AP1084K18 [ANACHIP]
5A Low Dropout Positive Adjustable or Fixed-Mode Regulator; 5A低压差正可调或固定模式稳压器
| 型号： | AP1084K18 |
| 厂家： | 
ANACHIP CORP |
| 描述： | 5A Low Dropout Positive Adjustable or Fixed-Mode Regulator |
| 文件： | 总10页 (文件大小：197K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AP1084
5A Low Dropout Positive Adjustable or Fixed-Mode Regulator
Features
General Description
• 1.4V maximum dropout at full load current
• Built-in thermal shutdown
AP1084 is a low dropout positive adjustable or fixed-
mode regulator with minimum of 5.0A output current
capability. The product is specifically designed to
provide well-regulated supply for low voltage IC
• Output current limiting
• 3A.3dVju,s5ta.0bVle output voltage or fixed 1.5V, 1.8V, 2.5V, applications such as high-speed bus termination and
• Fast transient response
• Good noise rejection
low current 3.3V logic supply. AP1084 is also well
suited for other applications such as VGA cards.
AP1084 is guaranteed to have lower than 1.4V
dropout at full load current making it ideal to provide
well-regulated outputs of 1.25 to 3.3V with 4.7 to
12V input supply.
• Package : TO252, TO263, TO220
Ordering Information
Package
Low Dropout Regulator
Vout
Lead Free
Packing
Blank : Normal
Blank : Adj
15 = 1.5V
18 = 1.8V
25 = 2.5V
33 = 3.3V
50 = 5.0V
Blank : Tube
D : TO252-3L
K : TO263-3L
T : TO220-3L
L : Lead Free Package
A
: Taping
Typical Circuit
5.0V to 3.3V Fixed Mode Regulator
Adjustable Regulator
5V
5V
C1
C1
100uF
100uF
Vin
Vin
Vout
Adj
2.5V/5A
Vout
3.3V/5A
Ω
Ω
R1
R2
121
121
C2
100uF
C2
GND
100uF
Tab is Vout
Tab is Vout
R2
R1
V = VREF ∗(1+
)
Note:
o
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.1.0 Aug.27, 2004
1/10
AP1084
5A Low Dropout Positive Adjustable or Fixed-Mode Regulator
Block Diagram
Vin
3
2
Vout
+
+
+
1.25V
－
CURRENT
LIMIT
+
Thermal
1
Adj
Shutdown
Connection Diagram
TO263
TO252
TO220
FRONT VIEW
FRONT VIEW
3
FRONT VIEW
Vin
3
2
1
Vin
Vin
3
Vout
Vout
2
Vout
2
1
Adj (GND)
Adj (GND)
1
Adj (GND)
Tab is Vout
Tab is Vout
Tab is Vout
Pin Descriptions
NAME
I/O
PIN #
FUNCTION
Adjustable (Ground only for fixed mode)
Adj (GND)
1
The output of the regulator. A minimum of 10uF capacitor must be
connected from this pin to ground to insure stability.
Vout
Vin
O
I
2
3
The input pin of 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 1.4V higher than Vout in order for the device to regulate
properly.
Anachip Corp.
www.anachip.com.tw
Rev.1.0 Aug.27, 2004
2/8
AP1084
5A Low Dropout Positive Adjustable or Fixed-Mode Regulator
Absolute Maximum Ratings
Symbol
Parameter
Rating
Unit
Vin
DC Supply Voltage
Power Dissipation
-0.3 to 12
V
PD
Internally Limited
o
o
TST
TOP
Storage Temperature
-65 to +150
0 to +150
C
C
Operating Junction Temperature Range
Electrical Characteristics (Under Operating Conditions)
SYM.
PARAMETER
Reference Voltage
AP1084-XXX
AP1084-1.5
CONDITIONS (Notes)
Io=10mA, Tj=25oC, (Vin-Vout)=1.5V
IO=10mA, VOUT+1.5V<VIN<12V, TJ =25oC
MIN
TYP
MAX
UNIT
V
VREF
1.225
1.250
1.275
0.2
%
V
I
I
OUT = 10mA, TJ = 25oC, 3V≦VIN≦12V
OUT = 10mA, TJ = 25oC, 3.3V≦VIN≦12V
1.470
1.764
2.450
3.235
4.900
1.500
1.800
2.500
3.300
5.000
1.530
1.836
2.550
3.365
5.100
AP1084-1.8
V
Line
IOUT = 10mA, TJ = 25oC, 4V≦VIN≦12V
IOUT = 10mA, TJ = 25oC, 4.8V≦VIN≦12V
Regulation
AP1084-2.5
V
AP1084-3.3
AP1084-5.0
V
I
OUT = 10mA, TJ = 25oC, 6.5V≦VIN≦12V
V
VIN=3.3V, 0mA<Io<5A, TJ =25oC
(Note 1,2)
AP1084-Adj
AP1084-1.5
AP1084-1.8
AP1084-2.5
1
%
VIN=3V, 0mA<Io<5A, TJ =25oC
(Note 1,2)
12
15
20
15
18
25
mV
mV
mV
Load
VIN=3.3V, 0mA<Io<5A
Regulation
TJ =25oC (Note 1,2)
VIN=4V, 0mA<Io<5A
TJ =25oC (Note 1,2)
AP1084-3.3
AP1084-5.0
Dropout Voltage
Current Limit
Minimum Load
Current
VIN = 5V, 0mA<Io<5A , TJ=25oC (Note 1,2)
26
40
1.3
33
50
1.4
mV
mV
V
VIN = 8V, 0mA<Io<5A, TJ=25oC (Note 1,2)
∆Vo
Io=5.0A (∆Vout = 1% Vout)
Vin-Vout=5V
5.1
A
5
10
mA
%
Temperature Stability Io=10mA
0.5
Thermal Resistance
TO-252
98
91
83
Junction-to-Ambient
TO-263
OC/W
θ JA
θ JC
(No heat sink ;No air
TO-220
flow)
TO-252: Control Circuitry/Power Transistor
15
10
Thermal Resistance
Junction-to-Case
TO-263: Control Circuitry/Power Transistor
TO-220: Control Circuitry/Power Transistor
OC/W
0.65/2.7
Note 1: See thermal regulation specifications for changes in output voltage due to heating effects. Line and load regulation are measured
at a constant junction temperature by low duty cycle pulse testing. Load regulation is measured at the output lead = 1/18” from the
package.
Note 2:Line and load regulation are guaranteed up to the maximum power dissipation of 15W. Power dissipation is determined by the
difference between input and output and the output current. Guaranteed maximum power dissipation will not be available over
the full input/output range.
Anachip Corp.
www.anachip.com.tw
Rev.1.0 Aug.27, 2004
3/10
AP1084
5A Low Dropout Positive Adjustable or Fixed-Mode Regulator
Functional Description
Introduction
The AP1084 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 output capacitors.
The AP1084 adjustable Low Dropout (LDO)
regulator is a 3 terminal device that can easily be
programmed with the addition of two external
resistors to any voltages within the range of 1.25 to
5V. The AP1084 only needs 1.4V differential
between Vin and Vout to maintain output regulation.
In addition, the output voltage tolerances are also
extremely tight and they include the transient
response as part of the specification. For example,
Intel VRE specification calls for a total of +/- 100mV
including initial tolerance, load regulation and 0 to
5.0A load step.
Output Voltage Setting
The AP1084 can be programmed to any voltages in
the range of 1.25V to 5V with the addition of R1 and
R2 external resistors according to the following
formula:
Vout = Vref (1+ R2/R1) +Iadj *R2 , where Vref = 1.25 typically, Iadj = 55uA
typically R1&R2 as shown at below
Vin
Vout
AP1084
Adj
Vref
R1
R2
Iadj=55uA
The AP1084 keeps a constant 1.25V between the
output pin and the adjust pin. By placing a resistor
R1 across these two pins 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 which will be 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 AP1084 is 10mA, R1 is
typically selected to be 121Ω resistor so that it
automatically satisfies the minimum current
requirement. Notice that since Iadj is typically in the
range of 55uA it only adds a small error to the
output voltage and should only be considered when
a very precise output voltage setting is required. For
example, in a typical 3.3V application where
R1=121Ω and R2=200Ω the error due to Iadj is only
0.3% of the nominal set point.
output voltage at the load. The best load regulation
is achieved when the bottom side of R2 is
connected to the load and the top-side of R1
resistor is connected directly to the case or the Vout
pin of the regulator and not to the load. It is
important to note that for high current applications,
this can re-present a significant percentage of
the overall load regulation and one must keep the
path from the regulator to the load as short as
possible to minimize this effect.
Stability
The AP1084 requires the use of an output capacitor
as part of the frequency compensation in order to
make the regulator stable. For most applications a
minimum of 10uF aluminum electrolytic capacitor
insures both stability and good transient response.
Load Regulation
Since the AP1084 is only a 3 terminal device, it is
not possible to provide true remote sensing of the
Anachip Corp.
www.anachip.com.tw
Rev.1.0 Aug.27, 2004
4/10
AP1084
5A Low Dropout Positive Adjustable or Fixed-Mode Regulator
Functional Description (Continued)
Thermal Design
Layout Consideration
The AP1084 incorporates an internal thermal
shutdown that protects the device when the junction
temperature exceeds the maximum allowable
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 the temperature.
The output capacitors must be located as close to
the Vout terminal of the device as possible. It is
recommended to use a section of a layer of the PC
board as a plane to connect the Vout pin to the
output capacitors to prevent any high frequency
oscillation that may result due to excessive trace
inductance.
Anachip Corp.
www.anachip.com.tw
Rev.1.0 Aug.27, 2004
5/10
AP1084
5A Low Dropout Positive Adjustable or Fixed-Mode Regulator
Performance Characteristics
2. 0
1. 8
1. 6
1. 4
1. 2
1. 0
0. 8
0. 6
0. 4
0. 2
0
0.20
0
I load=1.5A
-0.20
-0.40
-0.80
- 1
Tj = 25 oC
Tj = 125 oC
25
Temperature (oC)
Load Regulation vs Temperature
50
75
100
125
-25
0
1
2
Output Current (A)
Dropout Voltage vs Output Current
3
4
5
0
2
1.5
1
1
0.8
0. 5
0
0.6
0.4
-0.5
- 1
0.2
0
-1.5
- 2
-50 -25
0
25
50
75
100 125 150
6
8
10
12
2
4
Temperature (oC)
Input Voltage (V)
Percent Change in Output Voltage vs Temperature
Line Regulation
7.5
60
40
Cin=1uF
Cin=1uF
Cout=10uF Tantalum
6.5
Cout=10uF Tantalum
Preload=100mA
20
0
5.5
40
-20
-40
6
20
0
4
-20
2
-40
0
0
20 40 60 80 100 120 140 160 180 200
TIME (us)
Line Transient Response
20 30 40 50 60 70 80 90 100
TIME (us)
0
10
Load Transient Response
Anachip Corp.
www.anachip.com.tw
Rev.1.0 Aug.27, 2004
6/10
AP1084
5A Low Dropout Positive Adjustable or Fixed-Mode Regulator
Marking Information
( Top View)
Logo
Part Number
1084 for ADJ
84-VV : 15 for 1.5V
18 for 1.8V
84-VV
Blank: normal
YYWWX X
L: Lead Free Package
25 for 2.5V
33 for 3.3V
50 for 5V
YY : Year
WW: Nth week
X
: Internal code ( Optional)
(TO252-3L)
( Top View)
Logo
1084-VV
Part Number
VV : 15 for 1.5V
18 for 1.8V
25 for 2.5V
33 for 3.3V
50 for 5V
YYWWX X
Blank: normal
L: Lead Free Package
YY : Year
WW: Nth week
: Internal code ( Optional)
Blank for ADJ
X
(TO220-3L / TO263-3L)
Anachip Corp.
www.anachip.com.tw
Rev.1.0 Aug.27, 2004
7/10
AP1084
5A Low Dropout Positive Adjustable or Fixed-Mode Regulator
Package Dimension
(1) TO263-3L
10.9
E
2.54
1.3
e
b
b2
Land Pattern Recommendation (Unit: mm)
L1
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min.
4.06
0.51
1.14
Nom.
4.45
0.75
Max.
4.83
0.99
1.40
Min.
0.160
0.020
0.045
Nom.
0.175
0.030
Max.
0.190
0.039
0.055
A
b
b2
1.27
0.050
C
C2
D
0.38 TYP.
1.27
0.015 TYP.
0.050
1.14
8.65
9.65
1.40
9.65
10.29
0.045
0.341
0.380
0.055
0.380
0.405
9.15
9.97
0.360
0.393
E
e
L
L1
L2
L3
2.54 BSC.
15.24
2.54
0.100 BSC.
0.600
14.61
2.28
-
15.88
2.80
2.92
1.78
0.575
0.090
-
0.625
0.100
0.051
0.060
0.110
0.115
0.070
1.30
1.52
1.27
0.050
Anachip Corp.
www.anachip.com.tw
Rev.1.0 Aug.27, 2004
8/10
AP1084
5A Low Dropout Positive Adjustable or Fixed-Mode Regulator
(2) TO252-3L
5.6
E
b2
2.25
1.2
Land Pattern Recommendation (Unit: mm)
H
b
e
e1
L
SEATING PLANE
Notes:
1.
2.
JEDEC Outline: TO-252 AB
Mils suggested for positive contact at mounting.
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min.
2.18
1.02
Nom.
2.29
1.15
Max.
2.39
1.27
Min.
0.086
0.040
Nom.
0.090
0.045
Max.
0.094
0.050
A
A1
b
b2
C
C1
D
E
0.61 TYP.
5.35
0.024 TYP.
0.211
5.20
0.46
0.46
5.33
6.35
5.50
0.58
0.58
5.80
6.80
0.205
0.018
0.018
0.210
0.250
0.217
0.023
0.023
0.228
0.268
0.52
0.52
5.57
6.58
0.020
0.020
0.219
0.259
e
e1
H
L
L1
2.25 BSC.
4.50 BSC.
9.70
0.089 BSC.
0.177 BSC.
0.382
9.00
0.51
0.64
1.52
10.40
-
1.02
0.354
0.020
0.025
0.060
0.409
-
0.040
-
-
0.83
1.78
0.033
0.070
L2
2.03
0.080
Anachip Corp.
www.anachip.com.tw
Rev.1.0 Aug.27, 2004
9/10
AP1084
5A Low Dropout Positive Adjustable or Fixed-Mode Regulator
(3) TO220-3L
A
E
F
ΦP
H1
b1
C
b
J1
e
e1
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min.
3.55
1.14
0.51
0.31
14.20
9.70
2.29
4.83
0.51
5.84
2.03
12.72
3.66
3.53
2.54
Nom.
4.20
1.46
0.83
0.72
15.35
10.20
2.54
5.08
0.95
6.35
2.48
13.72
5.00
3.81
2.98
Max.
4.85
1.78
1.14
1.14
16.50
10.70
2.79
5.33
1.40
6.86
2.92
14.72
6.35
4.09
3.43
Min.
Nom.
0.165
0.057
0.033
0.028
0.604
0.402
0.100
0.200
0.037
0.250
0.098
0.540
0.197
0.150
0.117
Max.
0.191
0.070
0.045
0.045
0.650
0.421
0.110
0.210
0.055
0.270
0.115
0.580
0.250
0.161
0.135
A
b1
b
C
D
0.140
0.045
0.020
0.012
0.559
0.382
0.090
0.190
0.020
0.230
0.080
0.501
0.144
0.139
0.100
E
e
e1
F
H1
J1
L
L1
øP
Q
Anachip Corp.
www.anachip.com.tw
Rev.1.0 Aug.27, 2004
10/10
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