ver: 0.8 apr 15, 2013 tel: 886-3-5788833 http://www.gmt.com.tw 1 G5318 global mixed-mode technology high-speed step-down controller features ? ultra-high efficiency ? 4700ppm/ c r ds(on) current sensing ( without current-sense resistor ) ? quasi-pwm with 100ns load-step response ? built-in 0.5% 0.7v reference ? 0.7v to 2.6v adjustable output range ? 4.5v to 28v battery input range ? 4 selectable frequency setting ? integrated boost switch ? ovp & uvp ? 1.5ms voltage servo soft-start ? drives large synchronous-rectifier fets ? power-good indicator ? thermal shutdown (non-latch) applications ? notebook computers ? cpu core supply ? i/o supply ? chipset/ram supply as low as 0.7v general description G5318 is a small-sized step-down controller uses con- stant on-time control scheme to handle wide in- put/output voltage ratios with ease and provides 100ns ? instant-on ? response to load transients while main- taining a relatively constant switching frequency. the G5318 achieves high efficiency at a reduced cost by eliminating the current-sense resistor found in tradi- tional current-mode pwms. efficiency is further en- hanced by an ability to drive very large synchronous rectifier mosfets. the G5318 is intended for cpu core, chipset, dram, or other low-voltage supplies as low as 0.7v. the G5318 is available in tdfn3x3-10 package. ordering information order number marking temp. range package (green) G5318re1u 5318 -40 c to +85 c tdfn3x3-10 G5318re1d 5318 -40 c to +85 c tdfn3x3-10 note: re: tdfn3x3-10 1: bonding code u & d : tape & reel pin configuration trip pgood en fb lx vcc dh bst tdfn3x3-10 4 G5318 1 2 3 8 7 6 5 9 10 thermal pad rf dl 11 gnd trip pgood en fb lx vcc dh bst tdfn3x3-10 4 G5318 1 2 3 8 7 6 5 9 10 thermal pad rf dl 11 gnd
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