MAX861ISA: High-Efficiency, Step-Up DC-DC Converter

The MAX861ISA is a compact, high-efficiency, step-up DC-DC converter designed by Maxim Integrated to provide a reliable power solution for portable electronic devices. This versatile integrated circuit is engineered to boost low input voltages to higher output voltages, making it ideal for battery-powered applications where extended run-time is crucial.

Featuring a wide input voltage range from 0.7V to 5.5V, the MAX861ISA is capable of starting up with input voltages as low as 0.7V and can operate down to 0.5V after startup. This makes it particularly suitable for devices powered by single-cell batteries, such as alkaline or lithium cells.

The converter utilizes a current-limited, pulse-frequency modulation (PFM) control scheme to achieve high efficiency over a wide range of load conditions. With its high 94% efficiency and quiescent current as low as 20µA, the MAX861ISA ensures minimal power wastage, thereby prolonging battery life in portable devices.

Enclosed in a space-saving 8-pin SO package, the MAX861ISA also incorporates a number of protective features to ensure safe operation. These include thermal shutdown, frequency foldback, and logic-controlled shutdown. The frequency foldback feature helps reduce output current during short-circuit conditions, while the thermal shutdown mechanism protects the device from overheating.

Applications for the MAX861ISA are diverse and include but are not limited to personal digital assistants (PDAs), portable media players, handheld instruments, and backup power supplies. Its small footprint and high efficiency make it an excellent choice for designers looking to optimize power management in compact, battery-driven electronics.

Overall, the MAX861ISA from Maxim Integrated stands out as a robust, efficient, and versatile step-up converter that meets the needs of modern portable applications, where maximizing battery life without sacrificing performance is essential.

Key Features:

• Wide input voltage range: 0.7V to 5.5V
• High efficiency up to 94%
• Low quiescent current: 20µA
• Space-saving 8-pin SO package
• Protective features: thermal shutdown, frequency foldback, logic-controlled shutdown