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.
Features
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- High Efficiency, Low Power Consumption, 4.5-µA
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- Typical Shutdown Current
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- Fixed Frequency Emulated On-Time Control,
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- 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)
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- Low-Side RDS(on) 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)
APPLICATIONS
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- Notebook Computers
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- I/O Supplies
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- System Power Supplies
