NOT RECOMMENDED FOR NEW DESIGN USE AZ1084C AP1084 5A LOW DROPOUT POSITIVE ADJUSTABLE OR FIXED-MODE REGULATOR Features General Description  1.4V Maximum Dropout at Full Load Current AP1084 is a low dropout positive adjustable or fixed-mode  Built-in Thermal Shutdown regulator with 5.0A output current capability. The product is  Output Current Limiting specifically designed to provide well-regulated supply for low  Adjustable Output Voltage or Fixed 1.5V, 1.8V, 2.5V, voltage IC applications such as high-speed bus termination and 3.3V, 5.0V low current 3.3V logic supply. AP1084 is also well suited for other  Fast Transient Response applications such as VGA cards. AP1084 is guaranteed to have  Good Noise Rejection 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  Lead Free Packages: TO252-3L, TO263-3L and TO220-3L 12V input supply.  TO252-3L, TO263-3L and TO220-3L: Available in “Green” Molding Compound (No Br, Sb)  Lead Free Finish/RoHS Compliant (Note 1) Typical Application Circuit 5.0V to 3.3V Fixed Mode Regulator Adjustable Regulator 5V 5V C1 C1 100uF 100uF Vin Vin Vout 3.3V/5A Vout 2.5V/5A R1 121Ω C2 C2 Adj GND 100uF 100uF R2 121Ω Tab is Vout Tab is Vout R Note: V  V  (1 2) O REF R 1 AP1084 Rev. 9 1 of 11 JANUARY 2010 DS31070 www.diodes.com © Diodes Incorporated

AP1084 5A LOW DROPOUT POSITIVE ADJUSTABLE OR FIXED-MODE REGULATOR Ordering Information AP1084 X XX X - X Package Vout Lead Free Packing D : TO252-3L Blank = Adj L : Lead Free U : Tube K : TO263-3L 15 = 1.5V G : Green 13 : Tape & Reel T : TO220-3L 18 = 1.8V 25 = 2.5V 33 = 3.3V 50 = 5.0V Tube 13” Tape and Reel Package Packaging Device Code (Note 2) Quantity Part Number Quantity Part Number Suffix Suffix AP1084DXXL-13 D TO252-3L NA NA 2500/Tape & Reel -13 AP1084DXXG-13 D TO252-3L NA NA 2500/Tape & Reel -13 AP1084KXXL-13 K TO263-3L NA NA 800/Tape & Reel -13 AP1084KXXG-13 K TO263-3L NA NA 800/Tape & Reel -13 AP1084TXXL-U T TO220-3L 50 -U NA NA AP1084TXXG-U T TO220-3L 50 -U NA NA Notes: 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 2 of 11 JANUARY 2010 DS31070 www.diodes.com © Diodes Incorporated

AP1084 5A LOW DROPOUT POSITIVE ADJUSTABLE OR FIXED-MODE REGULATOR Pin Assignment (1) TO252-3L (2) TO263-3L ( Top View ) ( Top View ) 3 V IN 3 V IN 2 V OUT 2 V OUT 1 Adj (GND) 1 Adj (GND) Tab is VOUT Tab is VOUT (3) TO220-3L ( Top View) 3 V IN 2 V OUT 1 Adj (GND) Tab is V OUT Pin Description Pin Name I/O Pin # Description Adjustable (Ground only for fixed mode) Adj (GND) I 1 A resistor divider from this pin to the V pin and ground sets the output voltage OUT (Ground only for Fixed-Mode). The output of the regulator. A minimum of 10uF (0.15Ω ≤ ESR ≤ 20Ω) capacitor must V O 2 OUT 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 V I 3 IN dropout voltage during the load transient response. This pin must always be 1.4V (1.3V) higher than V in order for the device to regulate properly. OUT AP1084 Rev. 9 3 of 11 JANUARY 2010 DS31070 www.diodes.com © Diodes Incorporated

AP1084 5A LOW DROPOUT POSITIVE ADJUSTABLE OR FIXED-MODE REGULATOR Block Diagram V 3 2 V in out + + + - 1.25V CURRENT LIMIT + Thermal Shutdown - 1 Adj Absolute Maximum Ratings Symbol Parameter Rating Unit V DC Supply Voltage -0.3 to 12 V IN TST Storage Temperature -65 to +150 oC TMJ Maximum Junction Temperature 150 oC Recommended Operating Conditions Symbol Parameter Min Max Unit TOP Operating Junction Temperature Range 0 125 oC AP1084 Rev. 9 4 of 11 JANUARY 2010 DS31070 www.diodes.com © Diodes Incorporated

AP1084 5A LOW DROPOUT POSITIVE ADJUSTABLE OR FIXED-MODE REGULATOR Electrical Characteristics (Under Operating Conditions) Symbol Parameter Conditions Min Typ. Max Unit Reference V Io = 10mA, T = 25oC, (V -V ) = 1.5V 1.225 1.250 1.275 V REF Voltage A IN OUT AP1084-XXX I = 10mA, V +1.5V<V <12V, T = 25oC 0.2 % O OUT IN A AP1084-1.5 I = 10mA, T = 25oC, 3V≦V ≦12V 1.470 1.500 1.530 V OUT A IN Line AP1084-1.8 IOUT = 10mA, TA = 25oC, 3.3V≦VIN≦12V 1.764 1.800 1.836 V Regulation AP1084-2.5 I = 10mA, T = 25oC, 4V≦V ≦12V 2.450 2.500 2.550 V OUT A IN AP1084-3.3 I = 10mA, T = 25oC, 4.8V≦V ≦12V 3.235 3.300 3.365 V OUT A IN AP1084-5.0 I = 10mA, T = 25oC, 6.5V≦V ≦12V 4.900 5.000 5.100 V OUT A IN AP1084-Adj V = 3.3V, 0mA<Io<5A, T = 25oC 1 % IN A V = 3V, 0mA<Io<5A, T = 25oC AP1084-1.5 IN A 12 15 mV (Note 3, 4) V = 3.3V, 0mA<Io<5A AP1084-1.8 IN 15 18 mV Load T = 25oC (Note 3, 4) A Regulation V = 4V, 0mA < Io < 5A AP1084-2.5 IN 20 25 mV T = 25oC (Note 3, 4) A AP1084-3.3 V = 5V, 0mA < Io < 5A, T = 25oC (Note 3, 4) 26 33 mV IN A V = 8V, 0mA < Io < 5A, T = 25oC AP1084-5.0 IN A 40 50 mV (Note 3, 4) Dropout Vo I = 5.0A (V = 1% V ) 1.3 1.4 V Voltage o OUT OUT Current Limit V -V = 5V 5.1 A IN OUT Minimum Load 5 10 mA Current Temperature I = 10mA 0.5 % Stability o Thermal T Shutdown 150 OC SD Temperature Thermal TO220-3L 78 Resistance θ Junction-to- TO252-3L 73 OC/W JA Ambient TO263-3L 60 (Note 5) Thermal TO220-3L:Control Circuitry/Power Transistor 3.5 θ Resistance TO252-3L:Control Circuitry/Power Transistor 12 OC/W JC Junction-to- TO263-3L:Control Circuitry/Power Transistor 3.5 Case (Note 5) 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 θJC is located on the thermal tab. AP1084 Rev. 9 5 of 11 JANUARY 2010 DS31070 www.diodes.com © 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 Vout Adj 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 121Ω 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=121Ω and R2=200Ω 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 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 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 6 of 11 JANUARY 2010 DS31070 www.diodes.com © Diodes Incorporated

AP1084 5A LOW DROPOUT POSITIVE ADJUSTABLE OR FIXED-MODE REGULATOR Typical Performance Characteristics 2. 0 0.20 1. 8 %) 1. 6 0 n ( I load=1.5A V)1. 4 atio e (1. 2 Tj = 25 oC evi-0.20 g D olta1. 0 ge V a ut 0. 8 olt-0.40 opo0. 6 Tj = 125 oC ut V Dr0. 4 Outp-0.80 0. 2 0 - 1 0 1 2 3 4 5 -40 0 25 50 75 100 125 Output Current (A) Temperature (oC) Dropout Voltage vs Output Current Load Regulation vs Temperature 2 1 1.5 0.8 1 %) hange (00. 5 ation (%)0.6 e C evi oltag-0.5 ge D0.4 utput V--1 1.5 ut Volta0.2 O p ut - 2 O 0 -40 -25 0 25 50 75 100 125 150 2 4 6 8 10 12 Temperature (oC) Input Voltage (V) Percent Change in Output Voltage vs Temperature Line Regulation age (V) 67..55 CCoinu=t1=u1F0uF Tantalum n (mV)4600 CCProineu=lot1=au1dF0=u1F0 0 TmaAntalum Volt atio20 ut 5.5 evi p D 0 In 40 ge mV) Volta-20 n ( 20 ut -40 o p ati ut evi 0 O 6 age D -20 nt (A) 4 Volt urre 2 utput -400 20 40 60 80 100 120 140 160 180 200 oad C 00 10 20 30 40 50 60 70 80 90 100 O TIME (us) L TIME (us) Line Transient Response Load Transient Response AP1084 Rev. 9 7 of 11 JANUARY 2010 DS31070 www.diodes.com © Diodes Incorporated

AP1084 5A LOW DROPOUT POSITIVE ADJUSTABLE OR FIXED-MODE REGULATOR Marking Information (1) TO252-3L ( Top view ) Logo L : Lead Free G : Green Part Number 84-VV YY : Year : 01~09 1084 for ADJ YY WW X X 84-VV : 15 for 1.5V WW : Week : 01~52, 52 represents 52 and 53 week 18 for 1.8V X : Internal Code 25 for 2.5V 33 for 3.3V 50 for 5.0V (2) TO263-3L ( Top view ) Logo L : Lead Free Part Number 1084-VV G : Green YY : Year : 01~09 VV: 15 for 1.5V YYWWXX WW : Week : 01~52, 52 represents 18 for 1.8V 52 and 53 week 25 for 2.5V X : Internal code 33 for 3.3V 50 for 5.0V Blank for ADJ (3) TO220-3L ( Top view ) Logo L : Lead Free Part Number 1084-VV G : Green VV: 15 for 1.5V YYWWXX YY : Year : 01~09 18 for 1.8V WW : Week : 01~52, 52 represents 52 and 53 week 25 for 2.5V X : Internal code 33 for 3.3V 50 for 5.0V Blank for ADJ AP1084 Rev. 9 8 of 11 JANUARY 2010 DS31070 www.diodes.com © Diodes Incorporated

AP1084 5A LOW DROPOUT POSITIVE ADJUSTABLE OR FIXED-MODE REGULATOR Package Information (All Dimensions in mm) (1) Package type: TO252-3L 7 2 5.6 1. 6.354/6.80 Typ 6.58 8/ 8 5.20/5.50 Typ 5.35 0. 6 5. 07 0 0/6.2p 5.5 11. 7.2 4y 5.T 2.25 0 2. 1.2 0.61 Typ 2.28 Land Pattern Recommendation (Unit: mm) 0.64/1.02 BSC. 2.18/2.40 4.57 BSC. Typ 0.83 01..8194/ 9.00/10.40 Typ 9.70 Typ 2.29 2 E T 0.45/0.58 0.51 O SEATING Typ 0.52 E N PLANE 0T.y4p5 /00..5528 E S (2) Package type: TO263-3L 0 9.65/10.29 Typ 9.97 2.92Typ 1.3 10.9 5 4 yp 9.1 p 15.2 9.1 T y 65 8 T 5.7 8.65/9. 61/15.8 1 4. 1 3 2.54 1.27/1.78Typ 1.52 1.3 2.54 BSC. 0.51/0.99 Typ 0.75 Land Pattern Recommendation (Unit: mm) 1.14/1.40 Typ1.27 0.38 Typ 4.06/4.83Typ 4.45 2.28/2.80 Typ 2.54 1.14/1.40Typ 1.27 AP1084 Rev. 9 9 of 11 JANUARY 2010 DS31070 www.diodes.com © Diodes Incorporated

AP1084 5A LOW DROPOUT POSITIVE ADJUSTABLE OR FIXED-MODE REGULATOR Package Information (Continued) (3) Package type: TO220-3L  3.55/4.85 2.54/3.43 9.70/10.70 3.53/4.09 Typ 4.20 0.51/1.40 Typ 2.98 Typ 10.20 Typ 3.81 Typ 0.95 E 5.84/6.86 N A 505 Typ 6.35 PL 4.20/16.Typ 15.3 EATING 1 S 3.66/6.35 Typ 5.00 1.14/1.78 722 Typ 1.46 14.3.7 72/p 1 2.Ty 1 0.31/1.14 0.51/1.14 Typ 0.72 Typ 0.83 2.99/2.79 2.03/2.92 4.83/5.33 Typ 2.54 Typ 2.48 Typ 5.08 AP1084 Rev. 9 10 of 11 JANUARY 2010 DS31070 www.diodes.com © 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 © 2009, Diodes Incorporated www.diodes.com AP1084 Rev. 9 11 of 11 JANUARY 2010 DS31070 www.diodes.com © Diodes Incorporated