CYStech Electronics Corp. 5A Low Dropout Positive Voltage Regulator Spec. No. : C512J3 Issued Date : 2007.07.04 Revised Date : Page No. : 1/6 TO-252 PL1084-XXXJ3 Features Maximum Dropout Voltage 1.5V at 5A Output Current. Fast Transient Response. Extremely Tight Line and Load Regulation. Current Limiting and Thermal Protection. Adjustable Output Voltage or Fixed 1.5V, 1.8V,2.5V,3.3V,5.0V. Standard 3-Pin Power Packages. Adj/GND Vout Vin Description The PL1084-XXXJ3 is a low dropout three terminal regulator with 5A output current capability. The output voltage is adjustable with the use of a resistor divider or fixed 1.5V, 1.8V, 2.5V, 3.3V, and 5.0V. Dropout voltage is guaranteed to be at maximum of 1.5V with the maximum output current. Its low dropout voltage and fast transient response make it ideal for low voltage microprocessor applications. Current limit and thermal protection provide protection against any overload condition that would create excessive junction temperatures. Applications Mother Board I/O Power Supplies. Microprocessor Power Supplies. High Current Regulator. Post Regulator for Switching Supply. Typical Application Circuit Vin=5V Vout=3.3V 3 PL1084-Adj 2 VREF 1 ADJ C1 10μF R1 125Ω 1% C2 10μF R2 205Ω 1% Adjustable Voltage Regulator Vin=5V 3 2 Vout=3.3V PL1084-3.3 C1 10μF C2 10μF 1 Fixed Voltage Regulator PL1084-XXXJ3 CYStek Product Specification CYStech Electronics Corp. Spec. No. : C512J3 Issued Date : 2007.07.04 Revised Date : Page No. : 2/6 Ordering Information Device PL1084-AdjJ3 PL1084-1.5J3 PL1084-1.8J3 PL1084-2.5J3 PL1084-3.3J3 PL1084-5.0J3 Output Voltage Adjustable 1.5V 1.8V 2.5V 3.3V 5.0V Absolute Maximum Ratings Symbol Vin PD TSTG TOPR Parameter DC supply voltage Power Dissipation Storage Temperature Operating Junction Temperature Ratings Unit -0.3 to +12 V Internally Limited -65 ~ +150 ℃ 0 ~ +150 ℃ Electrical Characteristics (Io=10mA,Tj=25℃, unless otherwise noted) Symbol VREF Vo ΔVo ΔVo VD Is IAdj IQ Ts IL θJA θJC PL1084-XXXJ3 Parameter Conditions Reference Voltage Output Voltage Vin-Vout=1.5V PL1084-1.5 3V≤Vin≤12V PL1084-1.8 3.3V≤Vin≤12V PL1084-2.5 4V≤Vin≤12V PL1084-3.3 4.8V≤Vin≤12V PL1084-5.0 6.5V≤Vin≤12V Line Regulation Fixed: Vout+1.5V≤Vin≤12V Adj Vin=3.3V, 0≤Io≤5A PL1084-1.5 Vin=3.0V, 0≤Io≤5A PL1084-1.8 Vin=3.3V, 0≤Io≤5A Load Regulation(Note 1, 2) PL1084-2.5 Vin=4.0V, 0≤Io≤5A PL1084-3.3 Vin=5.0V, 0≤Io≤5A PL1084-5.0 Vin=8.0V, 0≤Io≤5A Dropout Voltage Current Limit Adjust Pin Current Quiescent Current Temperature Stability Minimum Load Current Thermal Resistance, Junction to Ambient(No Heat Sink; No air flow) Thermal Resistance, Junction to Case Io=5A (ΔVout=1%Vout) Vin-Vout=5V Vin=12V, Io=10mA Vin=12V, Io=0mA(fixed model) Io=10mA, 0°C≤Tj≤125°C Vin=5V(adjustable model) Min Typ Max Units 1.225 1.470 1.764 2.450 3.235 4.900 5.1 - 1.250 1.500 1.800 2.500 3.300 5.000 12 15 20 26 40 1.4 55 0.5 5 1.275 1.530 1.836 2.550 3.365 5.100 0.2 1 15 18 25 33 50 1.5 100 12 10 V V A μA mA % mA - 98 - ℃/W - 15 - ℃/W V % % mV CYStek Product Specification CYStech Electronics Corp. Spec. No. : C512J3 Issued Date : 2007.07.04 Revised Date : Page No. : 3/6 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. 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 over the full input/output range. Block Diagram Functional Description Introduction The PL1084 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 2.5V. The PL1084 only needs 1.5V 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 5A load step. The PL1084 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 PL1084 can be programmed to any voltages in the range of 1.25V to 5V with the addition of R1 and R2 external resistors according to the following formula: Vout=Vref(1+R2/R1)+Iadj*R2, where Vref=1.25V typically, Iadj=55μA typically The PL1084 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 requirement of the PL1084. 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 55μA, 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. PL1084-XXXJ3 CYStek Product Specification CYStech Electronics Corp. Spec. No. : C512J3 Issued Date : 2007.07.04 Revised Date : Page No. : 4/6 Load Regulation Since the PL1084 is only a 3 terminal device, it is not possible to provide true remote sensing of 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 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 represent 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 PL1084 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 10μF aluminum electrolytic capacitor insures both stability and good transient response. Thermal Design The PL1084 incorporates an internal 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 150℃, 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 excess trace inductance. PL1084-XXXJ3 CYStek Product Specification CYStech Electronics Corp. Spec. No. : C512J3 Issued Date : 2007.07.04 Revised Date : Page No. : 5/6 Characteristic Curves PL1084-XXXJ3 CYStek Product Specification CYStech Electronics Corp. Spec. No. : C512J3 Issued Date : 2007.07.04 Revised Date : Page No. : 6/6 TO-252 Dimension C A Marking: D B Device Name Date Code G F L 1084□□□ □□□□ 1.5V→ -15 1.8V→ -18 2.5V→ -25 3.3V→ -33 5.0V→ -50 ADJ→ blank 3 H E 2 K I Style: Pin 1.Adj(GND) 2.Vout(TAB) 3.Vin 1 J 3-Lead TO-252 Plastic Surface Mount Package CYStek Package Code: J3 *: Typical Inches Min. Max. 0.0177 0.0217 0.0650 0.0768 0.0354 0.0591 0.0177 0.0236 0.2520 0.2677 0.2125 0.2283 DIM A B C D E F Millimeters Min. Max. 0.45 0.55 1.65 1.95 0.90 1.50 0.45 0.60 6.40 6.80 5.40 5.80 DIM G H I J K L Inches Min. Max. 0.0866 0.1102 *0.0906 0.0354 0.0315 0.2047 0.2165 0.0551 0.0630 Millimeters Min. Max. 2.20 2.80 *2.30 0.90 0.80 5.20 5.50 1.40 1.60 Notes: 1.Controlling dimension: millimeters. 2.Maximum lead thickness includes lead finish thickness, and minimum lead thickness is the minimum thickness of base material. 3.If there is any question with packing specification or packing method, please contact your local CYStek sales office. Material: • Lead: 42 Alloy; solder plating • Mold Compound: Epoxy resin family, flammability solid burning class: UL94V-0 Important Notice: • All rights are reserved. Reproduction in whole or in part is prohibited without the prior written approval of CYStek. • CYStek reserves the right to make changes to its products without notice. • CYStek semiconductor products are not warranted to be suitable for use in Life-Support Applications, or systems. • CYStek assumes no liability for any consequence of customer product design, infringement of patents, or application assistance. PL1084-XXXJ3 CYStek Product Specification