ver: 1.4 feb 11, 2010 tel: 886-3-5788833 http://www.gmt.com.tw 1 G5601A global mixed-mode technology inc. high-speed step-down controller with ldo con- troller for notebook computer features --pwm controller ? ultra-high efficiency ? no current-sense resistor (lossless i limit ) ? quasi-pwm with 100ns load-step response ? 1% vout accuracy over line and load ? 0.75v to 3.6v adjustable output range ? 4.5v to 24v battery input range ? ovp & uvp ? 1.7ms soft-start ? drives large synchronous-rectifier fets ? power-good indicator --ldo controller ? 1.5% accuracy over line and load ? adjustable output down to 0.75v ? independent enable and power good indicator ? drives n-channel mosfet within rail to rail controller voltage ? mlcc and poscap stable applications ? notebook computers ? cpu core supply ? chipset/ram supply as low as 0.75v ? 1.8v and 2.5v i/o supply ? networking power supply general description G5601A 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 G5601A 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. alternatively, two-stage con- version (stepping down the +5v system supply instead of the battery) at a higher switching frequency allows the minimum possible physical size. the G5601A is intended for cpu core, chipset, dram, or other low-voltage supplies as low as 0.75v. G5601A ldo controller can drive an external nmosfet to provide a second output voltage from pwm output or other power source. it is adjusted output from 0.75v. the independent enable input, open-drain power good in- dicator, under-voltage protection and soft-start are provided for system application. the G5601A is available in 16-pin tqfn (3x3) package. ordering information order number marking temp. range package (green) G5601Ar41u 5601a -40 c to +85 c tqfn3x3-16 note:r4:tqfn3x3-16 1: bonding code u : tape & reel pin configuration G5601A tqfn3x3-16 ldrv 1 2 3 4 12 11 10 9 dh lx il im vdd 16 15 14 13 dl lp g lfb thermal pad len bs t en_s kip ton out vcc fb pg oo d 5 6 7 8 17 g nd G5601A tqfn3x3-16 ldrv 1 2 3 4 12 11 10 9 dh lx il im vdd 16 15 14 13 dl lp g lfb thermal pad len bs t en_s kip ton out vcc fb pg oo d 5 6 7 8 17 g nd
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