AP1184T525A [ANACHIP]
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： | AP1184T525A |
| 厂家： | 
ANACHIP CORP |
| 描述： | 4A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator |
| 文件： | 总11页 (文件大小：236K) |
| 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
Feature
General Description
• 0.7V maximum dropout voltage at 4A load current
• Built-in Thermal shutdown
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.
• Output current limiting
• 1A.5dVju,s1ta.8bVle, 2o.r5fVix,e3d.3oVu,tp5u.0t Vvoltage
• Fast transient response
• Good noise rejection
• Packages: SOP-7L, TO220-5L and TO263-5L
Ordering Information
X X X X
AP1184
Low Dropout Regulator
Package
Vout
Lead Free
Packing
Blank : Normal
L : Lead Free Package
Blank : Adj
15 = 1.5V
18 = 1.8V
25 = 2.5V
33 = 3.3V
50 = 5.0V
Blank : Tube
S7:SOP-7L
A : Taping
K5:TO263-5L
T5:TO220-5L
Typical Application
3.3V
+
470uF
GND
NC
Vsense
Vout
2.5V/4A
5V
470uF
Vctrl
Vin
Vout
Vin
+
+
470uF
AP1184-2.5V
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
1/11
AP1184
4A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator
Block Diagram
Vin
Vout
Vsense
Vctrl
+
+
+
1.25V
+
-
CURRENT
LIMIT
THERMAL
Adj
SHUTDOWN
Pin Configuration
FRONT VIEW
FRONT VIEW
5
Adj(GND)
Vsense
Vctrl
1
2
3
8
7
6
NC
5
4
3
2
1
Vin
Vctrl
Vout
Adj(GND)
Vsense
Vin
Vctrl
Vout
Adj(GND)
Vsense
4
Vout
Vin
3
2
1
Vin
4
5
Tab is Vout
Tab is Vout
( AP1184S7 )
(AP1184T5)
(AP1184K5)
Pin Descriptions
Pin Numbers with standard type are for TO220-5L, TO263-5L packages, and those with boldface type are for SOP-7L
Name
I/O
Description
Adj
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
I
I
Vin
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
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
Anachip Corp.
www.anachip.com.tw
Rev.1.1 Sep 7, 2004
2/11
AP1184
4A 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
Storage temperature Range
Operation Junction Temperature Range
Internally limited
-65 to +150
0 to +150
oC
oC
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
Io=10mA, Tj=25oC, (Vin-Vout)=0.7V,
VREF Reference Voltage AP1184-Adj
1.225 1.250 1.275
V
%
V
V
ctrl=VIN+1V
IO=10mA, VOUT+0.7V<VIN<12V, TJ =25oC
Line Regulation
AP1184-XXX
AP1184-1.5
AP1184-1.8
AP1184-2.5
AP1184-3.3
0.2
V
ctrl=VIN+1V
IOUT = 10mA, TJ = 25oC, 2.2V≦VIN≦12V
ctrl=VIN+1V
IOUT = 10mA, TJ = 25oC, 2.5V≦VIN≦12V
1.470 1.500 1.530
V
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
V
V
V
ctrl=VIN+1V
IOUT = 10mA, TJ = 25oC, 3.2V≦VIN≦12V
Vctrl=VIN+1V
Vout Output Voltage
IOUT = 10mA, TJ = 25oC, 4.0V≦VIN≦12V
V
ctrl=VIN+1V
IOUT = 10mA, TJ = 25oC, 5.7V≦VIN≦12V
Vctrl=VIN+1V
AP1184-5.0
AP1184-Adj
AP1184-1.5
AP1184-1.8
AP1184-2.5
AP1184-3.3
AP1184-5.0
V
0mA<Io<4A, TJ =25oC
%
(VIN- VOUT)=2V ,Vctrl =VIN + 1V
VIN=3V, 0mA<Io<4A, TJ =25oC
12
15
20
26
40
15
18
25
33
50
mV
mV
mV
mV
mV
V
ctrl=4V
VIN=3.3V, 0mA<Io<4A, TJ =25oC
ctrl=4.3V
Load
V
VIN=4V, 0mA<Io<4A, TJ =25oC
Regulation
V
V
V
V
V
ctrl=5V
IN = 5V, 0mA<Io<4A, TJ=25oC
ctrl=6V
IN = 8V, 0mA<Io<4A, TJ=25oC
ctrl=9V
Vadj=0V for all conditions below.
Vin=2.05V, Io=1.5A
Dropout Voltage
(Vctrl –Vout)
1.15
1.18
1.25
V
Vin=2.05V, Io=3A
Vin=2.05V, Io=4A
1.10
Vadj=0V for all conditions below.
Dropout Voltage
(Vin -Vout)
V
V
V
ctrl =2.75V, Io=1.5A
ctrl =2.75V, Io=3A
ctrl =2.75V, Io=4A
0.26
0.50
0.70
0.38
0.60
0.85
V
Current Limit
Minimum Load
Current
4.2
A
V
ctrl =2.75V, Vin=2.05V,∆Vo=100mV, Vadj=0V
Vctrl =5V, Vin=3.3V, Vadj=0V
5
10
mA
Anachip Corp.
www.anachip.com.tw
Rev.1.1 Sep 7, 2004
3/11
AP1184
4A 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 refer to Tj=25oC.
Vout=Vsense.
Sym.
Parameter
Test Condition
Min. Typ. Max. Unit
Thermal Regulation 30mS Pulse
0.01
70
0.02 %/W
dB
V
ctrl =5V, Vin=5V, Io=4A, Vadj=0V, Tj=25, Vripple=1Vpp at
Ripple Rejection
60
120Hz
Vadj=0V for all conditions below.
V
ctrl =2.75V, Vin=2.05V, Io=1.5A
6
25
Control Pin Current
Vctrl =2.75V, Vin=2.05V, Io=3A
Vctrl=2.75V, Vin=2.05V, Io=4A
30
33
50
3.5
2.5
20
60
70
mA
Iadj Adjust Pin Current Vctrl=2.75V, Vin=2.05,Vadj=0
150
µA
TO-263: Control Circuitry/Power Transistor
OC/W
OC/W
OC/W
Thermal Resistance
Junction-to-Case
θ JC
TO-220: Control Circuitry/Power Transistor
SOP-7: Control Circuitry/Power Transistor
NOTE:
AP1184-ADJ incorporates an internal thermal shutdown that protects the device when the junction temperature exceeds the allowable
maximum junction temperature.
Package
TO263/TO220
SOP7
Max Pd.
2.4W~4.4W With heat sink or amount of copper board needed.
1W~2W With heat sink or amount of copper board needed.
Remarks
Functional Descriptions
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.
Introduction
The AP1184 regulator is 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
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:
Anachip Corp.
www.anachip.com.tw
Rev.1.1 Sep 7, 2004
4/11
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 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. 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
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.
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
Anachip Corp.
www.anachip.com.tw
Rev.1.1 Sep 7, 2004
5/11
AP1184
4A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator
Functional Descriptions(Continued)
Thermal Design
Assuming, the following conditions:
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.
Vout=2.5V
Vin=3.3V
Vctrl=5V
Iout=2A 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.
Max Pd (Ta=25oC)
1.7W
Max Pd (Ta=45oC)
1.4W
θ
JA (oC/W)
65
Package
SOP7
Copper Area
1.0” X 1.0”
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. For low cost applications the SOP7 package is
recommended.
Anachip Corp.
www.anachip.com.tw
Rev.1.1 Sep 7, 2004
6/11
AP1184
4A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator
Performance Characteristic
800
1200
750 Vcontrol = 2.75 V
Vpower = 2.05 V
700
650
600
550
500
450
400
350
300
250
200
150
100
50
1100
1000
900
Tj = 120 oC
Tj = 20 oC
Tj = 20 oC
Tj = 120 oC
800
0.5
1.5
Output Current (A)
control Dropout Voltage vs Output Current
2.5 3.0 3.5 4.0
0
1.0
2.0
0
1.0
2.5
Output Current (A)
power Dropout Voltage vs Output Current
0.5
1.5 2.0
3.0 3.5 4.0
0
V
V
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)
Load Regulation vs Output Current
0
Junction Temperature (oC)
Reference Voltage vs Junction Temperature
Anachip Corp.
www.anachip.com.tw
Rev.1.1 Sep 7, 2004
7/11
AP1184
4A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator
Performance Characteristic (continued )
VCONTROL = 5.0V
POWER = 3.3V
V
VOUT = 2.5V
C
C
C
CONTRROL=10uF
POWER = 100uF
ADJ = 0.1uF
COUT = 470uF
ILOAD
10mA to 4A
Transient Response
Marking Information
XX:
( Top View)
Blank=adj,15= 1.5V,
18= 1.8V, 25=2.5V
33= 3.3V, 50= 5.0V
Logo
Part Number
1184-XX
Blank: normal
L: Lead Free Package
YY WW X X
X
: Internal code ( Optional)
WW : Nth week : 01~52
YY : Year : "01"=2001
"02"=2002
( SOP-7L / TO220-5L / TO263-5L )
Anachip Corp.
www.anachip.com.tw
Rev.1.1 Sep 7, 2004
8/11
AP1184
4A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator
Package Outline
(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
9/11
AP1184
4A 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
1.57
14.61
2.29
-
Nom.
4.46
0.84
0.50
1.27
9.15
10.16
1.71
15.24
2.54
-
Max.
4.85
1.02
0.64
1.40
9.65
10.54
1.85
15.88
2.79
2.92
Min.
0.160
0.026
0.014
0.045
0.341
0.385
0.062
0.575
0.090
-
Nom.
0.176
0.033
0.020
0.050
0.360
0.400
0.068
0.600
0.100
-
Max.
0.191
0.040
0.025
0.055
0.380
0.415
0.073
0.625
0.110
0.115
A
B
C
C2
D
E
e
L
L1
L2
Anachip Corp.
www.anachip.com.tw
Rev.1.1 Sep 7, 2004
10/11
AP1184
4A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator
(3). Package Type: SOP-7L
C2
C3
B1 B2
A
E
e
C1
C
D
β
F
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min.
Nom.
Max.
Min.
Nom.
Max.
A
B1
B2
C
5.79
3.83
3.78
4.80
1.57
0.32
1.17
0.19
5.99
3.91
3.86
4.87
1.67
0.4
1.27
0.22
1.04REF
0.68
1.45
7o
6.19
3.99
3.94
4.94
1.77
0.48
1.37
0.25
0.228
0.151
0.149
0.189
0.062
0.013
0.046
0.007
0.236
0.154
0.152
0.192
0.066
0.016
0.050
0.009
0.041REF
0.027
0.057
7o
0.244
0.157
0.155
0.194
0.070
0.019
0.054
0.010
C1
C2
C3
D
E
e
0.48
1.35
0.88
1.55
0.019
0.053
0.035
0.061
F
β
Anachip Corp.
www.anachip.com.tw
Rev.1.1 Sep 7, 2004
11/11
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