AP65453SP-13

AP65453 4A, 18V, 650kHz ADAPTIVE COT STEP-DOWN CONVERTER Description Pin Assignments ADVANCED INFORMATION 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. ( Top View ) 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 and ultra-low ESR ceramic capacitors. EN 1 8 VIN FB 2 7 BS VREG5 3 6 SW SS 4 5 GND SO-8EP 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. 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 Applications      Gaming Consoles         Flat Screen TV Sets and Monitors Set-Top Boxes Distributed Power Systems Home Audio Consumer Electronics Network Systems FPGA, DSP and ASIC Supplies Green Electronics           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 Over Current Limit Built-in Thermal Shutdown Protection Programmable Soft-start Pre-biased Start-up Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. “Green” Device (Note 3) Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. 2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and Lead-free. 3. Halogen- and Antimony-free "Green” products are defined as those which contain