AP65455FN-7

AP65455 4A, 18V, 650kHz ADAPTIVE COT STEP-DOWN CONVERTER Description Pin Assignments 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. ( 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 FB 2 VREG5 3 SS 4 PG 5 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 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. Exposed Pad 11 PGND 10 VIN 9 VIN 8 BST 7 SW 6 SW U-DFN3030-10 This IC is available in U-DFN3030-10 package. Applications 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 650kHz 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 RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. “Green” Device (Note 3) Notes:        Gaming Consoles Flat Screen TV Sets and Monitors Set-Top Boxes Home Audio Consumer Electronics Network Systems Green Electronics 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