AP65450 Datasheet | Diodes Incorporated

NOT REMENDED FOR NEW DESIGN USE AP62400 4A, 18V, 650k Hz ADAPTIVE COT STEP-DOWN CONVERTER Description The AP65450 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 ponent 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. Pin Assignments EN FB VREG5 SS ( Top View ) 18 27 36 45 SO-8EP VIN BS SW GND 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 AP65450 to maintain high efficiency at light load conditions. The AP65450 also Features programmable soft-start, UVLO, OTP and OCP to protect the circuit. This IC is available in SO-8EP package. 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 - 4A Continuous Output Current - 650k Hz Switching Frequency - Built-in Over Current Limit - Built-in Thermal Shutdown Protection - Programmable Soft-start - Pre-biased Start-up - Totally Lead-Free & Fully Ro HS pliant (Notes 1 & 2) - Halogen and Antimony Free. “Green” Device (Note 3) Applications...