10 min

Ensure a stable and regulated output voltage using MPM54304 and PIC32MZ2048EFM100

Step down voltage with confidence

Step Down 6 Click with Curiosity PIC32 MZ EF

Published Nov 12, 2023

Click board™

Step Down 6 Click

Dev Board

Curiosity PIC32 MZ EF


NECTO Studio



Our synchronous step-down DC-DC converter stands as a beacon of efficiency, ensuring precise voltage control and optimal power management for your applications, setting new standards in the industry.



Hardware Overview

How does it work?

Step Down 6 Click is based on the MPM54304, a quad-output power module from Monolithic Power Systems (MPS). This IC operates over a 4V to 16V input voltage range that can be supplied over the VIN screw terminal. It can step down input voltages as output voltages from 0.55V to 5.4V. The user can choose between straight or parallel output depending on the used output channels, from VOUT1 to VOUT4. Channels VOUT1 and VOUT2 can be paralleled to provide up to 6A of current, and channels VOUT3 and VOUT4 can be paralleled to provide up to 4A of current. The selection between quad and dual channel outputs can be set via the OUT SEL jumpers, where QUAD is selected by default. The user must set all five jumpers into the proper position for the output to work correctly. The MPM54304 has internal auto-compensation, which eliminates the need for an external compensation network, employs a constant-on-time (COT) control scheme to provide ultra-fast load transient responses, and minimizes

the required output capacitance. It also features a two-time, non-volatile programmable memory for storing register settings. Using the host MCU, users can set switching frequency, output voltage, over-current and over-voltage protection thresholds, power-on, power-off sequencing, and Forced PWM or Auto-PWM/PFM. Step Down 6 Click uses a standard 2-Wire I2C interface to communicate with the host MCU, supporting clock frequency up to 3.4MHz and ADDR SET jumper to set the I2C address. In addition to being enabled via the EN pin of the mikroBUS™ socket, the MPM54304 can also be enabled with the appearance of an external power supply by setting the EN SEL jumper to the appropriate position. For that to be done, the EN SEL jumper must be set to the EXT position, thus losing the enable function over the EN pin of the mikroBUS™ socket. The ADDR SET jumper actually uses the GPIO pin of the MPM54304, which can also be used for other purposes, as it is an input/output pin. This

pin can be configured as a Power-Good (PG) pin over the unpopulated IO header that will go to a LOW logic state if any enabled regulator falls below the under-voltage threshold or when all regulators are disabled. It can also be used in the Output Port mode, where it will output corresponding logic depending on the related register. Finally, it can also be used in the SYNCO mode, where it will become the sync output, allowing users to phase-shift the clock output to sync another device’s switching frequency. This 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. 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.

Step Down 6 Click hardware overview image

Features overview

Development board

Curiosity PIC32 MZ EF development board is a fully integrated 32-bit development platform featuring the high-performance PIC32MZ EF Series (PIC32MZ2048EFM) that has a 2MB Flash, 512KB RAM, integrated FPU, Crypto accelerator, and excellent connectivity options. It includes an integrated programmer and debugger, requiring no additional hardware. Users can expand

functionality through MIKROE mikroBUS™ Click™ adapter boards, add Ethernet connectivity with the Microchip PHY daughter board, add WiFi connectivity capability using the Microchip expansions boards, and add audio input and output capability with Microchip audio daughter boards. These boards are fully integrated into PIC32’s powerful software framework, MPLAB Harmony,

which provides a flexible and modular interface to application development a rich set of inter-operable software stacks (TCP-IP, USB), and easy-to-use features. The Curiosity PIC32 MZ EF development board offers expansion capabilities making it an excellent choice for a rapid prototyping board in Connectivity, IOT, and general-purpose applications.

Curiosity PIC32MZ EF double side image

Microcontroller Overview

MCU Card / MCU




MCU Memory (KB)


Silicon Vendor


Pin count


RAM (Bytes)


Used MCU Pins

mikroBUS™ mapper

Power Supply
I2C Clock
I2C Data

Take a closer look


Step Down 6 Click Schematic schematic

Step by step

Project assembly

Curiosity PIC32MZ EF front image hardware assembly

Start by selecting your development board and Click board™. Begin with the Curiosity PIC32 MZ EF as your development board.

Curiosity PIC32MZ EF front image hardware assembly
GNSS2 Click front image hardware assembly
Prog-cut hardware assembly
GNSS2 Click complete accessories setup image hardware assembly
Curiosity PIC32 MZ EF MB 1 Access - upright/background hardware assembly
Necto image step 2 hardware assembly
Necto image step 3 hardware assembly
Necto image step 4 hardware assembly
Necto image step 5 hardware assembly
Necto image step 6 hardware assembly
Curiosity PIC32 MZ EF MCU Step hardware assembly
Necto No Display image step 8 hardware assembly
Necto image step 9 hardware assembly
Necto image step 10 hardware assembly
Debug Image Necto Step hardware assembly

Track your results in real time

Application Output

After loading the code example, pressing the "DEBUG" button builds and programs it on the selected setup.

Application Output Step 1

After programming is completed, a header with buttons for various actions available in the IDE appears. By clicking the green "PLAY "button, we start reading the results achieved with Click board™.

Application Output Step 3

Upon completion of programming, the Application Output tab is automatically opened, where the achieved result can be read. In case of an inability to perform the Debug function, check if a proper connection between the MCU used by the setup and the CODEGRIP programmer has been established. A detailed explanation of the CODEGRIP-board connection can be found in the CODEGRIP User Manual. Please find it in the RESOURCES section.

Application Output Step 4

Software Support

Library Description

This library contains API for Step Down 6 Click driver.

Key functions:

  • stepdown6_set_en_pin - Step Down 6 set EN pin state function.

  • stepdown6_write_reg - Step Down 6 Register writing function.

  • stepdown6_set_out_voltage - Step Down 6 Set output voltage function.

Open Source

Code example

This example can be found in NECTO Studio. Feel free to download the code, or you can copy the code below.

 * @file main.c
 * @brief Step Down 6 Click example
 * # Description
 * This library contains API for the Step Down 6 Click driver.
 * This driver provides the functions to set the output voltage threshold.
 * The demo application is composed of two sections :
 * ## Application Init
 * Initialization of I2C module and log UART.
 * After driver initialization, default settings sets output voltage to 550 mV.
 * ## Application Task
 * This example demonstrates the use of the Step Down 6 Click board™ by changing 
 * output voltage every 5 seconds starting from 550 mV up to 1820 mV.
 * @author Stefan Ilic

#include "board.h"
#include "log.h"
#include "stepdown6.h"

static stepdown6_t stepdown6;
static log_t logger;

void application_init ( void ) 
    log_cfg_t log_cfg;  /**< Logger config object. */
    stepdown6_cfg_t stepdown6_cfg;  /**< Click config object. */

     * Logger initialization.
     * Default baud rate: 115200
     * Default log level: LOG_LEVEL_DEBUG
     * @note If USB_UART_RX and USB_UART_TX 
     * are defined as HAL_PIN_NC, you will 
     * need to define them manually for log to work. 
     * See @b LOG_MAP_USB_UART macro definition for detailed explanation.
    LOG_MAP_USB_UART( log_cfg );
    log_init( &logger, &log_cfg );
    log_info( &logger, " Application Init " );

    // Click initialization.
    stepdown6_cfg_setup( &stepdown6_cfg );
    STEPDOWN6_MAP_MIKROBUS( stepdown6_cfg, MIKROBUS_1 );
    if ( I2C_MASTER_ERROR == stepdown6_init( &stepdown6, &stepdown6_cfg ) ) 
        log_error( &logger, " Communication init." );
        for ( ; ; );
    if ( STEPDOWN6_ERROR == stepdown6_default_cfg ( &stepdown6 ) )
        log_error( &logger, " Default configuration." );
        for ( ; ; );
    log_info( &logger, " Application Task " );

void application_task ( void ) 
    err_t error_flag = STEPDOWN6_OK;
    for ( uint16_t n_cnt = STEPDOWN6_MIN_VOUT_VAL; n_cnt <= STEPDOWN6_MAX_VOUT_VAL; n_cnt += STEPDOWN6_INCREMENT_VOUT_VAL )
        error_flag |= stepdown6_set_out_voltage( &stepdown6, STEPDOWN6_SELECT_VOUT1, n_cnt );
        error_flag |= stepdown6_set_out_voltage( &stepdown6, STEPDOWN6_SELECT_VOUT2, n_cnt );
        error_flag |= stepdown6_set_out_voltage( &stepdown6, STEPDOWN6_SELECT_VOUT3, n_cnt );
        error_flag |= stepdown6_set_out_voltage( &stepdown6, STEPDOWN6_SELECT_VOUT4, n_cnt );
        log_printf( &logger, "  Set voltage : %d mV \r\n", n_cnt );
        Delay_ms( 5000 );

void main ( void ) 
    application_init( );

    for ( ; ; ) 
        application_task( );

// ------------------------------------------------------------------------ END

Additional Support