data brief for further information contact your local stmicroelectronics sales office. february 2011 doc id 18138 rev 1 1/4 4 STEVAL-ISA076V2 usb compatible battery charge r demo board with integrated power switch for li-ion/li- polymer based on the l6924u features operating input voltage up to 12 v fully integrated soluti on with power mosfet, reverse blocking diode, sense resistor, and thermal control ac adapter or usb mode selection programmable charge current for both ac adapter and usb power sources separately low power/high power se lection in usb mode both linear and quasi-pulse operation 4.2 v preset charge voltage (1 % accuracy) programmable termination current programmable charge timer status outputs to drive leds or host processor interface battery absence detection closed loop thermal control ntc or ptc thermistor interface for battery temperature monitoring and protection rohs compliant description the STEVAL-ISA076V2 demonstration board is based on the l6924u which is a fully monolithic battery charger dedicated to single-cell li- ion/polymer battery packs. it is the ideal solution for space-limited applications, such as pdas, handheld equipment, cellular phones, and digital cameras. when an external voltage regulated adapter or usb port is used, the l6924u works in linear mode, and charges the battery in a constant current/constant voltage (cc/cv) profile. moreover, when a current-limited adapter is used, the device can operate in quasi-pulse mode, dramatically reducing the power dissipation. STEVAL-ISA076V2 www.st.com
schematic diagram STEVAL-ISA076V2 2/4 doc id 18138 rev 1 1 schematic diagram figure 1. schematic ac a d a pter or u s b c1 r6 r5 d2 d1 c4 c 3 j2 j1 c ntc b a ttery s hdn gnd mode i s el v ref th s t1 s t2 v in t prg v out r1 r2 r 3 j 3 j5 j4 c2 r4 rt1 l6924u i end i u s b i ac v o s n s v in s n s v in v in am0 8 551v1
STEVAL-ISA076V2 revision history doc id 18138 rev 1 3/4 2 revision history table 1. document revision history date revision changes 25-feb-2011 1 initial release.
STEVAL-ISA076V2 4/4 doc id 18138 rev 1 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 he rein 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 as sumes 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. i f 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 whatsoev er 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 parti cular 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 milita ry, 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 whatsoev er, 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. ? 2011 stmicroelectronics - all rights reserved stmicroelectronics group of companies australia - belgium - brazil - canada - china - czech republic - finland - france - germany - hong kong - india - israel - ital y - japan - malaysia - malta - morocco - philippines - singapore - spain - sweden - switzerland - united kingdom - united states of america www.st.com
|
