Click here to ask about the production status of specific part numbers. Evaluates: MAX20812 MAX20812 Evaluation Kit General Description Benefits and Features The MAX20812 evaluation kit (EV kit) is a reference 2.7V to 16V Input Voltage Range platform designed for the evaluation of the MAX20812, 0.5V to 5.8V Output Voltage Range a dual-output, compact, low-cost, fully integrated, highly High Efficiency and Power Density efficient, step-down DC-DC switching regulator IC. The IC is available in a 21-pin, 3.5mm x 4.6mm, 0.5mm pitch, Low Component Count FC2QFN package. This EV kit can deliver up to 6A load Dual-Output or Single-Output Dual-Phase Operation per output. The two outputs can be connected as a single- Optimized Performance output, dual-phase regulator that supports up to 12A load Proven PCB Layout current. Refer to the MAX20812 IC data sheet for more information. Fully Assembled and Tested The EV kit comprises a fully assembled and tested PCB Ordering Information appears at end of data sheet. implementation of the MAX20812. Jumper pins, test points, and input/output connectors are included for flex- ibility and convenience in a wide range of applications. MAX20812 EV Kit Board 319-100620 Rev 1 3/21Evaluates: MAX20812 MAX20812 Evaluation Kit and install a 0 resistor in R34 to pull SNSP2 to Quick Start AVDD. Required Equipment 4) Use the same inductors for L1 and L2, or replace MAX20812 EV Kit them with one two-phase couple inductor. 2.7V to 16V Power Supply with Optional 3.3V 5) Repeat steps 16 from the dual-output operation pro- External Power Supply cedure. 0 to 12A Load Operation Digital Voltmeters EV Kit Interface Oscilloscope and Probes The MAX20812 IC is a monolithic, dual-output, high- Procedure frequency, step-down switching regulator optimized for The EV kit is fully assembled and tested, and is preset applications requiring small size and high efficiency. with MAX20812 dual-output operation, having 1V on rail 1 Detailed product and application information is provided and 1.8V on rail 2. Use the following steps to verify board in the MAX20812 IC data sheet. operation. Output Enable (OE) For dual-output operation: OE is used to enable/disable the output voltage. For dual- 1) Connect a powered-off 2.7V to 16V input supply to J5 output operation, rail 1 output voltage is enabled/disabled (positive terminal) and J8 (negative terminal). Optionally, by SW1 and rail 2 output voltage is enabled/disabled by connect supply sense leads to TP5 (positive sense) SW2. For single-output dual-phase operation, EN1 is and TP6 (negative sense) for best accuracy. If external used and EN2 can be disconnected. bias is preferred, connect a powered-off 3.3V power supply to J32 (positive terminal) and J33 (negative ter- Output-Voltage Selection minal) with jumper J34 installed. The MAX20812 EV kit is set up to initially boot up to an 2) Connect the load to edge connector J12 for rail 1 or output voltage of 1V of rail 1 and 1.8V of rail 2. The device J13 for rail 2 (positive on the top and negative on the has a fixed 0.5V reference voltage, and the output volt- bottom). age is accomplished by placing a voltage-divider in the feedback path. 3) Connect the V scope probe/voltmeter to J2 for rail OUT 1 or J3 for rail 2. V = V x (1 + R /R ) OUT REF FB1 FB2 4) Turn on the power supply. where: 5) Position the SW1 or SW2 toggle switch to enable the IC. V = Output voltage OUT 6) Observe that V = 1V and V = 1.8V. V = 0.5V fixed reference voltage OUT1 OUT2 REF 7) For efficiency measurements, TP5 and TP6 will R = Top divider resistor FB1 be used to measure V J2 and J3 will be used to IN R = Bottom divider resistor FB2 measure V and V . OUT1 OUT2 Soft-Start For dual-phase operation: When VDDH and EN are above their rising thresholds, 1) When configured to dual-phase operation, only the soft-start begins, and switching is enabled. The soft-start control loop for rail 1 will work and the control loop ramp time is 3ms. The device supports smooth startup for rail 2 is bypassed. EN1 and PGOOD1 are used in with the output prebiased. dual-phase operation mode to enable the device and indicate power good status. EN2 and PGOOD2 can Switching Frequency be disconnected. Switching frequency is programmableparameters and 2) Install a 0 resistor for R2, R44, R45, and R48 to PGM0 are used to select the switching frequency. For the short two rail outputs. EV kit, the switching frequency is set to 1000kHz for rail 1 and 2000kHz for rail 2. Refer to the PGM0 Configurations 3) Remove R13 for rail 2 to disconnect the sense line, table (Table 1) in the MAX20812 IC data sheet. Maxim Integrated 2 www.maximintegrated.com