MAX641ACSA

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The MAX641ACSA is a low-voltage, integrated DC-DC step-down switching regulator designed for battery-powered applications. It is ideal for hand-held products, such as automotive and portable electronics, cellular phones, and PDAs. This integrated device combines a full-featured regulator, two protection circuits, and an internal power MOSFET in an 8-pin SOIC (Small Outline Integrated Circuit) package.

Application Field

The MAX641ACSA is used in handheld devices to provide system power from a rechargeable battery such as Li-ion, Li-polymer, and NiMH batteries. These batteries typically have voltage levels between 3V and 4.2V. The MAX641ACSA is designed to operate from a single input voltage and provides continuous output currents from 0.5A to 1.3A. It can operate between an input voltage of 2.5V to 6V, making it an ideal choice for a wide variety of applications. The switching regulator also has an integrated thermal protection circuit, which shuts off the output in case of overtemperature. This ensures safe operation, even under high current conditions. Furthermore, the MAX641ACSA is equipped with over current and over voltage protection, providing protection against damage caused by reversed input power.

Working Principle

The MAX641ACSA is a DC-DC step-down switching regulator with an integrated internal power MOSFET. It works by switching the input voltage through the MOSFET at a fixed frequency. The MOSFET switches on and off at regular intervals, converting the input voltage to a near-constant output voltage. The output voltage is regulated by the current-mode control feature, which adjusts the duty cycle of the switching regulator to maintain a stable output voltage. The switching regulator also contains protection circuits to protect against overtemperature and overcurrent. An external sense resistor monitors current through the switching regulator and provides inputs to the protection circuits. The protection circuits also provide a switch-off feature for safety.

Conclusion

The MAX641ACSA is an integrated DC-DC step-down switching regulator that is ideal for battery-powered applications such as portable electronics, automotive, and PDAs. It provides continuous output current of up to 1.3A, with an input voltage range of 2.5V to 6V. The current-mode control feature adjusts the duty cycle of the switching regulator and the protection circuits provide over-current and overtemperature protection. This integrated package provides a convenient and low-cost solution for engineers designing battery-powered applications.

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