Boost click - MikroElektronika Adjustable Output Voltage DAC

Boost click - MikroElektronika Adjustable Output Voltage DAC

Boost click carries Microchip’s MIC2606, a 2MHz, PWM DC/DC boost switching regulator available in a 2mm x 2mm MLF® package.

Boost click provides an adjustable output voltage through the onboard DAC that drives the FB pin of the MIC2606 to set desired output voltage. The click also has an onboard ADC that converts output voltage and sends its digital value through SPI pins of mikroBUS™ to the microcontroller. The input voltage can be set to 5V from mikroBUS™ or in range 7-20V from an external DC source connected to VIN screw terminal. The output voltage can be set up to 38V.

Note: If the user wants to connect external voltage to VIN, then the click needs the power supply unit connected to the VIN screw terminal.

How the click works

As you can see from the image there are two onboard screw terminals. One is for connecting the external VIN and the other is for connecting the load. The microcontroller reads the output voltage through the SPI from the onboard ADC and according to the desired output voltage, sends calculated data through SPI to an onboard DAC. 

The DAC drives the FB pin of the MIC2606 to set desired output voltage. The output voltage must always be set greater than the input voltage, otherwise, performance is not guaranteed. Instead of connecting external VIN it is possible to use 5V from mikroBUS. This is done by changing the positions of two onboard jumpers from position EXT to position 5V.

Note: Both of them must be in position 5V, otherwise performance is not guaranteed.

Boost click features

MIC2606 is a 0.5A, 2MHz Wide Input Range Boost Regulator with Integrated Switch and Schottky Diode. It’s FB (feedback) pin provides the control path to control the output. This FB pin is driven by an onboard DAC – MCP4921. This is a 2.7 – 5.5V, low-power, low DNL, 12-Bit Digital-to-Analog Converter (DAC) with SPI interface. It provides high accuracy and low noise performance for industrial applications. The output voltage is connected to an onboard ADC - MCP3551 - through a voltage divider. MCP3551 is a 2.7V to 5.5V low-power, 22-bit Delta-Sigma Analog-to-Digital Converter.

The reference voltage for both the ADC and DAC is provided by MAX6106 – onboard voltage reference.

Specifications