Analog Devices Inc./Maxim Integrated MAX8511ETA25+T

Overview

The MAX8511ETA25+T from Maxim Integrated is a 2.5V fixed-output, ultra-low-noise, low-dropout linear regulator delivering up to 120mA output current with 120mV dropout at full load and 40μA ground current. It uses a P-channel MOSFET pass element, requires only input and output ceramic capacitors (no bypass capacitor), and operates from 2V to 6V input across –40°C to +85°C. It targets noise-sensitive RF and analog power rails in portable wireless devices.

For engineers reviewing the MAX8511ETA25+T datasheet, MAX8511ETA25+T pinout, MAX8511ETA25+T application, or MAX8511ETA25+T equivalent, key selection criteria include its 2.5V preset output, TDFN-8 (2mm × 2mm) package, 230μVRMS output noise (100Hz–100kHz), 72dB PSRR at 1kHz, and shutdown current <1μA - all critical for battery-powered, space-constrained designs requiring clean, stable voltage regulation.

Technical Context

The MAX8511ETA25+T implements a P-channel MOSFET series pass transistor with 1Ω typical R_DS(ON), enabling low dropout and eliminating base-drive current loss. Its error amplifier compares a 1.225V bandgap reference against internal feedback to regulate output without external resistors.

Unlike the MAX8510, it omits the BP (bypass) pin and associated noise-reduction capacitor, trading ultra-low 11μVRMS noise for minimal board area and simplified layout. It retains thermal shutdown (160°C), current limiting (130–300mA), and fast load transient response optimized for ceramic capacitors.

Key Specifications

Pinout & Package

MAX8511ETA25+T is housed in an 8-pin TDFN-EP (2mm × 2mm × 0.8mm) package with exposed pad (EP) internally connected to GND for thermal enhancement. Pin 1 is marked by a dot; EP must be soldered to a large PCB ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with the MAX8511ETA25+T, the XC6219B252MR-G offers higher output current but sacrifices PSRR and package size, while the ADP160ACBZ-2.5-R7 delivers lower shutdown current at the expense of increased dropout and larger thermal resistance - making the MAX8511ETA25+T optimal for balanced noise, efficiency, and miniaturization in 2.5V portable RF applications.

Availability

MAX8511ETA25+T is available at Aetrix Electronics and suitable for Bluetooth radios, wireless LAN modules, digital cameras, and portable medical sensors requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.

Supply support for MAX8511ETA25+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 markets.

The MAX8510/MAX8511/MAX8512 family was designed specifically for ultra-low-noise, low-quiescent-current regulation in space-constrained, battery-powered portable electronics - emphasizing minimal external components, ceramic capacitor compatibility, and robust protection.

FAQ

What is the maximum input voltage rating for the MAX8511ETA25+T?

The MAX8511ETA25+T has an absolute maximum input voltage of +7V (IN to GND), but its specified operating input range is 2V to 6V. Exceeding 6V may cause excessive power dissipation or violate thermal limits, especially at high ambient temperatures or full load. Always maintain VIN ≤ 6V in normal operation to ensure reliability and compliance with datasheet specifications.

Does the MAX8511ETA25+T require an external feedback resistor network?

No, the MAX8511ETA25+T does not require an external feedback resistor network. It is a fixed-output regulator with factory-trimmed 2.5V output, using internal resistive division. Unlike the adjustable MAX8512, it has no FB pin and omits external resistors - simplifying design and reducing bill-of-materials cost.

Can the MAX8511ETA25+T be used with X5R or Y5V ceramic capacitors on the output?

Yes, the MAX8511ETA25+T is stable with 1μF X5R or X7R ceramic capacitors across its full operating temperature range. However, Y5V dielectrics exhibit significant capacitance and ESR drift below –10°C; for guaranteed stability at low temperatures, use ≥2.2μF Y5V or stick to X5R/X7R at 1μF - as confirmed in the "Capacitor Selection" section of the datasheet.

What is the thermal performance difference between the SC70 and TDFN packages for the MAX8511ETA25+T?

The MAX8511ETA25+T in TDFN-8 (2mm × 2mm) achieves θ_JA = 83.9°C/W, significantly better than the SC70's 324°C/W. This allows ~3.5× higher power dissipation before reaching thermal shutdown - critical for sustained 120mA loads in compact layouts. The exposed pad (EP) must be soldered to a thermal pad for optimal performance.

How does the MAX8511ETA25+T compare to the MAX8510ETA25+T in terms of noise performance?

The MAX8511ETA25+T delivers 230μV_RMS output noise (100Hz–100kHz), whereas the MAX8510ETA25+T achieves 11μV_RMS due to its dedicated BP pin and 10nF bypass capacitor. The MAX8511ETA25+T trades ultra-low noise for smaller solution size and fewer components - making it suitable where moderate noise is acceptable but board area is constrained.