ver: 0.4 jan 16, 2013 tel: 886-3-5788833 http://www.gmt.com.tw 1 G2987 global mixed-mode technology ddr termination regulator features ? 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 ? vcntl supply voltage: 3v to 5.5v ? termination supply voltage : 1.2v to 3.6v ? stable with output ceramic capacitor ? over current protection ? thermal shutdown protection ? shutdown function for str (s3) mode ? adjustable output voltage with resistors ? built-in soft-start ? power mos integrated ? sop-8 (fd) and msop-8 (fd) package ? rohs compliant applications ? ddr i/ii/iii/iiil/iv memory termination ? sstl_3, sstl_2, sstl_18, sstl_15 ? notebook/desktop/server ? telecom/datacom, gsm base station, lcd-tv/pdp-tv, copier/printer, set-top box general description the G2987 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 pro- vides accurate and fast response with up to 1.8a source/sink ability in load transient to track reference voltage. the terminated voltage can be generated by two external resistors or programmed by forcing vref pin at a desired voltage. also the G2987 operate in low power consumption as low as 0.7ma and it has a shutdown function by setting vref lower than 0.15v then the vtt is turned off and discharged via an in- ternal mosfet. this function obtains low quiescent current as 50 a for str mode. ordering information order number marking temp. range package (green) G2987f11u G2987 -40 c~85 c sop-8 (fd) G2987f51u G2987 -40 c~85 c msop-8 (fd) note: f1: sop-8 (fd) f5: msop-8 (fd) 1: bonding code u : tape & reel pin configuration c out r dummy r tt c in c cntl c ss r 2 r 1 vin vcntl vref gnd vout en v cntl =3.3v v in =2.5v 2n7002 ddr i c out r dummy r tt c in c cntl c ss r 2 r 1 vin vcntl vref gnd vout en v cntl =3.3v v in =1.8v 2n7002 c out r dummy r tt c in c cntl c ss r 2 r 1 vin vcntl vref gnd vout en v cntl =3.3v v in =1.5v 2n7002 ddr ii ddr iii* * recommended v ctrl =3.3v vout vref 8 6 5 1 2 3 4 sop-8 (fd)/msop-8 (fd) G2987 7 vin gnd nc nc vcntl nc thermal pad typical application circuit note: recommend connecting the thermal pad to the ground for excellent power dissipation. v tt v tt v tt c out r dummy r tt c in c cntl c ss r 2 r 1 vin vcntl vref gnd vout en v cntl =3.3v v in =2.5v 2n7002 ddr i c out r dummy r tt c in c cntl c ss r 2 r 1 vin vcntl vref gnd vout en v cntl =3.3v v in =1.8v 2n7002 c out r dummy r tt c in c cntl c ss r 2 r 1 vin vcntl vref gnd vout en v cntl =3.3v v in =1.5v 2n7002 ddr ii ddr iii* * recommended v ctrl =3.3v vout vref 8 6 5 1 2 3 4 sop-8 (fd)/msop-8 (fd) G2987 7 vin gnd nc nc vcntl nc thermal pad typical application circuit note: recommend connecting the thermal pad to the ground for excellent power dissipation. v tt v tt v tt
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