MAX861CSA+

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MAX861CSA+ Application Field and Working Principles

The MAX861CSA+ is a device that provides reliable regulation and protection of DC-DC voltages requested by low-voltage applications such as portable and medical equipment. Specifically, it is a DC-DC Switching Regulator, an integrated circuit designed to step-down the output voltage of an input source. This is accomplished by the boosting, bucking or inverting of DC voltages. The MAX861CSA+ offers a wide input voltage range and is suitable for a variety of low-current applications.

Features of the MAX861CSA+

The MAX861CSA+ offers some attractive features, namely:

• Ultra-low quiescent current: 30μA with full load current
• High switching frequency: 1.7MHz
• Wide input voltage range: 2.6V to 5.5V
• Low dropout voltage: 0.15V at full load current
• Integrated short-circuit protection
• Wide output voltage range: 0.8V to 4V
• Remote shutdown
• Thermal shutdown protection
• High-efficiency operation: 92% at full load
• Low output ripple: 20mVpp at full load
• Output overvoltage protection
• Pin-selectable frequency: 1.7MHz/2.5MHz/3MHz/4MHz

How the MAX861CSA+ Works

The MAX861CSA+ operates on the "switching regulator" principle of converting an input voltage to a regulated output voltage. This is accomplished by powering a switch, typically a MOSFET, on and off at a given frequency. On each cycle, the switch is turned on, causing the input voltage to be applied to the switching circuit, then it is turned off, allowing the output voltage to come into effect. This all happens at a predetermined frequency (1.7MHz) and still provides the necessary output voltage.

The MAX861CSA+\'s cycle command is generated using a voltage-mode, current-mode, or pulse-width-modulation (PWM) control scheme. When using the voltage-mode control scheme, the feedback network samples the output voltage and produces a control signal which is used to drive the switching circuit. In current-mode control, the feedback network samples the output current instead of the output voltage, providing better line and load regulation.

The MAX861CSA+ features integrated short-circuit protection to improve system reliability. If the output current exceeds the specified rating, the controller shuts down the output within a few microseconds to protect the system. The output can also be remotely controlled with an On/Off control pin, allowing the user to control the output with a logic signal.

Applications of MAX861CSA+

The MAX861CSA+ is incredibly versatile and can be used in a wide range of low-current applications. One such application is portable devices such as smartphones, where the MAX861CSA+ offers excellent power efficiency, with efficiency as high as 92%, and stability, with output ripple as low as 20mVpp.

It is also ideal for medical applications, such as ventilators and other medical equipment, where low noise and reliability are paramount. The MAX861CSA+ offers a wide input voltage range, allowing it to accommodate varying line and load conditions, as well as a wide output voltage range of 0.8V to 4V, making it suitable for low-voltage applications. Additionally, its integrated short-circuit protection ensures the system can recover from extremes.

Finally, the MAX861CSA+ is ideal for battery-powered applications. Its ultra-low quiescent current of 30μA allows it to offer long battery life, while its high efficiency ensures minimal energy losses.

Conclusion

The MAX861CSA+ device is a versatile DC-DC switching regulator suitable for a wide range of low-current applications. Its wide input voltage range and output voltage range, along with its ultra-low quiescent current, low dropout voltage and high efficiency make it an ideal choice for portable, medical and battery-powered applications.

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