ver: 0.9 jan 18, 2013 tel: 886-3-5788833 http://www.gmt.com.tw 1 g5316 global mixed-mode technology complete ddr2, ddr3 and ddr3l memory solution synchronous buck pwm controller, 2a ldo, buffered reference features ? synchronous buck controller (vddq) ? ultra-high efficiency at light and heavy load with auto-skip function ? no current-sense resistor (lossless i limit ) ? quasi-pwm with 100ns load-step response ? 0.7v to 1.8v adjustable output range ? 3v to 28v battery input range ? 0.8% vref accuracy ? supports soft-off in s4/s5 states ? selectable 300k/400khz switching frequency ? ovp & uvp of vddq output ? drives large synchronous-rectifier fets ? power-good indicator ? 2-a ldo (vtt), buffered reference (vttref) ? vldoin voltage range: 1.2 v to 3.6 v ? requires only 10 f ceramic vtt output ca- pacitance ? supports high-z in s3 and soft-off in s4/s5 ? integrated divider tracks 1/2 vddqsns for both vtt and vttref ? remote sensing (vttsns) ? 20mv vtt and 0.8% vttref accuracy ? 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 0.7v general description the g5316 is intended for ddr2, ddr3 and ddr3l memory systems. it integrates a synchronous buck pwm controller with a 2-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 g5316 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 10 f of ceramic output capacitance. the g5316 supports remote sensing functions and all features required to power the ddr2 /ddr3 /ddr3l vtt bus termination according to the jedec specification. in addition, the g5316 includes integrated sleep-state controls placing vtt in high-z in s3 (suspend to ram) and soft-off for vtt and vttref in s4/s5 (shutdown). the g5316 provides ovp, uvp, over current and thermal shutdown protection functions and is available in a 20-pin 3x3 tqfn package. ordering information order number marking temp. range package (green) g5316rz1u 5316 -40 c to +85 c tqfn3x3-20 G5316RZ1D 5316 -40 c to +85 c tqfn3x3-20 note: rz: tqfn3x3-20 1: bonding code u & d : tape & reel
ver: 0.9 jan 18, 2013 tel: 886-3-5788833 http://www.gmt.com.tw 2 g5316 global mixed-mode technology pin configuration note: recommend connecting the thermal pad to the ground for excellent power dissipation. g5316 tqfn3x3-20 1 2 3 4 5 11 12 13 14 15 16 17 18 20 19 8 7 9 10 thermal pad 6 vttsns vldoin vtt vttgnd vttref vddqsns refin gnd vref dh lx vcc dl pgnd bst s5 s3 trip mode pgood note: recommend connecting the thermal pad to the ground for excellent power dissipation. g5316 tqfn3x3-20 1 2 3 4 5 11 12 13 14 15 16 17 18 20 19 8 7 9 10 thermal pad 6 vttsns vldoin vtt vttgnd vttref vddqsns refin gnd vref dh lx vcc dl pgnd bst s5 s3 trip mode pgood
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