ver:1.0 mar 07, 2014 tel: 886-3-5788833 http://www.gmt.com.tw 1 G2985 global mixed-mode technology ddr termination regulator features ? vin input voltage range: 2.5v to 5.5v ? vldoin voltage range: 1.1v to 3.5v ? support ddr i (1.25 v tt ), ddr ii (0.9 v tt ), ddr iii (0.75 v tt ), ddr iiil (0.675v tt ) and ddr iv (0.6 v tt ) requirements ? stable with output ceramic capacitor ? pgood to monitor output regulation ? en input for shutdown function (s3 mode) ? remote sensing (vosns) ? 2a source and sink current ? 25mv accuracy for vtt refers to vttref ? 10ma buffered reference (vttref) ? built-in soft-start and uvlo ? over current protection ? thermal shutdown protection ? tdfn3x3-10 (thermal pad) package applications ? ddr i/ii/iii/iiil/iv memory termination ? sstl_3, sstl_2, sstl_18, sstl_15 ? hstl termination ? notebook/desktop/server ? telecom/datacom, gsm base station, lcd-tv/pdp-tv, copier/printer, set-top box general description the G2985 is a linear regulator designed to meet the jedec sstl (series stub termination logic) speci- fications in ddri/ii/iii/iiil/iv ?sdram systems. it is designed for the system which has low input voltage, low cost, low noise and space consideration. the G2985 provides accurate and fast response with up to 2a source/sink ability in load transient to track reference voltage with typically 20 f output capacitor. the terminated voltage can be generated by two ex- ternal resistors or programmed by forcing refin pin at a desired voltage. also the G2985 provides an open-drain pgood flag which monitors the output regulation and an en signal to discharge vtt during str (s3) mode. ordering information order number marking temp. range package (green) G2985re1d 2985 -40 c~85 c tdfn3x3-10 note: re: tdfn3x3-10 1: bonding code d: tape & reel pin configuration typical application tdfn3x3-10 4 G2985 1 2 3 8 7 6 gnd 5 9 10 pgnd tdfn3x3-10 4 1 2 3 8 7 6 vo refin vldoin vin en 5 9 10 vosns refout thermal pad pgood refin vin en vddq 0.1 f vldoin vo pgnd vosns gnd 1 2 3 4 5 9 G2985 10 pgood 8 7 6 refout slp_s3 vttref vldoin vtt pgood note: recommend connecting the thermal pad to the ground for excellent power dissipation. tdfn3x3-10 4 G2985 1 2 3 8 7 6 gnd 5 9 10 pgnd tdfn3x3-10 4 1 2 3 8 7 6 vo refin vldoin vin en 5 9 10 vosns refout thermal pad pgood refin vin en vddq 0.1 f vldoin vo pgnd vosns gnd 1 2 3 4 5 9 G2985 10 pgood 8 7 6 refout slp_s3 vttref vldoin vtt pgood note: recommend connecting the thermal pad to the ground for excellent power dissipation.
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