ST EVAL5980 0.7 A step-down switching regulator demonstration board based on the L5980 handbook
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1. SZ EVAL5980 0 7 A step down switching regulator demonstration board based on the L5980 Features 0 7 A DC output current 2 9 V to 18 V input voltage Output voltage adjustable from 0 6 V to 16 V 250 kHz switching frequency programmable up to 1 MHz Internal soft start and inhibit Low dropout operation 100 duty cycle Zero load current operation Over current and thermal protection VFQFPN8 3 mm x 3 mm package Description The EVAL5980 demonstration board provides the design engineer with a fully functional step down switching regulator with an output current of up to 0 7 A The L5980 integrates ST Microelectronics step down switching regulator together with all the external components required for a typical application The rated voltage of the input capacitor and the Schottky diode rectifier repetitive peak reverse voltage are both 25 V making the board capable of covering the entire 2 9 V 18 V input voltage range of the L5980 device The board features an external resistor divider R1 and R2 designed for an output voltage of 3 3 V The output voltage can be set to a level from 0 6 V up to the rated voltage of the output capacitor 16 V March 2009 For further information contact your local STMicroelectronics sales office Data Brief EVAL5980 The compensation network on the demonstration board allows the use of MLCC as output filter to keep the loop stable The inductor saturation current and2. 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
3. forward current of the Schottky diode are within the current limit values The switching frequency on the demonstration board is set to 500 kHz by means of the R5 resistor connected to pin Fsw Rev 1 1 6 www st com EVAL5980 1 a EVAL5980 application circuit and component list EVAL5980 application circuit and component list Figure 1 Application circuit VIN 3 3V to 18V L1 15uH Vout 3 3V i i D1 STPS2L25U R1 4 99K C1 C6 10uF 68nF C3 3 3nF C5 150pF Table 1 Component list meone emmer tein Manor e e e e a 2 6 EVAL5980 PCB layout 2 PCB layout Figure 2 PCB layout component side EVAL5980 Figure 3 PCB layout bottom side E L Figure 4 PCB layout front side EVAL5980 3 Package mechanical data Package mechanical data In order to meet environmental requirements ST offers these devices in different grades of ECOPACK packages depending on their level of environmental compliance ECOPACK specifications grade definitions and product status are available at www st com ECOPACK is an ST trademark 4 6 EVAL5980 4 Revision history Revision history Table 2 Document revision history S One 02 Mar 2009 Initial release 5 6 EVAL5980 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
4. 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 2009 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 Singapore Spain Sweden Switzerland United Kingdom United States of America www st com 6 6
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ST EVAL5980 0.7 A step down switching regulator demonstration board based on the L5980 handbook