XR76205EVB

XR76203/5/8 40V, 3/5/8A Synchronous Step Down COT Regulator February 2015 Rev. 1A GENERAL DESCRIPTION EVALUATION BOARD MANUAL The XR76203, XR76205 and XR76208 are synchronous step-down regulators combining the controller, drivers, bootstrap diode and MOSFETs in a single package for point-of-load supplies. The XR76203, XR76205 and XR76208 have load current ratings of 3A, 5A and 8A respectively. A wide5V to 40V input voltage range allows for single supply operation from industry standard 24V ±10%, 18V36V, and rectified 18VAC and 24VAC rails. With a proprietary emulated current mode Constant On-Time (COT) control scheme, the XR76203, XR76205 and XR76208 provide extremely fast line and load transient response using ceramic output capacitors. They require no loop compensation, simplifying circuit implementation and reducing overall component count. The control loop also provides 0.07% load and 0.15% line regulation and maintains constant operating frequency. A selectable power saving mode allows the user to operate in discontinuous conduction mode (DCM) at light current loads thereby significantly increasing the converter efficiency. A host of protection features, including over-current, over-temperature, short-circuit and UVLO, helps achieve safe operation under abnormal operating conditions. The XR76203/5/8 are available in a RoHS-compliant, green/halogen-free space-saving QFN 5x5mm package. CBST 1uF RBST 0 Ohm − ≥0.6V Adjustable Output Voltage • Proprietary Constant On-Time Control − No Loop Compensation Required − Ceramic Output Cap. Stable operation − Programmable 200ns-2µs On-Time − Constant 400kHz-600kHz freq. − Selectable CCM or CCM/DCM Operation • 30-pin 5x5mm QFN package 26 24 25 27 29 30 31 23 PVIN PVIN PVIN PVIN PVIN PVIN SW 32 SW U1 SS PGND XR76208 PGOOD PGND FB PGND AGND PGND 10 C1 C2 C3 C4 T3 PGND T4 VIN- 22 21 20 19 18 17 16 15 SW VCC VIN 8 10k 9 FB VCC AGND PWRGD IHLP-5050-01 2.2uH 14 7 TON C14 10uF/50V 10uF/50V 10uF/50V PVIN SW 6 VIN+ 24VIN C15 PVIN 13 5 EN SW 4 SS ILIM SW 47nF 3 12 CSS 28k 11 5.49k 1 2 RON BST SW RLIM EN/MODE AGND PAD 34 1-2 --> CCM R5 − Wide 5V to 40V Input Voltage Range R3 30.1k R4 35.7k 33 3 2 1 • 3/5/8A Step Down Regulator 1 Ohm SW PAD 3 2 1 • Controller, drivers, bootstrap diode, MOSFETs integrated in one package 10k PVIN PAD J1 RSNB RZ PGND PAD C13 2-3 --> DCM/CCM 0.56nF MMSZ4685 28 CSNB DZ FEATURES VOUT+ 400kHz, 3.3V @ 0-8A T1 C7 SW CIN 0.1uF PVIN C8 47uF/10V 47uF/10V C20 0.1uF C5 C6 C16 C18 C9 C10 47uF/10V C11 C12 C17 C19 T2 VOUT- CFF 0.27nF R6 OPEN CVCC 4.7uF RFF 0 Ohm R1 9.09k VCC FB FB R2 2k AGND Fig. 1: XR76208 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 XR76203/5/8 40V, 3/5/8A Synchronous Step Down COT Regulator PIN ASSIGNMENT Fig. 2: XR76203/5/8 Pin Assignment © 2015 Exar Corporation 2/13 Rev. 1A XR76203/5/8 40V, 3/5/8A Synchronous Step Down COT Regulator PIN DESCRIPTION ORDERING INFORMATION Refer to XR76203/5/8 datasheet and/or www.exar.com for exact and up to date ordering information. © 2015 Exar Corporation 3/13 Rev. 1A XR76203/5/8 40V, 3/5/8A Synchronous Step Down COT Regulator USING THE EVALUATION BOARD JUMPER J1 POWERING UP If the jumper is set to right side the regulator will operate in “forced CCM”. Connect the VIN+/VIN- with short/thick leads to power supply. Use test pins T4 and T4 to monitor VIN+ and VIN- respectively. Connect VOUT+/VOUTwith short/thick leads to an electronic load. Use test pins T1 and T2 to monitor VOUT+ and VOUTrespectively. Apply 24V using the power supply. The XR76203/5/8EVB should power up and regulate the output at 3.3V. Input voltage range is from 5V to 40V. Maximum rated current for XR76203/5/8 is 3/5/8A respectively. © 2015 Exar Corporation If the Jumper is set to the left side the regulator will operate in DCM at light load. PROGRAMMING THE OUTPUT VOLTAGE VOUT can be programmed by changing R1 according to: 1 4/13 2 0.6 1 Rev. 1A XR76203/5/8 40V, 3/5/8A Synchronous Step Down COT Regulator RZ 24 25 27 29 30 31 23 PVIN PVIN PVIN PVIN PVIN PVIN SW BST XR76203 PGOOD PGND FB PGND AGND PGND 10 8 C2 C3 C4 T3 T4 PGND VIN- 21 20 19 18 17 16 15 SW 10k VCC VIN VCC 9 FB AGND PWRGD C1 22 WURTH 74437368047 4.7uH 14 7 PGND SW 6 U1 SS C14 10uF/50V SW 13 SS C15 PVIN TON SW 4 EN 12 47nF 3 VIN+ 24VIN PVIN SW 28k 5 R5 0 Ohm 11 2 RON ILIM AGND PAD 4.02k 1 EN/MODE PVIN PAD SW RLIM 32 R4 35.7k 1-2 --> CCM CSS RBST R3 30.1k 33 OPEN PGND PAD C13 3 2 1 34 J1 3 2 1 1uF 10k SW PAD 2-3 --> DCM/CCM CBST 26 MMSZ4685 SW DZ 28 XR76203 EVALUATION BOARD SCHEMATICS VOUT+ 400kHz, 3.3V @ 0-3A T1 C7 SW CIN 0.1uF C5 C6 C16 C18 47uF/10V C20 PVIN C8 0.1uF C9 C10 C11 C12 C17 C19 T2 VOUT- CFF 0.22nF R6 OPEN CVCC 4.7uF RFF 0 Ohm R1 9.09k, 0.1% VCC FB FB R2 2k, 0.1% AGND © 2015 Exar Corporation 5/13 Rev. 1A XR76203/5/8 40V, 3/5/8A Synchronous Step Down COT Regulator XR76203EVB BILL OF MATERIAL Reference Designator Qty. Manufacturer Manufacturer Part Number Size Component PCB 1 Exar XR76203 XR76203 Evaluation kit U1 1 Exar XR76203 40V, 3A COT Regulator L1 1 Wurth Elektronik 74437368047 11x10mm DZ 1 ON SEMI MMSZ4685T1G SOD-123 Power Inductor 4.7uH, 7.0A, 15.0 mOhm Diode Zener 3.6V, 500MW, C1 1 MURATA GRM32E71H106KA12L 1210 CERAMIC CAP. 10uF, 50V, X7R, 10% C8 1 MURATA GRM32ER71A476KE15L 1210 CERAMIC CER, 47uF, 10V, X7R, 10% CVCC 1 MURATA GRM21BR71C475KA73L 0805 CERAMIC CAP , 4.7uF, 16V, X7R, 10% CIN, C20 2 MURATA GRM188R71H104KA93D 0603 CERAMIC CAP., 0.1uF, 50V, X7R, 10% CBST 1 MURATA GRM188R71C105KA12D 0603 CERAMIC CAP., 1.0 uF, 16V, X7R, 10% CFF 1 MURATA GRM188R71H221KA01D 0603 CERAMIC CAP. , 220 pF, 50V, X7R, 10% CSS 1 MURATA GRM188R71H473KA61D 0603 CERAMIC CAP. 0.047uF, 50V,X7R,10% R1 1 PANASONIC ERJ-3EKF9091V 0603 Resistor 9.09K Ohm, 1/10W,1%,SMD R5,RZ 2 PANASONIC ERJ-3EKF1002V 0603 Resistor 10.0K Ohm, 1/10W,1%,SMD R3 1 PANASONIC ERJ-3EKF3012V 0603 Resistor 30.1K Ohm, 1/10W,1%,SMD R4 1 PANASONIC ERJ-3EKF3572V 0603 Resistor 35.7K Ohm, 1/10W, 1%, SMD RFF, RBST 2 PANASONIC ERJ-3GEY0R00V 0603 Resistor 0.00 Ohm, Jumper, 1/10W, SMD R2 RLIM RON J1 1 1 1 1 PANASONIC PANASONIC PANASONIC Wurth Elektronik ERA-3YEB202V ERJ-3EKF4021V ERJ-3EKF2802V 61300311121 0603 0603 0603 Resistor 2.0K Ohm, 1/10W, 0.1%, SMD Resistor 4.02K Ohm, 1/10W,1%,SMD Resisrtor 28.0K Ohm, 1/10W,1%, SMD 3-PIN CONNECTOR VIN+, VOUT+, VIN-,VOUTT1,T2,T3,T4,SS,VCC,PWR GD, AGND, EN_MODE 4 Wurth Elektronik 7471287 CONNECTOR BLADE TERMINAL 9 Wurth Elektronik 61300111121 SINGLE Test Point Post © 2015 Exar Corporation 6/13 Rev. 1A XR76203/5/8 40V, 3/5/8A Synchronous Step Down COT Regulator XR76205 EVALUATION BOARD SCHEMATICS 0 Ohm 26 24 25 27 29 30 31 23 PVIN PVIN PVIN PVIN PVIN PVIN SW PGND XR76205 PGOOD PGND FB PGND AGND PGND C2 C3 C4 T3 T4 PGND VIN- 21 20 19 18 17 16 15 SW VCC 10 8 10k 9 VIN FB VCC AGND PWRGD C1 22 WURTH 74437368033 3.3uH 14 7 SS SW 6 U1 C14 10uF/50V 10uF/50V SW 13 SS C15 PVIN TON SW 4 EN 12 47nF 3 VIN+ 24VIN PVIN SW 29.4k 5 R5 RBST 11 2 RON ILIM BST 8.06k 1 PVIN PAD SW RLIM EN/MODE 32 R4 35.7k 1-2 --> CCM CSS 1uF R3 30.1k AGND PAD OPEN 33 C13 3 2 1 CBST 10k 34 J1 3 2 1 RZ 1 Ohm PGND PAD 2-3 --> DCM/CCM MMSZ4685 RSNB SW PAD DZ 0.33nF 28 CSNB VOUT+ 400kHz, 3.3V @ 0-5A T1 C7 SW CIN 0.1uF C5 C6 C16 C18 47uF/10V47uF/10V C20 PVIN C8 0.1uF C9 C10 C11 C12 C17 C19 T2 VOUT- CFF 0.27nF R6 OPEN CVCC 4.7uF RFF 0 Ohm R1 9.09k, 0.1% VCC FB FB R2 2k, 0.1% AGND © 2015 Exar Corporation 7/13 Rev. 1A XR76203/5/8 40V, 3/5/8A Synchronous Step Down COT Regulator XR76205EVB BILL OF MATERIAL Reference Designator Qty. Manufacturer Manufacturer Part Number Size Component PCB 1 Exar XR76205 U1 1 Exar XR76205 L1 1 Wurth Elektronik 74437368033 11x10mm DZ 1 ON SEMI MMSZ4685T1G SOD-123 Diode Zener 3.6V, 500MW, C1, C2 2 MURATA GRM32E71H106KA12L 1210 CERAMIC CAP. 10uF, 50V, X7R, 10% XR76205 Evaluation Kit 40V, 5A COT Regulator Power Inductor 3.3uH, 8.0A, 11.8mOhm C7, C8 2 MURATA GRM32ER71A476KE15L 1210 CERAMIC CER, 47uF, 10V, X7R, 10% CVCC 1 MURATA GRM21BR71C475KA73L 0805 CERAMIC CAP , 4.7uF, 16V, X7R, 10% CIN, C20 2 MURATA GRM188R71H104KA93D 0603 CERAMIC CAP., 0.1uF, 50V, X7R, 10% CBST 1 MURATA GRM188R71C105KA12D 0603 CERAMIC CAP., 1.0 Uf, 16V, X7R, 10% CERAMIC CAP. , 270 pF, 50V, X7R, 10% CFF 1 MURATA GRM188R71H271KA01D 0603 CSNB 1 MURATA GRM188R71H331KA01D 0603 CERAMIC CAP. 0.33 nF, 50V,X7R,10% CSS 1 MURATA GRM188R71H473KA61D 0603 CERAMIC CAP. 0.047uF, 50V,X7R,10% R1 1 PANASONIC ERJ-3EKF9091V 0603 Resistor 9.09K Ohm, 1/10W,1%,SMD R5,RZ 2 PANASONIC ERJ-3EKF1002V 0603 Resistor 10.0K Ohm, 1/10W,1%,SMD R3 1 PANASONIC ERJ-3EKF3012V 0603 Resistor 30.1K Ohm, 1/10W,1%,SMD R4 1 PANASONIC ERJ-3EKF3572V 0603 Resistor 35.7K Ohm, 1/10W, 1%, SMD RFF, RBST 2 PANASONIC ERJ-3GEY0R00V 0603 Resistor 0.00 Ohm, Jumper, 1/10W, SMD R2 RLIM RON RSNB J1 1 1 1 1 1 PANASONIC PANASONIC PANASONIC PANASONIC Wurth Elektronik ERA-3YEB202V ERJ-3EKF8061V ERJ-3EKF2942V ERJ-6RQF1R0V 61300311121 0603 0603 0603 0805 Resistor 2.0K Ohm, 1/10W, 0.1%, SMD Resistor 8.06K Ohm, 1/10W,1%,SMD Resisrtor 29.4K Ohm, 1/10W,1%, SMD Resistor 1.0 Ohm,1/8W,1%,SMD 3-PIN CONNECTOR VIN+, VOUT+, VIN-,VOUTT1,T2,T3,T4,SS,VCC,PWR GD, AGND, EN_MODE 4 Wurth Elektronik 7471287 CONNECTOR BLADE TERMINAL 9 Wurth Elektronik 61300111121 SINGLE Test Point Post © 2015 Exar Corporation 8/13 Rev. 1A XR76203/5/8 40V, 3/5/8A Synchronous Step Down COT Regulator XR76208 EVALUATION BOARD SCHEMATICS RBST 0 Ohm 7 24 25 27 29 30 31 23 PVIN PVIN PVIN PVIN PVIN PVIN SW BST 32 FB PGND AGND PGND VCC 10 8 10k 9 VIN FB VCC AGND PWRGD C2 C3 10uF/50V 10uF/50V 10uF/50V C4 T3 T4 VIN- 20 19 18 17 16 15 PGND SW 6 PGND IHLP-5050-01 2.2uH 14 SS XR76208 C1 21 PGND PGOOD C14 22 SW U1 SS SW 5 C15 PVIN TON 13 4 EN SW 47nF 3 12 CSS 28k VIN+ 24VIN PVIN SW RON ILIM 11 2 AGND PAD 5.49k 1 PVIN PAD SW RLIM EN/MODE 33 R4 35.7k 1-2 --> CCM R5 1uF R3 30.1k PGND PAD C13 3 2 1 CBST 10k 34 J1 3 2 1 RZ 1 Ohm SW PAD 2-3 --> DCM/CCM MMSZ4685 RSNB 26 DZ 0.56nF 28 CSNB VOUT+ 400kHz, 3.3V @ 0-8A T1 C7 SW CIN 0.1uF PVIN C8 47uF/10V 47uF/10V C20 0.1uF C5 C6 47uF/10V C16 C18 C9 C10 C11 C12 C17 C19 T2 VOUT- CFF 0.27nF R6 OPEN CVCC 4.7uF RFF 0 Ohm R1 9.09k VCC FB FB R2 2k AGND © 2015 Exar Corporation 9/13 Rev. 1A XR76203/5/8 40V, 3/5/8A Synchronous Step Down COT Regulator XR76208EVB BILL OF MATERIAL Reference Designator Qty. Manufacturer Manufacturer Part Number Size Component PCB 1 Exar XR76208 U1 1 Exar XR76208 L1 1 Vishay IHLP5050FDER2R2M01 12.9x13.2mm DZ 1 ON SEMI MMSZ4685T1G SOD-123 Diode Zener 3.6V, 500MW, C1, C2, C3 3 MURATA GRM32E71H106KA12L 1210 CERAMIC CAP. 10uF, 50V, X7R, 10% XR76208 Evaluation kit 40V, 8A COT Regulator Inductor High Current 2.2uH, 22A, 4.2 mOhm C6,C7, C8 3 MURATA GRM32ER71A476KE15L 1210 CERAMIC CER, 47uF, 10V, X7R, 10% CVCC 1 MURATA GRM21BR71C475KA73L 0805 CERAMIC CAP , 4.7uF, 16V, X7R, 10% CIN, C20 2 MURATA GRM188R71H104KA93D 0603 CERAMIC CAP., 0.1uF, 50V, X7R, 10% CBST 1 MURATA GRM188R71C105KA12D 0603 CERAMIC CAP., 1.0 Uf, 16V, X7R, 10% CERAMIC CAP. , 270 pF, 50V, X7R, 10% CFF 1 MURATA GRM188R71H271KA01D 0603 CSNB 1 MURATA GRM188R71H561KA01D 0603 CERAMIC CAP. 0.56 nF, 50V,X7R,10% CSS 1 MURATA GRM188R71H473KA61D 0603 CERAMIC CAP. 0.047uF, 50V,X7R,10% R1 1 PANASONIC ERJ-3EKF9091V 0603 Resistor 9.09K Ohm, 1/10W,1%,SMD R5,RZ 2 PANASONIC ERJ-3EKF1002V 0603 Resistor 10.0K Ohm, 1/10W,1%,SMD R3 1 PANASONIC ERJ-3EKF3012V 0603 Resistor 30.1K Ohm, 1/10W,1%,SMD R4 1 PANASONIC ERJ-3EKF3572V 0603 Resistor 35.7K Ohm, 1/10W, 1%, SMD RFF, RBST 2 PANASONIC ERJ-3GEY0R00V 0603 Resistor 0.00 Ohm, Jumper, 1/10W, SMD R2 RLIM RON RSNB J1 1 1 1 1 1 PANASONIC PANASONIC PANASONIC PANASONIC Wurth Elektronik ERA-3YEB202V ERJ-3EKF5491V ERJ-3EKF2802V ERJ-6RQF1R0V 61300311121 0603 0603 0603 0805 Resistor 2.0K Ohm, 1/10W, 0.1%, SMD Resisrtor 5.49K Ohm, 1/10W,1%, SMD Resisrtor 28.0K Ohm, 1/10W,1%, SMD Resistor 1.0 Ohm,1/8W,1%,SMD 3-PIN CONNECTOR VIN+, VOUT+, VIN-,VOUTT1,T2,T3,T4,SS,VCC,PWR GD, AGND, EN_MODE 4 Wurth Elektronik 7471287 CONNECTOR BLADE TERMINAL 9 Wurth Elektronik 61300111121 SINGLE Test Point Post © 2015 Exar Corporation 10/13 Rev. 1A XR76203/5/8 40V, 3/5/8A Synchronous Step Down COT Regulator EVALUATION BOARD LAYOUT Fig. 3: Top components Fig. 4: Bottom components Fig. 5: Top Fig. 6: Bottom © 2015 Exar Corporation 11/13 Rev. 1A XR76203/5/8 40V, 3/5/8A Synchronous Step Down COT Regulator Fig. 7: Layer 2, GND 1 Fig. 8: Layer 3, VCC1 Fig. 9: Layer 4, GND 2 Fig. 10: Layer 5, VCC2 © 2015 Exar Corporation 12/13 Rev. 1A XR76203/5/8 40V, 3/5/8A Synchronous Step Down COT Regulator DOCUMENT REVISION HISTORY Revision Date 1A 02/20/15 Description Initial release of document BOARD REVISION HISTORY Board Revision Date REV 3.1 02/20/15 Description Initial release of evaluation board FOR FURTHER ASSISTANCE Email: customersupport@exar.com powertechsupport@exar.com Exar Technical Documentation: http://www.exar.com/TechDoc/ 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 herein 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 or malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. Products are not authorized for use in such applications unless EXAR Corporation receives, in writing, assurances to its satisfaction that: (a) the risk of injury or damage has been minimized; (b) the user assumes all such risks; (c) potential liability of EXAR Corporation is adequately protected under the circumstances. Reproduction, in part or whole, without the prior written consent of EXAR Corporation is prohibited. © 2015 Exar Corporation 13/13 Rev. 1A