Click here for production status of specific part numbers. Evaluates: MAX20048 MAX20048 Evaluation Kit General Description Quick Start The MAX20048 evaluation kit (EV kit) is a fully assembled Required Equipment and tested application circuit for the MAX20048 current- MAX20048 EV kit mode buck-boost controller IC. The EV kit is designed to 2V to 36V, 20A power supply capable of providing deliver up to 16A (max) input current with input voltages 20A at 2V input from 2V to 36V. The output-voltage accuracy is 2% within the normal 9V to 18V operation input range and a 3% Voltmeter accuracy in the 2V to 18V range. Voltage quality can be Electronic load monitored by observing the PGOOD signal. Procedure The IC offers 5V fixed output voltage and a 4V to 25V OUT The MAX20048 EV kit is fully assembled and tested. programmable range. Switching frequency is adjustable Follow the steps below to verify board operation: from 220kHz to 2.2MHz, which allows for small external components, reduced output ripple, and guarantees no 1) Verify that all jumpers are in their default AM interference. The IC automatically enters skip mode at positions, as shown in Table 1. light loads with low 55A quiescent current at no load. The 2) Connect the positive and negative terminals of the IC comes with a spread-spectrum frequency-modulation power supply to IN and GND test pads, respectively. option designed to minimize EMI-radiated emissions and 3) Set the power-supply voltage to 14V and 10A current a SYNCOUT option that outputs 180 out-of-phase clock. limit. Benefits and Features 4) Connect the positive terminal of the voltmeter to OUT 2V to 36V Input Supply Range and the negative terminal to GND2. Delivers Up to 16A Input Current 5) Turn on the power supply. Enable Input 6) Verify that OUT is approximately 12V. Frequency Synchronization Input Additional Evaluation Voltage-Monitoring PGOOD Output 7) Connect the positive terminal of the electronic load to BIAS Voltage-Monitoring Test Point OUT and the negative terminal to GND2. Fully Assembled and Tested 8) Set the electronic load to 2A and turn on the load. Proven PCB Layout 9) Verify output voltage on the voltmeter is 12V 2%. 10) With the load still on, slowly reduce the input voltage from 14V to 8V. Verify output voltage on the voltmeter is 12V 2% Ordering Information appears at end of data sheet. Table 1. Default Jumper Settings DEFAULT SHUNT JUMPER FUNCTIONS POSITION EN ON-Middle Buck-boost enabled PGOOD pulls up to PGOOD PU Installed VBIAS when OUT is in regulation SYNC FPWM-Middle Forced-PWM mode 319-100235 Rev 0 8/18Evaluates: MAX20048 MAX20048 Evaluation Kit Evaluating Other Voltages Detailed Description of Hardware The EV kit comes installed with the MAX20048ATGCA/ The MAX20048 EV kit provides a proven layout for the VY+ and is configured for 12V at a 420kHz switching MAX20048 buck-boost controller IC. The IC accepts input OUT frequency set for 16A (max) input current in boost mode. voltage as high as 36V and can deliver high-load currents, For evaluating other configurations, refer to the Design with a 20A (max) input current in boost mode. The EV kit Example table in the MAX20048 IC data sheet. Other IC can handle an input-supply transient up to 40V. Various options for spread spectrum/SYNCOUT can be installed test points are included for evaluation. The EV kit comes as well. installed with a 3m current-sense resistor on the input (R1) and a 4m sense resistor on the output (R2). This EMC Performance sets the input current limit to 16.67A and the runaway EV kit provides a proven layout that is compliant with current limit to 18.75A. A higher current limit can be set CISPR-25 requirements for EMC testing. The default by changing the sense resistors. An optional filter input EV kit (12V , 420kHz configuration, without spread OUT (IN FILTER) is provided to test designs with an additional spectrum) requires no additional filtering to meet the input filter. The default EV kit comes with no filter installed, CISPR-25 EMC standards. The IC also comes with the so input terminal IN must be used. spread-spectrum option, which can be ordered to improve External Synchronization EMC performance. The IC can operate in fixed-PWM (FPWM) mode or skip Specifications Summary mode. The EV kit comes with a default jumper setting of V (min): 2V IN FPWM. To enable skip mode operation, change the jumper to Skip-Middle. The IC can be synchronized to an external V (max): 36V IN clock by connecting the external clock between the middle V : 12V OUT and ground pins on the SYNC jumper. The IC is forced to f : 420kHz SW operate in FPWM mode when SYNC is connected to a I (max): 5A clock source. OUT Input Current: 16.67A peak current Output Monitoring (PGOOD) Runaway Current: 18.75A peak current The EV kit provides a power-good output test point (PGOOD) to monitor the status of the buck output (OUT). SPS: Off PGOOD is an open-drain output and is high impedance FSYNC: Jumper set to PWM (default) when the output voltage is in regulation. PGOOD is low impedance when the output voltage drops below 92% Ordering Information (typ) of its nominal regulated voltage. To obtain a logic PART TYPE signal, pull up PGOOD to BIAS by installing a shunt on the PGOOD jumper. MAX20048EVKIT 12V Output/420kHz EV kit Denotes RoHS-compliant. Maxim Integrated 2 www.maximintegrated.com