Analog Devices Inc./Maxim Integrated MAX831EVKIT-SO

Overview

MAX831EVKIT-SO from Maxim Integrated is an evaluation kit for the MAX831 fixed 5V, 1A step-down DC-DC regulator IC. It implements a classic buck topology with internal 1A bipolar power switch, 100kHz PWM oscillator, and cycle-by-cycle current limiting. Designed for high-voltage input (8V–30V) distributed power applications, it delivers regulated 5V output at up to 1A continuous load.

For engineers reviewing the MAX831EVKIT-SO datasheet, MAX831EVKIT-SO pinout, MAX831EVKIT-SO application, or MAX831EVKIT-SO equivalent, this page provides verified hardware configuration details, thermal design guidance, supported regulator variants (MAX831/MAX832/MAX833), and direct links to functional evaluation circuitry and layout best practices.

Technical Context

The MAX831EVKIT-SO implements the MAX831 regulator in a 16-pin wide SO package with fixed 5V output, 100kHz switching frequency, and internal current-limit control via ILIM pin. It uses external components including a 100µH inductor (CoilCraft DO3316-104), MBR350 Schottky diode, 100µF input capacitor, and 470µF output capacitor.

Thermal management relies on low-thermal-resistance PCB mounting: 1 oz. copper ground plane with thermal paste yields θ_JA = +55°C/W, enabling safe operation up to T_J = +125°C. Shutdown is controlled by pulling the SHUT pin low; VC pin supports external compensation and TTL synchronization (115–170kHz).

Key Specifications

Availability

MAX831EVKIT-SO is available at Aetrix Electronics and suitable for distributed power design validation, high-current step-down prototyping, and multiple-output buck converter development requiring stable component supply and documented thermal performance data.

Supply support for MAX831EVKIT-SO 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 industrial, communications, and computing applications.

The MAX830–MAX833 product line delivers monolithic, high-current buck regulators targeting high-voltage input-to-lower-voltage conversion where minimal external components and robust fault protection are required.

FAQ

What is the primary function of the MAX831EVKIT-SO?

The MAX831EVKIT-SO is an evaluation kit designed to demonstrate and validate the operation of the MAX831 fixed 5V, 1A step-down DC-DC regulator. It provides a fully assembled, tested reference circuit with documented layout, thermal guidelines, and component values-enabling rapid prototyping of buck converter designs using the MAX831 or compatible variants (MAX832/MAX833). The MAX831EVKIT-SO supports input voltages from 8V to 30V and delivers stable 5V output at up to 1A.

Does the MAX831EVKIT-SO support other regulator variants besides MAX831?

Yes, the MAX831EVKIT-SO is compatible with the MAX832 (3.3V output) and MAX833 (3V output) as well as the adjustable-output MAX830. All four devices share identical pinouts, package (16-pin wide SO), and operating circuit topology. Output voltage selection requires only changing the feedback divider (for MAX830) or confirming SENSE connection (for MAX831–MAX833); no board redesign is needed. The MAX831EVKIT-SO documentation explicitly references all four parts in its typical operating circuits and applications section.

What thermal considerations apply when using the MAX831EVKIT-SO?

The MAX831EVKIT-SO achieves θ_JA = +55°C/W only when mounted on 1 oz. copper with thermal paste between the IC and underlying ground plane. Exceeding T_J = +125°C risks permanent damage. Safe continuous load current depends on ambient temperature, input/output voltage, and PCB copper area-Tables 1 and 2 in the MAX831EVKIT-SO datasheet define maximum allowable I_LOAD. For example, at T_A = +70°C and V_IN = 30V, the MAX831EVKIT-SO supports ≤0.8A continuous output with proper thermal design.

How is shutdown implemented on the MAX831EVKIT-SO?

Shutdown on the MAX831EVKIT-SO is controlled via the SHUT pin (Pin 9), which must be pulled low (<0.1V) to disable switching and reduce quiescent current to ~50µA. Leaving SHUT floating enables normal operation. This signal is directly routed from the MAX831 IC on the board and accessible via test points or headers. The MAX831EVKIT-SO schematic confirms SHUT connects to an external pull-up resistor and optional control interface, matching the absolute maximum rating that SHUT voltage must not exceed VIN.

Is the MAX831EVKIT-SO recommended for new designs?

No-the MAX831EVKIT-SO is Not Recommended for New Designs per Maxim's official notice. It was manufactured using a discontinued wafer process, and while the kit remains available for existing users and legacy validation, Maxim recommends evaluating replacement solutions or industry second-sources. The MAX831EVKIT-SO datasheet remains published for reference, but long-term supply and technical support are limited. Engineers designing new systems should consult Analog Devices' current portfolio for modern alternatives with extended lifecycle assurance.