TPS51221

固定频率 99% 占空比峰值电流模式笔记本系统功率双路控制器

The 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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Input Voltage Range: 4.5 V to 28 V

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Output Voltage Range: 1 V to 12 V

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Selectable Light Load Operation Continuous / Auto Skip / Out-Of-Audio™ Skip

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Programmable Droop Compensation

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Voltage Servo Adjustable Soft Start

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200 kHz to 1 MHz Fixed Frequency PWM

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Current Mode Architecture

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180° Phase Shift Between Channels

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Resistor or Inductor DCR Current Sensing

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Powergood Output for each channel

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OCL/OVP/UVP/UVLO protections

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Current Monitor Output for CH1

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Thermal Shutdown Non-latch

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Output Discharge Function Disable option

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Integrated Boot Strap MOSFET Switch

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QFN32 RTV

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APPLICA ONS

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Notebook Computer System and I/O Bus

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Point of load in LCD TV, MFP

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