AP65453 Datasheet | Diodes Incorporated

ADVANCED INFORMATION 4A, 18V, 650k Hz ADAPTIVE COT STEP-DOWN CONVERTER Description The AP65453 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 TVs and monitors. 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 SP-CAP or POSCAP and ultra-low ESR ceramic capacitors. The adaptive, constant on-time control supports seamless transition between continuous conduction mode (CCM) at higher load conditions and discontinuous conduction mode (DCM) at lighter load conditions. Pin Assignments ( Top View ) EN 1 FB 2 VREG5 3 SS 4 8 VIN 7 BS 6 SW 5 GND SO-8EP DCM allows AP65453 to maintain high efficiency at light load conditions. The AP65453 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: 90mΩ Internal High-side Switch and 57mΩ 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 - Gaming...