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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 Packages: TO252-3L, TO263-3L and TO220-3L TO252-3L, TO263-3L and TO220-3L: Available in "Green" Molding Compound (No Br, Sb) Lead Free Finish/RoHS Compliant (Note 1) 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. Typical Application Circuit 5.0V to 3.3V Fixed Mode Regulator 5V C1 100uF Vin Vout GND Tab is Vout 3.3V/5A C2 100uF Vin Vout Adj Tab is Vout R1 121 R2 121 C2 100uF 2.5V/5A 5V Adjustable Regulator C1 100uF Note: VO = VREF (1 + R2 R1 ) AP1084 Rev. 9 DS31070 1 of 11 www.diodes.com JANUARY 2010 (c) Diodes Incorporated AP1084 5A LOW DROPOUT POSITIVE ADJUSTABLE OR FIXED-MODE REGULATOR Ordering Information AP1084 X XX X - X Package D : TO252-3L K : TO263-3L T : TO220-3L Vout Blank = Adj 15 = 1.5V 18 = 1.8V 25 = 2.5V 33 = 3.3V 50 = 5.0V Packaging (Note 2) TO252-3L TO252-3L TO263-3L TO263-3L TO220-3L TO220-3L Lead Free L : Lead Free G : Green Packing U : Tube 13 : Tape & Reel Device AP1084DXXL-13 AP1084DXXG-13 AP1084KXXL-13 AP1084KXXG-13 AP1084TXXL-U AP1084TXXG-U Notes: Package Code D D K K T T Tube Part Number Quantity Suffix NA NA NA NA NA NA NA NA 50 -U 50 -U 13" Tape and Reel Part Number Quantity Suffix 2500/Tape & Reel -13 2500/Tape & Reel -13 800/Tape & Reel -13 800/Tape & Reel -13 NA NA NA NA 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at http://www.diodes.com/products/lead_free.html. 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. AP1084 Rev. 9 DS31070 2 of 11 www.diodes.com JANUARY 2010 (c) Diodes Incorporated AP1084 5A LOW DROPOUT POSITIVE ADJUSTABLE OR FIXED-MODE REGULATOR Pin Assignment (1) TO252-3L (2) TO263-3L ( Top View ) 3 2 1 Tab is VOUT (3) TO220-3L ( Top View ) VIN 3 VIN VOUT Adj (GND) VOUT Adj (GND) 2 1 Tab is VOUT ( Top View) 3 2 1 Tab is VOUT VIN VOUT Adj (GND) Pin Description Pin Name I/O Adj (GND) I Pin # 1 Description 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 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. VOUT O 2 VIN I 3 AP1084 Rev. 9 DS31070 3 of 11 www.diodes.com JANUARY 2010 (c) Diodes Incorporated AP1084 5A LOW DROPOUT POSITIVE ADJUSTABLE OR FIXED-MODE REGULATOR Block Diagram Vin 3 2 Vout + + CURRENT LIMIT + Thermal Shutdown 1 Adj 1.25V + Absolute Maximum Ratings Symbol VIN TST TMJ Parameter DC Supply Voltage Storage Temperature Maximum Junction Temperature Rating -0.3 to 12 -65 to +150 150 Unit V oC oC Recommended Operating Conditions Symbol TOP Parameter Operating Junction Temperature Range Min 0 Max 125 Unit oC AP1084 Rev. 9 DS31070 4 of 11 www.diodes.com JANUARY 2010 (c) Diodes Incorporated AP1084 5A LOW DROPOUT POSITIVE ADJUSTABLE OR FIXED-MODE REGULATOR Electrical Characteristics Symbol Parameter (Under Operating Conditions) Conditions Io = 10mA, TA = 25 C, (VIN-VOUT) = 1.5V IO = 10mA, VOUT+1.5V 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 12 15 20 26 40 1.3 Max 1.275 0.2 1.530 1.836 2.550 3.365 5.100 1 15 18 25 33 50 1.4 Unit V % V V V V V % mV mV mV mV mV V A Reference VREF Voltage AP1084-XXX AP1084-1.5 AP1084-1.8 Line Regulation AP1084-2.5 AP1084-3.3 AP1084-5.0 AP1084-Adj AP1084-1.5 Load Regulation AP1084-1.8 AP1084-2.5 AP1084-3.3 AP1084-5.0 Vo TSD JA JC Dropout Io = 5.0A (VOUT = 1% VOUT) Voltage Current Limit VIN-VOUT = 5V Minimum Load Current Temperature Io = 10mA Stability Thermal Shutdown Temperature Thermal TO220-3L Resistance TO252-3L Junction-toAmbient TO263-3L (Note 5) TO220-3L:Control Circuitry/Power Transistor Thermal Resistance TO252-3L:Control Circuitry/Power Transistor Junction-toCase (Note 5) TO263-3L:Control Circuitry/Power Transistor 5.1 5 0.5 150 78 73 60 3.5 12 3.5 O O 10 mA % O C C/W C/W Notes: 3. 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. 4. 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. 5. Test conditions for TO220-3L, TO252-3L and TO263-3L: Devices mounted on FR-4 substrate, single sided PC board, 2oz copper, with minimum recommended pay layout, no air flow. The case point of JC is located on the thermal tab. AP1084 Rev. 9 DS31070 5 of 11 www.diodes.com JANUARY 2010 (c) 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 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. 9 DS31070 6 of 11 www.diodes.com JANUARY 2010 (c) Diodes Incorporated AP1084 5A LOW DROPOUT POSITIVE ADJUSTABLE OR FIXED-MODE REGULATOR Typical 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 0.8 Output Current (A) 2 3 4 5 -1 -40 0 Load Regulation vs Temperature Temperature (oC) 25 50 75 100 125 Output Voltage Change (%) 1 0. 5 0 -0.5 -1 -1.5 -2 -40 -25 0 25 50 75 100 125 150 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 Line Transient Response TIME (us) 80 100 120 140 160 180 200 30 Load Transient Response TIME (us) 40 50 60 70 80 90 100 AP1084 Rev. 9 DS31070 7 of 11 www.diodes.com JANUARY 2010 (c) Diodes Incorporated 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 5.0V 84-VV YY WW X X L : Lead Free G : Green YY : Year : 01~09 WW : Week : 01~52, 52 represents 52 and 53 week X : Internal Code (2) 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 5.0V Blank for ADJ L : Lead Free G : Green YY : Year : 01~09 WW : Week : 01~52, 52 represents X : Internal code 1084-VV YY WW X X 52 and 53 week (3) TO220-3L ( Top view ) Logo Part Number VV: 15 for 1.5V 18 for 1.8V 25 for 2.5V 33 for 3.3V 50 for 5.0V Blank for ADJ 1084-VV YY WW X X L : Lead Free G : Green YY : Year : 01~09 WW : Week : 01~52, 52 represents X : Internal code 52 and 53 week AP1084 Rev. 9 DS31070 8 of 11 www.diodes.com JANUARY 2010 (c) Diodes Incorporated AP1084 5A LOW DROPOUT POSITIVE ADJUSTABLE OR FIXED-MODE REGULATOR Package Information (1) Package type: TO252-3L (All Dimensions in mm) 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 10.9 1.3 2.54 3 1.14/1.40 Typ 1.27 4.06/4.83 Typ 4.45 15.7 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 (2) Package type: TO263-3L 2.92 Typ 1.30 14.61/15.88 Typ 15.24 8.65/9.65 Typ 9.15 9.65/10.29 Typ 9.97 2.54 BSC. 1.27/ 1.78 Typ 1.52 0.51/0.99 Typ 0.75 1.1 4/1.4 0 T yp1.27 Land P attern R ecom m endation (U nit: m m ) 0.38 Typ 2 .28/2.8 0 T yp 2 .5 4 AP1084 Rev. 9 DS31070 9 of 11 www.diodes.com 9.1 JANUARY 2010 (c) Diodes Incorporated AP1084 5A LOW DROPOUT POSITIVE ADJUSTABLE OR FIXED-MODE REGULATOR Package Information (3) Package type: 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 AP1084 Rev. 9 DS31070 10 of 11 www.diodes.com JANUARY 2010 (c) Diodes Incorporated AP1084 5A LOW DROPOUT POSITIVE ADJUSTABLE OR FIXED-MODE REGULATOR IMPORTANT NOTICE DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDING TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability arising out of the application or use of this document or any product described herein; neither does Diodes Incorporated convey any license under its patent or trademark rights, nor the rights of others. Any Customer or user of this document or products described herein 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 Diodes Incorporated website, harmless against all damages. Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel. Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall indemnify and hold Diodes Incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized application. Products described herein may be covered by one or more United States, international or foreign patents pending. Product names and markings noted herein may also be covered by one or more United States, international or foreign trademarks. LIFE SUPPORT Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express written approval of the Chief Executive Officer of Diodes Incorporated. As used herein: A. Life support devices or systems are devices or systems which: 1. are intended to implant into the body, or 2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in significant injury to the user. B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or to affect its safety or effectiveness. Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems. Copyright (c) 2009, Diodes Incorporated www.diodes.com AP1084 Rev. 9 DS31070 11 of 11 www.diodes.com JANUARY 2010 (c) Diodes Incorporated |
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