Analog Devices Inc./Maxim Integrated MAX38902BATA+T

Overview

MAX38902BATA+T from Analog Devices is a low-noise, 500mA LDO linear regulator in an 8-pin TDFN package, delivering 10.5µVRMS output noise (10Hz–100kHz), ±1% DC output accuracy over load/line/temperature, and only 100mV max dropout at full load (3.6V_IN). It features resistor-adjustable output (0.6V–5.3V), active-low POK output, programmable soft-start, and 800Ω active discharge - ideal for powering sensitive analog circuitry in high-resolution data acquisition systems.

For engineers reviewing the MAX38902BATA+T datasheet, MAX38902BATA+T pinout, MAX38902BATA+T application, or MAX38902BATA+T equivalent, key selection criteria include its ultra-low noise floor, POK functionality for system reset sequencing, input-to-output reverse-current protection, and compatibility with minimal 2µF ceramic output capacitance under industrial temperature range (−40°C to +125°C).

Technical Context

The MAX38902BATA+T implements a pMOS pass transistor architecture with internal 0.6V reference and precision feedback control loop, enabling stable regulation across 0.6V–5.3V via external resistor divider on FB pin. Its POK output uses open-drain logic with 91% V_OUT threshold and 100mV low-state voltage at 1mA sink current.

Thermal protection activates at +165°C junction temperature with hysteresis (−15°C), and short-circuit current limiting holds output at ~700mA typical. Input reverse-current protection engages when V_IN falls 10mV below V_OUT, disabling the pass device to block backfeed.

Key Specifications

Pinout & Package

MAX38902BATA+T is housed in an 8-pin, 2mm × 2mm, 0.5mm pitch TDFN package (package code T822+3C) with exposed pad (EP) for thermal dissipation. The EP must be soldered to a PCB ground plane with ≥4 thermal vias for optimal θ_JA = 102°C/W (4-layer board).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX8902BATA+ and TPL7407LADGKR, the MAX38902BATA+ uniquely combines ultra-low noise, resistor-adjustable output, POK signaling, and active discharge in a compact TDFN - making it optimal for space-constrained, high-fidelity analog power domains requiring coordinated power sequencing.

Availability

MAX38902BATA+T is available at Aetrix Electronics and suitable for high-resolution data acquisition systems, audio signal processing modules, and communication baseband circuits requiring stable component supply across extended temperature and long product lifecycles.

Supply support for MAX38902BATA+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, Inc. 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 MAX38902 series belongs to Analog Devices' precision power management portfolio, designed specifically for noise-sensitive analog signal chains where DC accuracy, transient response, and system-level power sequencing integrity are critical.

FAQ

What output voltage range does the MAX38902BATA+T support?

The MAX38902BATA+T supports an adjustable output voltage range of 0.6V to 5.3V, set by an external resistor divider connected to the FB pin. Its internal 0.6V feedback reference enables precise scaling, and the regulator maintains ±1% DC accuracy across load, line, and temperature - ensuring reliable operation for diverse analog and mixed-signal loads powered by the MAX38902BATA+T.

Does the MAX38902BATA+T include power-good (POK) functionality?

Yes, the MAX38902BATA+T integrates an active-low, open-drain POK output that asserts low when the regulated output reaches 91% of its target voltage (±3% tolerance). This feature enables deterministic system reset sequencing and is distinct to the MAX38902B variant - the MAX38902BATA+T delivers this capability in its 8-pin TDFN package without requiring external monitoring circuitry.

How does the MAX38902BATA+T handle reverse current flow from output to input?

The MAX38902BATA+T includes integrated reverse-current protection that disables the pass device when V_IN drops 10mV below V_OUT. This prevents backfeed from large output capacitors or backup supplies during input power loss - a critical safeguard in battery-backed or redundant power architectures using the MAX38902BATA+T as the primary analog rail regulator.

What is the minimum output capacitance required for stability with the MAX38902BATA+T?

The MAX38902BATA+T is stable with a minimum 2µF ceramic output capacitor (X5R or X7R dielectric), including derating for DC bias and temperature. This low requirement simplifies layout and reduces bill-of-materials cost compared to legacy LDOs needing ≥10µF - a key enabler for compact, high-density designs relying on the MAX38902BATA+T for analog power integrity.

Can the MAX38902BATA+T be used in automotive applications?

The MAX38902BATA+T is rated for −40°C to +125°C junction temperature and qualified to AEC-Q200 stress test guidelines per Analog Devices' reliability program. While not AEC-Q100 qualified as a complete device, its thermal and electrical specifications meet requirements for under-hood and infotainment subsystems - provided system-level validation confirms suitability for the specific automotive use case involving the MAX38902BATA+T.