Boost 8 Click Board™

Product Code: MIKROE-5468

How Does The Boost 8 Click Board™ Work? The Boost 8 Click Board™ 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 labelled 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. The Boost 8 Click Board™ can be operated only with a 3.3V logic voltage level. 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 labelled 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 Type Boost Applications Can be used to step up an input voltage to some higher level On-board modules LT1945 - dual micropower DC/DC converter from Analog Devices Key Features Regulated negative and positive outputs, current-limited, high efficiency, fixed off-time control scheme, low power consumption, selectable converter power supply, software-controlled output channels, and more Interface GPIO Compatibility mikroBUS Click board size M (42.9 x 25.4 mm) Input Voltage 3.3V,External PINOUT DIAGRAM This table shows how the pinout of Boost 8 Click Board™ corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns). Notes Pin Pin Notes NC 1 AN PWM 16 EN- Negative Channel Control Positive Channel Control EN + 2 RST INT 15 NC NC 3 CS RX 14 NC NC 4 SCK TX 13 NC NC 5 MISO SCL 12 NC NC 6 MOSI SDA 11 NC Power Supply 3.3V 7 3.3V 5V 10 NC Ground GND 8 GND GND 9 GND Ground ONBOARD SETTINGS AND INDICATORS Label Name Default Description LD1 PWR - Power LED Indicator JP1 +VOUT SEL Left Positive Output Voltage Selection +12V/+24V: Left position +12V, Right position +24V JP2 -VOUT SEL Left Negative Output Voltage Selection -12V/-24V: Left position -12V, Right position -24V JP3 VIN SEL Left LT1945 Power Supply Selection INT/EXT: Left position INT, Right position EXT BOOST 8 CLICK ELECTRICAL SPECIFICATIONS Description Min T