ver: 2.0 apr 14, 2009 tel: 886-3-5788833 http://www.gmt.com.tw 1 g2995 global mixed-mode technology inc. ddr termination regulator features ? operation supply voltage: 1.6v to 5.5v ? low supply current: 280 a @ 2.5v ? low output offset ? source and sink current ? low external component count ? no inductor required ? no external resistors required ? thermal shutdown protection ? sop-8 with power-pad package applications ? ddr-sdram termination voltage ? ddr-i / ddr-ii termination voltage ? sstl-2 ? sstl-3 general description the g2995 is a linear regulator designed to meet the jedec sstl-2 and sstl-3 (series stub termination logic) specifications for termination of ddr-sdram. it contains a high-speed operational amplifier that pro- vides excellent response to the load transients. this device can deliver 1.5a continuous current and tran- sient peaks up to 3a in the application as required for ddr-sdram termination. with an independent v sense pin, the g2995 can provide superior load regulation. the g2995 provides a v ref output as the reference for the applications of the chipset and dimms. the g2995 can easily provide the accurate v tt and v ref voltages without external resistors that pcb ar- eas can be reduced. the quiescent current is as low as 280 a @ 2.5v. so the power consumption can meet the low power consumption applications. ordering information order number (pb free/green) marking temp. range package g2995p1uf g2995 -40 c to 85 c sop-8 g2995f1uf g2995 -40 c to 85 c sop-8 (fd) note: p1:sop-8 f1:sop-8(fd) u: tape & reel (fd): thermal pad pin configuration typical application circuit vref vsense 8 6 5 1 2 3 4 sop-8 (fd) g2995 7 nc gnd vtt pvin avin vddq thermal pad vref vsense 8 6 5 1 2 3 4 sop-8 g2995 7 nc gnd vtt pvin avin vddq + + v ref v ddq av in v sense pv in v tt gnd v tt =1.25v v ref =1.25v v ddq =2.5v 220 f 0.01 f v dd =2.5v v dd =2.5v note: recommend connecting the thermal pad to the ground for excellent power dissipation. vref vsense 8 6 5 1 2 3 4 sop-8 (fd) g2995 7 nc gnd vtt pvin avin vddq thermal pad vref vsense 8 6 5 1 2 3 4 sop-8 g2995 7 nc gnd vtt pvin avin vddq + + v ref v ddq av in v sense pv in v tt gnd v tt =1.25v v ref =1.25v v ddq =2.5v 220 f 0.01 f v dd =2.5v v dd =2.5v note: recommend connecting the thermal pad to the ground for excellent power dissipation.
ver: 3.0 jul 06, 2009 tel: 886-3-578883 3 http://www.gmt.com.t w 1 g2996 global mixed-mode technology inc. ddr i/ii termination regulator features ? operation supply voltage: 1.6v to 5.5v ? low supply current: 280 a @ 2.5v ? low output offset ? source and sink current ? low external component count ? no inductor required ? no external resistors required ? thermal shutdown protection ? suspend to ram (str) function ? sop-8 with power-pad package applications ? ddr-sdram termination voltage ? ddr-i / ddr-ii termination voltage ? sstl-2 ? sstl-3 general description the g2996 is a linear regulator designed to meet the jedec sstl-18, sstl-2 and sstl-3 (series stub termination logic) specifications for termination of ddr-sdram. it contains a high-speed operational amplifier that provides excellent response to the load transients. this device can deliver 1.5a/0.9a continu- ous current and transient peaks up to 3a/1.8a in the application as required for ddri/ii-sdram termination. with an independent v sense pin, the g2996 can provide superior load regulation. the g2996 provides a v ref output as the reference for the applications of the chip- set and dimms. the g2996 can easily provide the accurate v tt and v ref voltages without external resistors that pcb areas can be reduced. the quiescent current is as low as 280 a @ 2.5v. so the power consumption can meet the low power consumption applications. the g2996 also has an active low shutdown ( sd ) pin that provides suspend to ram (str) functionality. when sd is pulled low, the v tt output will be tri-state providing a high impendence, but v ref will remain ac- tive. a power saving advantage can be obtained in this mode through lowering the quiescent current to180 a @ 2.5v. ordering information order number (pb free/green) marking temp. range package g2996f1uf g2996 -40 c to 85 c sop-8 (fd) note: f1:sop-8(fd) u: tape & reel (fd): thermal pad pin configuration typical application circuit + + sd v ref v ddq av in v sense pv in v tt gnd v tt =1.25v v ref =1.25v v ddq =2.5v sd 220 f 0.01 f vsense 8 6 5 1 2 3 4 sd gnd vtt pvin avin vddq sop-8(fd) g2996 7 vref thermal pad note: recommend connecting the thermal pad to the gnd for excellent power dissipation. v dd =2.5v v dd =2.5v + + sd v ref v ddq av in v sense pv in v tt gnd v tt =1.25v v ref =1.25v v ddq =2.5v sd 220 f 0.01 f vsense 8 6 5 1 2 3 4 sd gnd vtt pvin avin vddq sop-8(fd) g2996 7 vref thermal pad note: recommend connecting the thermal pad to the gnd for excellent power dissipation. v dd =2.5v v dd =2.5v
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