C16 C18 C9 C10 C11 C12 C17 C19 SW 29 RBST PVIN 28 PVIN 27 PVIN 26 PVIN 25 PVIN 24 PVIN AGND PAD 31 PVIN PVIN SW U1 XR76208 PGND PGND PGND
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1 8 9 XR760/5/8 February 05 GENERAL DESCRIPTION Rev. A The XR760, XR7605 and XR7608 are synchronous step-down regulators combining the controller, drivers, bootstrap diode and MOSFETs in a single package for point-of-load supplies. The XR760, XR7605 and XR7608 have load current ratings of A, 5A and 8A respectively. A wide5v to 40V input voltage range allows for single supply operation from industry standard 4V ±0%, 8V- 6V, and rectified 8VAC and 4VAC rails. With a proprietary emulated current mode Constant On-Time (COT) control scheme, the XR760, XR7605 and XR7608 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 0.5% 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 XR760/5/8 are available in a RoHS-compliant, green/halogen-free space-saving QFN 5x5mm package. FEATURES EVALUATION BOARD MANUAL Controller, drivers, bootstrap diode, MOSFETs integrated in one package /5/8A Step Down Regulator Wide 5V to 40V Input Voltage Range 0.6V Adjustable Output Voltage Proprietary Constant On-Time Control No Loop Compensation Required Ceramic Output Cap. Stable operation Programmable 00ns-µs On-Time Constant 400kHz-600kHz freq. Selectable CCM or CCM/DCM Operation 0-pin 5x5mm QFN package CSNB 0.56nF RSNB Ohm CBST uf DZ MMSZ4685 RZ 0k - --> DCM/CCM J - --> CCM EN/MODE C R4 5.7k R 0.k RLIM 5.49k ILIM EN PAD 4 PAD PGND PAD PAD 0 BST 9 RBST VIN C5 C4 C C C C4 T 0uF/50V 0uF/50V 0uF/50V T4 VIN+ VIN- RON C 47nF 8k TON 4 5 PGOOD U XR PGND 8 PGND 6 7 PGND 7 6 PGND PWRGD R5 0k VIN PGND IHLP uH 0-8A VOUT+ C7 C8 C5 C6 T C6 C8 C9 C0 C C C7 C9 47uF/0V 47uF/0V 47uF/0V T VOUT- CIN 0.uF C 4.7uF R6 OPEN C0 0.uF CFF 0.7nF RFF R 9.09k R k Fig. : XR7608 Evaluation Board Schematics Exar Corporation Kato Road, Fremont CA 9458, USA Tel Fax
2 XR760/5/8 PIN AIGNMENT Fig. : XR760/5/8 Pin Assignment 05 Exar Corporation / Rev. A
3 XR760/5/8 PIN DESCRIPTION ORDERING INFORMATION Refer to XR760/5/8 datasheet and/or for exact and up to date ordering information. 05 Exar Corporation / Rev. A
4 XR760/5/8 USING THE EVALUATION BOARD POWERING UP 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 T and T to monitor VOUT+ and VOUTrespectively. Apply 4V using the power supply. The XR760/5/8EVB should power up and regulate the output at.v. Input voltage range is from 5V to 40V. Maximum rated current for XR760/5/8 is /5/8A respectively. JUMPER J If the jumper is set to right side the regulator will operate in forced CCM. If the Jumper is set to the left side the regulator will operate in DCM at light load. PROGRAMMING THE OUTPUT VOLTAGE V OUT can be programmed by changing R according to: Exar Corporation 4/ Rev. A
5 XR760/5/8 XR760 EVALUATION BOARD SCHEMATICS CBST uf DZ MMSZ4685 RZ 0k - --> DCM/CCM J - --> CCM EN/MODE PWRGD C OPEN R 0.k R4 5.7k R5 RLIM 4.0k RON 8k C 47nF k PAD 4 ILIM EN TON PGOOD PAD PGND PAD PAD U XR760 VIN 8 0 BST RBST PGND 9 PGND 8 PGND 7 PGND 6 PGND 5 C5 WURTH uH C4 C 0uF/50V C C 4VIN VIN+ C4 T T4 VIN- 0-A VOUT+ C7 C8 C5 C6 C6 C8 C9 C0 C C C7 T C9 47uF/0V T VOUT- CIN 0.uF C0 0.uF CFF 0.nF C 4.7uF R6 OPEN RFF R 9.09k, 0.% R k, 0.% 05 Exar Corporation 5/ Rev. A
6 XR760/5/8 XR760EVB BILL OF MATERIAL Reference Qty. Manufacturer Manufacturer Size Component Designator Part Number PCB Exar XR760 XR760 Evaluation kit U Exar XR760 40V, A COT Regulator L Wurth Elektronik x0mm Power Inductor 4.7uH, 7.0A, 5.0 mohm DZ ON SEMI MMSZ4685TG SOD- Diode Zener.6V, 500MW, C MURATA GRME7H06KAL 0 CERAMIC CAP. 0uF, 50V, X7R, 0% C8 MURATA GRMER7A476KE5L 0 CERAMIC CER, 47uF, 0V, X7R, 0% C MURATA GRMBR7C475KA7L 0805 CERAMIC CAP, 4.7uF, 6V, X7R, 0% CIN, C0 MURATA GRM88R7H04KA9D 060 CERAMIC CAP., 0.uF, 50V, X7R, 0% CBST MURATA GRM88R7C05KAD 060 CERAMIC CAP.,.0 uf, 6V, X7R, 0% CFF MURATA GRM88R7HKA0D 060 CERAMIC CAP., 0 pf, 50V, X7R, 0% C MURATA GRM88R7H47KA6D 060 CERAMIC CAP uF, 50V,X7R,0% R PANASONIC ERJ-EKF909V 060 Resistor 9.09K Ohm, /0W,%,SMD R5,RZ PANASONIC ERJ-EKF00V 060 Resistor 0.0K Ohm, /0W,%,SMD R PANASONIC ERJ-EKF0V 060 Resistor 0.K Ohm, /0W,%,SMD R4 PANASONIC ERJ-EKF57V 060 Resistor 5.7K Ohm, /0W, %, SMD RFF, RBST PANASONIC ERJ-GEY0R00V 060 Resistor 0.0, Jumper, /0W, SMD R PANASONIC ERA-YEB0V 060 Resistor.0K Ohm, /0W, 0.%, SMD RLIM PANASONIC ERJ-EKF40V 060 Resistor 4.0K Ohm, /0W,%,SMD RON PANASONIC ERJ-EKF80V 060 Resisrtor 8.0K Ohm, /0W,%, SMD J Wurth Elektronik 600 -PIN CONNECTOR VIN+, VOUT+, VIN-,VOUT- 4 Wurth Elektronik CONNECTOR BLADE TERMINAL T,T,T,T4,,,PWR GD,, EN_MODE 9 Wurth Elektronik 600 SINGLE Test Point Post 05 Exar Corporation 6/ Rev. A
7 XR760/5/8 XR7605 EVALUATION BOARD SCHEMATICS CSNB 0.nF RSNB Ohm CBST uf DZ MMSZ4685 RZ 0k - --> DCM/CCM J - --> CCM EN/MODE PWRGD C OPEN R 0.k R4 5.7k R5 RLIM 8.06k RON 9.4k C 47nF k PAD 4 ILIM EN TON PGOOD PAD PGND PAD PAD U XR7605 VIN 8 0 BST RBST PGND 9 PGND 8 PGND 7 PGND 6 PGND 5 C5 WURTH uH C4 C C C 0uF/50V 0uF/50V 4VIN VIN+ C4 T T4 VIN- 0-5A VOUT+ C7 C8 C5 C6 C6 C8 C9 C0 C C C7 T C9 47uF/0V 47uF/0V T VOUT- CIN 0.uF C0 0.uF CFF 0.7nF C 4.7uF R6 OPEN RFF R 9.09k, 0.% R k, 0.% 05 Exar Corporation 7/ Rev. A
8 XR760/5/8 XR7605EVB BILL OF MATERIAL Reference Qty. Manufacturer Manufacturer Size Component Designator Part Number PCB Exar XR7605 XR7605 Evaluation Kit U Exar XR V, 5A COT Regulator L Wurth Elektronik x0mm Power Inductor.uH, 8.0A,.8mOhm DZ ON SEMI MMSZ4685TG SOD- Diode Zener.6V, 500MW, C, C MURATA GRME7H06KAL 0 CERAMIC CAP. 0uF, 50V, X7R, 0% C7, C8 MURATA GRMER7A476KE5L 0 CERAMIC CER, 47uF, 0V, X7R, 0% C MURATA GRMBR7C475KA7L 0805 CERAMIC CAP, 4.7uF, 6V, X7R, 0% CIN, C0 MURATA GRM88R7H04KA9D 060 CERAMIC CAP., 0.uF, 50V, X7R, 0% CBST MURATA GRM88R7C05KAD 060 CERAMIC CAP.,.0 Uf, 6V, X7R, 0% CFF MURATA GRM88R7H7KA0D 060 CERAMIC CAP., 70 pf, 50V, X7R, 0% CSNB MURATA GRM88R7HKA0D 060 CERAMIC CAP. 0. nf, 50V,X7R,0% C MURATA GRM88R7H47KA6D 060 CERAMIC CAP uF, 50V,X7R,0% R PANASONIC ERJ-EKF909V 060 Resistor 9.09K Ohm, /0W,%,SMD R5,RZ PANASONIC ERJ-EKF00V 060 Resistor 0.0K Ohm, /0W,%,SMD R PANASONIC ERJ-EKF0V 060 Resistor 0.K Ohm, /0W,%,SMD R4 PANASONIC ERJ-EKF57V 060 Resistor 5.7K Ohm, /0W, %, SMD RFF, RBST PANASONIC ERJ-GEY0R00V 060 Resistor 0.0, Jumper, /0W, SMD R PANASONIC ERA-YEB0V 060 Resistor.0K Ohm, /0W, 0.%, SMD RLIM PANASONIC ERJ-EKF806V 060 Resistor 8.06K Ohm, /0W,%,SMD RON PANASONIC ERJ-EKF94V 060 Resisrtor 9.4K Ohm, /0W,%, SMD RSNB PANASONIC ERJ-6RQFR0V 0805 Resistor.,/8W,%,SMD J Wurth Elektronik 600 -PIN CONNECTOR VIN+, VOUT+, VIN-,VOUT- 4 Wurth Elektronik CONNECTOR BLADE TERMINAL T,T,T,T4,,,PWR GD,, EN_MODE 9 Wurth Elektronik 600 SINGLE Test Point Post 05 Exar Corporation 8/ Rev. A
9 XR760/5/8 XR7608 EVALUATION BOARD SCHEMATICS CSNB 0.56nF RSNB Ohm CBST uf DZ MMSZ4685 RZ 0k - --> DCM/CCM J - --> CCM EN/MODE PWRGD C R4 5.7k C R5 0k R 0.k RLIM 5.49k RON 8k 47nF ILIM EN TON PGOOD 4 PAD PAD PGND PAD PAD U XR7608 VIN 8 0 BST RBST PGND 9 PGND 8 PGND 7 PGND 6 PGND 5 IHLP uH C5 C4 C 0uF/50V C 0uF/50V 4VIN VIN+ C C4 T 0uF/50V T4 VIN- 0-8A VOUT+ C7 C8 C5 C6 C6 C8 C9 C0 C C C7 T C9 47uF/0V 47uF/0V 47uF/0V T VOUT- CIN 0.uF C 4.7uF R6 OPEN C0 0.uF CFF 0.7nF RFF R 9.09k R k 05 Exar Corporation 9/ Rev. A
10 XR760/5/8 XR7608EVB BILL OF MATERIAL Reference Qty. Manufacturer Manufacturer Size Component Designator Part Number PCB Exar XR7608 XR7608 Evaluation kit U Exar XR V, 8A COT Regulator L Vishay IHLP5050FDERRM0.9x.mm Inductor High Current.uH, A, 4. mohm DZ ON SEMI MMSZ4685TG SOD- Diode Zener.6V, 500MW, C, C, C MURATA GRME7H06KAL 0 CERAMIC CAP. 0uF, 50V, X7R, 0% C6,C7, C8 MURATA GRMER7A476KE5L 0 CERAMIC CER, 47uF, 0V, X7R, 0% C MURATA GRMBR7C475KA7L 0805 CERAMIC CAP, 4.7uF, 6V, X7R, 0% CIN, C0 MURATA GRM88R7H04KA9D 060 CERAMIC CAP., 0.uF, 50V, X7R, 0% CBST MURATA GRM88R7C05KAD 060 CERAMIC CAP.,.0 Uf, 6V, X7R, 0% CFF MURATA GRM88R7H7KA0D 060 CERAMIC CAP., 70 pf, 50V, X7R, 0% CSNB MURATA GRM88R7H56KA0D 060 CERAMIC CAP nf, 50V,X7R,0% C MURATA GRM88R7H47KA6D 060 CERAMIC CAP uF, 50V,X7R,0% R PANASONIC ERJ-EKF909V 060 Resistor 9.09K Ohm, /0W,%,SMD R5,RZ PANASONIC ERJ-EKF00V 060 Resistor 0.0K Ohm, /0W,%,SMD R PANASONIC ERJ-EKF0V 060 Resistor 0.K Ohm, /0W,%,SMD R4 PANASONIC ERJ-EKF57V 060 Resistor 5.7K Ohm, /0W, %, SMD RFF, RBST PANASONIC ERJ-GEY0R00V 060 Resistor 0.0, Jumper, /0W, SMD R PANASONIC ERA-YEB0V 060 Resistor.0K Ohm, /0W, 0.%, SMD RLIM PANASONIC ERJ-EKF549V 060 Resisrtor 5.49K Ohm, /0W,%, SMD RON PANASONIC ERJ-EKF80V 060 Resisrtor 8.0K Ohm, /0W,%, SMD RSNB PANASONIC ERJ-6RQFR0V 0805 Resistor.,/8W,%,SMD J Wurth Elektronik 600 -PIN CONNECTOR VIN+, VOUT+, VIN-,VOUT- 4 Wurth Elektronik CONNECTOR BLADE TERMINAL T,T,T,T4,,,PWR GD,, EN_MODE 9 Wurth Elektronik 600 SINGLE Test Point Post 05 Exar Corporation 0/ Rev. A
11 XR760/5/8 EVALUATION BOARD LAYOUT Fig. : Top components Fig. 4: Bottom components Fig. 5: Top Fig. 6: Bottom 05 Exar Corporation / Rev. A
12 XR760/5/8 Fig. 7: Layer, GND Fig. 8: Layer, Fig. 9: Layer 4, GND Fig. 0: Layer 5, 05 Exar Corporation / Rev. A
13 XR760/5/8 DOCUMENT REVISION HISTORY Revision Date Description A 0/0/5 Initial release of document BOARD REVISION HISTORY Board Revision Date Description REV. 0/0/5 Initial release of evaluation board FOR FURTHER AISTANCE Exar Technical Documentation: customersupport@exar.com powertechsupport@exar.com EXAR CORPORATION HEADQUARTERS AND SALES OFFICES 4870 Kato Road Fremont, CA 9458 USA Tel.: + (50) Fax: + (50) 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. 05 Exar Corporation / Rev. A
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