HOW DOES IT WORK?

Step Down 9 Click is based on the MAX20406, an automotive fully integrated synchronous silent switcher buck converter from Analog Devices. It is a low EMI emission buck converter with integrated high-side and low-side switches and can operate in dropout by running at a 99% duty cycle. The Step Down 9 Click uses a TPL0501 digital potentiometer in a resistor divider configuration for an external output voltage adjustment. The TPL0501 is a single-channel digital potentiometer with an SPI interface from Texas Instruments. It has a 256-position resolution and 100KΩ of end-to-end resistance.

As mentioned, the Step Down 9 Click uses the TPL0501 and its 3-Wire SPI serial interface to communicate with the host MCE, supporting clock frequency of up to 25MHz. The voltage quality can be monitored by observing the PGOOD signal over the PG pin of the mikroBUS™ socket. The enable EN pin is an input for circuit activation, active with a HIGH logic state.

This Click board™ is also equipped with a 5-pin header that lets you use additional features of the MAX20406. The converter can use dual-phase operation for high-current applications, which is intended for forced-PWM mode only. If in forced-PWM mode, the SYO pin will be 180 degrees out of phase with the controller clock. If in Skip mode, then no clock will be present on the SYO pin. To set the skip mode, connect the SYI pin to the GND; otherwise, the forced-PWM mode will be selected if you connect the SYI to BIAS. VEA is an internal voltage loop error-amplifier output needed for dual-phase operation.

The MAX20406 can be configured as a controller or a target. While SYO is connected to the BIAS and the converter is enabled, there will be a procedure to detect if it is a controller or a target. In controller configuration, you can use a VEA pin to connect to a VEA of a target to ensure balanced current sharing between two phases. For more info, check the MAX20406's datasheet.

This Click board™ can operate with either 3.3V or 5V logic voltage levels selected via the VCC SEL jumper. This way, both 3.3V and 5V capable MCUs can use the communication lines properly. Also, this 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