30 min

Ensure stable and safe operation of various systems with MIC33153 and PIC18F57Q43

Convert voltage with confidence!

MIC33153 Click with Curiosity Nano with PIC18F57Q43

Published Feb 13, 2024

Click board™

MIC33153 Click


Curiosity Nano with PIC18F57Q43


NECTO Studio



Upgrade to a more efficient voltage solution, integrate DC-DC buck regulator, power up applications with clean voltage!



Hardware Overview

How does it work?

MIC33153 Click is based on the MIC33153, a 4MHz DC-DC buck regulator with integrated inductor and Hyperlight Load™ technology, from Microchip. This integrated buck regulator requires minimal external components, including the inductor. This simplifies the design greatly, retaining the advertised electrical characteristics. Also, thermal shutdown and current limit protection features ensure safe operation, even in case of errors and short circuits. This Click operates with an input voltage range from 2.7V up to 5.5V, and it can deliver a regulated output ranging from 0.8V to 3.5V, with up to 1.2A. The output voltage is selectable, and the voltage on the FB pin manages it. This pin is routed to the output of the MCP4921, a 12-bit DAC converter from Microchip, with the SPI interface. The voltage on the DAC output affects the FB pin voltage, which in turn affects the main output voltage. A voltage divider connected between the main output terminal and the GND allows monitoring of the output voltage via the AN pin of the mikroBUS™. This gives an insight into the output voltage condition: if the output voltage deviates from the desired value, the corrected value can be sent to the DAC. MCP4921 DAC converter has its SPI lines routed to the mikroBUS™, so it is enough to send a new value via the SPI of the click board™ if a correction is needed. Of course, being a buck converter,

the Click board™ expects higher input voltage than it is set at its output. The proprietary HyperLight Load™ technology allows it to operate efficiently when a very light load is connected to the output terminal. Instead of using the continuous PWM signal to operate the DC-DC buck converter, it goes into the discontinuous mode, with the pulse frequency modulation (PFM) signal used for regulating the output. As the output current rises, the device enters the continuous conducting mode (CCM) with the PWM frequency at 4MHz. The transition is transparent and happens automatically when the output current rises above a certain level. This level depends on the duty cycle of the internal PWM signal, input and output voltages, PWM frequency, and the internal coil inductance, and it is about 200mA for the VIN = 3.6V and VOUT = 1.8V. The EN pin of the MIC33153 is also routed to the mikroBUS™, and it is used to turn off the output stage of the DC-DC step-down converter. A logic HIGH signal will activate the device, while the logic LOW will put the device in shutdown mode with very low power consumption. The EN pin is subject to a soft start circuitry that reduces the inrush current and prevents the output voltage from overshooting at the start-up. The Soft start delay is determined by the capacitor connected to the SS pin, which is fixed to around 300µS for the

MIC33153 Click. The EN pin is pulled HIGH by the onboard resistor. The PG pin of the MIC33153 is routed to the INT pin of the mikroBUS™, and it is used to signalize the power good status of the output voltage. An open drain output is pulled low when the output voltage drops under 86%. It reverts to the HIGH logic state when the output voltage reaches 92% of its steady state. It can generate the interrupt event on the controller or otherwise signal the output voltage problem. The PG pin is pulled HIGH by the onboard resistor. The MIC33153 click has two robust screw terminals connecting the input and output voltage rails. Instead of the input terminal, the click can use the voltage input from the development system if the VIN SEL SMD jumper is switched to the VCC position (default jumper position). MIC33153 click can work with both 3.3V and 5V rated MCUs. The VCC SEL SMD jumper should be switched to the correct position, indicated by the label - 3.3V or 5V, to select the desired operational voltage. It should be noted that the selected voltage will be used as the internal voltage supply for the buck converter input if selected so by the VIN SEL. Also, 3.3V is required regardless of the position of the VCC SEL jumper since the MCP4921 DAC is powered up from the 3.3V rail directly.

MIC33153 Click hardware overview image

Features overview

Development board

PIC18F57Q43 Curiosity Nano evaluation kit is a cutting-edge hardware platform designed to evaluate microcontrollers within the PIC18-Q43 family. Central to its design is the inclusion of the powerful PIC18F57Q43 microcontroller (MCU), offering advanced functionalities and robust performance. Key features of this evaluation kit include a yellow user LED and a responsive

mechanical user switch, providing seamless interaction and testing. The provision for a 32.768kHz crystal footprint ensures precision timing capabilities. With an onboard debugger boasting a green power and status LED, programming and debugging become intuitive and efficient. Further enhancing its utility is the Virtual serial port (CDC) and a debug GPIO channel (DGI

GPIO), offering extensive connectivity options. Powered via USB, this kit boasts an adjustable target voltage feature facilitated by the MIC5353 LDO regulator, ensuring stable operation with an output voltage ranging from 1.8V to 5.1V, with a maximum output current of 500mA, subject to ambient temperature and voltage constraints.

PIC18F57Q43 Curiosity Nano double side image

Microcontroller Overview

MCU Card / MCU




MCU Memory (KB)


Silicon Vendor


Pin count


RAM (Bytes)


You complete me!


Curiosity Nano Base for Click boards is a versatile hardware extension platform created to streamline the integration between Curiosity Nano kits and extension boards, tailored explicitly for the mikroBUS™-standardized Click boards and Xplained Pro extension boards. This innovative base board (shield) offers seamless connectivity and expansion possibilities, simplifying experimentation and development. Key features include USB power compatibility from the Curiosity Nano kit, alongside an alternative external power input option for enhanced flexibility. The onboard Li-Ion/LiPo charger and management circuit ensure smooth operation for battery-powered applications, simplifying usage and management. Moreover, the base incorporates a fixed 3.3V PSU dedicated to target and mikroBUS™ power rails, alongside a fixed 5.0V boost converter catering to 5V power rails of mikroBUS™ sockets, providing stable power delivery for various connected devices.

Curiosity Nano Base for Click boards accessories 1 image

Used MCU Pins

mikroBUS™ mapper

Analog Output
Chip Enable
SPI Chip Select
SPI Clock
Power Supply
Power Good Indicator
Power Supply

Take a closer look


MIC33153 Click Schematic schematic

Step by step

Project assembly

Curiosity Nano Base for Click boards front image hardware assembly

Start by selecting your development board and Click board™. Begin with the Curiosity Nano with PIC18F57Q43 as your development board.

Curiosity Nano Base for Click boards front image hardware assembly
Charger 27 Click front image hardware assembly
PIC18F47Q10 Curiosity Nano front image hardware assembly
Prog-cut hardware assembly
Charger 27 Click complete accessories setup image hardware assembly
Curiosity Nano with PICXXX Access MB 1 - 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
PIC18F57Q43 Curiosity 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 MIC33153 Click driver.

Key functions:

  • mic33153_write_dac - This function writes 12-bit value to DAC and that causes that output voltage be seted on determined value

  • mic33153_enable_out - This function enables or disables output voltage depending on the state value

  • mic33153_check_power_good - This function hecks state of PG (INT) pin

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 
 * \brief Mic33153 Click example
 * # Description
 * This app enables step-down (buck) converter.
 * The demo application is composed of two sections :
 * ## Application Init 
 * Initializes click driver.
 * ## Application Task  
 * Activates the output voltage of the device, and then sets output voltage to various different values.
 * All data is being logged on USB UART.  
 * \author MikroE Team
// ------------------------------------------------------------------- INCLUDES

#include "board.h"
#include "log.h"
#include "mic33153.h"

// ------------------------------------------------------------------ VARIABLES

static mic33153_t mic33153;
static log_t logger;

// ------------------------------------------------------ APPLICATION FUNCTIONS

void application_init ( void )
    log_cfg_t log_cfg;
    mic33153_cfg_t cfg;

     * 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.

    mic33153_cfg_setup( &cfg );
    MIC33153_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    mic33153_init( &mic33153, &cfg );
    Delay_ms( 100 );

void application_task ( void )
    mic33153_enable_out( &mic33153, MIC33153_OUT_ENABLE );
    mic33153_write_dac ( &mic33153, MIC33153_VOLTAGE_1000MV );
    log_printf( &logger, "Output voltage set to 1000mV\r\n" );
    mic33153_write_dac ( &mic33153, MIC33153_VOLTAGE_1500MV );
    log_printf( &logger, "Output voltage set to 1500mV\r\n" );
    mic33153_write_dac ( &mic33153, MIC33153_VOLTAGE_2000MV );
    log_printf( &logger, "Output voltage set to 2000mV\r\n" );
    mic33153_write_dac ( &mic33153, MIC33153_VOLTAGE_2500MV );
    log_printf( &logger, "Output voltage set to 2500mV\r\n" );
    mic33153_write_dac ( &mic33153, MIC33153_VOLTAGE_3000MV );
    log_printf( &logger, "Output voltage set to 3000mV\r\n" );
    mic33153_write_dac ( &mic33153, MIC33153_VOLTAGE_3200MV );
    log_printf( &logger, "Output voltage set to 3200mV\r\n" );
    log_printf( &logger, "-----------------------------------\r\n" );

void main ( void )
    application_init( );

    for ( ; ; )
        application_task( );

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

Additional Support