ver: 0.2 aug 28, 2013 tel: 886-3-5788833 http://www.gmt.com.tw 1 g2986 global mixed-mode technology lpddr2/lpddr3 termination regulator features ? support 1.2v lpddr2/lpddr3 and ddr iiil (0.675vtt) requirements ? input voltage range: 3v to 5.5v ? vldoin voltage range: 1.2v to 3.6v ? requires only 20 f ceramic output capaci- tance ? supports high-z in s3 and soft-off in s5 ? integrated divider tracks 1/2 vddqsns for both vtt and vttref ? remote sensing (vttsns) ? 20mv accuracy for vtt and vttref ? 10ma buffered reference (vttref) ? built-in soft-start ? over current protection ? thermal shutdown protection ? tdfn2x2-10 package applications ? ddr iiil memory termination ? lpddr2/lpddr3 memory termination ? sstl ? 2, sstl ? 18 ? hstl termination general description the g2986 is a 3a sink/source tracking termination regulator. it is specifically designed for low-cost/ low-external component count systems. the g2986 maintains a high speed operational amplifier that pro- vides fast load transient response and only requires 20 f (2 10 f) of ceramic output capacitance. the g2986 supports remote sensing functions and all fea- tures required to power the lpddr2 /lpddr3 /ddr iiil vtt bus termination according to the jedec specification. in addition, the g2986 includes inte- grated sleep-state controls placing vtt in high-z in s3 (suspend to ram) and soft-off for vtt and vttref in s5 (shutdown). the g2986 is available in the thermally efficient tdfn2x2-10. ordering information order number marking temp. range package (green) G2986K21U 2986 -40 c~85 c tdfn2x2-10 g2986k21d 2986 -40 c~85 c tdfn2x2-10 note: k2:tdfn 2x2-10 1:bonding code u & d: tape & reel pin configuration typical application circuit s5 vddqsns vldoin pgnd vttsns vtt gnd s3 vin vttref ddr ii lpddrii/lpddriii vddqsns vin vldoin vtt gnd pgnd s3 s5 vin=3.3v 2x10 f vttsns vttref s5 1.2v s3 0.1 f c2 c1 note: recommend connecting the thermal pad to the gnd or let it keep floating. tdfn2x2-10 4 g2986 1 2 3 8 7 6 5 9 10 4 1 2 3 8 7 6 5 9 10 thermal pad (ep) s5 vddqsns vldoin pgnd vttsns vtt gnd s3 vin vttref ddr ii lpddrii/lpddriii vddqsns vin vldoin vtt gnd pgnd s3 s5 vin=3.3v 2x10 f vttsns vttref s5 1.2v s3 0.1 f c2 c1 note: recommend connecting the thermal pad to the gnd or let it keep floating. tdfn2x2-10 4 g2986 1 2 3 8 7 6 5 9 10 4 1 2 3 8 7 6 5 9 10 thermal pad (ep)
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