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Advanced Power Electronics Corp.
1. Features
* * * * * * * *
APE1085
Pb Free Plating Product
3A Low Dropout Positive Adjustable or Fixed-Mode Regulator General Description
APE1085 is a low dropout positive adjustable or fixed-mode regulator with minimum of 3.0A 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. APE1085 is also well suited for other applications such as VGA cards. APE1085 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 Package : TO252, TO263, TO220 RoHS Compliant
Ordering Information
APE 1085 X XX
Low Dropout Regulator
Package
Vout
H : TO 252-3L Blank : Adj S : TO263-3L 15 = 1.5V P : TO220-3L 18 = 1.8V 25 = 2.5V 33 = 3.3V 50 = 5.0V
Block Diagram
Vin 3 2 Vout
+ + 1.25V CURRENT LIMIT + Thermal Shutdown 1 Adj +
This datasheet contains new product information. Advanced Power Electronics 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.
200313072-1/10
Advanced Power Electronics Corp.
Connection Diagram
TO263 FRONT VIEW 3 2 1 Tab is Vout TO220 FRONT VIEW 3 2 1 Tab is Vout Vin Vout Adj (GND) Vout Adj (GND) Vin TO252
APE1085
Pb Free Plating Product
3A Low Dropout Positive Adjustable or Fixed-Mode Regulator
FRONT VIEW 3 2 1 Tab is Vout Vin Vout Adj (GND)
Pin Descriptions
Name Adj (GND) Vout I/O Pin No. TO263/ PDIP-8 252/220 1 2 1 2/3/5/6/ 7/8 Function 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
Vin
I
3
4
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Advanced Power Electronics Corp.
Absolute Maximum Ratings
Symbol Vin PD TST TOP Parameter DC Supply Voltage Power Dissipation Storage Temperature Operating Junction Temperature Range
APE1085
Pb Free Plating Product
3A Low Dropout Positive Adjustable or Fixed-Mode Regulator
Rating
Unit
-0.3 to 12 V Internally Limited oC -65 to +150 oC 0 to +150
Electrical Characteristics
Sym.
VREF
(Under Operating Conditions) Min.
1.225 1.470 1.764 2.450 3.235 4.900
Parameter
Conditions (Notes)
Io=10mA, Tj=25 C, (Vin-Vout)=1.5V IO=10mA, VOUT+1.5Vo
Typ.
1.250 0.2 1.500 1.800 2.500 3.300 5.000
Max.
1.275 0.5 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 %
Reference Voltage APE1085-XXX APE1085-1.5 APE1085-1.8 Line Regulation APE1085-2.5 APE1085-3.3 APE1085-5.0 APE1085-Adj APE1085-1.5 Load APE1085-1.8 Regulation APE1085-2.5 APE1085-3.3 APE1085-5.0 Dropout Voltage Current Limit Minimum Load Current Temperature Stability Thermal Resistance Junction-to-Ambient (No heat sink ;No air flow)
12 15 20 26 40 1.3 5.1 5
15 18 25 33 50 1.4 10
Vo
Io=10mA TO-252 TO-263 TO-220
0.5 98 83 83
JA
O
C/W
JC
TO-252: Control Circuitry/Power Transistor Thermal Resistance TO-263: Control Circuitry/Power Transistor Junction-to-Case TO-220: Control Circuitry/Power Transistor
10 0.65/2.7 0.65/2.7
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.
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Advanced Power Electronics Corp.
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 3.3V/3A C2 100uF Vin Vout Adj Tab is Vout
APE1085
Pb Free Plating Product
3A Low Dropout Positive Adjustable or Fixed-Mode Regulator
Adjustable Regulator
C1 100uF
2.5V/5A 2.5V/3A R1 121 R2 121 C2 100uF
Note: VO = VREF (1 +
R2 R1
)
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Advanced Power Electronics Corp.
Functional Description
Introduction The APE1085 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 APE1085 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 3.0A load step.
APE1085
Pb Free Plating Product
3A Low Dropout Positive Adjustable or Fixed-Mode Regulator
The APE1085 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 APE1085 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 at below Vin
APE1085 APE1084 Adj
Vout Vref R1
Iadj=55uA R2
The APE1085 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 APE1085 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 APE1085 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
Advanced Power Electronics Corp. www.a-power.com.tw
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 APE1085 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 APE1085 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.
5/10
Advanced Power Electronics Corp.
Performance Characteristics
2. 0 1. 8
APE1085
Pb Free Plating Product
3A Low Dropout Positive Adjustable or Fixed-Mode Regulator
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
Load Transient Response
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Advanced Power Electronics Corp.
Marking Information
( Top View ) Part Number Logo 1085 for ADJ 1085-VV : 15 for 1.5V 18 for 1.8V 25 for 2.5V 33 for 3.3V 50 for 5V 10 85 -VV Y WW SSS
APE1085
Pb Free Plating Product
3A Low Dropout Positive Adjustable or Fixed-Mode Regulator
Y: Year - " 1 : 2001 ~ WW : Xth week - 01 ~52 SSS : Sequence - 001 ~ (TO252-3L)
( Top View ) Part Number
Logo 1085 for ADJ 1085 -VV : 15 for 1.5V
1085 -VV Y WW SSS
18 25 33 50
for 1.8V for 2.5V for 3.3V for 5V
Y: Year - " 1 : 2001 ~ WW : Xth week - 01~52 SSS : Sequence - 001 ~
(TO220-3L / TO263-3L)
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Advanced Power Electronics Corp.
Package Dimension
(1) TO263-3L
10.9
APE1085
Pb Free Plating Product
3A Low Dropout Positive Adjustable or Fixed-Mode Regulator
L2
E
D
9.1
L
L3
1.3 e b b2
2.54
Land Pattern Recommendation (Unit: mm)
C
3 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
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 0.575 0.090 0.050 0.360 0.393 0.100 BSC. 0.600 0.100 0.051 0.060 0.380 0.405 0.625 0.110 0.115 0.070
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C2
A
15.7
Advanced Power Electronics Corp.
(2) TO252-3L
5.6 E b2 L2 5.6
APE1085
Pb Free Plating Product
3A Low Dropout Positive Adjustable or Fixed-Mode Regulator
11.0
2.25 2.0
7.2 1.2 H SEE NOTE2 C1 L SEATING PLANE
L1
D
b e1
e
Land Pattern Recommendation (Unit: mm)
A1
C
Notes: 1. 2.
JEDEC Outline: TO-252 AB Mils suggested for positive contact at mounting.
Symbol A A1 b b2 C C1 D E e e1 H L L1 L2
Dimensions In Millimeters Min. Nom. Max. 2.18 2.29 2.40 0.89 1.14 0.61 TYP. 5.20 5.35 5.50 0.45 0.52 0.58 0.45 0.52 0.58 5.40 5.57 6.20 6.35 6.58 6.80 2.28 BSC. 4.57 BSC. 9.00 9.70 10.40 0.51 0.64 0.83 1.02 0.88 1.27
Dimensions In Inches Min. Nom. Max. 0.086 0.090 0.094 0.035 0.045 0.024 TYP. 0.205 0.211 0.217 0.018 0.020 0.023 0.018 0.020 0.023 0.213 0.219 0.244 0.250 0.259 0.268 0.090 BSC. 0.180 BSC. 0.354 0.382 0.409 0.020 0.025 0.033 0.040 0.035 0.050
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A
Advanced Power Electronics Corp.
(3) TO220-3L
APE1085
Pb Free Plating Product
3A Low Dropout Positive Adjustable or Fixed-Mode Regulator
E
Q
P
A
F
H1
b1
L1
L
b
C
e e1
J1
Symbol
A b1 b C D E e e1 F H1 J1 L L1 oP 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
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
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SEATING PLANE
D

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