Maxim Integrated MAX1748EUB: High-Efficiency, Low-Noise, Step-Up DC-DC Converter

The MAX1748EUB from Maxim Integrated is a compact, high-efficiency, low-noise step-up DC-DC converter that is designed to deliver a stable power supply for battery-powered devices. This versatile component is housed in a micro-sized, 10-pin µMAX package, making it an ideal solution for space-constrained applications where power efficiency and low noise are critical.

With a wide input voltage range of 2.7V to 5.5V, the MAX1748EUB is particularly well-suited for portable electronic devices that are powered by single-cell lithium-ion (Li+) batteries, multi-cell alkaline/NiMH batteries, or other standard power sources. It is capable of generating an adjustable output voltage up to 28V, which can be set with external resistors, providing design flexibility for various applications.

The device features a unique control scheme that maximizes efficiency over a wide load range. Its high switching frequency of up to 2MHz allows the use of small, low-cost capacitors and inductors, reducing the overall footprint and bill of materials for the power supply design. Additionally, the MAX1748EUB incorporates a low quiescent current and a shutdown mode that reduces the supply current to less than 1µA, further extending battery life in portable applications.

For noise-sensitive applications, the MAX1748EUB provides a low-noise operation. It achieves this by implementing a fixed-frequency, pulse-width modulation (PWM) control scheme, which minimizes the noise and ripple typically associated with step-up voltage conversion. Furthermore, the device includes soft-start capability to limit inrush current during startup, providing a smooth transition to regulation.

Protection features are also built into the MAX1748EUB to ensure reliable operation under adverse conditions. These include overvoltage protection, thermal shutdown, and current limit protection. These safeguards contribute to the longevity and stability of the end product by preventing damage from electrical overstress.

In summary, the Maxim Integrated MAX1748EUB is a versatile, high-efficiency step-up converter that offers low noise, small packaging, and a rich set of features, making it an excellent choice for designers looking to optimize power management in their next-generation portable devices.