Analog Devices Inc./Maxim Integrated MAX20735EVKIT#

Overview

MAX20735EVKIT# from Maxim Integrated is an evaluation kit for the MAX20735 fully integrated 40A step-down switching regulator, designed to validate high-efficiency point-of-load power delivery under real-world conditions including VDDH = 12V, VOUT = 1V, and fSW = 400kHz. It implements valley current-mode control, supports differential remote sensing, and delivers 90.7% peak efficiency with fast transient response up to 300A/μs.

For engineers reviewing the MAX20735EVKIT# datasheet, MAX20735EVKIT# pinout, MAX20735EVKIT# application, or MAX20735EVKIT# equivalent, this kit enables rapid characterization of thermal performance, startup timing, OCP/OTP behavior, and system-level efficiency across output voltages from 0.6484V to 5.5V in networking, server, and telecom power designs.

Technical Context

The MAX20735EVKIT# implements a monolithic buck converter architecture with integrated high- and low-side MOSFETs, gate drivers, precision DAC reference, and proprietary valley current-mode PWM control. It supports programmable soft-start (1.5ms or 3ms), STAT blanking (125μs or 2ms), and switching frequency selection (400–900kHz) via external R/C on PGM pins.

Key validation capabilities include differential remote-sense accuracy with open-circuit detection, hiccup-mode overcurrent protection with programmable thresholds (16.3A–45.5A), and thermal shutdown at 130°C or 150°C. The board uses a four-layer 2oz copper PCB matching Maxim's reference layout for reliable SOA testing at up to 40A load with no heatsink.

Key Specifications

Availability

MAX20735EVKIT# is available at Aetrix Electronics and suitable for networking equipment, server power subsystems, and telecom infrastructure requiring stable component supply and repeatable lab validation of high-current POL regulators.

Supply support for MAX20735EVKIT# 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 high-performance analog and mixed-signal ICs for power, sensing, and communication applications, with emphasis on integration and reliability.

The MAX20735 product line targets compact, high-efficiency point-of-load regulation in space-constrained systems such as datacom switches, AI accelerators, and storage controllers - delivering full 40A capability in a 15-pin FCQFN package.

FAQ

What is the primary purpose of the MAX20735EVKIT#?

The MAX20735EVKIT# is a fully assembled evaluation platform for the MAX20735 40A integrated step-down regulator. It enables engineers to verify startup behavior, efficiency curves, thermal performance, transient response, and protection features - all using the exact component values and PCB layout specified in Maxim's reference design (Table 8, Rev 1 datasheet).

Does the MAX20735EVKIT# support remote voltage sensing?

Yes, the MAX20735EVKIT# implements differential remote sensing using VSENSE+ and VSENSE− pins as defined in the MAX20735 IC datasheet. The board includes Kelvin traces to the load point, enabling accurate regulation under high-current conditions and supporting open-circuit fault detection per the IC's built-in functionality.

Can the MAX20735EVKIT# be used to evaluate multiple output voltages?

Yes - the MAX20735EVKIT# supports output voltages from 0.6484V to 5.5V by changing the feedback resistor divider and programming capacitor values per Table 8 of the datasheet. Each configuration (e.g., 1V, 1.2V, 1.8V, 3.3V, 5V) has validated component values and corresponding efficiency/thermal data.

What thermal performance can be expected from the MAX20735EVKIT# at full load?

At 40A output with VDDH = 12V and VOUT = 1V, the MAX20735EVKIT# achieves a junction-to-ambient thermal resistance (θJA) of 12°C/W under still-air, no-heatsink conditions. Measured junction temperature reaches ~100°C at TA = 25°C, staying within the MAX20735's 125°C operating limit per the SOA curves in the datasheet.

How is overcurrent protection configured and tested on the MAX20735EVKIT#?

Overcurrent protection on the MAX20735EVKIT# is configured via R_SEL3 resistors connected to PGM3, selecting thresholds from 16.3A to 45.5A (Setting 0–3). Testing confirms hiccup-mode response with cycle-by-cycle valley-current limiting, validated using the board's onboard current-sense shunt and load-step transients per the datasheet's typical operating characteristics.