AP65455 Datasheet | Diodes Incorporated

4A, 18V, 650k Hz ADAPTIVE COT STEP-DOWN CONVERTER Description The AP65455 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. Pin Assignments ( Top View ) 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 on-time control supports seamless transition between continuous conduction mode (CCM) at higher load conditions and discontinuous conduction mode (DCM) at lighter load conditions. EN 1 FB 2 VREG5 3 SS 4 PG 5 Exposed Pad 11 PGND 10 VIN 9 VIN 8 BST 7 SW 6 SW DCM allows AP65455 to maintain high efficiency at light load conditions. The AP65455 also Features power good, programmable soft-start, UVLO, OTP, OVP and OCP to protect the circuit. U-DFN3030-10 This IC is available in U-DFN3030-10 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 - Power Good Indicator - 4A Continuous Output Current - 650k Hz Switching Frequency - Built-In Over-Current Limit - Built-In Over-Voltage Protection - Built-In Thermal Shutdown Protection - Programmable Soft-Start - Pre-biased Start-Up - Totally Lead-Free & Fully Ro HS pliant (Notes 1 &...