Advanced Power Electronics Corp. APE1085 Pb Free Plating Product 3A Low Dropout Positive Adjustable or Fixed-Mode Regulator General Description 1. Features * * * * * * * * 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 1.2V, 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 Low Dropout Regulator 1085 X - XX Package Vout H : TO 252-3L S : TO263-3L P : TO220-3L Blank : Adj 12 = 1.2V 15 = 1.5V 18 = 1.8V 25 = 2.5V 33 = 3.3V 50 = 5.0V Block Diagram Vin 3 2 Vout + + 1.25V (1.2V) 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. 200801073-1/7 Advanced Power Electronics Corp. APE1085 Pb Free Plating Product 3A Low Dropout Positive Adjustable or Fixed-Mode Regulator Connection Diagram TO263 TO252 FRONT VIEW FRONT VIEW Vin 3 Vout 2 2 Adj (GND) 1 3 Tab is Vout 1 Vin Vout Adj (GND) Tab is Vout TO220 FRONT VIEW 3 Vin 2 Vout 1 Adj (GND) Tab is Vout Pin Descriptions Name I/O Adj (GND) I 1 Vout O 2 Vin I 3 Pin No. 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. Advanced Power Electronics Corp. www.a-power.com.tw 2/7 Advanced Power Electronics Corp. APE1085 Pb Free Plating Product 3A Low Dropout Positive Adjustable or Fixed-Mode Regulator Absolute Maximum Ratings Symbol Parameter Rating Vin PD TST DC Supply Voltage Power Dissipation Storage Temperature TOP Operating Junction Temperature Range Electrical Characteristics Sym. VREF Parameter Reference Voltage APE1085-XXX APE1085-12 APE1085-15 APE1085-18 Line Regulation APE1085-25 APE1085-33 APE1085-50 APE1085-Adj APE1085-12 APE1085-15 Load APE1085-18 Regulation APE1085-25 Vo JA JC APE1085-33 APE1085-50 Dropout Voltage Current Limit Minimum Load Current Temperature Stability Thermal Resistance Junction-to-Ambient (No heat sink ;No air flow) Unit -0.3 to 12 V Internally Limited oC -65 to +150 oC 0 to +150 (Under Operating Conditions) Conditions (Notes) o Io=10mA, Tj=25 C, (Vin-Vout)=1.5V IO=10mA, VOUT+1.5V<VIN<12V, TJ =25oC IOUT = 10mA, TJ = 25oC, 3VVIN12V IOUT = 10mA, TJ = 25oC, 3VVIN12V IOUT = 10mA, TJ = 25oC, 3.3VVIN12V IOUT = 10mA, TJ = 25oC, 4VVIN12V IOUT = 10mA, TJ = 25oC, 4.8VVIN12V IOUT = 10mA, TJ = 25oC, 6.5VVIN12V VIN=3.3V, 0mA<Io<3A, TJ =25oC (Note 1,2) VIN=3V, 0mA<Io<3A, TJ =25oC (Note 1,2) VIN=3V, 0mA<Io<3A, TJ =25oC (Note 1,2) VIN=3.3V, 0mA<Io<3A TJ =25oC (Note 1,2) VIN=4V, 0mA<Io<3A TJ =25oC (Note 1,2) V IN = 5V, 0mA<Io<3A , TJ=25oC (Note 1,2) V IN = 8V, 0mA<Io<3A, TJ=25oC (Note 1,2) Io=3.0A (Vout = 1% Vout) Vin-Vout=5V Min. Typ. Max. Unit 1.225 1.250 0.2 1.275 0.5 V % 1.176 1.470 1.764 2.450 3.235 4.900 1.200 1.500 1.800 2.500 3.300 5.000 1.224 1.530 1.836 2.550 3.365 5.100 V V V V V V 1 % 10 12 mV 12 15 mV 15 18 mV 20 25 mV 26 40 1.3 33 50 1.4 mV mV V A 5 10 mA 5.1 Io=10mA 0.5 TO-252 TO-263 TO-220 98 83 83 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 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. Advanced Power Electronics Corp. www.a-power.com.tw 3/7 Advanced Power Electronics Corp. APE1085 Pb Free Plating Product 3A 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 Vin Vin Vout GND Tab is Vout 3.3V/5A 3.3V/3A C2 100uF Vout Adj 2.5V/5A 2.5V/3A R1 121 C2 100uF R2 121 Tab is Vout Note: VO = VREF (1 + R2 R1 ) Advanced Power Electronics Corp. www.a-power.com.tw 4/7 Advanced Power Electronics Corp. APE1085 Pb Free Plating Product 3A Low Dropout Positive Adjustable or Fixed-Mode Regulator Functional Description 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. 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. 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 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. Advanced Power Electronics Corp. www.a-power.com.tw 5/7 Advanced Power Electronics Corp. APE1085 Pb Free Plating Product 3A Low Dropout Positive Adjustable or Fixed-Mode Regulator Performance Characteristics 0.20 2. 0 Output Voltage Deviation (%) 1. 8 1. 6 Dropout Voltage (V) 1. 4 1. 2 0 I load=1.5A -0.20 Tj = 25 oC 1. 0 -0.40 0. 8 Tj = 125 oC 0. 6 -0.80 0. 4 0. 2 0 0 1 2 3 -1 5 4 Output Current (A) -25 Dropout Voltage vs Output Current 0 25 50 Temperature ( oC) 75 100 125 Load Regulation vs Temperature 2 1 0.8 1 0. 5 0 -0.5 -1 -1.5 -2 -50 -25 0 25 50 Temperature ( oC) 75 100 125 150 Output Voltage Deviation (%) Output Voltage Change (%) 1.5 0.6 0.4 0.2 0 2 4 7.5 Cin=1uF Cout=10uF Tantalum 6.5 5.5 40 20 0 -20 -40 0 20 40 60 80 100 120 140 160 180 200 TIME (us) Line Transient Response Load Current (A) Output Voltage Deviation (mV) Output Voltage Deviation (mV) Input Voltage (V) Percent Change in Output Voltage vs Temperature 6 8 10 Input Voltage (V) 12 Line Regulation 60 Cin=1uF Cout=10uF Tantalum Preload=100mA 40 20 0 -20 -40 6 4 2 0 0 10 20 30 40 50 TIME (us) 60 70 80 90 100 Load Transient Response Advanced Power Electronics Corp. www.a-power.com.tw 6/7 Advanced Power Electronics Corp. APE1085 Pb Free Plating Product 3A Low Dropout Positive Adjustable or Fixed-Mode Regulator Marking Information ( Top View ) Part Number Logo 1085 for ADJ 1085-VV : 12 for 1.2V 15 for 1.5V 18 for 1.8V 25 for 2.5V 33 for 3.3V 50 for 5V 1085-VV Y WW SSS Y: Year - " 1 : 2001 ~ WW : Xth week - 01 ~52 SSS : Sequence - 001 ~ (TO220-3L / TO263-3L / TO252-3L) Advanced Power Electronics Corp. www.a-power.com.tw 7/7 ADVANCED POWER ELECTRONICS CORP. Package Outline : TO-252 D D1 E2 MIN NOM MAX A2 1.80 2.30 2.80 A3 0.40 0.50 0.60 B1 0.40 0.70 1.00 D 6.00 6.50 7.00 D1 4.80 5.35 5.90 E3 3.50 4.00 4.50 E3 E1 B1 F1 e Millimeters SYMBOLS F 2.20 2.63 3.05 F1 0.5 0.85 1.20 E1 5.10 5.70 6.30 E2 0.50 1.10 1.80 e -- 2.30 -- C 0.35 0.50 0.65 F e 1.All Dimensions Are in Millimeters. 2.Dimension Does Not Include Mold Protrusions. R : 0.127~0.381 A2 A3 (0.1mm C Part Marking Information & Packing : TO-252 Part Number VOUT 1085-VV LOGO YWWSSS Date Code (YWWSS) YLast Digit Of The Year WWWeek SSSSequence ADVANCED POWER ELECTRONICS CORP. Package Outline : TO-220 E1 A E Millimeters SYMBOLS L2 L5 c1 D L4 b1 L3 MIN NOM MAX A 4.25 4.48 4.70 b b1 c c1 0.65 0.80 0.90 1.15 1.38 1.60 0.40 0.50 0.60 1.00 1.20 1.40 E 9.70 10.00 10.40 E1 --- --- 11.50 L1 L c b e ---- 2.54 ---- L 12.70 13.60 14.50 L1 2.60 2.80 3.00 L2 1.00 1.40 1.80 L3 2.6 3.10 3.6 L4 14.70 15.50 16 L5 6.30 6.50 6.70 3.50 3.60 3.70 D 8.40 8.90 9.40 1.All Dimensions Are in Millimeters. 2.Dimension Does Not Include Mold Protrusions. e Part Marking Information & Packing : TO-220 Part Number VOUT 1085-VV LOGO YWWSSS Date Code (YWWSSS) YLast Digit Of The Year WWWeek SSSSequence ADVANCED POWER ELECTRONICS CORP. Package Outline : TO-263 E SYMBOLS MIN NOM MAX A 4.25 4.75 5.20 A1 0.00 0.15 0.30 A2 2.20 2.45 2.70 b 0.70 0.90 1.10 b1 1.07 1.27 1.47 c 0.30 0.45 0.60 D c1 1.15 1.30 1.45 D 8.30 8.90 9.40 E 9.70 10.10 10.50 e 2.04 2.54 3.04 L2 ----- 1.50 ----- L3 4.50 4.90 5.30 L4 ----- 1.50 ---- b1 L2 L3 b e L4 Millimeters A A2 1.All Dimensions Are in Millimeters. 2.Dimension Does Not Include Mold Protrusions. c c1 A1 Part Marking Information & Packing : TO-263 Part Number VOUT XXXXXS 1085-VV YWWSSS LOGO Date Code (YWWSSS) YLast Digit Of The Year WWWeek SSSSequence