HOW DOES IT WORK?

Boost 8 Click is based on the LT1945, a dual micropower DC/DC converter from Analog Devices that boosts an input voltage to a higher level required by an output load. The LT1945 uses a constant off-time control scheme to provide high efficiency over a wide range of output currents. Each converter inside the LT1945 is designed with a 350mA current limit generating well-regulated positive and negative outputs of ±12V or ±24V, making the LT1945 ideal for various applications. It also contains additional circuitry to provide protection during the Start-Up sequence and under short-circuit conditions, reducing the average inductor output current and minimizing the power dissipation in the power switch.

As mentioned before, the LT1945 can configure the positive and negative output voltage in the ±12V or ±24V range. The desired output voltage can be selected by positioning SMD jumpers labeled as +VOUT SEL and -VOUT SEL to an appropriate position. It is also possible to control the activity of the output channels via two mikroBUS™ pins, EN+ and EN- pins, routed to the RST and PWM pin of the mikroBUS™ socket. By setting these pins to a high logic state, we set the converter outputs to an active state, and regulated voltages are available at the output terminals. In the same way, setting these pins to a low logic level disables the channels.

This Click board™ can only be operated from a 3.3V logic voltage level. Therefore, the board must perform appropriate logic voltage level conversion before using MCUs with different logic levels. Additionally, there is a possibility for the LT1945 power supply selection via jumper labeled as VIN SEL to supply the LT1945 from an external power supply terminal in the range from 2.7V to 5V or with 3.3V from mikroBUS™ power rail. However, the Click board™ comes equipped with a library containing easy-to-use functions and an example code that can be used, as a reference, for further development.

SPECIFICATIONS