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TPS51221

ACTIVE

3-V to 28-V, synchronous dual-output peak current mode buck controller for notebook power

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TPS51397A ACTIVE 4.5-V to 24-V input, 10-A, synchronous step-down regulator Upgraded light-load efficiency with a lower IQ and an extended positive operating temperature range in a smaller package.

TPS51221

ACTIVE
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Product details

Vin (min) (V) 4.5 Vin (max) (V) 28 Iout (max) (A) 20 Operating temperature range (°C) -40 to 85 Control mode current mode Topology Buck Rating Catalog Vout (min) (V) 1 Vout (max) (V) 12 Features Enable, Frequency synchronization, Light Load Efficiency, Phase Interleaving, Power good, Synchronous Rectification Iq (typ) (µA) 1300 Duty cycle (max) (%) 99 Number of phases 1
Vin (min) (V) 4.5 Vin (max) (V) 28 Iout (max) (A) 20 Operating temperature range (°C) -40 to 85 Control mode current mode Topology Buck Rating Catalog Vout (min) (V) 1 Vout (max) (V) 12 Features Enable, Frequency synchronization, Light Load Efficiency, Phase Interleaving, Power good, Synchronous Rectification Iq (typ) (µA) 1300 Duty cycle (max) (%) 99 Number of phases 1
WQFN (RTV) 32 25 mm² 5 x 5
  • 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, PowerPAD are trademarks of Texas Instruments.
  • 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, PowerPAD are trademarks of Texas Instruments.

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.

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.

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* Data sheet Fixed Frequency 99% Duty Cycle Peak Current Mode Notebook System Pwr Controlle datasheet (Rev. A) 26 Feb 2009

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