Maxim Integrated MAX1681ESA+T Switched-Capacitor Voltage Converter

The MAX1681ESA+T from Maxim Integrated is a high-efficiency, low-quiescent-current, switched-capacitor voltage inverter that is designed to provide a simple and compact power conversion solution for a wide range of applications. This device is particularly well-suited for battery-powered equipment, where extended battery life is crucial, as well as for space-constrained applications due to its small size and minimal external component requirements.

The MAX1681ESA+T operates with a supply voltage ranging from 1.5V to 5.5V, making it versatile for use with various battery chemistries and configurations. The device can deliver a steady output current of up to 100mA, with an output voltage that is inverted from the input voltage, allowing for the generation of a negative supply from a positive input.

One of the key features of the MAX1681ESA+T is its high power efficiency, which can reach up to 95% under certain conditions. This is achieved through the use of low-resistance switches and a low quiescent current of only 110µA, which further contributes to battery life preservation. Additionally, the device incorporates a frequency selection pin that allows users to optimize the device's switching frequency between 12kHz and 35kHz to balance efficiency and external component size.

The MAX1681ESA+T comes in a small 8-pin SO package, which is suitable for automated assembly processes and is designed for surface-mount technology (SMT), providing a compact footprint on printed circuit boards (PCBs). The device's thermal shutdown feature ensures protection against overheating, and it is specified over the extended temperature range of -40°C to +85°C, making it reliable for use in various environmental conditions.

Overall, the Maxim Integrated MAX1681ESA+T is a robust, efficient, and versatile voltage converter solution that offers designers a straightforward approach to generating a negative voltage rail in their electronic designs. Its ease of use, coupled with its high efficiency and low power consumption, makes it an excellent choice for portable devices, medical equipment, and any other application where space and power efficiency are critical.