TPS51220A

www.ti.com TPS51220A SLUS897E – DECEMBER 2008 – REVISED JANUARY 2013 Fixed Frequency, 99% Duty Cycle Peak Current Mode Notebook System Power Controller Check for Samples: TPS51220A FEATURES 1 2 Input Voltage Range: 4.5 V to 32 V Output Voltage Range: 1 V to 12 V Selectable Light Load Operation (Continuous / Auto Skip / Out-Of-Audio™ Skip) Programmable Droop Compensation Voltage Servo Adjustable Soft Start 200-kHz to 1-MHz Fixed-Frequency PWM Selectable Current/ D-CAP™ Mode Architecture 180° Phase Shift Between Channels Resistor or Inductor DCR Current Sensing Adaptive Zero Crossing Circuit Powergood Output for Each Channel OCL/OVP/UVP/UVLO Protections (OVP Disable Option) Thermal Shutdown (Non-Latch) Output Discharge Function (Disable Option) Integrated Boot Strap MOSFET Switch QFN-32 (RTV/RSN) Package APPLICATIONS Notebook Computer System and I/O Bus Point of Load in LCD TV, MFP DESCRIPTION The TPS51220A is a dual synchronous buck regulator controller with two LDOs. It is optimized for 5-V/3.3-V system controller, enabling designers to cost effectively complete 2-cell to 4-cell notebook system power supply. The TPS51220A supports high efficiency, fast transient response, and 99% duty cycle operation. It supports supply input voltage ranging from 4.5 V to 32 V, and output voltages from 1 V to 12 V. Two types of control schemes can be chosen depending on the application. Peak current mode supports stability operation with lower ESR capac...