Analog Devices Inc./Maxim Integrated MAX38909EVK#WLP

Overview

MAX38909EVK#WLP from Maxim Integrated is a fully assembled and tested evaluation kit designed to characterize the MAX38908ANL+, a 4A, low-input-voltage NMOS LDO linear regulator in WLP15 (5×3 bump, 0.4mm pitch) package. It supports 0.9V–5.5V input, 2.7V–20V bias, and resistor-configurable 0.6V–5.0V output-defaulting to 1V with 1% feedback resistors-enabling validation of high-current power delivery in space-constrained applications such as portable industrial sensors.

For engineers reviewing the MAX38909EVK#WLP datasheet, MAX38909EVK#WLP pinout, MAX38909EVK#WLP application, or MAX38909EVK#WLP equivalent, this kit provides verified 4-layer PCB layout, terminal-accessible IN/BIAS/OUT/GND/POK signals, jumper-controlled enable (JU1), and configurable POK pull-up options-critical for rapid LDO performance assessment under real-world thermal and load conditions.

Technical Context

The MAX38909EVK#WLP implements the MAX38908ANL+ IC in its native WLP15 package with full signal access via banana jacks and test points. It separates input (IN), bias (BIAS), output (OUT), ground (GND), and power-ok (POK) paths, supporting independent sourcing of bias voltage ≥2V above VOUT and open-drain POK monitoring with user-selectable pull-up (default 100kΩ to VOUT).

Hardware design includes proven 1-oz copper 4-layer layout, 0402/0603/0805/1206 ceramic decoupling (C1–C5), precision 1% feedback network (R1 = 10kΩ, R2 = 15kΩ), and shuntable enable control (JU1 pins 1–2 = enabled, EN = BIAS). No additional components are required for basic operation at 1V/4A.

Key Specifications

Availability

MAX38909EVK#WLP is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered edge AI modules, and compact industrial controllers requiring stable component supply, fast prototyping cycles, and validated thermal/power integrity.

Supply support for MAX38909EVK#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

Maxim Integrated, now part of Analog Devices, designs precision analog, mixed-signal, and power management ICs for industrial, automotive, and communications applications.

The MAX38908 product line delivers high-current, low-headroom LDOs targeting space- and thermally constrained systems where traditional PMICs or switching regulators introduce noise or complexity.

FAQ

What is the primary function of the MAX38909EVK#WLP?

The MAX38909EVK#WLP is a dedicated evaluation platform for the MAX38908ANL+ 4A NMOS LDO regulator. It enables engineers to validate electrical performance-including dropout behavior, load transient response, and thermal stability-under real operating conditions using accessible terminals, configurable feedback, and integrated bias supply routing. The MAX38909EVK#WLP does not operate standalone; it requires external DC supplies for IN and BIAS inputs.

Does the MAX38909EVK#WLP include the MAX38908 IC?

Yes, the MAX38909EVK#WLP ships fully assembled with the MAX38908ANL+ installed in its WLP15 package. The board uses precision 1% resistors (R1 = 10kΩ, R2 = 15kΩ) to set the default output voltage to 1V, and all critical passive components-including input/output capacitors and bypass networks-are populated and tested prior to shipment.

Can the output voltage of the MAX38909EVK#WLP be adjusted?

Yes, the MAX38909EVK#WLP supports resistor-based reconfiguration of the output voltage from 0.6V to 5.0V by replacing feedback resistors R1 and R2. The default 1V setting follows the MAX38908 datasheet calculation: VOUT = 0.6V × (1 + R1/R2). Users must recalculate and substitute both resistors to maintain accuracy and stability per the IC's feedback requirements.

What are the power supply requirements for operating the MAX38909EVK#WLP?

The MAX38909EVK#WLP requires two independent DC sources: a 5.5V/5A supply connected to IN and GND, and a 3V–20V/10mA supply connected to BIAS and GND. The BIAS voltage must exceed VOUT by at least 2V (e.g., ≥3V for 1V output). Both supplies must be connected before enabling power to avoid damage to the MAX38908ANL+ on the MAX38909EVK#WLP.

How is the Power-OK (POK) signal implemented on the MAX38909EVK#WLP?

The MAX38909EVK#WLP provides an open-drain POK output tied to the MAX38908ANL+'s POK pin. By default, it is pulled up to VOUT via a 100kΩ resistor (R3); users may remove R3 and install a custom pull-up (10kΩ–100kΩ) to VIN or another reference. POK asserts low when output regulation is within ±3% tolerance, providing system-level fault detection without additional circuitry on the MAX38909EVK#WLP.