Analog Devices Inc./Maxim Integrated MAX38904BATD+T

Overview

MAX38904BATD+T from Analog Devices is a 2A, low-noise LDO linear regulator in a 3mm × 3mm 14-pin TDFN package, delivering ±1% output accuracy over load/line/temperature with only 47mV dropout at 2A and 5.1μVRMS output noise (10Hz–100kHz). It features adjustable 0.6V–5.0V output via external feedback resistors and an active-high POK signal for reliable power sequencing in high-precision analog systems.

For engineers reviewing the MAX38904BATD+T datasheet, MAX38904BATD+T pinout, MAX38904BATD+T application, or MAX38904BATD+T equivalent, this page provides verified technical context, validated pin functions, confirmed soft-start programmability, real-world protection behavior (overcurrent/thermal/reverse-current), and accurate alternative part comparisons - all specific to the MAX38904BATD+T variant.

Technical Context

The MAX38904BATD+T implements a PMOS-based LDO architecture with integrated 0.6V reference, enabling precise output regulation across 0.6V–5.0V using external R1/R2 feedback. Its BYP pin controls soft-start slew rate (via 1nF–100nF capacitor) and reduces output noise by filtering the internal reference path.

It includes dedicated GS (ground sense) for remote sensing, active discharge (70Ω) on shutdown, and open-drain POK with 91% VOUT threshold and 100mV VOL at 1mA - all operating across –40°C to +125°C with no external components required beyond input/output capacitors and feedback resistors.

Key Specifications

Pinout & Package

MAX38904BATD+T uses a 3mm × 3mm, 14-pin TDFN package with exposed pad (EP) for thermal management. Pin numbering follows standard top-view orientation with pin 1 at top-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A8300RGRT and LT3045EDD#PBF, the MAX38904BATD+T uniquely combines POK signaling, 0.6V–5.0V adjustability, and 5.1μVRMS noise in a compact 3mm × 3mm TDFN - making it optimal for space-constrained, sequenced, high-precision analog power rails.

Availability

MAX38904BATD+T is available at Aetrix Electronics and suitable for communication systems, high-end audio systems, and high-resolution data acquisition systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX38904BATD+T 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 since 1965.

The MAX38904 series was designed specifically for noise-sensitive analog power domains - emphasizing ultra-low output noise, tight DC accuracy, fast transient response, and robust protection in miniature packages.

FAQ

What output voltage range does the MAX38904BATD+T support?

The MAX38904BATD+T supports an adjustable output voltage range of 0.6V to 5.0V, set precisely using two external feedback resistors (R1 and R2) connected to the FB pin. Its internal 0.6V reference enables accurate scaling across this full range, and the device maintains ±1% regulation accuracy over load, line, and temperature - confirmed in the Electrical Characteristics table of the official datasheet.

Does the MAX38904BATD+T include power-good signaling?

Yes, the MAX38904BATD+T includes an active-high, open-drain POK (Power-OK) output. It asserts high when the output voltage reaches 91% of its regulated value (typical), with a guaranteed 88%–94% threshold window. The POK pin requires an external pull-up resistor and is fully functional across the –40°C to +125°C operating range - explicitly documented in the MAX38904BATD+T's Pin Description and Electrical Characteristics sections.

What is the dropout voltage of the MAX38904BATD+T at full load?

The MAX38904BATD+T has a maximum dropout voltage of 100mV at 2A load, with a typical value of 47mV when VIN = 3.6V (TDFN package). This low dropout enables efficient operation with minimal input–output differential - for example, delivering 2.5V at 2A from a 2.55V source. Dropout is specified across input voltages and temperatures in the Electrical Characteristics table.

How does the MAX38904BATD+T handle output capacitor discharge during shutdown?

When the EN pin is pulled low, the MAX38904BATD+T activates an internal 70Ω resistor between OUT and GND to rapidly discharge output capacitors. This active discharge feature reduces discharge time significantly compared to passive RC decay - critical for safe, repeatable power sequencing in multi-rail systems. The 70Ω value is confirmed in both the General Description and Electrical Characteristics sections.

What package type and thermal performance does the MAX38904BATD+T use?

The MAX38904BATD+T uses a 3mm × 3mm, 14-pin TDFN package with exposed pad (EP), achieving θJA = 41°C/W on a four-layer board. The EP must be soldered to a solid ground plane with ≥4 thermal vias to realize this rating. Thermal shutdown triggers at 165°C (rising) and releases at 150°C (falling), as specified in Absolute Maximum Ratings and Detailed Description.