STEVAL-ISA077V2

STEVAL-ISA077V2 High efficiency synchronous rectifier step-up converter demonstration board based on the L6920D Data brief Features ■ 0.6 V to 5.5 V operating input voltage ■ 1 V startup input voltage ■ Internal synchronous rectifier ■ Zero shutdown current ■ 3.3 V and 5 V fixed or adjustable ■ Output voltage (2 V up to 5.2 V) ■ 120 mΩ internal active switch ■ Low battery voltage detection ■ Reverse battery protection ■ RoHS compliant STEVAL-ISA077V2 Description The STEVAL-ISA077V2 demonstration board is based on the L6920D high efficiency step-up converter as well as the external components required for a typical application. Startup is guaranteed at 1 V and the device operates down to 0.6 V. The output voltage can be adjusted from 2 V to 5.2 V and two fixed output voltages (3.3 V and 5 V) are also available. November 2010 Doc ID 18238 Rev 1 For further information contact your local STMicroelectronics sales office. 1/4 www.st.com 4 Circuit schematic STEVAL-ISA077V2 1 Circuit schematic Figure 1. Circuit schematic Panasonic ELL6RH100M +VBATT R1 N.C. LBI C2 47µF 7 GND 8 C4 100nF 4 L6920 6 1 F.B. VOUT VOUT C3 N.C. R3 N.C. 3 GND 5 C1 47µF Panasonic EEFCDJ470R GND LBO LBO SHDN J1 1 2 3 SHDN 1 R4 N.C. 3 R5 N.C. 2 J2 not mounted components 2/4 Panasonic EEFCDJ470R 2 R2 N.C. VREF +VBATT L1 10µH VBATT Doc ID 18238 Rev 1 D01IN1310 STEVAL-ISA077V2 2 Revision history Revision history Table 1. Document revision history Date Revision 17-Nov-2010 1 Changes Initial release. Doc ID 18238 Rev 1 3/4 STEVAL-ISA077V2 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. If any part of this document refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of such third party products or services or any intellectual property contained therein. UNLESS OTHERWISE SET FORTH IN ST’S TERMS AND CONDITIONS OF SALE ST DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY WITH RESPECT TO THE USE AND/OR SALE OF ST PRODUCTS INCLUDING WITHOUT LIMITATION IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION), OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. UNLESS EXPRESSLY APPROVED IN WRITING BY AN AUTHORIZED ST REPRESENTATIVE, ST PRODUCTS ARE NOT RECOMMENDED, AUTHORIZED OR WARRANTED FOR USE IN MILITARY, AIR CRAFT, SPACE, LIFE SAVING, OR LIFE SUSTAINING APPLICATIONS, NOR IN PRODUCTS OR SYSTEMS WHERE FAILURE OR MALFUNCTION MAY RESULT IN PERSONAL INJURY, DEATH, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE. ST PRODUCTS WHICH ARE NOT SPECIFIED AS "AUTOMOTIVE GRADE" MAY ONLY BE USED IN AUTOMOTIVE APPLICATIONS AT USER’S OWN RISK. Resale of ST products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever, any liability of ST. ST and the ST logo are trademarks or registered trademarks of ST in various countries. Information in this document supersedes and replaces all information previously supplied. The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners. © 2010 STMicroelectronics - All rights reserved STMicroelectronics group of companies Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Philippines - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America www.st.com 4/4 Doc ID 18238 Rev 1