mA
AP1186 Rev. 1
3 of 9
MARCH 2007
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© Diodes Incorporated
AP1186
1.5A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR
FIXED-MODE REGULATOR
Electrical Characteristics ( Continued )
Unless otherwise specified, these specifications apply over, Cin = 1uF, Cout = 10uF, and Tj = 0 to 150oC. Typical value refers
to Tj = 25oC. Vout = Vsense.
SYM.
Parameter
Thermal
Regulation
Test Condition
Min. Typ. Max. Unit
30ms Pulse
0.01 0.02 %W
Vctrl = 5V, Vin = 5V, Io = 1.5A, Vadj = 0V, Tj = 25,
Vripple = 1Vpp at 120Hz
Ripple Rejection
60
70
dB
Control Pin
Current
Vadj = 0V for all conditions below.
Vctrl = 2.75V, Vin = 2.05V, Io = 1.5A
6
25
mA
Iadj Adjust Pin Current Vctrl = 2.75V, Vin = 2.05,Vadj = 0
Thermal
50
150 µA
oC/W
TO263-5L: Control Circuitry/Power Transistor
2.5
2.5
ΘJC Resistance
Junction-to-Case
TO220-5L: Control Circuitry/Power Transistor
Note:
3. AP1186-ADJ incorporates an internal thermal shutdown that protects the device when the junction temperature exceeds the allowable
maximum junction temperature.
AP1186 Rev. 1
4 of 9
MARCH 2007
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© Diodes Incorporated
AP1186
1.5A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR
FIXED-MODE REGULATOR
Functional Descriptions
Introduction
processor pins, which translates to an approximately 300 to
The AP1186 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 AP1186 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 AP1186-ADJ 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
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 AP1186 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 AP1186-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:
Vout = Vref (1+R2/R1) + Iadj * R2 where : Vref = 1.25V & Iadj=50uA Typically
Vin
Vout
AP1186-ADJ
Adj
Vsense
Vctrl
Vref
R1+
R2+
Iadj=50uA
The AP1186-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.
output voltage and should be considered when very precise
output voltage setting is required.
Load Regulation
Since the AP1186 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 AP1186 with remote
sensing.
Since the minimum load current requirement of the AP1186-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
Vout
Vin
Vin
AP1186-ADJ
Adj
Vsense
Vctrl
Vctrl
R1
R2
RL
AP1186 Rev. 1
5 of 9
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MARCH 2007
© Diodes Incorporated
AP1186
1.5A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR
FIXED-MODE REGULATOR
Function Descriptions (Continued)
Stability
Fortunately as the capacitance increases, the ESR decreases
resulting in a fixed RC time constant. The AP1186-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.
The AP1186-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.
Thermal Design
Vin = 3.3V
The AP1186-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.
Assuming, the following conditions:
Vctrl = 5V
Iout = 1.5A DC Avg.
Calculate the maximum power dissipation using the
following equation:
Pd = Iout*(Vin-Vout)+(Iout/60)*(Vctrl-Vout)
Pd = 2*(3.3-2.5)+(2/60)*(5-2.5) = 1.68W
Using table below select the proper package and the
amount of copper board needed.
Vout = 2.5V
Package
Copper Area
ΘJA (oC/W)
Max Pd ( Ta = 25oC ) Max Pd ( Ta = 45oC )
TO263
Pad Size-1.4”X1.4”
25-45
2.4W-4.4W
2.0W-3.6W
Note: 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.
AP1186 Rev. 1 - 0
6 of 9
MARCH 2007
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© Diodes Incorporated
AP1186
1.5A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR
FIXED-MODE REGULATOR
Marking Information
(1) TO220-5L
( Top view )
1186-XX: Voltage
1186-15: 1.5V
1186-18: 1.8V
1186-25: 2.5V
1186-33: 3.3V
1186-50: 5.0V
Logo
L: Lead Free Package
1186-XX
XX XX X X
Internal code
Xth week: 01~52
Year: "01" = 2001
"02" = 2002
(2) TO263-5L
(Top view)
1186-XX: Voltage
Logo
1186-15: 1.5V
1186-18: 1.8V
1186-25: 2.5V
1186-33: 3.3V
1186-50: 5.0V
L: Lead Free Package
1186- XX
X X X X X X
Internal Code
Xth Week: 01~52
Year: "01" = 2001
"02" = 2002
AP1186 Rev. 1
7 of 9
MARCH 2007
www.diodes.com
© Diodes Incorporated
AP1186
1.5A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR
FIXED-MODE REGULATOR
Package Information
(1) Package Type: TO220-5L
AP1186 Rev. 1
8 of 9
MARCH 2007
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© Diodes Incorporated
AP1186
1.5A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR
FIXED-MODE REGULATOR
Package Information (Continued)
(2) Package Type: TO263-5L
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 lifesupportdevices or systemswithout theexpressed written approval ofthe
PresidentofDiodesIncorporated.
AP1186 Rev. 1
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MARCH 2007
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© Diodes Incorporated
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