TPS51221 Datasheet | Texas Instruments

FEATURES - 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 pensation - Voltage Servo Adjustable Soft Start - 200 k Hz 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 puter 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 plete 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 accuracy. The high duty (99%) operation and wide input/ output voltage range supports flexible design for small mobile PCs and a wide variety of other applications. The fixed frequency can be adjusted from 200 k Hz to 1MHz by a resistor, and each channel runs 180° out of phase. The TPS51221 can also synchronize to the external clock, and the interleaving ratio can be adjusted by its duty. The TPS51221 is available in the 32-pin 5×5 QFN package and is specified from - 40°C to 85°C. TYPICAL APPLICATION CIRCUIT VO1 5.0V VBAT L1 C11 PGND Q11 C12 PGND Q12 PGND VO1 R01 VREG5 5V/100m A C01 C14 C24 PGND GND PGND 32 31 30 29 28 27 26...