Click here to ask about the production status of specific part numbers. Evaluates: MAX20429 MAX20429 Evaluation Kit General Description Quick Start The MAX20429 evaluation kit (EV kit) is a fully assembled Required Equipment and tested application circuit for the MAX20429: a high- MAX20429 EV kit efficiency independent phase dual 6A low-voltage buck 5V, 5A DC power supply (PS1) converter. The EV kit is created with automotive grade components and can test each of the outputs to full 2x Digital Multimeters (DMM) load. Various test points and jumpers are included for Electronic load, 30W capable (EL1) evaluation. The standard EV kit comes with the MAX20429CAFNA/VY+ installed, which is factory config - Procedure ured for a resistor adjustable output voltage. The default The EV kit is fully assembled and tested. Follow the steps EV kit resistor divider is bypassed with an output voltage below to verify board operation: of 0.6V on both V and V . OUT1 OUT2 1) Verify that all jumpers are in their default positions, as shown in Table 1. Features 2) Connect the PS1 positive terminal to V and PS1 SUP Single Supply Operation with 3.0V to 5.5V Input negative terminal to PGND1 on the EV kit. Supply Range 3) Set DMM1 to measure Volts, DC and connect probes Individual Factory Programmable Output Voltages to V and PGND on the EV kit. OUT1 Available from 0.5V to 3.8V 4) Set DMM2 to measure Amps, DC and connect in se- Resistor Adjustable Output Voltage ries between V and EL1. Individual Output Current Up to 6A OUT1 5) Set PS1 to 5V and enable supply output. 1% Output Voltage Accuracy Frequency-Synchronization Input 6) Verify that the DMM1 measures approximately 0.6V. Individual Enable Inputs 7) Set EL1 to 6A and enable load. Individual RESET Outputs 8) Verify that the DMM1 measures approximately 0.6V while DMM2 measures approximately 6A. Jumpers and Test Points on Key Nodes for Simplified Evaluation 9) Repeat steps 3 through 8 on V , verifying DMM1 OUT2 measures approximately 0.6V at 0A load and 6A load. -40C to 125C Automotive Temperature Range 10) EV kit operation verification is complete. Automotive Grade External Components Proven PCB Layout Fully Assembled and Tested Ordering Information appears at end of data sheet. Table 1. Default Jumper Settings JUMPER SHUNT POSITION FUNCTION J1 1-2 Enable buck controller 1 (EN1) J2 1-2 Enable buck controller 2 (EN2) J3 Installed Pull-up to V for RESET1 SUP J4 Installed Pull-up to V for RESET2 SUP J5 1-2 SYNC pulled to V enabling forced pulse-width modulation (FPWM) mode SUP 319-100524 Rev 0 12/20Evaluates: MAX20429 MAX20429 Evaluation Kit period after the corresponding output returns to its Detailed Description regulated voltage. The fixed timeout period is selectable Synchronization (SYNC) between 0.5ms, 3.7ms, 7.4ms, or 14.9ms. Refer to the A logic-high on SYNC enables fixed-frequency, forced MAX20429 IC data sheet for specific part details. To PWM mode. In FPWM mode the converter switches at obtain a logic signal, place a resistor pull-up between the a constant frequency with variable on-time. Apply an RESET pins to the system I/O voltage. external clock on the SYNC input to synchronize the Resistor Adjustable Output Option internal oscillator to an external clock. The SYNC MAX20429 features an adjustable output option where input accepts signal frequencies in the range of 1.9MHz < f < 2.3MHz when f = 2.1MHz, and output voltage can be set by external resistors in addition SYNC SW to the factory programmed V options. Desired output 2.9MHz < f < 3.6MHz when f = 3.2MHz. When OUT SYNC SW the pin is open-circuited or logic-low, the SYNC input voltage can be calculated using the following method: enables the device to enter a low-power skip mode under light-load conditions if the IC is configured to allow that Output 1: V = (R + R )/R x 0.6V OUT 8 9 9 behavior. Enable Input (EN1, EN2) Output 2: V = (R + R )/R x 0.6V OUT 10 11 11 The enable control input EN1/EN2 activates the device channel from its low-power shutdown state. EN1/EN2 have an input high threshold of 1.5V (typ), an input-low See Figure 1 and Figure 2 of the MAX20429 EV kit sche- threshold of 0.5V, and a hysteresis of 50mV (typ). When matics for location of the available resistor footprints. an enable input goes high the output voltage ramps up Evaluating Other Variants according to the factory programmed soft-start time. The MAX20429EVKIT comes installed with the When an enable input goes low the output voltage MAX20429CAFNA/VY+ variant. ramps down with the soft-start time or enters a Hi-Z state depending on the device option selected. Maxim Integrated offers factory programming of preset output voltages from 0.5V to 3.8V, and an adjustable RESET Output output option. If selecting a different device variant, the The device features open-drain RESET outputs that output inductor and capacitor components may need assert low when the corresponding output voltage is out- to be modified for optimal performance. Refer to the side of the OV/UV window. The OV/UV comparators run MAX20429 IC data sheet for specific part details regard- from a separate reference to provide drift detection on ing component selection and contact factory to request the outputs. RESET remains asserted for a fixed timeout any additional variants. Ordering Information PART TYPE MAX20429EVKIT EV Kit Denotes RoHS compliance. 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