Analog Devices Inc./Maxim Integrated MAX20457EVKIT#

Overview

MAX20457EVKIT# from Maxim Integrated is a fully assembled and tested evaluation kit designed to accelerate development and validation of the MAX20457 dual synchronous buck converter IC. It features preinstalled MAX20457ATIE/VY+ (5V/3.3V, 2.1MHz), supports 3.5V–40V input, delivers up to 3.5A on Buck1 and 2A on Buck2, and includes test points, jumpers, and automotive-grade components for rapid prototyping in vehicle power systems.

For engineers reviewing the MAX20457EVKIT# datasheet, MAX20457EVKIT# pinout, MAX20457EVKIT# application, or MAX20457EVKIT# equivalent, this kit enables fast functional verification of dual-output DC-DC regulation, PGOOD monitoring, FSYNC synchronization, EXTVCC sourcing options, and load transient response across automotive temperature ranges - all without PCB redesign.

Technical Context

The MAX20457EVKIT# implements a proven PCB layout for the MAX20457 family of current-mode-controlled dual buck converters. It supports both forced-PWM and skip-mode operation via the FSYNC pin, with external clock synchronization capability and independent EN1/EN2 control for staged power-up sequencing.

Key evaluation capabilities include adjustable output voltages (1V–14V per channel using external resistor dividers), selectable Buck2 input source (VBATTF or VOUT1), PGOOD monitoring at VOUT1/VOUT2 with 95%/93.5% threshold hysteresis, and EXTVCC jumper configuration (VOUT1, VOUT2, or GND) to bypass or enable the internal 5V BIAS LDO.

Key Specifications

Availability

MAX20457EVKIT# is available at Aetrix Electronics and suitable for automotive ADAS power supply validation, infotainment system DC-DC design, body control module development, and industrial dual-rail power architecture prototyping requiring stable component supply and RoHS-compliant evaluation hardware.

Supply support for MAX20457EVKIT# includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated, now part of Analog Devices, designs precision analog, mixed-signal, and power management ICs for automotive, industrial, and communications applications.

The MAX20457EVKIT# belongs to Maxim's automotive-grade power evaluation platform line, engineered specifically to de-risk adoption of high-voltage dual buck regulators in safety-critical and thermally constrained vehicle subsystems.

FAQ

What does the MAX20457EVKIT# evaluate?

The MAX20457EVKIT# evaluates the MAX20457 dual synchronous buck converter IC. It ships with the MAX20457ATIE/VY+ variant configured for 5V/3.3V outputs at 2.1MHz. The board supports evaluation of other MAX20457 variants-including 400kHz versions-via component changes documented in the EV Kit Bill of Materials. All onboard components are rated for automotive temperature range.

How do I configure the MAX20457EVKIT# for different output voltages?

To adjust VOUT1 or VOUT2 on the MAX20457EVKIT#, replace the factory-installed feedback resistors: remove R1 and install custom R3/R4 for VOUT1; remove R12 and install R15/R16 for VOUT2. The equations use VFB = 1V (typ) and fixed R4/R16 = 50kΩ. Default settings deliver 5V and 3.3V with ±2% accuracy. Jumper positions and test points simplify verification during reconfiguration.

Can the MAX20457EVKIT# synchronize switching frequency to an external clock?

Yes, the MAX20457EVKIT# supports external frequency synchronization via the FSYNC pin. When FSYNC is driven by an external clock signal, the MAX20457 forces PWM mode and locks its switching frequency to that source. Jumper JU4_FSYNC defaults to pull-up (FPWM mode); removing the shunt and applying an external clock to TP_FSYNC enables sync functionality - critical for EMI reduction in multi-converter systems.

What is the purpose of the EXTVCC jumper (JU5_EXTVCC) on the MAX20457EVKIT#?

The JU5_EXTVCC jumper on the MAX20457EVKIT# selects the bias supply source for the MAX20457's internal circuitry. Position 1–4 connects EXTVCC to VOUT1, bypassing the internal 5V LDO to improve efficiency. Alternatives include VOUT2 or GND (to enable the LDO). This flexibility allows optimization of power loss and thermal performance depending on system-level voltage availability and sequencing requirements.

Does the MAX20457EVKIT# support PGOOD monitoring for both outputs?

Yes, the MAX20457EVKIT# provides dedicated test points (TP_PGOOD1 and TP_PGOOD2) and pull-up jumpers (JU_PGOOD1/JU_PGOOD2) for monitoring PGOOD status of both VOUT1 and VOUT2. Each PGOOD signal asserts high-Z when its output reaches ≥95% of regulation and pulls low below 93.5%, enabling precise rail health detection. Pull-up to VBIAS via installed shunts delivers clean logic-level signals compatible with microcontroller GPIOs.