data brief for further information contact your local stmicroelectronics sales office. march 2008 rev 1 1/4 4 STEVAL-ISA051V2 complete ddr2/3 memory power supply controller evaluation board based on the pm6670as features 4.5 v to 36 v input voltage range 0.9 v, 1% voltage reference 1.8 v (ddr2) or 1.5 v (ddr3) fixed output voltages 0.9 v to 2.6 v adjustable output voltage 1.237 v 1% reference voltage available very fast load transient response using constant on-time loop control no r sense current sensing using the r ds(on) of the low-side mosfets negative current limit latched ovp, uvp and thermal shutdown fixed 3 ms soft-start selectable pulse-skipping at light load selectable no-audible (33 khz) pulse-skip mode all ceramic output capacitors application supported output voltage ripple compensation description this evaluation board based on the pm6670as device is a complete ddr2/3 power supply regulator for portable applications designed to meet jedec specifications. it integrates a constant on-time (cot) buck controller, a 2 apk sink/source low dropout regulator and a 15 ma low noise buffered reference. the cot architecture assures fast transient response supporting both polymeric and ceramic output capacitors. an embedded integrator control loop compensates the dc voltage error due to the output ripple. the 2 apk sink/source linear regulator provides the memory termination voltage with fast load transient response. the device is fully comp liant with system sleep states s3 and s4/s5, providing ldo output high impedance in suspend-to-ram and tracking discharge of all outputs in suspend-to-disk. STEVAL-ISA051V2 www.st.com obsolete product(s) - obsolete product(s)
circuit schematic STEVAL-ISA051V2 2/4 1 circuit schematic figure 1. schematic 0 0 1 j 2 v dd d d q 1 j 3 p g n d 1 j 1 1 a g n d 1 j 1 v i n 1 j 5 v c c j p 3 m o d e 0 0 0 v t t 2 4 l d o i n 2 3 b o o t 2 2 h g a t e 2 1 p h ase a s e 2 0 c s n s 1 9 v c c 1 8 l g a t e 1 7 p g n d 1 6 pg p g 1 5 s 3 1 4 s 5 1 3 d s c g 1 2 c o m p 1 1 m o d e 1 0 vs v s n s 9 v o sc s c 8 v r ef e f 7 a v c c 6 s g n d 5 v t t r ef e f 4 ddr d d r sel s e l 3 v t t s n s 2 v t t g n d 1 t h pd p d 2 5 u 1 p m 66 6 6 7 0 as a s 1 j 9 v cc c c g n d 5 4 1 6 7 8 2 3 q 2 s t s 7 n f 6 0 l 5 4 1 6 7 8 2 3 q 1 s t s 5 n f 60 6 0 l 1 j 1 0 a g n d 1 j 6 l d o i n 2 1 d 1 ba b a t 4 1 j 1 2 r 4 3 r 3 0 1 2 r 3 1 k 5 1 2 r 1 33 3 3 0 k 1 2 r 2 18 1 8 k 1 2 l 1 1 u 2 1 d 2 s t ps p s 1l 1 l 6 0 a 1 2 c 1 1 0 u 1 2 c 2 1 0 u 2 1 d 3 s t ps p s 1l 1 l 6 0 a 1 2 c 3 2 20 2 0 u 1 2 c 4 2 20 2 0 u 1 2 c 1 0 1 2 c 9 10 1 0 0 n 1 2 r 7 3 r 9 0 1 2 c 2 1 100 1 0 0 p 1 2 c 1 9 1 0 u 1 2 c 1 3 1 00 0 0 n 1 2 c 2 0 1 0 u 1 2 4 3 s w 1 1 2 r 1 1 10 1 0 0 k 1 2 r 1 2 10 1 0 0 k 1 2 c 2 2 1 0 0 p 0 r 1 4 7 . 5 k r 1 5 6 . 8 k 1 2 c 1 5 4 7 n 1 2 c 1 6 6 80 8 0 p 1 2 c 1 7 0 1 2 c 6 10 1 0 u r 1 7 0 v c c v c c v c c v c c 1 2 c 1 1 1 0 u 0 1 2 c 8 3 3 n 1 2 c 1 4 1 00 0 0 n t p 1 g nd n d _ t p 1 j 4 pg p g 1 2 r 1 3 10 1 0 0 k 0 1 2 c 5 1 u j p 5 i n t _ c e r 1 2 3 4 5 6 j p2 p 2 d s c g 1 2 3 4 5 6 j p 1 d dr d r s e l 0 0 0 1 2 c 7 10 1 0 u 0 0 r 8 27 2 7 k r 9 18 1 8 k r 6 0 r 1 0 0 1 2 c 1 2 1 0 0 n 1 j 7 v t t 1 j 8 v tt t t r ef e f 1 2 c 1 8 1 n r 1 6 4 r 7 0 0 obsolete product(s) - obsolete product(s)
STEVAL-ISA051V2 revision history 3/4 2 revision history table 1. document revision history date revision changes 03-mar-2008 1 initial release. obsolete product(s) - obsolete product(s)
STEVAL-ISA051V2 4/4 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, an y 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. ? 2008 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 - singapore - spain - sweden - switzerland - united kingdom - united states of america www.st.com obsolete product(s) - obsolete product(s)
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