AP1186T525L [ANACHIP]
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： | AP1186T525L |
| 厂家： | 
ANACHIP CORP |
| 描述： | 1.5A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator |
| 文件： | 总8页 (文件大小：192K) |
| 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
Feature
General Description
• Adjustable or Fixed output voltage 1.5V, 1.8V,
2.5V, 3.3V, 5.0V
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 switching regulator. One
such application is the new graphic chip sets that
require anywhere from 2.4V to 2.7V supply.
• 0.5V Maximum Dropout voltage at 1.5A Load
current
• Built-in Thermal Shutdown
• Output Current Limiting
• Fast transient response
• Good noise rejection
• Package : TO220-5L, TO263-5L
Ordering Information
AP 1186
Low Dropout Regulator
Package
Vout
Lead Free
Packing
K5:TO-263-5L Blank : Adj Blank : Normal
Blank : Tube
T5:TO-220-5L 15 : 1.5V
18 : 1.8V
L : Lead Free Package A : Taping& Reel
25 : 2.5V
33 : 3.3V
50 : 5.0V
Typical Application
3V
5V
+
470uF
+
Vin
Vctrl
5
4
3
2
1
470uF
Vout
2.5V/1.5A
GND
Vsense
+
470uF
This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of
this product. No rights under any patent accompany the sale of the product.
Rev.1.1 Sep.7, 2004
1/8
AP1186
1.5A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator
Block Diagram
Vin
Vout
Vsense
Vctrl
+
+
+
1.25V
+
-
CURRENT
LIMIT
THERMAL
Adj
SHUTDOWN
Package Connect Diagram
5 PIN TO263
FRONT VIEW
5 PIN TO220
FRONT VIEW
Vin
Vctrl
Vout
Adj(GND)
Vsense
5
4
3
2
1
Vin
Vctrl
Vout
Adj(GND)
Vsense
5
4
3
2
1
Tab is Vout
Tab is Vout
Pin Descriptions
Name
Adj
I/O
Description
A resistor divider from this pin to the Vout pin and ground sets the output voltage.
(GND only for fixed mode)
(GND)
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 by higher than the Vout pin in order the
device to regulate. A minimum of 100uF capacitor must be connected from this pin
to ground to insure stability.
Vctrl
I
NC
Not used.
The output of the regulator. A minimum of 100uF capacitor must be connected from
this pin to ground to insure stability.
Vout
O
Anachip Corp.
www.anachip.com.tw
Rev.1.1 Sep.7, 2004
2/8
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
Control Input Voltage
18
V
PD
TST
TOP
Power Dissipation
Internally Limited
-65 to +150
0 to +150
o
o
Storage Temperature
Operating Junction Temperature Range
C
C
Electrical Characteristics
Unless otherwise specified, these specifications apply over, Cin=1uF, Cout=10uF, and Tj=0 to 150oC. Typical value refer to Tj=25oC.
Vout = Vsense.
SYM.
Parameter
Test Condition
Min. Typ. Max. Unit
TJ=25oC,(VIN-VOUT)=0.5V,IO=10mA
Vctrl=VIN+1V
VREF Reference Voltage AP1186-Adj
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
V
IOUT = 10mA, TJ = 25oC, 2V≦VIN≦12V
Vctrl=VIN+1V
AP1186-1.5
IOUT = 10mA, TJ = 25oC, 2.3V≦VIN≦12V
Vctrl=VIN+1V
AP1186-1.8
IOUT = 10mA, TJ = 25oC, 3V≦VIN≦12V
Vctrl=VIN+1V
Vout Output Voltage
Line Regulation
V
AP1186-2.5
AP1186-3.3
IOUT = 10mA, TJ = 25oC, 3.8V≦VIN≦12V
Vctrl=VIN+1V
I
OUT = 10mA, TJ = 25oC, 5.5V≦VIN≦12V
AP1186-5.0
AP1186-XXX
AP1186-Adj
AP1186-1.5
AP1186-1.8
AP1186-2.5
AP1186-3.3
4.900 5.000 5.100
Vctrl=VIN+1V
IO=10mA, VOUT+0.5V<VIN<12V
Vctrl=VIN+1V
0.2
1
%
0mA<Io<1.5A, TJ=25oC
(VIN – VOUT) = 2V, Vctrl= VIN + 1V
VIN=3V, 0mA<Io<1.5A, TJ=25oC
Vctrl=4V
%
12
15
20
26
15
18
25
33
mV
mV
mV
mV
VIN=3.3V, 0mA<Io<1.5A, TJ=25oC
Vctrl=4.3V
Load Regulation
VIN=4V, 0mA<Io<1.5A, TJ=25oC
Vctrl=5V
VIN = 5V, 0≦IOUT≦1.5A, TJ=25oC ,
TJ=25oC Vctrl=6V
VIN = 8V, 0≦IOUT≦1.5A, TJ=25oC ,
TJ=25oC Vctrl=9V
AP1186-5.0
40
50
mV
V
Dropout Voltage
(Vctrl-Vout)
Vadj=0V for all conditions below.
Vin=2.05V, Io=1.5A
1.23
Dropout Voltage
(Vin-Vout)
Vadj=0V for all conditions below.
Vctrl=3V, Io=1.5A
V
A
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
Anachip Corp.
www.anachip.com.tw
Rev.1.1 Sep.7, 2004
3/8
AP1186
1.5A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator
Electrical Characteristics
Unless otherwise specified, these specifications apply over, Cin=1uF, Cout=10uF, and Tj=0 to 150oC. Typical value refer to Tj=25oC.
Vout = Vsense.
SYM.
Parameter
Test Condition
Min. Typ. Max. Unit
Thermal
30ms Pulse
0.01 0.02 %W
Regulation
Vctrl =5V, Vin=5V, Io=1.5A, Vadj=0V, Tj=25,
Vripple=1Vpp at 120Hz
Vadj=0V for all conditions below.
Vctrl=2.75V, Vin=2.05V, Io=1.5A
Ripple Rejection
60
70
dB
Control Pin
Current
6
25
mA
Iadj Adjust Pin Current Vctrl=2.75V, Vin=2.05,Vadj=0
Thermal
50
150 µA
oC/W
TO-263: Control Circuitry/Power Transistor
2.5
2.5
ΘJC Resistance
Junction-to-Case
TO-220: Control Circuitry/Power Transistor
NOTE:
AP1186-ADJ incorporates an internal thermal shutdown that protects the device when the junction temperature exceeds the allowable
maximum junction temperature.
Package
Max Pd.
TO-263/TO-220 2.4W~4.4W With heat sink or amount of copper board needed.
Functional Descriptions
Introduction
switch the load current from zero to several amps in
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
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 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:
Anachip Corp.
www.anachip.com.tw
Rev.1.1 Sep.7, 2004
4/8
AP1186
1.5A 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
AP1186-ADJ
Vsense
Vctrl
Vref
R1+
R2+
Adj
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 ans 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.
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 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
Vout
Vin
Vin
AP1186-ADJ
Adj
Vsense
Vctrl
Vctrl
R1
R2
RL
Stability
increases, the ESR decreases resulting in a fixed
RC time constant. The AP1186-XXX takes
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. Fortunately as the capacitance
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.
Anachip Corp.
www.anachip.com.tw
Rev.1.1 Sep.7, 2004
5/8
AP1186
1.5A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator
Functional Descriptions (Continued)
Thermal Design
Assuming, the following conditions:
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.
Vout=2.5V
Vin=3.3V
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.
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.
Marking Information
Blank : Adj, 15=1.5V,
18=1.8V, 25=2.5V,
33=3.3V, 50=5.0V
Blank : normal
1186-XX
YYWWX X
L : Lead Free Package
ID Code
Xth Week : 01~52
Year : "01"=2001
"02"=2002
TO263-5L,TO220-5L
Anachip Corp.
www.anachip.com.tw
Rev.1.1 Sep.7, 2004
6/8
AP1186
1.5A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator
Package Information
(1)Package Type : TO220-5L
E
A
F
ΦP
b
C
e
J1
e1
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min.
4.07
0.76
0.36
14.22
9.78
1.57
6.68
1.14
5.46
2.29
13.21
3.68
2.54
Nom.
4.45
0.89
0.50
14.86
10.16
1.71
6.81
1.27
6.16
2.74
13.97
3.81
2.73
Max.
4.82
1.02
0.64
15.50
10.54
1.85
6.93
1.40
6.86
3.18
14.73
3.94
2.92
Min.
Nom.
0.175
0.035
0.020
0.585
0.400
0.067
0.268
0.050
0.243
0.108
0.550
0.150
0.107
Max.
A
b
C
D
E
e
e1
F
H1
J1
L
Øp
Q
0.160
0.030
0.014
0.560
0.385
0.062
0.263
0.045
0.215
0.090
0.520
0.145
0.100
0.190
0.040
0.025
0.610
0.415
0.073
0.273
0.055
0.270
0.125
0.580
0.155
0.115
Anachip Corp.
www.anachip.com.tw
Rev.1.1 Sep.7, 2004
7/8
AP1186
1.5A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator
(2) Package Type: TO263-5L
E
10.9
1.0
1.7
Land Pattern Recommendation (Unit: mm)
e
B
L1
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min.
4.07
0.66
0.36
1.14
8.65
9.78
Nom.
4.46
0.84
0.50
1.27
9.15
10.16
Max.
4.85
1.02
0.64
1.40
9.65
10.54
Min.
0.160
0.026
0.014
0.045
0.341
0.385
Nom.
0.176
0.033
0.020
0.050
0.360
0.400
Max.
0.191
0.040
0.025
0.055
0.380
0.415
A
B
C
C2
D
E
e
L
L1
L2
1.57
1.71
1.85
0.068
0.073
0.062
0.575
0.090
-
14.61
2.29
-
15.24
2.54
-
15.88
2.79
2.92
0.600
0.100
-
0.625
0.110
0.115
Anachip Corp.
www.anachip.com.tw
Rev.1.1 Sep.7, 2004
8/8
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