AP1084 5A LOW DROPOUT POSITIVE ADJUSTABLE OR FIXED-MODE REGULATOR General Description Features • • • • • • • • • 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. 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 Package: TO252-3L, TO263-3L, and TO220-3L TO252-3L: Available in “Green” Molding Compound (No Br, Sb) (Note 1) Lead Free Finish/RoHS Compliant for Lead Free products (Note 2) Ordering Information AP1084 X Note: Package Vout D : TO252-3L K : TO263-3L T : TO220-3L Blank : Adj 15 = 1.5V 18 = 1.8V 25 = 2.5V 33 = 3.3V 50 = 5.0V X X Lead Free Packing L : Lead Free G : Green (Note 1) -U : Tube -13 : Taping 1. Green is only available for TO252-3L. 2. RoHS revision 13.2.2003. Glass and High Temperature Solder Exemptions Applied, see EU Directive Annex Notes 5 and 7. Device Lead-free Lead-free Note: XX AP1084D AP1084K AP1084T Tube/Bulk Package Packaging Part Number Code (Note 3) Quantity Suffix D K T TO252-3L TO263-3L TO220-3L 80 50 50 -U -U -U 13” Tape and Reel Part Number Quantity Suffix 2500/Tape & Reel 800/Tape & Reel NA -13 -13 NA 3. 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. 1 1 of 10 www.diodes.com FEBRUARY 2007 © Diodes Incorporated AP1084 5A LOW DROPOUT POSITIVE ADJUSTABLE OR FIXED-MODE REGULATOR Block Diagram Vin 3 2 Vout 1 Adj + + - 1.25V + CURRENT LIMIT + - Thermal Shutdown Pin Assignment TO263-3L TO252-3L FRONT VIEW FRONT VIEW 2 1 Vin 3 Vin 3 2 Vout Adj ( GND) Tab is Vout 1 Vout Adj ( GND) Tab is Vout TO220-3L FRONT VIEW 3 Vin 2 Vout 1 Adj ( GND) Tab is Vout AP1084 Rev. 1 2 of 10 www.diodes.com FEBRUARY 2007 © Diodes Incorporated AP1084 5A LOW DROPOUT POSITIVE ADJUSTABLE OR FIXED-MODE REGULATOR Pin Description Function Name I/O TO263/ 252/220 Adj (GND) I 1 Vout O 2 Vin I 3 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 (0.15Ω ≤ ESR ≤ 20Ω) capacitor must be connected from this pin to ground to insure stability. The input pin of regulator. Typically a large storage capacitor (0.15Ω ≤ ESR ≤ 20Ω) 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. Absolute Maximum Ratings Symbol Parameter Vin TST DC Supply Voltage Storage Temperature TOP Operating Junction Temperature Range TM Maximum Junction Temperature AP1084 Rev. 1 3 of 10 www.diodes.com Rating Unit -0.3 to 12 -65 to +150 0 to +125 V oC oC 150 oC FEBRUARY 2007 © Diodes Incorporated AP1084 5A LOW DROPOUT POSITIVE ADJUSTABLE OR FIXED-MODE REGULATOR Electrical Characteristics Sym. Parameter (Under Operating Conditions) Conditions o VREF Reference Voltage Io = 10mA, TA = 25 C, (Vin-Vout) = 1.5V AP1084-XXX IO = 10mA, VOUT+1.5V<VIN<12V, TA = 25oC IOUT = 10mA, TA = 25oC, 3V≦VIN≦12V AP1084-1.5 Line AP1084-1.8 IOUT = 10mA, TA = 25oC, 3.3V≦VIN≦12V Regula IOUT = 10mA, TA = 25oC, 4V≦VIN≦12V AP1084-2.5 tion IOUT = 10mA, TA = 25oC, 4.8V≦VIN≦12V AP1084-3.3 IOUT = 10mA, TA = 25oC, 6.5V≦VIN≦12V AP1084-5.0 VIN = 3.3V, 0mA<Io<5A, TA = 25oC AP1084-Adj C VIN = 3V, 0mA<Io<5A, TA = 25oC AP1084-1.5 (Note 4, 5) VIN = 3.3V, 0mA<Io<5A Load AP1084-1.8 o TA = 25 C (Note 4, 5) Regula VIN = 4V, 0mA < Io < 5A tion AP1084-2.5 o TA = 25 C (Note 4, 5) VIN = 5V, 0mA < Io < 5A, TA = 25oC AP1084-3.3 (Note 4, 5) VIN = 8V, 0mA < Io < 5A, TA = 25oC AP1084-5.0 (Note 4, 5) ∆Vo Dropout Voltage Io = 5.0A (∆Vout = 1% Vout) Current Limit Vin-Vout = 5V Minimum Load Current Temperature Io = 10mA Stability Thermal Resistance TO252-3L Junction-to-Ambient TO263-3L θJA (No heat sink; No TO220-3L air flow) TO252-3L: Control Circuitry/Power Transistor Thermal Resistance θJC TO263-3L: Control Circuitry/Power Transistor Junction-to-Case TO220-3L: Control Circuitry/Power Transistor Note: Min. Typ. Max. Unit 1.225 1.250 1.470 1.764 2.450 3.235 4.900 1.500 1.800 2.500 3.300 5.000 1.275 0.2 1.530 1.836 2.550 3.365 5.100 V % V V V V V 1 % 12 15 mV 15 18 mV 20 25 mV 26 33 mV 40 50 mV 1.3 1.4 V A 5 10 mA 5.1 0.5 98 95 83 10 19 13 % O C/W O C/W 4. 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. 5. 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. AP1084 Rev. 1 4 of 10 www.diodes.com FEBRUARY 2007 © Diodes Incorporated AP1084 5A 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 2.5V/5A Vout 3.3V/5A C2 100uF Adj R1 121Ω R2 121Ω Tab is Vout Note: VO = VREF∗ (1 + AP1084 Rev. 1 C2 100uF 5 of 10 www.diodes.com R2 R1 ) FEBRUARY 2007 © 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 Iadj = 55uA R1 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 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. 1 6 of 10 www.diodes.com FEBRUARY 2007 © Diodes Incorporated AP1084 5A 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 Output Current (A) -1 5 4 -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) Load Current (A) Output Voltage Deviation (mV) Output Voltage Deviation (mV) Input Voltage (V) Percent Change in Output Voltage vs Temperature 8 10 12 Line Regulation 60 Cin=1uF Cout=10uF Tantalum Preload=100mA 40 20 0 -20 -40 6 4 2 0 Line Transient Response AP1084 Rev. 1 6 Input Voltage (V) 0 10 20 30 40 50 TIME (us) 60 70 80 90 100 Load Transient Response 7 of 10 www.diodes.com FEBRUARY 2007 © Diodes Incorporated AP1084 5A LOW DROPOUT POSITIVE ADJUSTABLE OR FIXED-MODE REGULATOR Marking Information (1) TO252-3L (Top view) Logo 84-VV YY WW X X Internal Code Xth Week: 01~52 Year: "01" = 2001 "02" = 2002 ~ 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 5.5V L : Lead Free G : Green (2) TO220-3L / 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 5V Blank for ADJ AP1084 Rev. 1 1084-VV YY WW X X 8 of 10 www.diodes.com L : Lead Free Internal code Xth week: 01~52 Year: "01" = 2001 "02" = 2002 FEBRUARY 2007 © Diodes Incorporated AP1084 5A LOW DROPOUT POSITIVE ADJUSTABLE OR FIXED-MODE REGULATOR Package Information (unit: mm) 2.92 Typ 1.30 (1) TO263-3L 2.5 4 BSC. 1.27/ 1.78 Typ 1.52 3 15.7 9.1 8.65/9.65 Typ 9.15 10.9 14.61/15.88 Typ 15.24 9.65/10.29 Typ 9 .9 7 2.54 1.3 0 .51/0.99 Typ 0 .75 Land P attern R ecom m endation (U nit: m m ) 0.38 Typ 4.06/4.83 Typ 4.45 1.14/1.40 T yp1.27 1.14/1.40 Typ 1.27 2.28/2.80 Typ 2 .54 6.354/6.80 Typ 6.58 5.6 7.2 11.0 2.25 2.0 5.40/6.20 Typ 5.57 5.6 5.20/5.50 Typ 5.35 0.88/1.27 (2) TO252-3L 1.2 2.28 BSC. 4.57 BSC. 0.64/1.02 Typ 0.83 0.45/0.58 Typ 0.52 AP1084 Rev. 1 Land Pattern Recommendation (Unit: mm) 0.89/ 1.14 9.00/10.40 Typ 9.70 0.51 9 of 10 www.diodes.com SEE NOTE2 0.61 Typ SEATING PLANE 2.18/2.40 Typ 2.29 0.45/0.58 Typ 0.52 FEBRUARY 2007 © Diodes Incorporated AP1084 5A LOW DROPOUT POSITIVE ADJUSTABLE OR FIXED-MODE REGULATOR Package Information (Continued) (3) TO220-3L ∅ 3.53/4.09 3.55/4.85 Typ 4.20 Typ 3.81 5.84/6.86 Typ 6.35 4.83/5.33 Typ 5.08 12.72/14.72 Typ 13.72 3.66/6.35 Typ 5.00 1.14/1.78 Typ 1.46 0.51/1.40 Typ 0.95 SEATING PLANE 9.70/10.70 Typ 10.20 14.20/16.50 Typ 15.35 2.54/3.43 Typ 2.98 0.31/1.14 0.51/1.14 Typ 0.72 Typ 0.83 2.99/2.79 Typ 2.54 2.03/2.92 Typ 2.48 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. AP1084 Rev. 1 10 of 10 www.diodes.com FEBRUARY 2007 © Diodes Incorporated