• 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

Out-of_Audio, D-CAP, PowerPAD are trademarks of Texas Instruments.

The TPS51221 is a dual synchronous buck regulator controller with 2 LDOs. It is optimized for 5V/3.3V system controller, enabling designers to cost effectively complete 2-cells to 4-cells notebook system power supply. The TPS51221 supports high efficiency, fast transient response and 99% duty cycle operation. It supports supply input voltages ranging from 4.5V to 28V, and output voltages from 1V to 12V. 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 kHz 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.