ver: 1.5 oct 26, 2012 tel: 886-3-5788833 http://www.gmt.com.tw 1 G5616 global mixed-mode technology complete ddr, ddrii and ddriii memory solution synchronous buck pwm controller, 3a ldo, buffered reference features ? synchronous buck controller (vddq) ? ultra-high efficiency ? no current-sense resistor (lossless i limit ) ? quasi-pwm with 100ns load-step response ? 1.8v(ddrii) /1.5v(ddriii) fixed or adjustable to 2.5v(ddr) or 0.75v to 3.6v adjustable out- put range ? 2v to 24v battery input range ? 400khz switching frequency ? ovp & uvp of vddq output ? drives large synchronous-rectifier fets ? power-good indicator ? 3-a ldo (vtt), buffered reference (vttref) ? support ddr (1.25 vtt) , ddr ii (0.9 vtt) and ddriii(0.75 vtt) requirements ? vldoin voltage range: 1.2v to 3.6v ? requires only 20 f ceramic vtt output ca- pacitance ? 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 to reduce the vldoin surg- ing current ? over current protection of vtt output ? thermal shutdown protection applications ? notebook computers ? cpu core supply ? chipset/ram supply as low as 0.75v ? 1.8v and 2.5v i/o supply general description the G5616 is intended for ddr/sstl-2, d- drii/sstl-18 and ddriii memory systems. it inte- grates a synchronous buck pwm controller with a 3-a sink-source linear regulator and buffered reference. the pwm controller uses constant on-time control scheme to handle wide input/output voltage ratios with ease and provides 100ns ? instant-on ? response to load transients while maintaining a relatively constant switching frequency. the G5616 achieves high effi- ciency at a reduced cost by eliminating the cur- rent-sense resistor found in traditional current-mode pwms. efficiency is further enhanced by an ability to drive very large synchronous rectifier mosfets. sin- gle-stage buck conversion allows these devices to directly step down high-voltage batteries for the high- est possible efficiency. the 3a sink/source tracking termination regulator is specifically designed for low-cost/ low-external com- ponent count systems. the regulator contains a high speed operational amplifier that provides fast load transient response with only 20 f (2x10 f) of ceramic output capacitance. the G5616 supports remote sensing functions and all features required to power the ddr /ddrii /ddriii vtt bus termination accord- ing to the jedec specification. in addition, the G5616 includes integrated sleep-state controls placing vtt in high-z in s3 (suspend to ram) and soft-off for vtt and vttref in s5 (shutdown). the G5616 provides ovp, uvp, over current and thermal shutdown protection functions and is available in a 20-pin 3x3 tqfn package and 24-pin 4x4 tqfn includes over voltage protection. ordering information order number marking temp. range package (green) G5616rz1u 5616 -40 c to +85 c tqfn3x3-20 G5616r51u 5616 -40 c to +85 c tqfn4x4-24 note: rz: tqfn3x3-20 r5: tqfn4x4-24 1: bonding code u : tape & reel
ver: 1.5 oct 26, 2012 tel: 886-3-5788833 http://www.gmt.com.tw 2 G5616 global mixed-mode technology pin configuration note: recommend connecting the thermal pad to the ground for excellent power dissipation. G5616 tqfn4x4-24 vttgnd vttsns gnd mode vttref nc pgnd nc cs vpp vcc pgood 1 2 3 4 5 6 13 14 15 16 17 18 24 19 21 23 22 nc 8 7 9 10 11 12 thermal pad s5 s3 vddqset vddqsns nc dl lx dh bst vldoin vtt 20 G5616 tqfn3x3-20 1 2 3 4 5 11 12 13 14 15 16 17 18 20 19 8 7 9 10 thermal pad 6 vttgnd vttsns gnd mode vttref s5 s3 vddqset vddqsns pgnd cs vpp vcc pgood dl lx dh bst vldoin vtt note: recommend connecting the thermal pad to the ground for excellent power dissipation. G5616 tqfn4x4-24 vttgnd vttsns gnd mode vttref nc pgnd nc cs vpp vcc pgood 1 2 3 4 5 6 13 14 15 16 17 18 24 19 21 23 22 nc 8 7 9 10 11 12 thermal pad s5 s3 vddqset vddqsns nc dl lx dh bst vldoin vtt 20 G5616 tqfn3x3-20 1 2 3 4 5 11 12 13 14 15 16 17 18 20 19 8 7 9 10 thermal pad 6 vttgnd vttsns gnd mode vttref s5 s3 vddqset vddqsns pgnd cs vpp vcc pgood dl lx dh bst vldoin vtt
ver: 1.0 oct 26, 2012 tel: 886-3-5788833 http://www.gmt.com.tw 1 G5616a global mixed-mode technology complete ddr, ddrii and ddriii memory solution synchronous buck pwm controller, 2a ldo, buffered reference features ? synchronous buck controller (vddq) ? ultra-high efficiency ? no current-sense resistor (lossless i limit ) ? quasi-pwm with 100ns load-step response ? 1.8v(ddrii) /1.5v(ddriii) fixed or 0.75v to 3.6v adjustable output range ? 2v to 28v battery input range ? programmable switching frequency ? ovp & uvp of vddq output ? drives large synchronous-rectifier fets ? power-good indicator ? 2-a ldo (vtt), buffered reference (vttref) ? support ddr (1.25 vtt) , ddr ii (0.9 vtt) and ddriii(0.75 vtt) requirements ? vldoin voltage range: 1.2v to 3.6v ? requires only 20 f ceramic vtt output ca- pacitance ? 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 to reduce the vldoin surg- ing current ? over current protection of vtt output ? thermal shutdown protection applications ? notebook computers ? cpu core supply ? chipset/ram supply as low as 0.75v ? 1.8v and 2.5v i/o supply general description the G5616a is intended for ddr/sstl-2, ddrii/sstl-18 and ddriii memory systems. it inte- grates a synchronous buck pwm controller with a 2a sink-source linear regulator and buffered reference. the pwm controller uses constant on-time control scheme to handle wide input/output voltage ratios with ease and provides 100ns ? instant-on ? response to load transients while maintaining a relatively constant switching frequency. the G5616a achieves high effi- ciency at a reduced cost by eliminating the cur- rent-sense resistor found in traditional current-mode pwms. efficiency is further enhanced by an ability to drive very large synchronous rectifier mosfets. sin- gle-stage buck conversion allows these devices to directly step down high-voltage batteries for the high- est possible efficiency. the 2a sink/source tracking termination regulator is specifically designed for low-cost/ low-external com- ponent count systems. the regulator contains a high speed operational amplifier that provides fast load transient response with only 20 f (2x10 f) of ceramic output capacitance. the G5616a supports remote sensing functions and all features required to power the ddr /ddrii /ddriii vtt bus termination accord- ing to the jedec specification. in addition, the G5616a includes integrated sleep-state controls plac- ing vtt in high-z in s3 (suspend to ram) and soft-off for vtt and vttref in s5 (shutdown). the G5616a provides ovp, uvp, over current and thermal shutdown protection functions and is available in a 20-pin 3x3 tqfn package and 24-pin 4x4 tqfn includes over voltage protection. ordering information order number marking temp. range package (green) G5616arz1u 5616a -40 c to +85 c tqfn3x3-20 G5616ar51u 5616a -40 c to +85 c tqfn4x4-24 note: rz: tqfn3x3-20 r5: tqfn4x4-24 1: bonding code u : tape & reel
ver: 1.0 oct 26, 2012 tel: 886-3-5788833 http://www.gmt.com.tw 2 G5616a global mixed-mode technology pin configuration note: recommend connecting the thermal pad to the ground for excellent power dissipation. G5616a tqfn4x4-24 vttgnd vttsns gnd mode vttref nc pgnd nc cs vpp vcc pgood 1 2 3 4 5 6 13 14 15 16 17 18 24 19 21 23 22 ton 8 7 9 10 11 12 thermal pad s5 s3 vddqset vddqsns nc dl lx dh bst vldoin vtt 20 G5616a tqfn3x3-20 1 2 3 4 5 11 12 13 14 15 16 17 18 20 19 8 7 9 10 thermal pad 6 vttgnd vttsns gnd vttref vddqsns ton s5 s3 vddqset pgnd cs vpp vcc pgood dl lx dh bst vldoin vtt note: recommend connecting the thermal pad to the ground for excellent power dissipation. G5616a tqfn4x4-24 vttgnd vttsns gnd mode vttref nc pgnd nc cs vpp vcc pgood 1 2 3 4 5 6 13 14 15 16 17 18 24 19 21 23 22 ton 8 7 9 10 11 12 thermal pad s5 s3 vddqset vddqsns nc dl lx dh bst vldoin vtt 20 G5616a tqfn3x3-20 1 2 3 4 5 11 12 13 14 15 16 17 18 20 19 8 7 9 10 thermal pad 6 vttgnd vttsns gnd vttref vddqsns ton s5 s3 vddqset pgnd cs vpp vcc pgood dl lx dh bst vldoin vtt
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