for further information contact your local stmicroelectronics sales office. october 2014 docid026849 rev 2 1/6 L9912 12 v vehicle network conform car alternator regulator ic data brief features ? system in package smart power alternator regulator and 8-bit microcontroller (non- monolithic approach) ? protected high/low side field pre-driver for external mos ? field short circuit protection ? regulated voltage driven by ecu (programmable protocol driven) ? regulated voltage thermally compensated (without protocol) ? lamp driver (wake up and warning detection) ? 12 v systems ? self start function ? load response control (lrc) ? field monitor (fm) output ? thermal shutdown ? package tqfp44ep 10x10 description the L9912 is a controlled multifunctional alternator regulator intended to be used for commercial and agricultural vehicles. it supports 12 v system. the control can be achieved through different communication protocol: rcv, pcm, c_term, bss. it is a system in package solution with smart power alternator regulator ic and 8-bit microcontroller (non-monolithic approach). it includes the control section, fault diagnostic circuit which drives a warning lamp, and the protection against short circuits. this device regulates in close loop the output of an automotive generator by controlling the field winding current by means of a pulse-width modulation (pwm) of an external high side or low side driver at fixed frequency. tqfp44ep ' ! 0 ' 0 3 www.st.com
application schematics L9912 2/6 docid026849 rev 2 1 application schematics figure 1. low-side configuration 12 v figure 2. high-side configuration 12 v 3 + $ 8 ; b , 1 * $ 7 ( ) % $ & / & * 1 ' ? 3 . ( < $ 8 ; b / 2 $ ' & & & 3 6 ( 1 6 ( ' 5 $ , 1 6 2 8 5 & ( & 6 $ b , 1 5 v h q v h 2 s w l r q d o 9 ' ' b & $ 3 9 b 9 & $ 3 $ / 7 ( 5 1 $ 7 2 5 * $ 3 * 3 6 $ 8 ; b / 2 $ ' . ( < 3 + $ 8 ; b , 1 & 6 $ b , 1 * $ 7 ( ) % $ & / & ? 3 & & & 3 6 ( 1 6 ( ' 5 $ , 1 6 2 8 5 & ( 5 v h q v h 2 s w l r q d o * 1 ' 9 ' ' b & $ 3 9 b 9 & $ 3 $ / 7 ( 5 1 $ 7 2 5 * $ 3 * 3 6
docid026849 rev 2 3/6 L9912 package information 6 2 package information 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. figure 3. tqfp44 exposed pad (10 x 10) mechanical data and package dimensions / 5 4 , ) . % ! . $ - % # ( ! . ) # ! , $ ! 4 ! $ ) - m m i n c h - ) . 4 9 0 - ! 8 - ) . 4 9 0 - ! 8 ! ! ! b c $ $ $ $ % % % % e , , k ? p l q ? w \ s ? p d [ c c c 4 1 & 0
% 8 0 / 3 % $ 0 ! $ " o d y x x m m " ' ! 0 ' 0 3
order codes L9912 4/6 docid026849 rev 2 3 order codes for order go to: http://www.ebv.com/chips table 1. device summary order code package packing L9912 tqfp44ep tube L9912tr tqfp44ep tape & reel
docid026849 rev 2 5/6 L9912 revision history 6 4 revision history table 2. document revision history date revision changes 12-sep-2014 1 initial release. 30-oct-2014 2 changed title in cover page.
L9912 6/6 docid026849 rev 2 important notice ? please read carefully stmicroelectronics nv and its subsidiaries (?st?) reserve the right to make changes, corrections, enhancements, modifications, and improvements to st products and/or to this document at any time without notice. purchasers should obtain the latest relevant in formation on st products before placing orders. st products are sold pursuant to st?s terms and conditions of sale in place at the time of o rder acknowledgement. purchasers are solely responsible for the choice, selection, and use of st products and st assumes no liability for application assistance or the design of purchasers? products. no license, express or implied, to any intellectual property right is granted by st herein. resale of st products with provisions different from the information set forth herein shall void any warranty granted by st for such product. st and the st logo are trademarks of st. all other product or service names are the property of their respective owners. information in this document supersedes and replaces information previously supplied in any prior versions of this document. ? 2014 stmicroelectronics ? all rights reserved
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