Anachip AP1084DA 5a low dropout positive adjustable or fixed-mode regulator Datasheet

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
• Output current limiting
• Adjustable output voltage or fixed 1.5V, 1.8V, 2.5V,
3.3V, 5.0V
• Fast transient response
• Good noise rejection
• Package : TO252, TO263, TO220
AP1084 is a low dropout positive adjustable or fixedmode regulator with minimum of 5.0A output current
capability. The product is specifically designed to
provide well-regulated supply for low voltage IC
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.
•
•
„ Ordering Information
AP1084 X
Low Dropout Regulator
X
X
X
Package
Vout
D : TO252-3L
K : TO263-3L
T : TO220-3L
Blank : Adj
15 = 1.5V
18 = 1.8V
25 = 2.5V
33 = 3.3V
50 = 5.0V
Lead Free
Packing
Blank : Normal
Blank : Tube
L : Lead Free Package A : Taping
„ Typical Circuit
5.0V to 3.3V Fixed Mode Regulator
Adjustable Regulator
5V
5V
C1
100uF
C1
100uF
Vin
Vin
Vout
GND
Vout
3.3V/5A
C2
100uF
Adj
2.5V/5A
R1 121Ω
R2 121Ω
C2
100uF
Tab is Vout
Tab is Vout
Note: Vo = VREF ∗ (1+
R2
)
R1
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
Shutdown
1
Adj
„ Connection Diagram
TO263
TO252
FRONT VIEW
FRONT VIEW
Vout
2
1
2
Adj (GND)
Tab is Vout
FRONT VIEW
Vin
3
Vin
3
TO220
Vout
1
3
Vin
2
Vout
1
Adj (GND)
Adj (GND)
Tab is Vout
Tab is Vout
„ Pin Descriptions
NAME
I/O
Adj (GND)
Vout
Vin
O
I
PIN #
FUNCTION
1
Adjustable (Ground only for fixed mode)
2
The output of the regulator. A minimum of 10uF capacitor must be
connected from this pin to ground to insure stability.
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.
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Rev.1.0 Aug.27, 2004
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AP1084
5A Low Dropout Positive Adjustable or Fixed-Mode Regulator
„ Absolute Maximum Ratings
Symbol
Parameter
Rating
Vin
PD
TST
DC Supply Voltage
Power Dissipation
Storage Temperature
TOP
Operating Junction Temperature Range
„ Electrical Characteristics
SYM.
VREF
PARAMETER
Reference Voltage
AP1084-XXX
AP1084-1.5
AP1084-1.8
Line
Regulation AP1084-2.5
AP1084-3.3
AP1084-5.0
AP1084-Adj
AP1084-1.5
Load
Regulation
AP1084-1.8
AP1084-2.5
∆Vo
θ JA
θ JC
AP1084-3.3
AP1084-5.0
Dropout Voltage
Current Limit
Minimum Load
Current
Temperature Stability
Thermal Resistance
Junction-to-Ambient
(No heat sink ;No air
flow)
Thermal Resistance
Junction-to-Case
Unit
-0.3 to 12
V
Internally Limited
oC
-65 to +150
o
0 to +150
C
(Under Operating Conditions)
CONDITIONS (Notes)
Io=10mA, Tj=25oC, (Vin-Vout)=1.5V
o
IO=10mA, VOUT+1.5V<VIN<12V, TJ =25 C
o
IOUT = 10mA, TJ = 25 C, 3V≦VIN≦12V
IOUT = 10mA, TJ = 25oC, 3.3V≦VIN≦12V
o
IOUT = 10mA, TJ = 25 C, 4V≦VIN≦12V
o
IOUT = 10mA, TJ = 25 C, 4.8V≦VIN≦12V
IOUT = 10mA, TJ = 25oC, 6.5V≦VIN≦12V
VIN=3.3V, 0mA<Io<5A, TJ =25oC
(Note 1,2)
o
VIN=3V, 0mA<Io<5A, TJ =25 C
(Note 1,2)
VIN=3.3V, 0mA<Io<5A
o
TJ =25 C (Note 1,2)
VIN=4V, 0mA<Io<5A
o
TJ =25 C (Note 1,2)
o
VIN = 5V, 0mA<Io<5A , TJ=25 C (Note 1,2)
o
VIN = 8V, 0mA<Io<5A, TJ=25 C (Note 1,2)
Io=5.0A (∆Vout = 1% Vout)
Vin-Vout=5V
MIN
1.225
TYP
1.250
MAX
1.275
0.2
1.530
1.836
2.550
3.365
5.100
UNIT
V
%
V
V
V
V
V
1.470
1.764
2.450
3.235
4.900
1.500
1.800
2.500
3.300
5.000
1
%
12
15
mV
15
18
mV
20
25
mV
26
40
1.3
33
50
1.4
mV
mV
V
A
5
10
mA
5.1
Io=10mA
0.5
TO-252
TO-263
TO-220
98
91
83
TO-252: Control Circuitry/Power Transistor
TO-263: Control Circuitry/Power Transistor
TO-220: Control Circuitry/Power Transistor
15
10
0.65/2.7
%
O
C/W
O
C/W
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 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.
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.
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
Iadj=55uA
R2
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.
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.
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
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Rev.1.0 Aug.27, 2004
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AP1084
5A Low Dropout Positive Adjustable or Fixed-Mode Regulator
„ Functional Description (Continued)
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.
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.
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Rev.1.0 Aug.27, 2004
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AP1084
5A Low Dropout Positive Adjustable or Fixed-Mode Regulator
„ Performance Characteristics
0.20
2. 0
Output Voltage Deviation (%)
1. 8
1. 6
Dropout Voltage (V)
1. 4
1. 2
0
I load=1.5A
-0.20
Tj = 25 oC
1. 0
-0.40
0. 8
Tj = 125 oC
0. 6
-0.80
0. 4
0. 2
0
0
1
2
3
-1
5
4
Output Current (A)
-25
Dropout Voltage vs Output Current
0
25
50
Temperature ( oC)
75
100
125
Load Regulation vs Temperature
2
1
0.8
1
0. 5
0
-0.5
-1
-1.5
-2
-50
-25
0
25
50
Temperature ( oC)
75
100
125
150
Output Voltage Deviation (%)
Output Voltage Change (%)
1.5
0.6
0.4
0.2
0
2
4
7.5
Cin=1uF
Cout=10uF Tantalum
6.5
5.5
40
20
0
-20
-40
0
20
40
60
80
100 120 140 160 180 200
TIME (us)
Load Current (A) Output Voltage Deviation (mV)
Output Voltage Deviation (mV) Input Voltage (V)
Percent Change in Output Voltage vs Temperature
Line Transient Response
6
8
10
Input Voltage (V)
12
Line Regulation
60
Cin=1uF
Cout=10uF Tantalum
Preload=100mA
40
20
0
-20
-40
6
4
2
0
0
10
20
30
40
50
TIME (us)
60
70
80
90
100
Load Transient Response
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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
25 for 2.5V
33 for 3.3V
50 for 5V
84-VV
YYWWX X
Blank: normal
L: Lead Free Package
YY : Year
WW: Nth week
X : Internal code ( Optional)
(TO252-3L)
( Top View)
Logo
Part Number
VV : 15 for 1.5V
18 for 1.8V
25 for 2.5V
33 for 3.3V
50 for 5V
Blank for ADJ
1084-VV
YYWWX X
Blank: normal
L: Lead Free Package
YY : Year
WW: Nth week
X : Internal code ( Optional)
(TO220-3L / TO263-3L)
Anachip Corp.
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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
L3
3
L
15.7
D
9.1
L2
E
1.3
b
b2
2.54
Land Pattern Recommendation (Unit: mm)
C2
A
C
e
L1
Symbol
A
b
b2
C
C2
D
E
e
L
L1
L2
L3
Dimensions In Millimeters
Min.
Nom.
Max.
4.06
4.45
4.83
0.51
0.75
0.99
1.14
1.27
1.40
0.38 TYP.
1.14
1.27
1.40
8.65
9.15
9.65
9.65
9.97
10.29
2.54 BSC.
14.61
15.24
15.88
2.28
2.54
2.80
1.30
2.92
1.27
1.52
1.78
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Dimensions In Inches
Min.
Nom.
Max.
0.160
0.175
0.190
0.020
0.030
0.039
0.045
0.050
0.055
0.015 TYP.
0.045
0.050
0.055
0.341
0.380
0.380
0.405
0.575
0.360
0.393
0.100 BSC.
0.600
0.090
0.050
0.100
0.051
0.060
0.110
0.115
0.070
0.625
Rev.1.0 Aug.27, 2004
8/10
AP1084
5A Low Dropout Positive Adjustable or Fixed-Mode Regulator
(2) TO252-3L
5.6
L2
E
7.2
D
11.0
5.6
b2
2.0
2.25
L1
1.2
Land Pattern Recommendation (Unit: mm)
e
e1
Notes:
1.
2.
Symbol
A
A1
b
b2
C
C1
D
E
e
e1
H
L
L1
L2
SEATING PLANE
A
L
SEE NOTE2
A1
C
H
C1
b
JEDEC Outline: TO-252 AB
Mils suggested for positive contact at mounting.
Dimensions In Millimeters
Min.
Nom.
Max.
2.18
2.29
2.39
1.02
1.15
1.27
0.61 TYP.
5.20
5.35
5.50
0.46
0.52
0.58
0.46
0.52
0.58
5.33
5.57
5.80
6.35
6.58
6.80
2.25 BSC.
4.50 BSC.
9.00
9.70
10.40
0.51
0.64
0.83
1.02
1.52
1.78
2.03
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Dimensions In Inches
Min.
Nom.
Max.
0.086
0.090
0.094
0.040
0.045
0.050
0.024 TYP.
0.205
0.211
0.217
0.018
0.020
0.023
0.018
0.020
0.023
0.210
0.219
0.228
0.250
0.259
0.268
0.089 BSC.
0.177 BSC.
0.354
0.382
0.409
0.020
0.025
0.033
0.040
0.060
0.070
0.080
Rev.1.0 Aug.27, 2004
9/10
AP1084
5A Low Dropout Positive Adjustable or Fixed-Mode Regulator
(3) TO220-3L
E
A
F
SEATING PLANE
Q
ΦP
L1
D
H1
L
b1
C
b
J1
e
e1
Symbol
A
b1
b
C
D
E
e
e1
F
H1
J1
L
L1
øP
Q
Dimensions In Millimeters
Min.
Nom.
Max.
3.55
4.20
4.85
1.14
1.46
1.78
0.51
0.83
1.14
0.31
0.72
1.14
14.20
15.35
16.50
9.70
10.20
10.70
2.29
2.54
2.79
4.83
5.08
5.33
0.51
0.95
1.40
5.84
6.35
6.86
2.03
2.48
2.92
12.72
13.72
14.72
3.66
5.00
6.35
3.53
3.81
4.09
2.54
2.98
3.43
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Dimensions In Inches
Min.
Nom.
Max.
0.140
0.165
0.191
0.045
0.057
0.070
0.020
0.033
0.045
0.012
0.028
0.045
0.559
0.604
0.650
0.382
0.402
0.421
0.090
0.100
0.110
0.190
0.200
0.210
0.020
0.037
0.055
0.230
0.250
0.270
0.080
0.098
0.115
0.501
0.540
0.580
0.144
0.197
0.250
0.139
0.150
0.161
0.100
0.117
0.135
Rev.1.0 Aug.27, 2004
10/10
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