Click here for production status of specific part numbers. Evaluates: MAX20430 MAX20430 Evaluation Kit General Description Quick Start The MAX20430 evaluation kit (EV Kit) is a fully assembled Required Equipment and tested application circuit for the MAX20430 high-effi- MAX20430 EV Kit ciency four-output PMIC. The EV kit can test all outputs 2 I C read/write software such as SimpleI2C to full load within the normal operating input range of 3.5V 2 to 36V. The IC features two modes of watchdog opera- I C interface such as MINIQUSB or MAX32625PICO tion, challenge/response and simple windowed mode, (PICO board) 2 which can also be disabled for simplified evaluation. I C DC power supply (capable of 0-36V output) communication must be used to configure the MAX20430 2 Digital multimeters (DMM) and monitor errors. A PC-to-I C interface (such as the MINIQUSB or MAX32625PICO) and software for read- Electronic load 2 ing and writing to I C registers (such as SimpleI2C) may Procedure simplify testing. Note: In the following sections, software-related items Benefits and Features are identified by bolding. Text in bold refers to items Integrated IC Minimizes Board Area and Layout directly from the EV kit software. The MAX20430 EV kit is fully assembled and tested. Input Voltage Range from 3.5V to 36V Follow the steps below to verify board operation: 2 User-Programmable Settings through I C 1) Verify that all jumpers are in their default configura - Challenge/Response or Simple Windowed Watchdog tion according to Table 2. 2.1MHz Fixed-Frequency Switching with Spread- 2) If using the MINIQUSB, connect the USB cable from Spectrum Option the PC to the MINIQUSB board and then plug it into 2 Status Monitoring through RESET Pin and I C Status J1 on the EV kit. If using the PICO board, separate Registers cables must be used to connect the SDA, SCL, Fully Assembled and Tested GND, and V pins to the EV kit. DD Proven PCB Layout with Automotive-Grade 3) Connect the positive and negative terminals of the power supply to V and PGND test pads, respec- Components SUP tively. 4) Set the power-supply voltage to 13.5V and then turn on the power supply. Ordering Information appears at end of data sheet. 5) If using SimpleI2C, open the software and load in the register map for MAX20430 by selecting Regmap in the menu bar, then Load Regmap. Check and en- able Auto Read on the left menu bar. 6) To establish connection to the EV kit, select Device in the menu bar, then Scan for Address. The soft- ware should find the default address (0x70). Click OK. 319-100501 Rev 0 3/20Evaluates: MAX20430 MAX20430 Evaluation Kit 2 7) The default operation of MAX20430 has Packet Error I C Communication and PEC 2 Checking (PEC) enabled. To send I C command with The MAX20430 EV kit is designed to be used with an PEC, select Settings in the menu bar, then PEC, 2 I C interface such as the MINIQUSB or MAX32625PICO 8 2 then the CRC-8, X + X + X + 1 option. board and PC software that can read and write to the 8) The default MAX20430 has the watchdog disabled. device (such as SimpleI2C). The IC has a packet-error If watchdog time is enabled in the part, it can be checking (PEC) feature that is enabled by default. This disabled by setting WDCFG2 (0x14) register bit 3 option can be disabled through CONFIG1 register 0x01, (WD EN) to 0. bit 0 (PECE). In order to write to a register when the PEC 2 is enabled, the I C transaction must be followed by a PEC 9) Connect the electronic load across OUT1 and PGND1. byte. The SimpleI2C software simplifies this process by 10) Enable the load to output and increase the current to providing a PEC enable setting. 500mA. Verify that OUT1 is still approximately 3.3V. Saving and Loading Temporary Configuration 11) Repeat for other channels with load current of interest. With SimpleI2C, the register settings can be exported Detailed Description of Hardware under File > Export Script. This file can be loaded back to the software at any time by selecting File > Run Script. (or Software) During an evaluation, the IC can be restarted with a tem- Detailed Description porary register configuration by using the 0x06 PORRST The MAX20430 EV kit provides a proven layout for evalu- register, which removes the need to fully cycle the power. ating the MAX20430 small, high-efficiency, four-output This way, start-up features such as sequencing and PMIC. The input-output range is shown in Table 1. watchdog timings can be evaluated without switching the IC to a different variant. Table 1. Default Jumper Settings 2 Workflow for I C Configuration CHANNEL INPUT OUTPUT To effectively set up the device, it is recommended that OUT1 3.5V-36V 3.3V/2.5A watchdog and PEC are initially disabled while other set- OUT2 OUT1 1.2V/3A (default) tings are evaluated. The first item to consider is the output voltages of each channel and the power-up sequencing OUT3 OUT1 5V/500mA (FPS). OUT4 OUT1 1.0V/3A (default) For detailed information on each register, please refer to the MAX20430 IC datasheet. Table 2. Default Jumper Settings JUMPER DEFAULT SHUNT POSITION FUNCTIONS EN - J3 Short IC enable VDD - J4 Open Onboard 3.3V SCL/SDA pullup MD1 - J7 Short to GND Mount ID detection (optional) MD2 - J8 Short to GND Mount ID detection (optional) Short to BIAS for 2.1MHz switching frequency. Connect to external SYNC - J2 Short clock input for different switching frequency. IN5 - J5 Short to GND IN5 comparator input IN6 - J6 Short to GND IN6 comparator input Ordering Information PART TYPE MAX20430EVKIT EV Kit MAX20430EVKITSYS EV Kit and MAX32625PICO Denotes RoHS compliant. Maxim Integrated 2 www.maximintegrated.com