Analog Devices Inc./Maxim Integrated MAX8840ELT26+T

Overview

MAX8840ELT26+T from Maxim Integrated is a 2.6V fixed-output, ultra-low-noise, high-PSRR, low-dropout linear regulator delivering up to 150mA output current with 120mV dropout at 120mA load, 11µV_RMS output noise (100Hz–100kHz), and 78dB PSRR at 1kHz. It employs a p-channel MOSFET pass transistor, operates from 2V–6V input, and targets noise-sensitive analog/RF power rails in portable electronics.

For engineers reviewing the MAX8840ELT26+T datasheet, MAX8840ELT26+T pinout, MAX8840ELT26+T application, or MAX8840ELT26+T equivalent, key selection criteria include guaranteed 2.6V ±3% output accuracy across load/temperature, 40µA ground current at light load, shutdown current <1µA, stability with 1µF ceramic output capacitor, and µDFN-6 (1.5mm × 1.0mm) package compatibility with space-constrained PCB layouts.

Technical Context

The MAX8840ELT26+T implements a bandgap-referenced error amplifier driving a 1Ω (typ) p-channel MOSFET pass transistor, enabling low quiescent current and minimal dropout voltage dependency on load. Its dedicated BP pin accepts a 10nF bypass capacitor to shunt high-frequency noise from the internal reference, directly enabling the 11µV_RMS noise performance.

Shutdown control is active-low on SHDN, disabling the reference, error amplifier, and gate drive to achieve sub-1µA supply current. Thermal protection activates at +160°C junction temperature with 10°C hysteresis, and overcurrent limiting holds output current between 150mA (min) and 300mA (max) under fault conditions.

Key Specifications

Pinout & Package

MAX8840ELT26+T is housed in a 6-pin µDFN package measuring 1.5mm × 1.0mm × 0.8mm, with exposed thermal pad (GND-connected) for enhanced heat dissipation in compact layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with the Torex XC6219B262MR-G and ADP125ARHZ-2.6-R7, the MAX8840ELT26+T uniquely delivers the lowest 11µV_RMS noise in the smallest 1.5mm × 1.0mm µDFN package-making it the optimal choice for next-generation wearables and hearing aids where both acoustic purity and miniaturization are non-negotiable.

Availability

MAX8840ELT26+T is available at Aetrix Electronics and suitable for cellular phone RF front-ends, digital camera image sensor bias, and portable audio codec power requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for MAX8840ELT26+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

Maxim Integrated (now part of Analog Devices) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.

The MAX8840 series belongs to Maxim's ultra-low-noise LDO product line, engineered specifically for powering noise-critical analog and RF circuitry in battery-operated portable devices where PSRR, dropout, and quiescent current are design-defining parameters.

FAQ

What is the output voltage tolerance of the MAX8840ELT26+T over temperature and load?

The MAX8840ELT26+T guarantees ±3% output voltage accuracy across the full -40°C to +85°C operating temperature range and for load currents from 100µA to 80mA. At room temperature and 1mA load, the tolerance tightens to ±1%. This specification ensures reliable biasing of 2.6V-tolerant analog components without external trimming or calibration in production systems.

Does the MAX8840ELT26+T require an external bypass capacitor, and what value is recommended?

Yes, the MAX8840ELT26+T requires a 10nF capacitor connected between the BP pin and the OUT pin to achieve its specified 11µV_RMS output noise. Values below 1nF or above 100nF are not recommended, as they degrade noise performance or destabilize the internal noise-bypass circuit. The capacitor must be placed as close as possible to the BP and OUT pins with minimal trace length.

Can the MAX8840ELT26+T be used with ceramic output capacitors smaller than 1µF?

No-the MAX8840ELT26+T is only guaranteed stable with a minimum 1µF ceramic output capacitor (X7R or X5R dielectric). Using smaller values risks oscillation or degraded transient response. The 1µF requirement applies across all operating conditions, including full 150mA load and -40°C to +85°C temperature range, per the manufacturer's stability characterization.

What is the maximum input voltage the MAX8840ELT26+T can withstand?

The absolute maximum input voltage for the MAX8840ELT26+T is +7V applied between the IN and GND pins. However, the recommended operating input voltage range is 2V to 6V. Exceeding 6V may cause excessive power dissipation or violate safe operating area limits, especially at elevated temperatures or high output loads.

How does the shutdown function behave on the MAX8840ELT26+T, and what is the exit delay?

Driving the SHDN pin low disables the reference, error amplifier, and pass transistor, placing the OUT pin in high-impedance state with supply current dropping below 1µA. Upon release (SHDN pulled high), the MAX8840ELT26+T exits shutdown with a typical delay of 300µs to reach 90% of final 2.6V output, as verified under 50Ω load conditions per the datasheet's Typical Operating Characteristics.