Maxim Integrated MAX639ESA+ Voltage Converter

The MAX639ESA+ is a high-efficiency, CMOS, step-up DC-DC voltage converter designed and manufactured by Maxim Integrated. This versatile component is engineered to convert lower voltage inputs to higher voltage outputs, making it an ideal solution for battery-powered devices where extending the battery life is crucial.

With an input voltage range of 2V to 16.5V, the MAX639ESA+ is capable of delivering a fixed output voltage of 5V or an adjustable output from 4.5V to 5.5V, accommodating a wide array of electronic applications. Its high efficiency, up to 92%, is achieved through an on-chip, low-resistance N-Channel MOSFET switch. This efficiency ensures minimal power loss during conversion, thereby maximizing the energy utilization from the source.

The MAX639ESA+ comes in a compact 8-pin SOIC package, which is suitable for space-constrained applications. Its small form factor does not compromise its performance, as it can supply up to 225mA of output current when the input voltage is above 3V. This makes it an excellent choice for portable devices, such as personal digital assistants (PDAs), handheld instruments, and mobile communication devices.

Additional features of the MAX639ESA+ include a low quiescent current of just 110µA, which further enhances its battery-saving capabilities. The device also offers a shutdown mode that reduces the supply current to a mere 20µA, providing an effective means to conserve power when the device is not in active use.

For design flexibility, the MAX639ESA+ includes an internal oscillator set at a switching frequency of 160kHz, which allows the use of small, surface-mount inductors and capacitors. This contributes to a reduced overall footprint and lower system costs. Additionally, the device is equipped with thermal overload protection and current limiting to ensure reliable operation under various conditions.

In summary, the Maxim Integrated MAX639ESA+ is a robust and efficient solution for voltage conversion in battery-powered electronics, offering both performance and practicality for designers looking to optimize their power management strategies.