Tps5117rgyr DC-DC control chip has the lowest price of step-down controller

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 OnTime 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
• 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
• < 1% Initial Reference Accuracy
• Output Voltage Range: 0.75 V to 5.5 V
• Wide Input Voltage Range: 1.8 V to 28 V
• Selectable Auto-Skip/PWM-Only Operation
• Temperature Compensated (4500 ppm/°C)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