TPS51221

TPS51221 www.ti.com............................................................................................................................................... SLVS786A – NOVEMBER 2007 – REVISED MARCH 2009 Fixed Frequency, 99% Duty Cycle Peak Current Mode Notebook System Power Controller FEATURES 1 2 Input Voltage Range: 4.5 V to 28 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 Current Mode Architecture 180° Phase Shift Between Channels Resistor or Inductor DCR Current Sensing Powergood Output for each channel OCL/OVP/UVP/UVLO protections Current Monitor Output for CH1 Thermal Shutdown (Non-latch) Output Discharge Function (Disable option) Integrated Boot Strap MOSFET Switch QFN32 (RTV) APPLICATIONS Notebook Computer System and I/O Bus Point of load in LCD TV, MFP DESCRIPTION The TPS51221 is a dual synchronous buck regulator controller with 2 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 TPS51221 supports high efficiency, fast transient response and 99% duty cycle operation. It supports supply input voltage ranging from 4.5 V to 28 V, and output voltages from 1 V to 12 V. Peak current mode supports stability operation with lower ESR capacitor and output accura...