XRP6275EVB

XRP6274/XRP6275 2A and 3A Ultra Low Dropout Voltage Regulators February 2014 Rev. 1.0.1 GENERAL DESCRIPTION EVALUATION BOARD MANUAL The XRP6274 and XRP6275 are ultra-low dropout voltage regulators capable of delivering 2Amp and 3Amp output currents respectively. They are unique in the industry in being able to operate from a single supply rail of 1.045V to 2.625V without the need for a noise generating charge pump. With their ultra-low dropout voltage of 140mV at full load guaranteed over temperature, the XRP6274 and XRP6275 achieve conversions previously unavailable. The output voltage can be set as low as 0.6V with ±0.5% accuracy making the XRP6274 and XRP6275 perfectly suited for powering low voltage devices such as FPGAs, DSPs, ASICs, and other SOCs. FEATURES • 3A Output Current XRP6275 • 2A Output Current XRP6274 • 1.045V to 2.625V Single Input Voltage An enable function, soft start and Power Good flag complete the feature set. Built-in current limit, reverse bias and thermal protection ensures safe operation under abnormal operating conditions. − Adjustable Output Voltage ≥0.6V − ±0.5% Output Voltage Accuracy (Room) − ±1.0% Output Voltage Accuracy (Temp) • Ultra Low Dropout Voltage XRP6275 − 138mV Max over temp @ 3A The XRP6274 and XRP6275 are offered in RoHS compliant, “green”/halogen free 10-pin 3x3mm DFN package. − 74mV Max over temp @ 2A • Ultra Low Dropout Voltage XRP6274 − 140mV Max over temp @ 2A • Enable & Soft Start • Current Limit, Thermal and reverse bias Protection • Power Good Flag EVALUATION BOARD SCHEMATICS PGOOD R4 55k EN R3 DNP VOUT R6 10k R5 100k 2 VIN 3 C6 DNP C5(OPTIONAL) 330uF C4 47uF C3(OPTIONAL) 0.1uF 4 C7 0.1uF 5 PGOOD GND EN VIN VIN GND ADJ VOUT VOUT GND R1 20.0 Ohm 10 9 8 7 6 C1(OPTIONAL) 0.1uF VIN SEN C2 47uF R2 30.1 Ohm GND 0 GND IN U1 XRP6274/5 EXP PAD 1 VOUT SEN Fig. 1: XRP6274/5 Evaluation Board Schematics Exar Corporation 48720 Kato Road, Fremont CA 94538, USA www.exar.com Tel. +1 510 668-7000 – Fax. +1 510 668-7001 XRP6274/XRP6275 2A and 3A Ultra Low Dropout Voltage Regulators PIN ASSIGNMENT PGOOD 1 10 AGND EN 2 9 ADJ VIN 3 8 VOUT VIN 4 7 VOUT PGND 5 6 PGND XRP7664/5 DFN-10 Thermal Pad Fig. 2: XRP6274/5 Pin Assignment PIN DESCRIPTION Name Pin Number Description Enable Input Pin. This is a high impedance MOS input. CMOS compatible; Logic high enables the device; logic low disables the device. Do not pull this pin higher than VIN+0.5V. EN 2 VIN 3, 4 PGOOD 1 VOUT 7, 8 ADJ 9 PGND 5, 6 Power Ground Ther. Pad --- Connect to PGND. AGND 10 Signal ground. Connect with a separate trace to the ground of the output being regulated. EN 2 VIN 3, 4 Power Input Pin. Must be closely decoupled to PGND pin with a 4.7μF or greater ceramic capacitor. Power Good open Drain Output. When used it should be pulled up to VIN with a resistor. Regulator Output pin. Adjustable Pin. Connect to a resistive voltage divider to set the output voltage of the device. Enable Input Pin. This is a high impedance MOS input. CMOS compatible; Logic high enables the device; logic low disables the device. Do not pull this pin higher than VIN+0.5V. Power Input Pin. Must be closely decoupled to PGND pin with a 4.7μF or greater ceramic capacitor. ORDERING INFORMATION Refer to XRP6274/5’s datasheet and/or www.exar.com for exact and up to date ordering information. © 2014 Exar Corporation 2/7 Rev. 1.0.1 XRP6274/XRP6275 2A and 3A Ultra Low Dropout Voltage Regulators USING THE EVALUATION BOARD PGOOD POWERING UP Power Good Flag can be monitored using the PGOOD test point. Use short/thick leads and connect the input power supply to ‘VIN/GND IN’ connectors. Use short/thick leads and connect the load to ‘VOUT/GND’ connectors. Apply VIN (1.2V2.625V). The XRP6274/5 will power up and regulate the output to 1V. MEASURING DROPOUT Measuring dropout voltage on the XRP6274 and XRP6275 can be a challenge. Typical dropout voltages are less than 80mV at 3Amps and 40mV at 2Amps. As a result, measuring dropout at the input and output terminals of the board will result in a much higher dropout than the part is actually providing. VIN SEN and VOUT SEN test points have been provided to accurately measure dropout performance. ENABLE (EN) If Enable is used, then R5 and C7 are not necessary and must be removed. If VIN≤EN≤(VIN+0.5V) then R6 is not necessary. When using the EN pin with a control signal greater than (VIN+0.5V), R6 is necessary to limit the EN pin current to less than 100uA. EVB has R6=10k. This will allow a control signal up to 1V above VIN. Populating R6 with a 20k will allow a control signal up to 2V above VIN. © 2014 Exar Corporation 3/7 Rev. 1.0.1 XRP6274/XRP6275 2A and 3A Ultra Low Dropout Voltage Regulators EVALUATION BOARD SCHEMATICS PGOOD R4 55k VOUT R6 10k 1 R5 100k 2 VIN 3 C6 DNP C5(OPTIONAL) 330uF C4 47uF C3(OPTIONAL) 0.1uF 4 C7 0.1uF 5 U1 XRP6274/5 PGOOD GND EN VIN VIN GND VOUT VOUT GND R1 20.0 Ohm 10 9 8 7 6 C1(OPTIONAL) 0.1uF VIN SEN C2 47uF R2 30.1 Ohm GND 0 GND IN ADJ EXP PAD EN R3 DNP VOUT SEN Note: C1, C3 and C5 are optional. The purpose of C5 is to help maintain a “stiff” voltage at the input of the Evaluation Board EVB. © 2014 Exar Corporation 4/7 Rev. 1.0.1 XRP6274/XRP6275 2A and 3A Ultra Low Dropout Voltage Regulators BILL OF MATERIAL Reference Qty. Manufacturer Designator Manufacturer Size Component Part Number PCB 1 Exar XRP6274EVB, XRP6275EVB U1 1 Exar XRP6274, XRP6275 DFN-10 Low Dropout Regulator C1, C3, C7 3 Murata GRM188R71H104KA93D 0603 CERAMIC CAP., 0.1uF, 50V, X7R, 10% C2, C4 2 Murata GRM32ER71A476KE15L 1210 CERAMIC CAP., 47uF, 10V, X7R, 10% C5 1 Murata ECASD90G337M008K00 7.3x4.3mm Polymer ALUM 330UF 4V 20% SMD C6 0 --- --- --- --- R1 1 Panasonic ERJ-3EKF20R0V 0603 Resistor 20 Ω, 1/10w, 1%, SMD R2 1 Panasonic ERJ-3EKF30R1V 0603 Resistor 30.1 Ω, 1/10w, 1%, SMD R3 0 --- --- --- --- R4 1 Panasonic ERJ-3EKF5492V 0603 Resistor 54.9k Ω, 1/10W, 1%, SMD R5 1 Panasonic ERJ-3EKF1003V 0603 Resistor 100k Ω, 1/10W, 1%, SMD R6 1 Panasonic ERJ-3EKF1002V 0603 Resistor 10k Ω, 1/10W, 1%, SMD VIN, VOUT 2 Johnson/Emerson 108-0902-001 CONN. JACK BANANA RED GND IN, GND EN, PGOOD, VIN SEN, VOUT SEN 2 Johnson/Emerson 108-0903-001 CONN. JACK BANANA BLK 4 Vector K24C/M © 2014 Exar Corporation 5/7 XRP6274-XRP6275 Evaluation kit 0.042" Test Point Post Rev. 1.0.1 XRP6274/XRP6275 2A and 3A Ultra Low Dropout Voltage Regulators EVALUATION BOARD LAYOUT Fig. 3: Component Placement – Top Side Fig. 4: Layout – Top Side Fig. 5: Layout – Bottom Side © 2014 Exar Corporation 6/7 Rev. 1.0.1 XRP6274/XRP6275 2A and 3A Ultra Low Dropout Voltage Regulators DOCUMENT REVISION HISTORY Revision Date Description 1.0.0 01/13/14 Initial release of document 1.0.1 02/05/14 Corrected R1, R2 value in BOM BOARD REVISION HISTORY Board Revision Date 146-6699-03 12/17/13 Description Initial release of evaluation board FOR FURTHER ASSISTANCE Email: customersupport@exar.com powertechsupport@exar.com Exar Technical Documentation: http://www.exar.com/TechDoc/default.aspx? EXAR CORPORATION HEADQUARTERS AND SALES OFFICES 48720 Kato Road Fremont, CA 94538 – USA Tel.: +1 (510) 668-7000 Fax: +1 (510) 668-7030 www.exar.com NOTICE EXAR Corporation reserves the right to make changes to the products contained in this publication in order to improve design, performance or reliability. EXAR Corporation assumes no responsibility for the use of any circuits described herein, conveys no license under any patent or other right, and makes no representation that the circuits are free of patent infringement. Charts and schedules contained here in are only for illustration purposes and may vary depending upon a user’s specific application. While the information in this publication has been carefully checked; no responsibility, however, is assumed for inaccuracies. EXAR Corporation does not recommend the use of any of its products in life support applications where the failure malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect safety or effectiveness. Products are not authorized for use in such applications unless EXAR Corporation receives, writing, assurances to its satisfaction that: (a) the risk of injury or damage has been minimized; (b) the user assumes such risks; (c) potential liability of EXAR Corporation is adequately protected under the circumstances. or its in all Reproduction, in part or whole, without the prior written consent of EXAR Corporation is prohibited. © 2014 Exar Corporation 7/7 Rev. 1.0.1