MAX17681EVKITF#

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The MAX17681EVKITF# is an evaluation board from Maxim Integrated that features the MAX17681 Constant On-Time automotive synchronous buck controller, which has been optimized for automotive power systems. The EVKITF#\'s application field includes most standard electrical systems found in motor vehicles, including DC/DC & AC/DC (Off-Line) SMPS.

The main advantage of the MAX17681EVKITF# lies in its ability to maintain constant light-load efficiency and low quiescent current. It uses a Constant On-Time (COT) control mode, which minimizes peak inductor current losses and maximises integration of the inductor. This ensures minimal overall converter area and a high efficiency at light loads.

The main components of the DC/DC & AC/DC (Off-Line) SMPS application field of the MAX17681EVKITF# are:

• The MAX17681 synchronous buck converter, which includes the following features:
• Current Mode Constant On-Time (COT) Control
• 2% Output Voltage Accuracy without external components
• High-Efficiency Synchronous Switching
• Integrated Overvoltage and Undervoltage Protection (OVP/UVP)
• External components, including:
• MOSFETs (2x)
• Inductor
• Capacitors
• Diode
• Control and reference circuitry, including:
• Power-On-Reset
• Analog Voltage Reference
• A/D Control Interface
• The MAX17681EVKITF# board offers several features that make it well-suited for DC/DC & AC/DC (Off-Line) SMPS, including:
• High-Efficiency Synchronous Switching at Light Loads
• Current Mode Constant On-Time (COT) Control
• Low Quiescent Current for Maximum Efficiency in Light Load Conditions
• Integrated Overvoltage and Undervoltage Protection (OVP/UVP)
• Power-On-Reset (POR) Circuitry

The MAX17681EVKITF# board features current mode Constant On-Time (COT) control. This provides several advantages when compared to traditional voltage mode control, which is typically used in SMPS applications. COT control ensures a constant switching frequency regardless of load, which minimizes peak inductor current losses and maximizes integration of the inductor. This results in minimized overall converter area and a high efficiency at light loads. Additionally, COT control ensures a fast transient response, making it ideal for automotive applications.

The MAX17681EVKITF# also features a low quiescent current that ensures maximum efficiency in light load conditions. This can be further reduced by using external enabling circuitry, such as a power-on reset (POR) circuit. The board also features integrated overvoltage and undervoltage protection (OVP/UVP) circuitry.

The MAX17681EVKITF# has a wide range of applications in the DC/DC & AC/DC (Off-Line) SMPS field. Its features, such as current mode Constant On-Time (COT) control and low quiescent current, make it a great choice for automotive applications. In addition, the board’s integrated OVP and UVP circuitry provides robust protection against output voltage faults. Overall, the MAX17681EVKITF# is a highly reliable and efficient board that can be used in a variety of DC/DC & AC/DC (Off-Line) SMPS applications.

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