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AP1184
4A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR FIXED-MODE REGULATOR
Features
* * * * * * * * 0.85V maximum dropout voltage at 4A load current Built-in Thermal shutdown Output current limiting Adjustable or fixed output voltage 1.5V, 1.8V, 2.5V, 3.3V, 5.0V Fast transient response Good noise rejection Packages: SOP-8L, TO220-5L and TO263-5L Lead Free Finish/RoHS Compliant for Lead Free products (Note 1)
General Description
AP1184 is a 4A regulator with extremely low dropout voltage. This product is specifically designed to provide well regulated supply for applications requiring 2.8V or lower voltages from 3.3V ATX power supplies where high efficiency of the switch can be achieved without the cost and complexity associated with switching regulator. One such application is the new graphic chipsets that requires anywhere from 2.4V to 2.7V supply.
Ordering Information
AP1184 XX - X Package
S:SOP-8L K5:TO263-5L T5:TO220-5L Vout Blank : Adj 15 = 1.5V 18 = 1.8V 25 = 2.5V 33 = 3.3V 50 = 5.0V
X
X
Lead Free L : Lead Free Packing -U : Tube -13 : Taping
Note:
1. RoHS revision 13.2.2003. Glass and High Temperature Solder Exemptions Applied, see EU Directive Annex Notes 5 and 7.
Device
Lead-free
Tube/Bulk Package Packaging Part Number Code (Note 2) Quantity Suffix
S K5 T5 SOP-8L TO263-5L TO220-5L 100 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
AP1184S AP1184K5 AP1184T5
Note:
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.
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AP1184
4A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR FIXED-MODE REGULATOR
Pin Assignments
Adj(GND) Vsense Vctrl Vin
. 1
2 3 4
FRONT VIEW
8 7 6 5 NC Vout Vout Vin
5 4 3 2 1 Tab is Vout
Vin Vctrl Vout Adj(GND) Vsense
SOP-8L
FRONT VIEW 5 4 3 2 1 Tab is Vout Vin Vctrl Vout Adj(GND) Vsense
TO263-L
TO220-5L
Pin Descriptions
Pin Numbers with standard type are for TO220-5L, TO263-5L packages, and those with boldface type are for SOP-8L
Name Adj (GND) Vsense
I/O
I
Vin
I
Vctrl NC Vout
I
O
Description A resistor divider from this pin to the Vout pin and ground sets the output voltage. (GND only for fixed mode) This pin is the positive side of the reference that allows remote load sensing to achieve excellent load regulation. A minimum of 10uF capacitor must be connected from this pin to ground to insure stability. The input of the 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 higher than Vout in order for the device to regulate. This pin is the supply pin for the internal control circuit as well as the base drive for the pass transistor. This pin must always be higher than the Vout pin in order to regulate the device. A minimum of 100uF capacitor must be connected from this pin to ground to insure stability. No connection The output of the regulator. A minimum of 100uF capacitor must be connected from this pin to ground to insure stability.
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AP1184
4A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR FIXED-MODE REGULATOR
Block Diagram
Vin Vctrl + + CURRENT LIMIT THERMAL SHUTDOWN 1.25V + Adj + Vout Vsense
Typical Application Circuit
3.3V + 470uF
G ND Vsense 5V + 470uF Vin Vctrl
.
NC Vout 2.5V/4A Vout Vin + 470uF
AP1184-2.5V
Absolute Maximum Ratings
Symbol VIN Vctrl PD TST TOP Parameter Input Voltage Control Input voltage Power dissipation Storage temperature Range Operation Junction Temperature Range Rating 16 18 Internally limited -65 to +150 0 to +125 Unit V V
o o
C C
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AP1184
4A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR FIXED-MODE REGULATOR
Electrical Characteristics
( Under Operating Conditions )
o o
Unless otherwise specified, these specifications apply over, Cin = 1uF, Cout = 10uF, and Tj = 0 to 150 C. Typical value refer to TA = 25 C. Vout = Vsense.
Sym.
Parameter
Test Condition
Io =10mA, TA = 25 C, (Vin-Vout) = 0.7V, AP1184-Adj Vctrl = VIN+1V o I = 10mA, VOUT+0.7Vo
Min. Typ.
1.225 1.250
Max. Unit
1.275 0.2 V % V V V V V % mV mV mV mV mV V
VREF Reference Voltage Line Regulation
1.470 1.500 1.764 1.800 2.450 2.500 3.235 3.300 4.900 5.000
1.530 1.836 2.550 3.365 5.100 1
Vout
Output Voltage
12 15 20 26 40
15 18 25 33 50 1.15 1.18 1.25 0.38 0.60 0.85 10 0.02
Load Regulation
Dropout Voltage (Vctrl -Vout) Dropout Voltage (Vin - Vout)
1.10 0.26 0.50 0.70 4.2 5 0.01 60 70 6 30 33
V A mA %/W dB
Current Limit Minimum Load Vctrl = 5V, Vin = 3.3V, Vadj = 0V Current Thermal Regulation 30mS Pulse Vctrl = 5V, Vin = 5V, Io = 4A, Vadj = 0V, Tj = 25, Vripple =1Vpp Ripple Rejection at 120Hz Vadj = 0V for all conditions below. Vctrl = 2.75V, Vin = 2.05V, Io = 1.5A Control Pin Current Vctrl = 2.75V, Vin = 2.05V, Io = 3A Vctrl = 2.75V, Vin = 2.05V, Io = 4A
25 60 70
mA
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AP1184
4A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR FIXED-MODE REGULATOR
Electrical Characteristics
( Continued )
Unless otherwise specified, these specifications apply over, Cin = 1uF, Cout = 10uF, and Tj = 0 to 150 C. Typical value refer to TA = 25 C. Vout = Vsense.
o
o
Sym. I adj
Parameter
Adjust Pin Current
Test Condition
Vctrl = 2.75V, Vin = 2.05,Vadjj = 0 TO263-3L: Control Circuitry/Power Transistor (Note 4) TO220-3L: Control Circuitry/Power Transistor (Note 4) SOP-8L: Control Circuitry/Power Transistor (Note 5) TO263-3L: Control Circuitry/Power Transistor (Note 4) TO220-3L: Control Circuitry/Power Transistor (Note 4) SOP-8L: Control Circuitry/Power Transistor (Note 5)
Min. Typ.
50 23 15 118 3.5 2.5 5.4
Max. Unit
150
O O
A C/W C/W O C/W O C/W O C/W O C/W
JA Thermal Resistance
Junction-to-Ambient
JC Thermal Resistance
Junction-to-Case
Note:
3. AP1184-ADJ incorporates an internal thermal shutdown that protects the device when the junction temperature exceeds the allowable maximum junction temperature. 4. Test conditions for TO263-3L and TO220-3L: with copper area of approximately 3in2, 1oz. 5. Test conditions for SOP-8L: mounted on 2oz. copper, minimum recommended pad layout, FR-4 PCB.
Package Max Pd. TO263-3L/TO220-3L 2.4W~4.4W SOP-8L 1W~2W
Remarks With heat sink or amount of copper board needed. With heat sink or amount of copper board needed.
Functional Descriptions
Introduction The AP1184 regulator is a 5 terminal device designed specifically to provide extremely low dropout voltages comparable to the PNP type without the disadvantage of the extra power dissipation due to the base current associated with PNP regulators. This is done by bringing out the control pin of the regulator that provides the base current to the power NPN and connecting it to a voltage that is greater than the voltage present at the Vin pin. This flexibility makes the AP1184 ideal for applications where dual inputs are available such as a computer motherboard with an ATX style power supply that provides 5V and 3.3V to the board. One such application is the new graphic chip sets that require anywhere from 2.4V to 2.7V supply. The AP1184 can easily be programmed with the addition of two external resistors to any voltages within the range of 1.25V to 15.5V. Another major requirement of these graphic chips is the need to switch the load current from zero to several amps in tens of nanoseconds at the processor pins, which translates to an approximately 300 to 500ns of current step at the regulator. In addition, the output voltage tolerances are also extremely tight and they include the transient response as part of the specification. The AP1184 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 number of output capacitors. Another feature of the device is its true remote sensing capability that allows accurate voltage setting at the load rather than at the device. Output Voltage Setting The AP1184-ADJ can be programmed to any voltages in the range of 1.25V to 15.5V with the addition of R1 and R2 external resistors according to the following formula:
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AP1184
4A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR FIXED-MODE REGULATOR
Functional Descriptions
( Continued )
Vout = Vref (1+R2/R1) + Iadj * R2 where : Vref = 1.25V & Iadj=50uA Typically Vin AP1184-ADJ Vctrl Adj Iadj=50uA Vsense Vref R1+ Vout
R2+
The AP1184-ADJ keeps a constant 1.25V between the Vsense pin and the Adj pin. By placing a resistor R1 across these two pins and connecting the Vsense and Vout pin together, 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. This voltage is then 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 AP1184-ADJ is 10mA, R1 is typically selected to be a 121 resistor so that it automatically satisfies this condition. Notice that since the Iadj is typically in the range of 50uA it only adds a small error to the output voltage and should be considered when very precise output voltage setting is required. Load Regulation Since the AP1184 has separate pins for the output (Vout) and the sense (Vsense), it is ideal for providing true remote sensing of the output voltage at the load. This means that the voltage drops due to parasitic resistance such as PCB traces between the regulator and the load are compensated for using remote sensing. Figure following shows a typical application of the AP1184-ADJ with remote sensing.
Vin
Vin Vout AP1184-ADJ Vsense
Vctrl
Vctrl
Adj
R1 R2
RL
Stability The AP1184-XXX requires the use of an output capacitor as part of the frequency compensation in order to make the regulator stable. Typical designs for the microprocessor applications use standard electrolytic capacitors with typical ESR in the range of 50 to 100m and an output capacitance of 100uF to 1000uF. Fortunately as the capacitance increases, the ESR decreases resulting in a fixed RC time constant. The AP1184-XXX takes advantage of the phenomena in making the overall regulator loop stable. For most applications a minimum of 100uF aluminum electrolytic capacitor insures both stability and good transient response. Thermal Design The AP1184-XXX incorporates an internal thermal shutdown that protects the device when the junction temperature exceeds the o allowable maximum 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 this number. The example below shows the steps in selecting the proper surface mount package.
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AP1184
4A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR FIXED-MODE REGULATOR
Functional Descriptions
Assuming, the following conditions: Vout = 2.5V Vin = 3.3V Vctrl = 5V
( Continued )
Iout = 2A DC Avg. Calculate the maximum power dissipation using the following equation: Pd = Iout * ( Vin - Vout) + ( Iout /60) * ( Vctrl - Vout ) Pd = 2 * (3.3-2.5) + (2/60) * (5-2.5) = 1.68W Using table below select the proper package and the amount of copper board needed.
Package SOP-8L TO263-3L
Note:
Copper Area 1.0" X 1.0" Pad Size-1.4"X1.4"
JA (oC/W) 65 25-45
Max Pd (TA = 25oC) 1.7W 2.4W-4.4W
Max Pd (TA = 45oC) 1.4W 2.0W-3.6W
6. Above table is based on the maximum junction temperature of 135oC. As shown in the above table, any of the two packages will do the job. For low cost applications the SOP-8L package is recommended.
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AP1184
4A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR FIXED-MODE REGULATOR
Performance Characteristics
1200 Vpower = 2.05 V Vcontrol Dropout Voltage (mV) Vpower Dropout Voltage (mV) 1100
800 750 700 650 600 550 500 450 400 350 300 250 200 150 100 50 0 Tj = 20 oC Tj = 120 oC
Vcontrol = 2.75 V
1000 Tj = 20 oC 900
Tj = 120 oC
800
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
Output Current (A)
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
Vcontrol Dropout Voltage vs Output Current
Output Current (A)
Vpower Dropout Voltage vs Output Current
0. 15 0. 14 0. 12
1. 253
1. 252
1. 251 0. 10
Reference Voltage (V)
Load Regulation (%)
1. 250
0. 08 0. 06 0. 04 0. 02 0
Tj = 120 oC
1. 249
Tj = 20 oC
1. 248
1. 247
0
20
40 60 80 Junction Temperature ( oC)
100
120
0
0.5
1.0 1.5 2.0 2.5 Output Current (A)
3.0
3.5
4.0
Reference Voltage vs Junction Temperature
Load Regulation vs Output Current
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AP1184
4A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR FIXED-MODE REGULATOR
Performance Characteristic
( Continued )
VCONTROL = 5.0V VPOWER = 3.3V VOUT = 2.5V CCONTROL=10uF CPOWER = 100uF CADJ = 0.1uF COUT = 470uF
ILOAD 10mA to 4A
Transient Response
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AP1184
4A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR FIXED-MODE REGULATOR
Marking Information
(1) SOP-8L
(Top view)
1184-XX: Voltage 1184-15: 1.5V 1184-18: 1.8V 1184-25: 2.5V 1184-33: 3.3V 1184-50: 5.0V
Logo
1184 -XX YY WW X X
L : Lead Free Internal Code Xth week: 01~52 Year: "1" = 2001 "2" = 2002
~
(2) TO263-5L
(Top view) 1184-XX: Voltage 1184-15: 1.5V 1184-18: 1.8V 1184-25: 2.5V 1184-33: 3.3V 1184-50: 5.0V Logo
1184- XX YY WW X X
L : Lead Free Internal Code Xth Week: 01~52 Year: "01" = 2001 "02" = 2002
~
(3) TO220-5L
( Top view )
1184-XX: Voltage 1184-15: 1.5V 1184-18: 1.8V 1184-25: 2.5V 1184-33: 3.3V 1184-50: 5.0V
1184-XX YY WW X X
Logo L : Lead Free Internal code Xth week: 01~52 Year: "01" = 2001 "02" = 2002
~
AP1184 Rev. 1
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AP1184
4A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR FIXED-MODE REGULATOR
Package Information
(1) SOP-8L
( unit: mm )
5.79/6.20
3.70/4.10
0.08/0.25
0.254 0.38/1.27
Gauge Plane Seating Plane
Detail "A"
7~9 1.30/1.50 1.75max. 0.20typ 7~9
0.35max. 45
Detail "A"
3.70/4.10
1.27typ 4.80/5.30
0.3/0.5
(2) TO263-5L
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AP1184
4A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR FIXED-MODE REGULATOR
Package Information
( Continued )
(3) TO220-5L
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.
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