TPS51117

针对轻载效率优化的具有 DCAP™ 模式的 1.8V 至 28V 输入同步 降压控制器

The device is a cost-effective, synchronous buck controller for POL voltage regulation in notebook PC applications. The controller is dedicated for the operation of the Adaptive On-Time D-CAP mode. This mode provides ease-of-use, low external component count, and fast transient response. Auto-skip mode for high efficiency down to the milliampere load range, or PWM-only mode for low-noise operation is selectable.

The current-sensing scheme for positive overcurrent and negative overcurrent protection is loss-less low-side RDSon sensing plus temperature compensation. The device receives a 5-V 4.5 V to 5.5 V supply from another regulator such as the TPS51120 or TPS51020. The conversion input can be either VBAT or a 5-V rail, ranging from 1.8 V to 28 V, and the output voltage range is from 0.75 V to 5.5 V.

The TPS51117 is available in a 14-pin VQFN or a 14-pin TSSOP package and is specified from –40°C to 85°C.

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High Efficiency, Low Power Consumption, 4.5-µA

Typical Shutdown Current

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Fixed Frequency Emulated On-Time Control,

Adjustable from 100 kHz to 550 kHz

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D-CAP™ Mode With 100-ns Load Step Response

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< 1% Initial Reference Accuracy

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Output Voltage Range: 0.75 V to 5.5 V

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Wide Input Voltage Range: 1.8 V to 28 V

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Selectable Auto-Skip/PWM-Only Operation

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Temperature Compensated 4500 ppm/°C

Low-Side RDSon Overcurrent Sensing

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Negative Overcurrent Limit

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Integrated Boost Diode

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Integrated OVP/UVP and Thermal Shutdown

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Powergood Signal

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Internal 1.2-ms Voltage Soft-Start

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Integrated Output Discharge Soft-Stop

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APPLICA ONS

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Notebook Computers

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I/O Supplies

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System Power Supplies

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