TPS51117

Product Folder Sample & Buy Technical Documents Tools & Software Support & Community TPS51117 SLVS631C – DECEMBER 2005 – REVISED MAY 2015 TPS51117 Single Synchronous Step-Down Controller 1 Features 1 High Efficiency, Low Power Consumption, 4.5-μA Typical Shutdown Current Fixed Frequency Emulated On-Time Control, Adjustable from 100 kHz to 550 kHz D-CAP™ Mode With 100-ns Load Step Response < 1% Initial Reference Accuracy Output Voltage Range: 0.75 V to 5.5 V Wide Input Voltage Range: 1.8 V to 28 V Selectable Auto-Skip/PWM-Only Operation Temperature Compensated (4500 ppm/°C) Low-Side RDS(on) Overcurrent Sensing Negative Overcurrent Limit Integrated Boost Diode Integrated OVP/UVP and Thermal Shutdown Powergood Signal Internal 1.2-ms Voltage Soft-Start Integrated Output Discharge (Soft-Stop) 2 Applications Notebook Computers I/O Supplies System Power Supplies 3 Description The TPS51117 device is a cost-effective, synchronous buck controller for POL voltage regulation in notebook PC applications. The controller is dedicated for the operation of the Adaptive OnTime D-CAP mode. This mode provides ease-of-use, low external component count, and fast transient response. Auto-skip mode for high efficiency down to the milliampere load range, or PWM-only mode for low-noise operation is selectable. The current-sensing scheme for positive overcurrent and negative overcurrent protection is loss-less lowside RDS(on) sensing plus temperature compensation...