ver:1.0 aug 29, 2011 tel: 886-3-5788833 http://www.gmt.com.tw 1 G5602 global mixed-mode technology 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 G5602 uses constant on-time control scheme to han- dle wide input/output voltage ratios with ease and pr o- vides 100ns instant-on response to load transients while maintaining a relatively constant switching fre - quency. the G5602 achieves high efficiency at a re- duced cost by eliminating the current-sense resisto r 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 eff i- ciency. alternatively, two-stage conversion (steppin g down the +5v system supply instead of the battery) a t a higher switching frequency allows the minimum pos- sible physical size. the G5602 is intended for cpu core, chipset, dram, or other low-voltage supplies as low as 0.75v. the G5602 is available in 16-pin tqfn 3x3 and ssop-16 package and includes over voltage protection. ordering information order number marking temp. range package (green) G5602r41u 5602 -40 c to +85 c tqfn3x3-16 G5602s11u G5602 -40 c to +85 c ssop-16 note: r4:tqfn3x3-16 s1: ssop-16 1: bonding code u : tape & reel pin configuration G5602 tqfn3x3-16 pgnd 12 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 56 7 8 fb 1 23 4 5 6 7 8 en_skip out vcc pgood agnd lx ilim vdd dl pgnd ssop-16 bst G5602 16 15 14 13 12 11 10 9 nc dh nc ton note: recommend connecting the thermal pad to the ground for excellent power dissipation. G5602 tqfn3x3-16 pgnd 12 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 56 7 8 G5602 tqfn3x3-16 pgnd 12 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 56 7 8 fb 1 23 4 5 6 7 8 en_skip out vcc pgood agnd lx ilim vdd dl pgnd ssop-16 bst G5602 16 15 14 13 12 11 10 9 nc dh nc ton note: recommend connecting the thermal pad to the ground for excellent power dissipation.
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