AP65454

NOT RECOMMENDED FOR NEW DESIGN USE AP65450 AP65454 4A, 18V, 650kHz ADAPTIVE COT STEP-DOWN CONVERTER Description The AP65454 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 component count. The internal proprietary circuit enables the device to adopt both low equivalent series resistance (ESR) output capacitors, such as SP-CAP or POSCAP as well as ultra-low ESR ceramic capacitors. The AP65454 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 1 FB 2 VREG5 3 SS 4 8 7 6 5 SO-8EP VIN BS SW GND AP65454 operates in continuous conduction mode (CCM) in light-load conditions for better EMI performance. AP65453 and AP65455 are the options for light-load efficiency enhancement. 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  650kHz Switching Frequency  Built-in Overcurrent Limit  Built-in Thermal Shutdown Protection  P...