Buck 23 Click

How does it work?

Buck 23 Click is based on the MAX20010C, a high-efficiency, synchronous step-down converter from Analog Devices, providing interface-configurable output voltage range from 0.5V to 1.58V. The MAX20010C offers a factory-preset output voltage of 1V and supports dynamic voltage adjustment with programmable slew rates. Other features include programmable soft-start, overcurrent, and overtemperature protections. The wide input/output voltage range, ±2% output voltage accuracy, and the ability to provide up to 6A load current make this Click board™ an ideal solution for on-board point-of-load and post-regulation applications.

The MAX20010C features a synchronization input, marked as SYN and routed to the PWM pin of the mikroBUS™ socket, that puts the converter either in skip mode or forced-PWM mode of operation. In PWM mode, the converter switches at a constant frequency with variable on-time. In skip mode, the converter’s switching frequency is load-dependent until the output load reaches a certain threshold.

This Click board™ communicates with MCU using the standard I2C 2-Wire interface to read data and configure settings. Also, the MAX20010C allows choosing its I2C slave address using the SMD jumper labeled ADDR SEL. Besides, it also possesses a power-good function and a device-enable feature. The power-good feature is routed to the red LED marked as PGOOD and PG pin of the mikroBUS™ socket, indicating that the output reached regulation, while the EN pin serves for power ON/OFF purposes optimizing power consumption (converter operation permission).

This Click board™ can operate with either 3.3V or 5V logic voltage levels selected via the VCC SEL jumper. This way, it is allowed for both 3.3V and 5V capable MCUs to use the communication lines properly. Additionally, there is a possibility for the MAX20010C power supply selection via jumper labeled as VDD SEL to supply the MAX20010C from an external power supply terminal in the range from 3V to 5.5V or with mikroBUS™ power rails. 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

Pinout diagram

This table shows how the pinout on Buck 23 Click 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	SYN	Synchronization
Enable	EN	2	RST	INT	15	PG	Power-Good
	NC	3	CS	RX	14	NC
	NC	4	SCK	TX	13	NC
	NC	5	MISO	SCL	12	SCL	I2C Clock
	NC	6	MOSI	SDA	11	SDA	I2C Data
Power Supply	3.3V	7	3.3V	5V	10	5V	Power Supply
Ground	GND	8	GND	GND	9	GND	Ground

Onboard settings and indicators

Buck 23 Click electrical specifications

Software Support

We provide a library for the Buck 23 Click as well as a demo application (example), developed using Mikroe compilers. The demo can run on all the main Mikroe development boards.

Package can be downloaded/installed directly from NECTO Studio Package Manager(recommended), downloaded from our LibStock™ or found on Mikroe github account.

Library Description

This library contains API for Buck 23 Click driver.

Key functions

• buck23_set_vstep This function sets the voltage output step to 10mV or 12.5mV.

• buck23_set_vout This function sets the voltage output.

• buck23_get_pg_pin This function returns the PG (power good) pin logic state.

Example Description

This example demonstrates the use of Buck 23 Click board™ by changing the output voltage.

void application_task ( void ) 
 { 
     uint16_t vout_mv; 
     uint8_t status; 
     if ( BUCK23_OK == buck23_set_vstep ( &buck23, BUCK23_VSTEP_10 ) ) 
     { 
         log_printf ( &logger, " ------------------------------------rn" ); 
         log_printf ( &logger, " VOUT resolution: 10mVrn VOUT range: 500mV to 1270mVrn" ); 
         log_printf ( &logger, " ------------------------------------" ); 
     } 
     for ( vout_mv = BUCK23_VOUT_MIN_VSTEP_10; vout_mv <= BUCK23_VOUT_MAX_VSTEP_10; vout_mv += 50 ) 
     { 
         if ( BUCK23_OK == buck23_read_register ( &buck23, BUCK23_REG_STATUS, &status ) ) 
         { 
             log_printf ( &logger, "rn STATUS: 0x%.2Xrn", ( uint16_t ) status ); 
         } 
         if ( BUCK23_OK == buck23_set_vout ( &buck23, vout_mv ) ) 
         { 
             log_printf ( &logger, " VOUT: %u mVrn", vout_mv ); 
         } 
         if ( !buck23_get_pg_pin ( &buck23 ) ) 
         { 
             log_printf ( &logger, " ERROR: No power goodrn" ); 
             log_printf ( &logger, " Restarting devicern" ); 
             buck23_restart_device ( &buck23 ); 
             vout_mv -= 50; 
         } 
         Delay_ms ( 1000 ); 
     } 
     if ( BUCK23_OK == buck23_set_vstep ( &buck23, BUCK23_VSTEP_12_5 ) ) 
     { 
         log_printf ( &logger, " ------------------------------------rn" ); 
         log_printf ( &logger, " VOUT resolution: 12.5mVrn VOUT range: 625mV to 1587.5mVrn" ); 
         log_printf ( &logger, " ------------------------------------" ); 
     } 
     for ( vout_mv = BUCK23_VOUT_MIN_VSTEP_12_5; vout_mv <= BUCK23_VOUT_MAX_VSTEP_12_5; vout_mv += 50 ) 
     { 
         if ( BUCK23_OK == buck23_read_register ( &buck23, BUCK23_REG_STATUS, &status ) ) 
         { 
             log_printf ( &logger, "rn STATUS: 0x%.2Xrn", ( uint16_t ) status ); 
         } 
         if ( BUCK23_OK == buck23_set_vout ( &buck23, vout_mv ) ) 
         { 
             log_printf ( &logger, " VOUT: %u mVrn", vout_mv ); 
         } 
         if ( !buck23_get_pg_pin ( &buck23 ) ) 
         { 
             log_printf ( &logger, " ERROR: No power goodrn" ); 
             log_printf ( &logger, " Restarting devicern" ); 
             buck23_restart_device ( &buck23 ); 
             vout_mv -= 50; 
         } 
         Delay_ms ( 1000 ); 
     } 
 }

The full application code, and ready to use projects can be installed directly from NECTO Studio Package Manager(recommended), downloaded from our LibStock™ or found on Mikroe github account.

Other Mikroe Libraries used in the example:

• MikroSDK.Board
• MikroSDK.Log
• Click.Buck23

Additional notes and informations

Depending on the development board you are using, you may need USB UART click, USB UART 2 Click or RS232 Click to connect to your PC, for development systems with no UART to USB interface available on the board. UART terminal is available in all Mikroe compilers.

mikroSDK

This Click board™ is supported with mikroSDK – Mikroe Software Development Kit. To ensure proper operation of mikroSDK compliant Click board™ demo applications, mikroSDK should be downloaded from the LibStock and installed for the compiler you are using.

For more information about mikroSDK, visit the official page.