TPS51117数据手册集成电路（IC）的DC-DC开关控制器规格书PDF

描述 Description

The TPS51117 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 RDS(on) 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.

特性 Features

• High Efficiency, Low Power Consumption, 4.5-µA Typical Shutdown Current
• Fixed Frequency Emulated On-Time Control, Adjustable from 100 kHz to 550 kHz
• D-CAP™ Mode With 100-ns Load Step Response
• Low-Side RDS(on) Overcurrent Sensing
• Negative Overcurrent Limit
• Integrated Boost Diode
• Integrated OVP/UVP and Thermal Shutdown
• Powergood Signal
• Internal 1.2-ms Voltage Soft-Start
• Integrated Output Discharge (Soft-Stop)
• APPLICATIONS
• Notebook Computers
• I/O Supplies
• System Power Supplies

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