Analog Devices Inc./Maxim Integrated MAX38640EVKIT#WLP

Overview

The MAX38640EVKIT#WLP from Maxim Integrated is a fully assembled and tested evaluation kit designed to characterize the MAX38903A and MAX38903B ultra-low-noise 1A linear regulators in wafer-level package (WLP) form. 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 low-noise power delivery in space-constrained applications such as portable medical sensors and high-precision ADC/DAC supplies.

For engineers reviewing the MAX38640EVKIT#WLP datasheet, MAX38640EVKIT#WLP pinout, MAX38640EVKIT#WLP application, or MAX38640EVKIT#WLP equivalent, this kit enables hands-on assessment of EN control, GS grounding, POK monitoring, output voltage reconfiguration via feedback resistors or jumpers, and thermal performance under load - all on a proven 2-layer PCB layout optimized for minimal noise and compact footprint.

Technical Context

The MAX38640EVKIT#WLP implements a complete test platform for the MAX38903A/B family, featuring three configurable jumpers (JU101 for EN enable/disable, SELA for GS grounding, SELB for POK access) and dual output configuration methods: resistor-based (for MAX38903B, 0.6V–5.3V) and jumper-based (for MAX38903A, 1.2V–5.0V). The board includes banana jack terminals for IN, OUT, and GND, plus dedicated test points for TP_IN, TP_OUT, TP_GND, and POK signal monitoring.

It integrates a pre-installed MAX38903BATB+ in TDFN-10 (3mm × 3mm), but is explicitly designated for WLP evaluation per its part number suffix - indicating compatibility with wafer-level packaged variants of the same regulator family. The BOM confirms use of low-ESR ceramic capacitors (C101: 0.047µF X7R; C102/C103: 10µF X7R), precision feedback resistors (R101: 909kΩ; R102: 200kΩ), and a 2-layer 1 oz copper PCB layout validated for low-noise LDO operation.

Key Specifications

Availability

MAX38640EVKIT#WLP is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered IoT edge nodes, and high-resolution analog front-end development requiring stable component supply, fast prototyping cycles, and validated low-noise power design practices.

Supply support for MAX38640EVKIT#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 demanding industrial, medical, and communications applications.

The MAX38903 product line targets ultra-low-noise, high-PSRR power regulation in size- and noise-sensitive systems - specifically engineered for powering RF transceivers, high-speed ADCs/DACs, and precision sensor signal chains where 12µV_RMS noise (10Hz–100kHz) and 100mV dropout at 1A are critical.

FAQ

What ICs does the MAX38640EVKIT#WLP evaluate?

The MAX38640EVKIT#WLP evaluates the MAX38903A and MAX38903B ultra-low-noise 1A linear regulators. Though labeled with "WLP" in its part number, the kit ships with the MAX38903BATB+ in TDFN-10 package and supports WLP-compatible evaluation through its universal layout and jumper-based configuration options. It is not limited to one package type and accommodates both TDFN and WLP variants of the MAX38903 family per Maxim's documentation.

How do I configure the output voltage on the MAX38640EVKIT#WLP?

For the pre-installed MAX38903BATB+, adjust output voltage by replacing feedback resistors R101 and R102 to set values between 0.6V and 5.3V. For MAX38903A evaluation, replace U1 and use jumpers SELA and SELB per Table 4 to select discrete outputs from 1.2V to 5.0V. Jumper positions are documented in the MAX38640EVKIT#WLP user guide, and default settings yield 3.3V output.

Does the MAX38640EVKIT#WLP support enable and power-ok monitoring?

Yes. The MAX38640EVKIT#WLP supports EN control via jumper JU101 (positions 1–2 = enabled, 2–3 = disabled) and POK monitoring via jumper SELB: removing the shunt exposes the POK test point. These functions are fully routed and accessible, allowing real-time validation of startup sequencing, fault signaling, and system-level power management using the MAX38640EVKIT#WLP.

What is the role of the GS (Ground Sense) pin on the MAX38640EVKIT#WLP?

The GS (Ground Sense) pin stabilizes output regulation under varying load conditions for the MAX38903B. On the MAX38640EVKIT#WLP, jumper SELA connects GS to ground when set to position 2–3 - the required configuration for stable operation. Leaving SELA unshunted or incorrectly configured risks output instability, making proper GS connection essential during MAX38640EVKIT#WLP evaluation of the MAX38903B.

Is the MAX38640EVKIT#WLP fully assembled and tested before shipment?

Yes. The MAX38640EVKIT#WLP is shipped fully assembled and factory-tested. It includes the MAX38903BATB+ installed, all passive components placed (including C101, C102, C103, R101–R103), and jumpers JU101, SELA, and SELB pre-set to default positions. No soldering or component placement is required to begin evaluating regulator performance, noise, PSRR, or transient response with the MAX38640EVKIT#WLP.