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Fixed Frequency 99% Duty Cycle Peak Current Mode Notebook System Power Dual Controller


Package | PIN: RTV | 32
Temp: I (-40 to 85)
Carrier: Cut Tape
Qty Price
1-9 $4.34
10-24 $3.90
25-99 $3.64
100-249 $3.27
250-499 $3.05
500-749 $2.65
750-999 $2.30
1000+ $2.25


  • 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)
    • Notebook Computer System and I/O Bus
    • Point of load in LCD TV, MFP

Out-Of-Audio, PowerPAD are trademarks of Texas Instruments.

Texas Instruments  TPS51221RTVR

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 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.