AP1084TG-U [DIODES]
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： | AP1084TG-U |
| 厂家： | 
DIODES INCORPORATED |
| 描述： | 5A LOW DROPOUT POSITIVE ADJUSTABLE OR FIXED-MODE REGULATOR |
| 文件： | 总10页 (文件大小：162K) |
| 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
General Description
Features
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.
•
•
•
•
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 Package: TO252-3L, TO263-3L, and
TO220-3L
•
•
•
•
•
TO252-3L: Available in “Green” Molding Compound
(No Br, Sb) (Note 1)
Lead Free Finish/RoHS Compliant for Lead Free
products (Note 2)
Ordering Information
AP1084 X XX
X
X
Package
D : TO252-3L
K : TO263-3L
T : TO220-3L
Vout
Lead Free
Packing
Blank : Adj
15 = 1.5V
18 = 1.8V
25 = 2.5V
33 = 3.3V
50 = 5.0V
-U : Tube
-13 : Taping
L : Lead Free
G : Green (Note 1)
Note:
1. Green is only available for TO252-3L.
2. RoHS revision 13.2.2003. Glass and High Temperature Solder Exemptions Applied, see EU Directive Annex Notes 5 and 7.
Tube/Bulk
13” Tape and Reel
Package Packaging
Device
Part Number
Part Number
Code
(Note 3)
Quantity
Quantity
Suffix
-U
Suffix
-13
AP1084D
AP1084K
AP1084T
D
K
T
TO252-3L
TO263-3L
TO220-3L
80
50
50
2500/Tape & Reel
800/Tape & Reel
NA
-U
-U
-13
NA
Lead-free
Lead-free
Note:
3. 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. 1
1 of 10
FEBRUARY 2007
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© Diodes Incorporated
AP1084
5A LOW DROPOUT POSITIVE ADJUSTABLE OR
FIXED-MODE REGULATOR
Block Diagram
3
2
V
in
V
out
+
+
-
+
1.25V
CURRENT
LIMIT
+
Thermal
Shutdown
1
Adj
Pin Assignment
TO263-3L
TO252-3L
FRONT VIEW
3
FRONT VIEW
Vin
Vin
3
2
Vout
Vout
2
1
Adj (GND)
1
Adj (GND)
Tab is V
Tab is V
out
out
TO220-3L
FRONT VIEW
3
2
1
Vin
Vout
Adj (GND)
Tab is V
out
AP1084 Rev. 1
2 of 10
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FEBRUARY 2007
© Diodes Incorporated
AP1084
5A LOW DROPOUT POSITIVE ADJUSTABLE OR
FIXED-MODE REGULATOR
Pin Description
Function
Name
I/O
I
TO263/
252/220
Adjustable (Ground only for fixed mode)
A resistor divider from this pin to the Vout pin and ground sets the
output voltage (Ground only for Fixed-Mode).
Adj
(GND)
1
2
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.
Vout
O
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.
Vin
I
3
Absolute Maximum Ratings
Symbol
Parameter
Rating
-0.3 to 12
-65 to +150
0 to +125
150
Unit
DC Supply Voltage
V
Vin
TST
TOP
TM
o
Storage Temperature
C
o
Operating Junction Temperature Range
Maximum Junction Temperature
C
o
C
AP1084 Rev. 1
3 of 10
FEBRUARY 2007
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© Diodes Incorporated
AP1084
5A LOW DROPOUT POSITIVE ADJUSTABLE OR
FIXED-MODE REGULATOR
Electrical Characteristics (Under Operating Conditions)
Sym.
Parameter
Conditions
Min.
Typ.
Max.
Unit
Io = 10mA, TA = 25oC, (Vin-Vout) = 1.5V
IO = 10mA, VOUT+1.5V<VIN<12V, TA = 25oC
IOUT = 10mA, TA = 25oC, 3V≦VIN≦12V
IOUT = 10mA, TA = 25oC, 3.3V≦VIN≦12V
IOUT = 10mA, TA = 25oC, 4V≦VIN≦12V
IOUT = 10mA, TA = 25oC, 4.8V≦VIN≦12V
IOUT = 10mA, TA = 25oC, 6.5V≦VIN≦12V
VREF Reference Voltage
AP1084-XXX
1.225
1.250
1.275
0.2
V
%
V
V
V
V
V
AP1084-1.5
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
AP1084-1.8
Regula
AP1084-2.5
tion
AP1084-3.3
AP1084-5.0
VIN = 3.3V, 0mA<Io<5A, TA = 25oC
C
AP1084-Adj
AP1084-1.5
1
%
VIN = 3V, 0mA<Io<5A, TA = 25oC
(Note 4, 5)
12
15
20
26
15
18
25
33
mV
mV
mV
mV
mV
VIN = 3.3V, 0mA<Io<5A
TA = 25oC (Note 4, 5)
VIN = 4V, 0mA < Io < 5A
TA = 25oC (Note 4, 5)
VIN = 5V, 0mA < Io < 5A, TA = 25oC
(Note 4, 5)
Load AP1084-1.8
Regula
tion
AP1084-2.5
AP1084-3.3
AP1084-5.0
VIN = 8V, 0mA < Io < 5A, TA = 25oC
(Note 4, 5)
40
50
Dropout Voltage
Current Limit
1.3
1.4
V
A
∆Vo
Io = 5.0A (∆Vout = 1% Vout
Vin-Vout = 5V
)
5.1
Minimum Load
Current
Temperature
Stability
5
10
mA
%
0.5
Io = 10mA
Thermal Resistance
Junction-to-Ambient
(No heat sink; No
air flow)
TO252-3L
TO263-3L
TO220-3L
98
95
83
θJA
OC/W
OC/W
TO252-3L: Control Circuitry/Power Transistor
TO263-3L: Control Circuitry/Power Transistor
TO220-3L: Control Circuitry/Power Transistor
10
19
13
Thermal Resistance
Junction-to-Case
θJC
Note:
4. 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.
5. 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.
AP1084 Rev. 1
4 of 10
FEBRUARY 2007
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© Diodes Incorporated
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
100uF
C1
100uF
V
in
V
in
V
out
2.5V/5A
V
out
3.3V/5A
Ω
Ω
R1
R2
121
121
C2
100uF
C2
100uF
Adj
GND
Tab is V
Tab is V
out
out
R2
R1
VO = VREF∗ (1+
)
Note:
AP1084 Rev. 1
5 of 10
FEBRUARY 2007
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© Diodes Incorporated
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 1.25V to Vin-1.4V. The AP1084 only needs 1.4V differential between V and V to
in
out
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 Vin-1.4V with the addition of R1 and R2 external resistors
according to the following formula:
V
= V (1+ R2/R1) +I *R2 , where V = 1.25 typically, I
=
adj
out
ref
adj
ref
55uA typically R1 & R2 as shown below:
V
V
out
in
AP1084
Adj
V
R1
R2
ref
I
= 55uA
adj
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.
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 V pin of the regulator and not to the load. It is important to note that for high current applications, this can re-present a
out
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.
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 that temperature.
Layout Consideration
The output capacitors must be located as close to the V terminal of the device as possible. It is recommended to use a section of
out
a layer of the PC board as a plane to connect the V pin to the output capacitors to prevent any high frequency oscillation that may
out
result due to excessive trace inductance.
AP1084 Rev. 1
6 of 10
FEBRUARY 2007
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© Diodes Incorporated
AP1084
5A LOW DROPOUT POSITIVE ADJUSTABLE OR
FIXED-MODE REGULATOR
Performance Characteristics
2. 0
1. 8
1. 6
1. 4
0.20
0
I load=1.5A
-0.20
-0.40
-0.80
- 1
Tj = 25 oC
1. 2
1. 0
0. 8
0. 6
0. 4
0. 2
0
Tj = 125 oC
25
50
75
100
125
-25
0
1
2
3
4
5
0
Temperature (oC)
Output Current (A)
Dropout Voltage vs Output Current
Load Regulation vs Temperature
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)
Line Regulation
Percent Change in Output Voltage vs Temperature
7.5
60
40
Cin=1uF
Cout=10uF Tantalum
Preload=100mA
Cin=1uF
Cout=10uF Tantalum
6.5
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)
20 30 40 50 60 70 80 90 100
TIME (us)
Load Transient Response
0
10
Line Transient Response
AP1084 Rev. 1
7 of 10
FEBRUARY 2007
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© Diodes Incorporated
AP1084
5A LOW DROPOUT POSITIVE ADJUSTABLE OR
FIXED-MODE REGULATOR
Marking Information
(1) TO252-3L
(Top view)
L : Lead Free
G : Green
Logo
Part Number
84-VV
YY WW X X
1084 for ADJ
84-VV:15 for 1.5V
18 for 1.8V
Internal Code
Xth Week: 01~52
Year: "01" = 2001
"02" = 2002
25 for 2.5V
33 for 3.3V
50 for 5.5V
(2) TO220-3L / TO263-3L
( 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
L : Lead Free
1084-VV
YY WW X X
Internal code
Xth week:01~52
Year: "01" = 2001
"02" = 2002
Blank for ADJ
AP1084 Rev. 1
8 of 10
FEBRUARY 2007
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© Diodes Incorporated
AP1084
5A LOW DROPOUT POSITIVE ADJUSTABLE OR
FIXED-MODE REGULATOR
Package Information (unit: mm)
(1) TO263-3L
10.9
9.65/10.29 Typ 9.97
2.54
Land Pattern Recommendation (Unit: mm)
0.38 Typ
1.3
2.54
BSC.
0.51/0.99 Typ 0.75
1.14/1.40 Typ1.27
2.28/2.80 Typ 2.54
(2) TO252-3L
5.6
6.354/6.80 Typ 6.58
5.20/5.50 Typ 5.35
2.25
1.2
Land Pattern Recommendation (Unit: mm)
2.18/2.40
2.28
BSC.
4.57 BSC.
0.61 Typ
0.64/1.02
Typ 0.83
0.89/
1.14
Typ 2.29
9.00/10.40 Typ 9.70
SEATING
PLANE
0.45/0.58
Typ 0.52
0.51
0.45/0.58
Typ 0.52
AP1084 Rev. 1
9 of 10
www.diodes.com
FEBRUARY 2007
© Diodes Incorporated
AP1084
5A LOW DROPOUT POSITIVE ADJUSTABLE OR
FIXED-MODE REGULATOR
Package Information (Continued)
(3) TO220-3L
3.55/4.85
Typ 4.20
9.70/10.70
2.54/3.43
0.51/1.40
Typ 0.95
∅ 3.53/4.09
Typ 10.20
Typ 2.98
Typ 3.81
5.84/6.86
Typ 6.35
3.66/6.35
Typ 5.00
1.14/1.78
Typ 1.46
0.31/1.14
Typ 0.72
0.51/1.14
Typ 0.83
2.03/2.92
Typ 2.48
2.99/2.79
Typ 2.54
4.83/5.33
Typ 5.08
IMPORTANT NOTICE
Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further
notice to any product herein. Diodes Incorporated does not assume any liability arising out of the application or use of any product described herein; neither
does it convey any license under its patent rights, nor the rights of others. The user of products in such applications shall assume all risks of such use and will
agreeto hold DiodesIncorporatedand all the companieswhose productsare represented onour website, harmlessagainst all damages.
LIFE SUPPORT
Diodes Incorporated productsare notauthorizedfor use ascriticalcomponentsin lifesupportdevices or systemswithout theexpressed written approval ofthe
PresidentofDiodesIncorporated.
AP1084 Rev. 1
10 of 10
FEBRUARY 2007
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© Diodes Incorporated
相关型号：
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