ver: 1.4 jul 18, 2011 tel: 886-3-5788833 http://www.gmt.com.tw 1 G5207 global mixed-mode technology inc. 24v input voltage-mode buck pwm controller features drives two n-channel mosfets operates at 5v supply voltage voltage-mode pwm control fast transient response 0.8v, 2% accuracy reference voltage internal soft start constant 300khz switching frequency over-current fault monitors by using low-side mosfet r ds(on) output under-voltage protection applications 16v to 30v input high power dc-dc regulators low-voltage distributed power supplies general description the G5207 provides complete control and protection for a dc-dc converter for high power applications. it is designed to drive two n-channel mosfets in a synchronous-rectified buck topology. the G5207 inte - grates all of the control, and protection functions into a single package. the G5207 provides simple, single feedback loop, voltage-mode control with fast transient response. i t includes a 300khz free-running triangle-wave oscilla- tor. the error amplifier features a 15mhz gain-band- width product which provides high converter band- width for fast transient performance. the resulting pwm duty ratio ranges from 0% to 80%. the refer- ence voltage is 0.8v, 2% accuracy. the G5207 has internal soft start and executes cy- cle-by-cycle current limit during soft start interv al. the G5207 monitors the current by using the r ds(on) of the low-side mosfet which eliminates the need for a current sensing resistor. the under-voltage protect ion function monitors voltage at fb pin. the over-curre nt and under-voltage events after soft-start interval trig- ger hiccup mode protection. ordering information order number marking temp. range package (green) G5207p11u G5207 -40 c~ +85 c sop-8 note: p1: sop-8 1: bonding code u: tape & reel pin configuration typical application circuit gnd 8 6 5 1 2 3 4 boot ugate lgate lx ocset fb vcc sop-8 G5207 7 boot shdn ugate 6 h ocset fb lgate gnd vcc 5v G5207 0.1 f 2000 f 10nf 10 w 4.7 f 220 f 620 w 39 w 16~30v r ocset lx v o =13.5v gnd 8 6 5 1 2 3 4 boot ugate lgate lx ocset fb vcc sop-8 G5207 7 boot shdn ugate 6 h ocset fb lgate gnd vcc 5v G5207 0.1 f 2000 f 10nf 10 w 4.7 f 220 f 620 w 39 w 16~30v r ocset lx v o =13.5v
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