TPS51220A

固定频率 99% 占空比峰值电流模式笔记本系统功率控制器

The is a dual synchronous buck regulator controller with two 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 TPS51220A supports high efficiency, fast transient response, and 99% duty cycle operation. It supports supply input voltage ranging from 4.5 V to 32 V, and output voltages from 1 V to 12 V. Two types of control schemes can be chosen depending on the application. Peak current mode supports stability operation with lower ESR capacitor and output accuracy. The D-CAP mode supports fast transient response. The high duty 99% operation and the 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 1 MHz by a resistor, and each channel runs 180° out-of-phase. The TPS51220A can also synchronize to the external clock, and the interleaving ratio can be adjusted by its duty. The TPS51220A is available in the 32-pin 5×5/4×4 QFN package and is specified from –40°C to 85°C.

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Input Voltage Range: 4.5 V to 32 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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Selectable Current/D-CAP 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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Adaptive Zero Crossing Circuit

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Powergood Output for Each Channel

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OCL/OVP/UVP/UVLO Protections

OVP Disable Option

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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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QFN-32 RTV/RSN Package

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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