Analog Devices Inc./Maxim Integrated MAX38904CEVK#WLP

Overview

MAX38904CEVK#WLP from Analog Devices is a wafer-level package (WLP) evaluation kit for the MAX38904C low-noise LDO linear regulator, supporting adjustable 0.6V–5.0V output at up to 2A with 5.1μVRMS noise (10Hz–100kHz), ±1% DC accuracy, and 100mV max dropout at full load. It enables rapid validation of high-precision power delivery in space-constrained systems such as medical sensors and audio front-ends.

For engineers reviewing the MAX38904CEVK#WLP datasheet, MAX38904CEVK#WLP pinout, MAX38904CEVK#WLP application, or MAX38904CEVK#WLP equivalent, this evaluation kit provides verified reference design, WLP footprint compatibility, soft-start tuning via BYP capacitor, active discharge (70Ω), and full protection coverage including overcurrent, thermal shutdown, and reverse-current blocking - critical for prototyping low-noise, high-reliability 2A LDO implementations.

Technical Context

The MAX38904CEVK#WLP implements the MAX38904C variant - a PMOS-based LDO with external feedback (FB pin), factory-unprogrammed output voltage, and WLP packaging (2.2mm × 1.37mm, 5×3 bump, 0.4mm pitch). It supports programmable soft-start via BYP capacitor (1nF–100nF), delivers >70dB PSRR at 10kHz, and maintains stability with ≥8μF ceramic output capacitance.

Designed for ultra-low-noise operation, the board integrates 22μF input/output capacitors, 47nF BYP capacitor, and resistor divider placeholders (R1/R2) for precise VOUT configuration. Its layout adheres to Analog Devices' land pattern AN1891, ensuring optimal thermal performance (θJA = 61.55°C/W on 4-layer board) and minimal parasitic inductance for high-frequency transient response.

Key Specifications

Availability

MAX38904CEVK#WLP is available at Aetrix Electronics and suitable for medical instrumentation, high-resolution data acquisition, and high-end audio system development requiring stable component supply, fast evaluation turnaround, and production-ready WLP layout validation.

Supply support for MAX38904CEVK#WLP 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

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Wilmington, MA.

The MAX38904 series was designed specifically for ultra-low-noise, high-accuracy power regulation in size- and noise-sensitive applications - including precision ADC/DAC supplies, RF bias rails, and portable medical devices - where traditional LDOs fail to meet 5.1μVRMS noise or ±1% accuracy requirements.

FAQ

What is the primary function of the MAX38904CEVK#WLP evaluation kit?

The MAX38904CEVK#WLP is a hardware platform for evaluating the MAX38904C low-noise LDO regulator. It provides a fully assembled, tested PCB with correct WLP footprint, optimized decoupling, thermal layout, and configurable feedback network - enabling engineers to validate 0.6V–5.0V output regulation, soft-start behavior, noise performance, and protection features before integrating into final designs.

Does the MAX38904CEVK#WLP support the MAX38904D or MAX38904B variants?

No. The MAX38904CEVK#WLP is configured exclusively for the MAX38904C variant: it includes FB and BYP pins for external voltage setting and omits POK (absent in MAX38904C) and SELA/SELB (exclusive to MAX38904A). MAX38904D requires factory-programmed output and uses OUTS instead of FB; MAX38904B adds POK and GS pins - neither matches this board's pinout or component layout.

What are the key layout features validated by the MAX38904CEVK#WLP?

The MAX38904CEVK#WLP validates critical layout practices for WLP LDOs: short, low-inductance IN/GND/OUT traces; dedicated ground plane under the 5×3 bump die; thermal vias beneath the die pad; proper BYP capacitor placement adjacent to the BYP pin; and X5R/X7R ceramic capacitor selection meeting 8μF minimum COUT requirement with DC bias derating - all aligned with Analog Devices' AN1891 land pattern and thermal guidelines.

Can the MAX38904CEVK#WLP be used to measure output noise below 10Hz?

No. The MAX38904CEVK#WLP supports measurement of the MAX38904C's specified 5.1μVRMS noise only within the 10Hz–100kHz band, as defined in the datasheet. Sub-10Hz noise characterization requires specialized low-frequency instrumentation, additional filtering, and controlled environmental conditions beyond the scope of this evaluation kit's default configuration and component selection.

Is the MAX38904CEVK#WLP RoHS-compliant and lead-free?

Yes. The MAX38904CEVK#WLP uses RoHS-compliant components and PCB fabrication. Its supported device, the MAX38904C, is supplied in a lead(Pb)-free package denoted by the "+" suffix in ordering codes (e.g., MAX38904CANL+), and all on-board passives meet JEDEC J-STD-609A Class 1 marking standards for lead-free finish.