AP1084N25L [ICT]
Fixed Positive LDO Regulator, 2.5V, 1.4V Dropout, PDIP8, LEAD FREE, PLASTIC, DIP-8;
| 型号： | AP1084N25L |
| 厂家： | 
InnoChips Technology |
| 描述： | Fixed Positive LDO Regulator, 2.5V, 1.4V Dropout, PDIP8, LEAD FREE, PLASTIC, DIP-8 光电二极管 |
| 文件： | 总11页 (文件大小：215K) |
| 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
• Output current limiting
• Adjustable output voltage or fixed 1.5V, 1.8V, 2.5V, provide well-regulated supply for low voltage IC
3.3V, 5.0V
applications such as high-speed bus termination and
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.
• Fast transient response
• Good noise rejection
• Package: TO252, TO263, TO220, PDIP-8
Ordering Information
AP1084 X
X
X
X
Low Dropout Regulator
Package
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
N : PDIP-8L
L : Lead Free Package
A
: Taping
Block Diagram
Vin
3
2
Vout
+
+
+
1.25V
－
CURRENT
LIMIT
+
Thermal
Shutdown
1
Adj
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.1.2 Jun.9, 2005
1/11
AP1084
5A Low Dropout Positive Adjustable or Fixed-Mode Regulator
Connection Diagram
TO263
TO252
FRONT VIEW
FRONT VIEW
Vin
Vout
Adj (GND)
3
Vin
3
Vout
2
2
1
Adj (GND)
1
Tab is Vout
Tab is Vout
TO220
PDIP-8
FRONT VIEW
TOP VIEW
Vout
3
2
1
1
2
3
4
Vin
8
7
Adj(GND)
Vout
Vout
Vout
Vout
Vout
AP1084
Adj (GND)
6
Vout
Vin
5
Tab is Vout
Pin Descriptions
Pin No.
Name I/O
Function
TO263/
PDIP-8
252/220
Adjustable (Ground only for fixed mode)
Adj
I
1
1
A resistor divider from this pin to the Vout pin and ground sets the
output voltage. (Ground only for Fixed-Mode)
(GND)
The output of the regulator. A minimum of 10uF (0.15Ω ≤ ESR ≤
20Ω) capacitor must be connected from this pin to ground to insure
stability.
2/3/5/6/
7/8
Vout
Vin
O
I
2
3
The input pin of regulator. Typically a large storage capacitor (0.15Ω
≤ ESR ≤ 20Ω) 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
(1.3V) higher than Vout in order for the device to regulate properly.
4
Anachip Corp.
www.anachip.com.tw
Rev.1.2 Jun.9, 2005
2/11
AP1084
5A Low Dropout Positive Adjustable or Fixed-Mode Regulator
Absolute Maximum Ratings
Symbol
Parameter
Rating
-0.3 to 12
Unit
V
Vin
DC Supply Voltage
Power Dissipation
PD
Internally Limited
o
o
TST
Storage Temperature
Operating Junction Temperature Range
-65 to +150
0 to +150
C
C
TOP
Electrical Characteristics (Under Operating Conditions)
Sym.
Parameter
Conditions (Notes)
Min.
1.225
Typ.
1.250
Max.
Unit
V
%
V
V
V
V
V
VREF
Reference Voltage Io=10mA, Tj=25oC, (Vin-Vout)=1.5V
1.275
AP1084-XXX
AP1084-1.5
AP1084-1.8
AP1084-2.5
AP1084-3.3
AP1084-5.0
IO=10mA, VOUT+1.5V<VIN<12V, TJ =25oC
IOUT = 10mA, TJ = 25oC, 3V≦VIN≦12V
IOUT = 10mA, TJ = 25oC, 3.3V≦VIN≦12V
IOUT = 10mA, TJ = 25oC, 4V≦VIN≦12V
IOUT = 10mA, TJ = 25oC, 4.8V≦VIN≦12V
IOUT = 10mA, TJ = 25oC, 6.5V≦VIN≦12V
0.2
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
Line
Regulation
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)
VIN = 8V, 0mA<Io<5A, TJ=25oC (Note 1,2)
Io=5.0A (∆Vout = 1% Vout)
Vin-Vout=5V
26
40
1.3
33
50
1.4
mV
mV
V
∆Vo
5.1
A
5
10
mA
Temperature
Stability
Io=10mA
0.5
%
Thermal Resistance
Junction-to-Ambient
(No heat sink ;No
air flow)
TO-252
TO-263
TO-220
98
83
83
θJA
OC/W
OC/W
Thermal Resistance PDIP-8: Control Circuitry/Power Transistor
Junction-to-Ambient (Note 3)
35
TO-252: Control Circuitry/Power Transistor
10
Thermal Resistance
θJC
TO-263: Control Circuitry/Power Transistor
Junction-to-Case
0.65/2.7
TO-220: Control Circuitry/Power Transistor
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.
Note 3: Output is connected to the PCB cupper area 5.5mm*5.5mm separately. If you need large PD or lower Tc & Tj, please connect to
the large cupper area >> 5.5mm*5.5mm (like 10mm*10mm).
Anachip Corp.
www.anachip.com.tw
Rev.1.2 Jun.9, 2005
3/11
AP1084
5A Low Dropout Positive Adjustable or Fixed-Mode Regulator
Typical Circuit
(1) TO263/252/220
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
C2
C2
100uF
GND
Tab is Vout
100uF
121
Tab is Vout
R2
R1
VO = VREF∗ (1+
)
Note:
(2) PDIP-8
5V/3.3V fixed output
5V/2.5V Adj output
5V
5V
C1
C1
100uF
100uF
Vin
Vin
Vout
Vout
Vout Vout
Vout Vout
GND
Vout
Vout Vout
Vout Vout
Vo
3.3V/1A
2.5V/1A
R1
C2
Adj
C2
Vout
121Ω
100uF
100uF
R2
Ω
121
Tab is Vout
Tab is Vout
R2
R1
VO = VREF∗ (1+
)
Note:
Anachip Corp.
www.anachip.com.tw
Rev.1.2 Jun.9, 2005
4/11
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 1.25V to Vin-1.4V. 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 Vin-1.4V 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.
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.
Thermal Design
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.
Load Regulation
Since the AP1084 is only a 3 terminal device, it is not
possible to provide true remote sensing of the 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
Layout Consideration
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.1.2 Jun.9, 2005
5/11
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.1.2 Jun.9, 2005
6/11
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
YYWWX X
VV : 15 for 1.5V
18 for 1.8V
25 for 2.5V
33 for 3.3V
50 for 5V
Blank: normal
L: Lead Free Package
YY : Year
WW: Nth week
: Internal code ( Optional)
Blank for ADJ
X
(TO220-3L / TO263-3L)
( Top View )
8
1
5
4
Logo
Blank: normal
Part Number
VV : 15 for 1.5V
18 for 1.8V
25 for 2.5V
33 for 3.3V
50 for 5V
1084-VV
L: Lead Free Package
YY WW X X
ID code: internal
Xth week: 01~52
Year: "01" =2001
"02" =2002
Blank for ADJ
(PDIP-8L)
Anachip Corp.
www.anachip.com.tw
Rev.1.2 Jun.9, 2005
7/11
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
C
C2
D
1.27
0.050
0.38 TYP.
1.27
0.015 TYP.
0.050
1.14
8.65
9.65
1.40
9.65
10.29
0.045
0.055
9.15
9.97
0.341
0.380
0.360
0.393
0.380
0.405
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.1.2 Jun.9, 2005
8/11
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
0.89
Nom.
2.29
Max.
2.40
1.14
Min.
0.086
0.035
Nom.
0.090
-
Max.
0.094
0.045
A
A1
b
b2
C
C1
D
E
e
e1
H
L
L1
L2
-
0.61 TYP.
5.35
0.024 TYP.
0.211
0.020
0.020
0.219
0.259
0.090 BSC.
0.180 BSC.
0.382
-
5.20
0.45
0.45
5.40
6.35
5.50
0.58
0.58
6.20
6.80
0.205
0.018
0.018
0.213
0.250
0.217
0.023
0.023
0.244
0.268
0.52
0.52
5.57
6.58
2.28 BSC.
4.57 BSC.
9.70
9.00
0.51
0.64
0.88
10.40
-
1.02
1.27
0.354
0.020
0.025
0.035
0.409
-
0.040
0.050
-
0.83
-
0.033
-
Anachip Corp.
www.anachip.com.tw
Rev.1.2 Jun.9, 2005
9/11
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.1.2 Jun.9, 2005
10/11
AP1084
5A Low Dropout Positive Adjustable or Fixed-Mode Regulator
(4) PDIP-8L
D
E-PIN O0.118 inch
E
(4X)
15
PIN #1 INDENT O0.025 DEEP 0.006-0.008 inch
7
(4X)
C
eB
B
B1
e
S
B2
Dimensions in millimeters
Dimensions in inches
Symbol
Min.
-
0.38
3.1
0.36
1.4
0.81
0.20
9.02
7.62
6.15
-
2.92
8.38
0.71
Nom.
-
Max.
5.33
-
Min.
-
Nom.
-
Max.
0.210
A
A1
A2
B
B1
B2
C
D
E
E1
e
L
-
0.015
0.122
0.014
0.055
0.032
0.008
0.355
0.300
0.242
-
-
-
3.30
0.46
1.52
0.99
0.25
9.27
7.94
6.35
2.54
3.3
3.5
0.130
0.018
0.060
0.039
0.010
0.365
0.313
0.250
0.100
0.130
0.350
0.033
0.138
0.022
0.065
0.045
0.014
0.375
0.325
0.258
-
0.56
1.65
1.14
0.36
9.53
8.26
6.55
-
3.81
9.70
0.97
0.115
0.330
0.028
0.150
0.382
0.038
eB
S
8.89
0.84
Anachip Corp.
www.anachip.com.tw
Rev.1.2 Jun.9, 2005
11/11
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