Analog Devices Inc./Maxim Integrated MAX38904DEVK#WLP

Overview

MAX38904DEVK#WLP from Analog Devices is a 2A, low-noise wafer-level package (WLP) LDO linear regulator with 0.7V–5.0V factory-programmed output voltage, 5.1μVRMS output noise (10Hz–100kHz), ±1% DC accuracy over load/line/temperature, and 100mV max dropout at full load. It delivers stable power to noise-sensitive analog signal chains in high-resolution data acquisition systems.

For engineers reviewing the MAX38904DEVK#WLP datasheet, MAX38904DEVK#WLP pinout, MAX38904DEVK#WLP application, or MAX38904DEVK#WLP equivalent, this page provides verified WLP-specific electrical behavior, thermal performance on four-layer PCBs, active discharge functionality, and factory-set voltage configuration details critical for medical equipment and test instrumentation design.

Technical Context

The MAX38904DEVK#WLP implements a PMOS-based LDO architecture with internal 0.6V reference and feedback loop stabilized by external 8–22μF ceramic output capacitance. Its 70Ω active discharge path engages when EN is pulled low, enabling fast output capacitor discharge during power sequencing.

It features programmable soft-start via BYP pin (1nF–100nF capacitor sets slew rate), reverse-current protection triggered at 10mV IN-to-OUT differential, and thermal shutdown activation at 165°C junction temperature with 15°C hysteresis-ensuring robust operation in compact, thermally constrained layouts.

Key Specifications

Pinout & Package

MAX38904DEVK#WLP uses a 5 × 3 bump, 2.2mm × 1.37mm wafer-level package (WLP) with 0.4mm pitch and exposed substrate ground connection. The package is optimized for minimal footprint and thermal resistance (θJA = 61.55°C/W on four-layer board).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Compared with MAX38904DEVK#WLP, MAX38904CANL+ offers voltage adjustability at the cost of added components and layout complexity, while TPL7407LADGQR trades noise performance and advanced protection for cost efficiency-making MAX38904DEVK#WLP optimal for fixed-voltage, noise-critical, and safety-compliant applications.

Availability

MAX38904DEVK#WLP is available at Aetrix Electronics and suitable for high-resolution data acquisition systems, medical diagnostic equipment, and test & measurement instruments requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX38904DEVK#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The MAX38904 product line delivers ultra-low-noise, high-accuracy LDO regulators optimized for noise-sensitive analog signal chains in medical, test, and audio applications-emphasizing factory-programmed simplicity and WLP miniaturization.

FAQ

What is the factory-programmed output voltage of MAX38904DEVK#WLP?

The MAX38904DEVK#WLP is factory-programmed to a specific output voltage within the 0.7V–5.0V range in 50mV increments. The exact value is encoded in the suffix (e.g., "15" = 1.5V, "50" = 5.0V). Datasheet Ordering Information confirms that MAX38904DANL15+T is 1.5V and MAX38904DANL50+T is 5.0V-so MAX38904DEVK#WLP must be cross-referenced to its full part number to determine its precise programmed voltage. Always verify the voltage code before integration.

Does MAX38904DEVK#WLP include an active discharge feature?

Yes, MAX38904DEVK#WLP includes a 70Ω active discharge path from OUT to GND that engages automatically when the EN pin is pulled low. This feature rapidly discharges output capacitors during power-down, reducing system-level sequencing time and preventing unintended voltage hold-up. The discharge behavior is identical across all MAX38904 variants (A/B/C/D), including the WLP-packaged MAX38904DEVK#WLP.

Can MAX38904DEVK#WLP operate with only 8μF output capacitance?

Yes, MAX38904DEVK#WLP is stable with a minimum 8μF ceramic output capacitor (X5R/X7R dielectric recommended), as confirmed in the Electrical Characteristics table and Detailed Description section. This low minimum capacitance requirement supports compact, low-profile designs. However, 22μF is recommended for optimal transient response and noise suppression-especially in high-precision applications like data acquisition where load step rejection matters.

What is the thermal resistance (θJA) of MAX38904DEVK#WLP on a standard PCB?

The junction-to-ambient thermal resistance (θJA) of MAX38904DEVK#WLP is 61.55°C/W when mounted on a four-layer PCB, per the Package Information section. This value assumes proper thermal vias connecting the WLP substrate to internal ground planes. Unlike TDFN versions, the WLP has no exposed pad-so thermal performance relies entirely on solder joint conduction and PCB copper mass. Layout must follow Application Note 1891 land pattern guidelines to achieve rated θJA.

Is the OUTS pin on MAX38904DEVK#WLP required for basic operation?

No, the OUTS (output sense) pin on MAX38904DEVK#WLP is optional for basic operation but essential for high-accuracy regulation at the load. When left unconnected, regulation occurs at the IC's OUT pins-introducing error from PCB trace resistance. Connecting OUTS directly to the load point eliminates IR drop, ensuring ±1% accuracy is maintained at the point of use. For medical or test equipment where absolute voltage tolerance is critical, using OUTS is strongly recommended.