NOT RECOMMENDED FOR NEW DESIGN
USE AZ1084C
AP1084
5A LOW DROPOUT POSITIVE ADJUSTABLE OR
FIXED-MODE REGULATOR
Features
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
Lead Free Packages: TO252-3L, TO263-3L and
TO220-3L
TO252-3L, TO263-3L and TO220-3L: Available in
“Green” Molding Compound (No Br, Sb)
Lead Free Finish/RoHS Compliant (Note 1)
General Description
AP1084 is a low dropout positive adjustable or fixed-mode
regulator with 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.
Typical Application Circuit
5.0V to 3.3V Fixed Mode Regulator
5V
C1
100uF
V
in
V
out
GND
Tab is V
out
3.3V/5A
C2
100uF
V
in
V
out
Adj
Tab is V
out
R1 121Ω
R2 121Ω
C2
100uF
2.5V/5A
5V
Adjustable Regulator
C1
100uF
Note: V
O
½
V
REF
(1
R
2
R
1
)
AP1084 Rev. 9
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Diodes Incorporated
AP1084
5A LOW DROPOUT POSITIVE ADJUSTABLE OR
FIXED-MODE REGULATOR
Ordering Information
AP1084 X XX X - X
Package
D : TO252-3L
K : TO263-3L
T : TO220-3L
Vout
Blank = Adj
15 = 1.5V
18 = 1.8V
25 = 2.5V
33 = 3.3V
50 = 5.0V
Packaging
(Note 2)
TO252-3L
TO252-3L
TO263-3L
TO263-3L
TO220-3L
TO220-3L
Lead Free
L : Lead Free
G : Green
Packing
U : Tube
13 : Tape & Reel
Device
AP1084DXXL-13
AP1084DXXG-13
AP1084KXXL-13
AP1084KXXG-13
AP1084TXXL-U
AP1084TXXG-U
Notes:
Package
Code
D
D
K
K
T
T
Tube
Part Number
Quantity
Suffix
NA
NA
NA
NA
NA
NA
NA
NA
50
-U
50
-U
13” Tape and Reel
Part Number
Quantity
Suffix
2500/Tape & Reel
-13
2500/Tape & Reel
-13
800/Tape & Reel
-13
800/Tape & Reel
-13
NA
NA
NA
NA
1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at
http://www.diodes.com/products/lead_free.html.
2. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at
http://www.diodes.com/datasheets/ap02001.pdf.
AP1084 Rev. 9
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Diodes Incorporated
AP1084
5A LOW DROPOUT POSITIVE ADJUSTABLE OR
FIXED-MODE REGULATOR
Pin Assignment
(1) TO252-3L
(2) TO263-3L
( Top View )
3
2
1
Tab is V
OUT
(3) TO220-3L
( Top View )
V
IN
3
V
IN
V
OUT
Adj (GND)
V
OUT
Adj (GND)
2
1
Tab is V
OUT
( Top View)
3
2
1
Tab is V
OUT
V
IN
V
OUT
Adj (GND)
Pin Description
Pin Name I/O
Adj (GND)
I
Pin #
1
Description
Adjustable (Ground only for fixed mode)
A resistor divider from this pin to the V
OUT
pin and ground sets the output voltage
(Ground only for Fixed-Mode).
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.
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
(1.3V) higher than V
OUT
in order for the device to regulate properly.
V
OUT
O
2
V
IN
I
3
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Diodes Incorporated
AP1084
5A LOW DROPOUT POSITIVE ADJUSTABLE OR
FIXED-MODE REGULATOR
Block Diagram
V
in
3
2
V
out
+
+
-
CURRENT
LIMIT
+
Thermal
Shutdown
1
Adj
1.25V
+
-
Absolute Maximum Ratings
Symbol
V
IN
T
ST
T
MJ
Parameter
DC Supply Voltage
Storage Temperature
Maximum Junction Temperature
Rating
-0.3 to 12
-65 to +150
150
Unit
V
oC
oC
Recommended Operating Conditions
Symbol
T
OP
Parameter
Operating Junction Temperature Range
Min
0
Max
125
Unit
oC
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AP1084
5A LOW DROPOUT POSITIVE ADJUSTABLE OR
FIXED-MODE REGULATOR
Electrical Characteristics
Symbol
V
REF
Parameter
(Under Operating Conditions)
Conditions
Io = 10mA,
T
A
= 25 C, (V
IN
-V
OUT
) = 1.5V
I
O
= 10mA, V
OUT
+1.5V<V
IN
<12V,
T
A
= 25 C
o
I
OUT
= 10mA,
T
A
= 25 C, 3V≦V
IN
≦12V
o
I
OUT
= 10mA,
T
A
= 25 C, 3.3V≦V
IN
≦12V
o
I
OUT
= 10mA,
T
A
= 25 C, 4V≦V
IN
≦12V
o
I
OUT
= 10mA,
T
A
= 25 C, 4.8V≦V
IN
≦12V
o
I
OUT
= 10mA,
T
A
= 25 C, 6.5V≦V
IN
≦12V
o
V
IN
= 3.3V, 0mA<Io<5A,
T
A
= 25 C
o
V
IN
= 3V, 0mA<Io<5A,
T
A
= 25 C
(Note 3, 4)
V
IN
= 3.3V, 0mA<Io<5A
o
T
A
= 25 C (Note 3, 4)
V
IN
= 4V, 0mA < Io < 5A
o
T
A
= 25 C (Note 3, 4)
o
V
IN
= 5V, 0mA < Io < 5A,
T
A
= 25 C (Note 3, 4)
o
V
IN
= 8V, 0mA < Io < 5A,
T
A
= 25 C
(Note 3, 4)
o
o
Min
1.225
1.470
1.764
2.450
3.235
4.900
Typ.
1.250
1.500
1.800
2.500
3.300
5.000
12
15
20
26
40
1.3
Max
1.275
0.2
1.530
1.836
2.550
3.365
5.100
1
15
18
25
33
50
1.4
Unit
V
%
V
V
V
V
V
%
mV
mV
mV
mV
mV
V
A
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
AP1084-3.3
AP1084-5.0
Vo
T
SD
θ
JA
θ
JC
Dropout
I
o
= 5.0A (V
OUT
= 1% V
OUT
)
Voltage
Current Limit V
IN
-V
OUT
= 5V
Minimum Load
Current
Temperature
I
o
= 10mA
Stability
Thermal
Shutdown
Temperature
Thermal
TO220-3L
Resistance
TO252-3L
Junction-to-
Ambient
TO263-3L
(Note 5)
TO220-3L:Control Circuitry/Power Transistor
Thermal
Resistance
TO252-3L:Control Circuitry/Power Transistor
Junction-to-
Case (Note 5) TO263-3L:Control Circuitry/Power Transistor
5.1
5
0.5
150
78
73
60
3.5
12
3.5
O
O
10
mA
%
O
C
C/W
C/W
Notes:
3. 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.
4. 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.
5. Test conditions for TO220-3L, TO252-3L and TO263-3L: Devices mounted on FR-4 substrate, single sided PC board, 2oz copper, with minimum
recommended pay layout, no air flow. The case point of θ
JC
is located on the thermal tab.
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PCB Design
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