MAX77812EVKIT# Analog Devices

Click here for production status of specific part numbers. Evaluates: MAX77812 MAX77812 Evaluation Kit General Description Features The MAX77812 evaluation kit (EV kit) is a fully assembled 20A Maximum Output Current (5A per phase) and tested printed circuit board (PCB) that demonstrates V Range: 2.5V to 5.5V IN the MAX77812. The EV kit allows for easy evaluation of V Range: 0.250V to 1.525V with 5mV Steps OUT each feature. It supports user-programmable phase con- figuration to one of five options: 0.5% Initial Output Accuracy with Differential Sensing Single output in 4 phase configuration (default) Dual outputs in 3 + 1 phase configuration 5 User-selectable Phase Configurations Dual outputs in 2 + 2 phase configuration 91% Peak Efficiency (V = 3.8V, V = 1.1V) IN OUT Three outputs in 2 + 1 + 1 phase configuration Auto (SKIP/PWM) and Forced PWM Modes Four outputs in 1 + 1 + 1 + 1 phase configuration Enhanced Load Transient Response A Micro-B USB cable is included in the package to serve 2 as the USB to I C interface for easy testing. Windows- Programmable Ramp-up/down Slew Rates based software provides a user-friendly interface to exer- Programmable Startup/Shutdown Sequence cise the features of the MAX77812. This software offers a UVLO, Short-Circuit, and Thermal Protections graphical user interface (GUI) as well as a register-based interface. 2 User-programmable General-Purpose Inputs 2 3.4MHz High Speed I C and 30MHz SPI Interface 3.408mm x 3.368mm 64-Bumps WLP Package Ordering Information appears at end of data sheet. Figure 1. MAX77812 EV Kit Photo Windows is a registered trademark and registered service mark of Microsoft Corporation. 19-8549 Rev 7 3/19Evaluates: MAX77812 MAX77812 Evaluation Kit Note: In the following sections, software-related items Default Configurations are identified by bolding. Text in bold only refers to items V = 0.65V OUT directly from the EV kit software. Text in bold and under- I = 20A maximum OUT lined refers to items from the Windows OS. Phase/Output configuration set to 1-Output: 4-Phase Procedure (Master 1) The EV kit is fully assembled and tested. Follow the steps Chip Enable input (CE) is enabled below to verify board operation: Global Enable input (EN) is disabled 1) Identify the connections and test points shown in Global Low Power Mode input (LPM) is disabled Figure 2. Confirm all shunts and jumpers are at their default positions as indicated in Table 1. Serial Interface Selection input (I2C SPI SEL) set 2 2) Install the MAX77812 EV kit software (GUI) on to to I C your PC as instructed. Connect the Micro-B USB Default register settings cable between PC and MAX77812 EV kit. Auto SKIP/PWM mode is enabled 3) Set up the test circuit as shown in Figure 3. Preset Enhanced transient response (ETR) is enabled the DC power supply to 3.8V and current limit to 0.5A. Do not turn on the power supply until all Startup delay and shutdown delay set to 0 connections are completed. Soft start slew rate and ramp-up slew rate set to 20mV/s 4) Enable the power supply output and confirm the input current is low (< 100A). Open the MAX77812 Shutdown slew rate and ramp-down slew rate set GUI window and click on Device then Connect. If to 5mV/s the connection is successful, it displays the message Default shunt and jumper positions as shown in Table 1 Currently connected to MINIQUSB CMOD and DEVICE MAX77812. Click Read and close (Figure 4). Quick Start 5) Go to the Buck then Master 1 tab and select the Required Equipment following settings (Figure 5): Buck Master1 Output to 1 = Enabled The MAX77812 evaluation package includes: MAX77812 EV kit Buck Master1 Output Voltage to 1000mV Micro-B USB cable Click Write. MAX77812 EV kit software (GUI) 6) Verify that the voltage at V1 is approximately 1V. Adjustable DC power supply capable of supplying 12A 7) AC measurements, e.g., output ripple and load tran- Electronic load capable of sinking 20A sient can be monitored using oscilloscope at VO1S. Oscilloscope Two voltmeters Two ammeters Maxim Integrated 2 www.maximintegrated.com