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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 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)
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.
Ordering Information
AP1084 X
Package D : TO252-3L K : TO263-3L T : TO220-3L
XX
X
X
Lead Free L : Lead Free G : Green (Note 1) Packing -U : Tube -13 : Taping
Vout Blank : Adj 15 = 1.5V 18 = 1.8V 25 = 2.5V 33 = 3.3V 50 = 5.0V
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.
Device
AP1084D AP1084K AP1084T
Tube/Bulk Package Packaging Part Number Code (Note 3) Quantity Suffix
D K T TO252-3L TO263-3L TO220-3L 80 50 50 -U -U -U
13" Tape and Reel Part Number Quantity Suffix
2500/Tape & Reel 800/Tape & Reel NA -13 -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
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AP1084
5A LOW DROPOUT POSITIVE ADJUSTABLE OR FIXED-MODE REGULATOR
Block Diagram
Vin
3
2
Vout
+ + CURRENT LIMIT + Thermal Shutdown 1 Adj 1.25V +
Pin Assignment
TO263-3L FRONT VIEW 3 2 1 Tab is Vout TO220-3L FRONT VIEW 3 2 1 Tab is Vout Vin Vout Adj ( GND) Vout Adj ( GND) Vin
TO252-3L FRONT VIEW 3 2 1 Tab is Vout Vout Adj ( GND) Vin
AP1084 Rev. 1
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AP1084
5A LOW DROPOUT POSITIVE ADJUSTABLE OR FIXED-MODE REGULATOR
Pin Description
Function Name Adj (GND) Vout I/O TO263/ 252/220 1 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). The output of the regulator. A minimum of 10uF (0.15 ESR 20) capacitor must be connected from this pin to ground to insure stability. The input pin of regulator. Typically a large storage capacitor (0.15 ESR 20) 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.
I
O
2
Vin
I
3
Absolute Maximum Ratings
Symbol Vin TST TOP TM Parameter DC Supply Voltage Storage Temperature Operating Junction Temperature Range Maximum Junction Temperature Rating -0.3 to 12 -65 to +150 0 to +125 150 Unit V oC oC oC
AP1084 Rev. 1
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AP1084
5A LOW DROPOUT POSITIVE ADJUSTABLE OR FIXED-MODE REGULATOR
Electrical Characteristics
Sym. VREF Parameter
(Under Operating Conditions) Conditions
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
Max. 1.275 0.2 1.530 1.836 2.550 3.365 5.100 1
Unit V % V V V V V % mV mV mV mV mV V A mA %
O
Reference Voltage Io = 10mA, TA = 25 C, (Vin-Vout) = 1.5V AP1084-XXX IO = 10mA, VOUT+1.5VNote:
12 15 20 26 40 1.3 5.1 5 0.5 98 95 83 10 19 13
15 18 25 33 50 1.4 10
C/W
O
C/W
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
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AP1084
5A LOW DROPOUT POSITIVE ADJUSTABLE OR FIXED-MODE REGULATOR
Typical Circuit
(1) TO263/252/220
5.0V to 3.3V Fixed Mode Regulator
5V 5V C1 100uF Vin Vout GND Tab is Vout 3.3V/5A C2 100uF
Adjustable Regulator
C1 100uF
Vin Vout Adj Tab is Vout R1 121 R2 121 C2 100uF 2.5V/5A
Note: VO = VREF (1 +
R2 R1
)
AP1084 Rev. 1
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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 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 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 below: Vin AP1084 Adj Vout Vref R1
Iadj = 55uA
R2
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 121 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=121 and R2=200 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 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.
Thermal Design The AP1084 incorporates an internal thermal shutdown that protects the device when the junction temperature exceeds the o maximum allowable junction temperature. Although this device can operate with junction temperatures in the range of 150 C, 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 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.
AP1084 Rev. 1
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AP1084
5A LOW DROPOUT POSITIVE ADJUSTABLE OR FIXED-MODE REGULATOR
Performance Characteristics
2. 0 1. 8 0.20
Output Voltage Deviation (%)
1. 6
0 I load=1.5A
Dropout Voltage (V)
1. 4 1. 2 1. 0 0. 8 0. 6 0. 4 0. 2 0 0 1 Tj = 125 oC Tj = 25 oC
-0.20
-0.40
-0.80
Dropout Voltage vs Output Current
2 1.5 1
Output Current (A)
2
3
4
5
-1
-25
0
Temperature ( oC)
25
50
75
100
125
Load Regulation vs Temperature
Output Voltage Change (%)
1 0. 5 0 -0.5 -1 -1.5 -2 -50 -25 0 25 50 75 100 125 150
0.8
Output Voltage Deviation (%)
0.6
0.4
0.2
0
Percent Change in Output Voltage vs Temperature
Output Voltage Deviation (mV) Input Voltage (V) Load Current (A) Output Voltage Deviation (mV) 7.5 6.5 5.5 40 20 0 -20 -40 Cin=1uF Cout=10uF Tantalum 60 40 20 0 -20 -40 6 4 2 0 0 10 20
Temperature ( oC)
2
4
Line Regulation
Cin=1uF Cout=10uF Tantalum Preload=100mA
Input Voltage (V)
6
8
10
12
0
20
40
60
TIME (us)
80
100 120 140 160 180 200
30
TIME (us)
40
50
60
70
80
90
100
Line Transient Response
AP1084 Rev. 1
Load Transient Response
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AP1084
5A LOW DROPOUT POSITIVE ADJUSTABLE OR FIXED-MODE REGULATOR
Marking Information
(1) TO252-3L
(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 5.5V
84-VV YY WW X X
L : Lead Free G : Green Internal Code Xth Week: 01~52 Year: "01" = 2001 "02" = 2002
~
(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 Blank for ADJ
1084-VV YY WW X X
L : Lead Free Internal code Xth week: 01~52 Year: "01" = 2001 "02" = 2002
AP1084 Rev. 1
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FEBRUARY 2007
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AP1084
5A LOW DROPOUT POSITIVE ADJUSTABLE OR FIXED-MODE REGULATOR
Package Information
(1) TO263-3L
(unit: mm)
2.92 Typ 1.30
9.65/10.29 Typ 9 .9 7
10.9
14.61/15.88 Typ 15.24
8.65/9.65 Typ 9.15
9.1
1.27/ 1.78 Typ 1.52
2.5 4 BSC.
1.3
2.54
0 .51/0.99 Typ 0 .75 1.14/1.40 T yp1.27
Land P attern R ecom m endation (U nit: m m )
0.38 Typ 4.06/4.83 Typ 4.45
(2) TO252-3L
0.88/1.27 5.6
6.354/6.80 Typ 6.58 5.20/5.50 Typ 5.35
5.40/6.20 Typ 5.57
11.0
5.6
2.25 2.0
7.2 1.2 9.00/10.40 Typ 9.70 2.18/2.40 Typ 2.29 SEE NOTE2 SEATING PLANE 0.45/0.58 Typ 0.52
0.61 Typ
2.28 BSC. 4.57 BSC.
0.64/1.02 Typ 0.83
Land Pattern Recommendation (Unit: mm)
0.89/ 1.14
0.45/0.58 Typ 0.52
0.51
AP1084 Rev. 1
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1.14/1.40 Typ 1.27
2.28/2.80 Typ 2 .54
3
15.7
FEBRUARY 2007
(c) Diodes Incorporated
AP1084
5A LOW DROPOUT POSITIVE ADJUSTABLE OR FIXED-MODE REGULATOR
Package Information
(3) TO220-3L
2.54/3.43 Typ 2.98
(Continued)
9.70/10.70 Typ 10.20
3.53/4.09
Typ 3.81 5.84/6.86 Typ 6.35
3.55/4.85 Typ 4.20
0.51/1.40 Typ 0.95 SEATING PLANE
14.20/16.50 Typ 15.35
3.66/6.35 Typ 5.00
1.14/1.78 Typ 1.46
4.83/5.33 Typ 5.08
0.31/1.14 0.51/1.14 Typ 0.72 Typ 0.83 2.99/2.79 Typ 2.54
12.72/14.72 Typ 13.72
2.03/2.92 Typ 2.48
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 agree to hold Diodes Incorporated and all the companies whose products are represented on our website, harmless against all damages. LIFE SUPPORT Diodes Incorporated products are not authorized for use as critical components in life support devices or systems without the expressed written approval of the President of Diodes Incorporated.
AP1084 Rev. 1
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