MAXREFDES1213: Smart Electronic Load Using the MAX32630FTHR and MAX11311
Designed, Built, Tested
The Reference Design Document describes the hardware pictured below. It provides a detailed systematic technical guide to designing a Smart Electronic Load Using the MAX32630FTHR and MAX11311. The hardware was built according to the linked Schematic, Bill of Materials and PCB Artwork. It was tested by Maxim Integrated’s expert applications engineering team in a state-of-the-art design lab.
The MAXREFDES1213 is a reference design showcasing the MAX32630FTHR and MAX11311, as well as several other Maxim products, that demonstrates a small size, low-cost, portable electronic load (E-load) for testing power converters and PMICs. The MAX32630FTHR is an Arm®-core-based, low-power microcontroller board whose main purpose is to facilitate communication between the PC’s graphical user interface (GUI) software and the E-load. The MAX11311 12-port programmable mixed-signal I/O (PIXI™) with 12-bit ADC, 12-bit DAC, analog switches, and GPIO is used to control the load currents and measure various parameters of the E-load.
Other Maxim components in this design include the MAX44251 20V, ultra-precision, low-noise op amp, which is used to control the load currents; the MAX8614 dual-output (+ and -) DC-DC converter for biasing the MAX11311; the MAX8881 12V, ultra-low-IQ, low-dropout linear regulator with power-OK (POK), which is used to power different components on the E-load board; and the MAX44243 36V, low-noise, precision quad op amp, which is used for signal conditioning.
The power that is dissipated in the power MOSFETs is drained using a heatsink with a cooler fan (the Thermaltake® CLP0556). The MAX6645 automatic PWM fan-speed controller with overtemperature output controls the fan speed based on the heatsink temperature.