Analog Devices Inc./Maxim Integrated MAX38903EVKIT#TDFN

Overview

MAX38903EVKIT#TDFN from Maxim Integrated is a fully assembled and tested evaluation kit for the MAX38903A/MAX38903B 1A low-noise linear regulators in 10-pin 3mm × 3mm TDFN packages. It supports input voltages from 1.7V to 5.5V, delivers up to 1A output current, and provides resistor-configurable output voltages from 0.6V to 5.3V (default 3.3V with installed MAX38903BATB+), enabling rapid validation of power integrity in compact embedded systems.

For engineers reviewing the MAX38903EVKIT#TDFN datasheet, MAX38903EVKIT#TDFN pinout, MAX38903EVKIT#TDFN application, or MAX38903EVKIT#TDFN equivalent, this kit serves as a production-ready reference platform to verify regulator noise performance (12µV_RMS, 10Hz–100kHz), dropout behavior (100mV at 1A), and jumper-based configuration of EN, GS, and POK signals before IC integration.

Technical Context

The MAX38903EVKIT#TDFN implements a proven 2-layer, 1 oz copper PCB layout optimized for low-noise LDO evaluation. It integrates the MAX38903BATB+ IC with fixed 3.3V output via R101 (909kΩ) and R102 (200kΩ), and includes three configurable jumpers-JU101 (EN control), SELA (GS grounding for MAX38903B), and SELB (POK test point access)-to support both MAX38903A and MAX38903B evaluation modes.

When reconfigured for MAX38903A, the kit uses SELA/SELB jumpers to select output voltages from 1.2V to 5.0V without resistor changes, while retaining the same TDFN footprint and terminal post interface (IN/GND/OUT banana jacks). All critical decoupling (C101: 47nF; C102/C103: 10µF X7R) and test points (TP1, TP6, TP_GND, TP_OUT, POK) are pre-installed per Maxim's validated schematic and layout.

Key Specifications

Availability

MAX38903EVKIT#TDFN is available at Aetrix Electronics and suitable for power supply validation, LDO noise characterization, and embedded system bring-up requiring stable component supply, fast-turn prototyping, and production-grade reference design fidelity.

Supply support for MAX38903EVKIT#TDFN 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, automotive, communications, and computing applications.

The MAX38903EVKIT#TDFN belongs to Maxim's high-performance LDO evaluation platform family, engineered to accelerate qualification of ultra-low-noise, low-dropout regulators in space-constrained, noise-sensitive applications such as ADC/DAC power rails and RF subsystems.

FAQ

What ICs does the MAX38903EVKIT#TDFN evaluate?

The MAX38903EVKIT#TDFN evaluates both the MAX38903A and MAX38903B low-noise 1A linear regulators. It ships with the MAX38903BATB+ pre-installed for immediate 3.3V operation, and supports MAX38903A evaluation after U1 replacement and jumper reconfiguration per Table 4 in the user guide.

How is output voltage configured on the MAX38903EVKIT#TDFN?

The MAX38903EVKIT#TDFN supports two configuration methods: for MAX38903B, output voltage is set by replacing feedback resistors R101 and R102 (0.6V–5.3V range); for MAX38903A, output is jumper-selectable from 1.2V to 5.0V using SELA and SELB positions, eliminating resistor changes during evaluation.

What is the purpose of jumper SELA on the MAX38903EVKIT#TDFN?

On the MAX38903EVKIT#TDFN, jumper SELA connects the Ground Sense (GS) pin of the MAX38903B to GND, which stabilizes output regulation under varying load conditions. This connection is mandatory for stable operation of the MAX38903B and is implemented via shunt position 2–3 per Table 2 in the documentation.

Can the MAX38903EVKIT#TDFN be used to measure output noise performance?

Yes, the MAX38903EVKIT#TDFN is designed for accurate noise measurement: it includes low-inductance ceramic decoupling (C101, C102, C103), dedicated test points (TP1, TP6, TP_GND), and a validated 2-layer layout that preserves the 12µV_RMS (10Hz–100kHz) noise specification of the MAX38903BATB+ under real operating conditions.

Does the MAX38903EVKIT#TDFN include hardware for enabling/disabling the regulator?

Yes, the MAX38903EVKIT#TDFN includes jumper JU101 to control the EN (enable) pin of the MAX38903A/B. With shunt in position 1–2, EN is tied to IN for default operation; position 2–3 ties EN to GND to disable the regulator - allowing safe power sequencing and standby mode verification without external circuitry.