Click here for production status of specific part numbers. Evaluates: MAX20058 MAX20058 Evaluation Kit General Description Quick Start The MAX20058 EV kit is a proven design to evaluate the Required Equipment MAX20058 high-efficiency, high-voltage, synchronous MAX20058 EV kit step-down DC-DC converter in a TDFN package. The EV Adjustable DC power supply kit is optimized to generate a 5V output at load currents up to 1A from a 24V input supply and can be reconfigured Digital multimeter (DMM) to meet other system requirements. The EV kit features Electronic load a 400kHz switching frequency. The EV kit can be used to monitor the ICs features such as adjustable input under- Procedure voltage lockout, adjustable soft-start, adjustable switching The EV kit is fully assembled and tested. Use the follow- frequency, adjustable current limit, open-drain RESET ing the steps below to verify board operation: signal, and external frequency synchronization. 1) Verify that all jumpers are positioned to their default settings (Table 1). Features 2) Preset the power supply at a voltage to 24V. Disable Operates from 6.5V to 60V at 24V Nominal Input the power supply. Meets Stringent OEM Module Power Consumption 3) Preset the electronic load to 500mA. Disable the and Performance Specifications electronic load. 4) Connect the positive lead of the power supply to the 5V Output Voltage at 400kHz Switching Frequency VIN pad on the EV kit. Then, connect the negative Up to 1A Output Current with Adjustable Peak lead to the neighboring PGND PCB pad. Current Limit 5) Connect the positive terminal of the electronic load Jumpers for Quickly Adjusting Peak Current Limit and to VOUT PCB pad. Then, connect the negative lead Mode Selection to the neighboring PGND2 PCB pad. 6) Enable the DC power supply. Auxiliary Bootstrap LDO to Improve Efficiency 7) Using the DMM, verify that the voltage across VOUT Adjustable Soft-Start Time with External Capacitor and PGND2 PCB pads is 5V. Optimized Application Layout and Components for 8) Turn on the electronic load. Quick Design Implementation 9) Verify that the voltage across VOUT1 and PGND PCB pads is still close to 5V after load regulation. Fully Assembled and Tested 10) Turn off the electronic load. 11) Turn off the power supply. Ordering Information appears at end of data sheet. 319-100207 Rev 0 6/18Evaluates: MAX20058 MAX20058 Evaluation Kit Regulator Enable/Undervoltage-Lockout Detailed Description Level (EN/UVLO) The MAX20058 5V output EV kit provides a proven The device offers an adjustable input undervoltage-lock- design to evaluate the MAX20058 high-efficiency, high- out level. For always on operation, no shunt should be voltage, synchronous step-down DC-DC converter. The installed across JU1. To disable the output, install a shunt EV kit generates 5V at load currents up to 1A from a 6.5V across pins 2-3 on JU1 and the EN/UVLO pin is pulled to to 60V input supply. The EV kit features a 400kHz switch- GND. See Table 3 for JU1 settings. ing frequency for optimum efficiency and component size. The EV kit includes an EN/UVLO PCB pad and JU1 Set the voltage at which each converter turns on with a to enable the output at a desired input voltage. The RT/ resistive voltage-divider connected from VIN to SGND. SYNC PCB pad allows an external clock to synchronize Connect the center node of the divider to EN/UVLO pin. the device while the IC is set to FPWM through JU4 or Choose R1 as follows: JU5. A RESET PCB pad is available for monitoring when R1 110000 x V INU the converter output is in regulation. where VINU is the input voltage at which the MAX20058 Soft-Start Input (SS) is required to turn ON and R1 is in . Calculate the value The device implements adjustable soft-start operation of R2 as follows: to reduce inrush current and to minimize output volt- 1.215 R1 age overshoot during startup. A capacitor connected R2 = V 1.215+ (2.5AR1) INU from the SS pin to SGND (C6 on EV kit) programs the soft-start time for the corresponding output voltage. The Current Limit and Mode of selected output capacitance (CSEL) and the output volt- Operation Selection age (VOUT) determine the minimum required soft-start capacitor as follows: The following table lists the values of the resistor R5 to program PWM or PFM modes of operation and 1.6A or -6 C 30 x 10 x C x V SS SEL OUT 1.14A peak current limits. The soft-start time (t ) is related to the capacitor con- SS On the EV kit, jumpers JU2-JU5 are connected to each nected at SS (C ) by the following equation: SS of the above values for easy evaluation of each mode C and peak current limit. The mode of operation cannot be SS t = SS 6 changed on-the-fly after power-up until power supply is 6.25 10 reset or the IC has been disabled. For example, to program a 2ms soft-start time, a 12nF capacitor should be connected from the SS pin to SGND. Table 1. Default Jumper Settings Table 2. R Resistor vs. Modes of ILIM Operation and Peak Current Limit DEFAULT SHUNT JUMPER FUNCTION POSITION R MODE OF PEAK CURRENT LIMIT ILIM Installed, across (k) OPERATION (A) JU1 Enable for VOUT pins 2-3 OPEN PFM 1.6 JU2 Open PFM/1.6A peak ILIM 422 PFM 1.14 JU3 Open PFM/1.14A peak ILIM 243 PWM 1.6 JU4 Installed FPWM/1.6A peak ILIM 121 PWM 1.14 JU5 Open FPWM/1.14A peak ILIM Note: Only 1 jumper between JU2-5 should be installed. For 3-pin connectors, pin 1 is denoted by a silkscreen circle. Maxim Integrated 2 www.maximintegrated.com