AP65550

AP65550 5A, 18V, 650kHz ADAPTIVE COT STEP-DOWN CONVERTER Description The AP65550 is an adaptive constant on-time mode synchronous buck converter providing high efficiency, excellent transient response and high DC output accuracy for low-voltage regulation in digital TV and monitor. The constant-on-time control scheme handles wide input/output voltage ratios and provides low external component count. The internal proprietary circuit enables the device to adopt both low equivalent series resistance (ESR) output capacitors, such as SPCAP or POSCAP and ultra-low ESR ceramic capacitors. The adaptive on-time control supports seamless transition between continuous conduction mode (CCM) at higher load conditions and discontinuous conduction mode (DCM) at lighter load conditions. DCM allows AP65550 maintain high efficiency at light load conditions. The AP65550 also features programmable soft-start, UVLO, OTP and OCP to protect the circuit. This IC is available in SO-8EP package. Pin Assignments ( Top View ) EN FB VREG5 SS 1 2 3 4 8 7 6 5 VIN BS SW GND SO-8EP Features               Fixed Frequency Emulated Constant On-time Control Good Stability Independent of the Output Capacitor ESR Fast Load Transient Response Synchronous Rectification: 65mΩ Internal High-side Switch and 36mΩ Internal Low-side Switch Wide Input Voltage Range: 4.5V to 18V Output Voltage Range: 0.76V to 6V 5A Continuous Output Current 650kHz Switching Frequency Built-in Over Current Limit Built-in T...