Analog Devices Inc./Maxim Integrated MAX77231EVKIT#

Overview

MAX77231EVKIT# from Maxim Integrated is an evaluation kit for the MAX77231 ultra-low-noise boost regulator IC, designed to validate 11.2V/10mA low-ripple bias supply operation in space-constrained sensor and analog front-end applications. It implements a two-stage architecture: a PFM boost converter (11.7V output) followed by a PMOS linear post-regulator delivering 35µVRMS noise (1MHz BW), true shutdown, and factory-trimmable output up to 16.2V.

For engineers reviewing the MAX77231EVKIT# datasheet, MAX77231EVKIT# pinout, MAX77231EVKIT# application, or MAX77231EVKIT# equivalent, this kit enables rapid validation of ultra-low-noise power delivery, active discharge behavior, load transient response (<20mVP-P), and thermal performance in sub-7mm² layouts using 1µH inductors and 2.2µF ceramic capacitors.

Technical Context

The MAX77231EVKIT# implements the full reference circuit for the MAX77231 IC, including 1µH/400mA inductor (L1), 2.2µF/6.3V input capacitor (C1), and dual 2.2µF/25V output/bypass capacitors (C2, C3). It supports both ENM and ENS enable logic with independent active discharge control and validates the 9-bump WLP package's thermal and layout constraints.

It demonstrates the IC's current-limited PFM boost architecture with 570ns max on-time and 35ns min off-time, and verifies the PMOS LDO's 50dB PSRR at 1MHz, 0.5V headroom requirement between BST and OUT, and true 0V shutdown via load disconnect - all under -40°C to +85°C operating conditions.

Key Specifications

Availability

MAX77231EVKIT# is available at Aetrix Electronics and suitable for low-noise sensor biasing, analog front-end power validation, and portable medical device development requiring stable component supply and fast design iteration.

Supply support for MAX77231EVKIT# 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, mixed-signal, and power management ICs for demanding industrial, automotive, and consumer applications.

The MAX77231 product line targets ultra-low-noise, space-constrained bias supplies for precision sensors, RF front-ends, and medical instrumentation where ripple-sensitive analog circuitry demands <40µVRMS noise and true 0V shutdown.

FAQ

What is the primary function of the MAX77231EVKIT#?

The MAX77231EVKIT# is an evaluation kit that demonstrates and validates the full operational behavior of the MAX77231 ultra-low-noise boost+LDO regulator IC. It implements the exact reference circuit from the datasheet - including 1µH inductor, 2.2µF input/output capacitors, and dual-enable logic - to verify 35µVRMS output noise, 11.2V regulation, active discharge, and thermal performance under real-world load and temperature conditions. The MAX77231EVKIT# enables hardware validation before custom PCB design.

Does the MAX77231EVKIT# support factory-trimmed output voltages beyond 11.2V?

Yes - the MAX77231EVKIT# is configured to evaluate the MAX77231 IC's full factory-trimmable output range of 11.2V to 16.2V. While the default configuration delivers 11.2V, the kit's underlying MAX77231 IC supports higher outputs via factory programming; users can request custom-trimmed units or verify voltage-setting behavior using external feedback networks per the datasheet's trimming guidelines. The MAX77231EVKIT# provides the necessary test points and layout to confirm stability and noise performance across the entire range.

How does the MAX77231EVKIT# validate true shutdown and active discharge?

The MAX77231EVKIT# directly demonstrates true shutdown by measuring VOUT collapse to 0V when ENM is pulled low - confirming internal load disconnect. It validates active discharge by sourcing ≥15mA through the OUT pin during shutdown, verified via current-sense resistor measurements or oscilloscope observation of discharge time (≤5ms to <0.1V). The kit's dual-enable inputs (ENM and ENS) allow isolated testing of discharge-enabled vs. passive shutdown modes, as defined in Table 1 of the MAX77231 datasheet.

Can the MAX77231EVKIT# be used to assess thermal performance in compact layouts?

Yes - the MAX77231EVKIT# implements the exact 9-bump WLP (1.238mm × 1.238mm) footprint and thermal layout recommended in the MAX77231 datasheet, including optimized ground vias and low-inductance traces. It validates the IC's 533mW power dissipation limit at +70°C and 6.7mW/°C derating, enabling thermal margin analysis for end-equipment. Measured junction temperature rise under 10mA load confirms suitability for sealed or thermally constrained enclosures, as specified in the MAX77231 absolute maximum ratings.

What components are included on the MAX77231EVKIT# board?

The MAX77231EVKIT# board includes the MAX77231 IC in a 9-bump WLP package, a 1µH/400mA shielded inductor (L1), three 2.2µF ceramic capacitors (C1: 6.3V input, C2/C3: 25V output/bypass), and test points for IN, OUT, BST, LX, ENM, ENS, and GND. It features no additional ICs or microcontrollers - it is a minimal, direct implementation of the typical operating circuit shown in Figure 1 of the MAX77231 datasheet, optimized for noise and layout fidelity.