HOW DOES IT WORK?

Step Down 11 Click is based on the TPSM82913, a low-noise and low-ripple buck power module from Texas Instruments. The devices operate at a fixed switching frequency of 2.2MHz or 1MHz, which depends on the smart configuration input of the buck module. The AD5142A, a dual-channel 256-position nonvolatile digital potentiometer, controls the smart configuration input. By controlling the smart configuration input, you enable or disable spread spectrum modulation. DC/DC converters generate an output voltage ripple at the switching frequency. The AD5142A also controls the feedback input of the buck module with its other wiper. In addition, the Step Down 11 Click features a soft start, high output accuracy, power-good output, and more.

Step Down 11 Click uses a standard 2-wire interface of the AD5142A to allow the host MCU to set the output voltage, supporting 3MHz bandwidth. You can reset the digital potentiometer over the RST pin in case of need. The I2C address can be selected over the ADDR SEL jumpers (0 set by default). The power-good PG pin will be asserted if the output voltage is not within the specified window threshold. The EN pin is a precision enable input to the regulator.

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