ver: 0.92 mar 25, 2011 tel: 886-3-5788833 http://www.gmt.com.tw 1 G5603 global mixed-mode technology inc. high-speed step-down controller features ? 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 ? integrated boost diode ? ovp & uvp ? 1.7ms soft-start ? drives large synchronous-rectifier fets ? power-good indicator applications ? notebook computers ? cpu core supply ? i/o supply ? chipset/ram supply as low as 0.75v ? networking power supply general description G5603 uses constant on-time control scheme to han- dle wide input/output voltage ratios with ease and pro- vides 100ns ? instant-on ? response to load transients while maintaining a relatively constant switching fre- quency. the G5603 achieves high efficiency at a re- duced cost by eliminating the current-sense resistor found in traditional current-mode pwms. efficiency is further enhanced by an ability to drive very large syn- chronous rectifier mosfets. single-stage buck con- version allows these devices to directly step down high-voltage batteries for the highest possible effi- ciency. alternatively, two-stage conversion (stepping down the +5v system supply instead of the battery) at a higher switching frequency allows the minimum pos- sible physical size. the G5603 is intended for cpu core, chipset, dram, or other low-voltage supplies as low as 0.75v. the G5603 is available in tssop-14 tqfn3x3-16 and tqfn3.5x3.5-14 package and in- cludes over voltage protection. ordering information order number marking temp. range package (green) G5603d21u G5603 -40 c to +85 c tssop-14 G5603r41u 5603 -40 c to +85 c tqfn3x3-16 G5603ru1u 5603 -40 c to +85 c tqfn3.5x3.5-14 note: d2: tssop-14 ru: tqfn3.5x3.5-14 r4: tqfn3x3-16 1: bonding code u : tape & reel pin configuration 1 2 3 4 5 6 7 en_skip ton tssop-14 G5603 14 13 12 11 10 9 8 out vcc fb pgood agnd pgnd dl vdd ilim lx dh bst G5603 tqfn3.5x3.5-14 14 17 8 4 3 5 6 2 bst ton out fb agnd pgnd 9 10 11 13 12 vdd dl ilim lx dh vcc pgood thermal pad en_skip note: recommend connecting the thermal pad to the ground for excellent power dissipation. G5603 tqfn3x3-16 pgnd 1 2 3 4 12 11 10 9 dh lx ilim vdd 16 15 14 13 dl nc agnd thermal pad nc bst en_skip ton out vcc fb pgood 5 6 7 8 1 2 3 4 5 6 7 en_skip ton tssop-14 G5603 14 13 12 11 10 9 8 out vcc fb pgood agnd pgnd dl vdd ilim lx dh bst G5603 tqfn3.5x3.5-14 14 17 8 4 3 5 6 2 bst ton out fb agnd pgnd 9 10 11 13 12 vdd dl ilim lx dh vcc pgood thermal pad en_skip G5603 tqfn3.5x3.5-14 14 17 8 4 3 5 6 2 bst ton out fb agnd pgnd 9 10 11 13 12 vdd dl ilim lx dh 9 10 11 13 12 vdd dl ilim lx dh vcc pgood thermal pad en_skip note: recommend connecting the thermal pad to the ground for excellent power dissipation. G5603 tqfn3x3-16 pgnd 1 2 3 4 12 11 10 9 dh lx ilim vdd 16 15 14 13 dl nc agnd thermal pad nc bst en_skip ton out vcc fb pgood 5 6 7 8 G5603 tqfn3x3-16 pgnd 1 2 3 4 12 11 10 9 dh lx ilim vdd 16 15 14 13 dl nc agnd thermal pad nc bst en_skip ton out vcc fb pgood 5 6 7 8
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