G5318

Global Mixed-mode Technology G5318 High-Speed Step-Down Controller Features „ Ultra-High Efficiency „ 4700ppm/°C RDS(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) General Description G5318 is a small-sized step-down 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 G5318 achieves high efficiency at a reduced cost by eliminating the current-sense resistor found in traditional current-mode PWMs. Efficiency is further enhanced by an ability to dr...