Analog Devices Inc./Maxim Integrated MAX1976AETA150+T

Overview

MAX1976AETA150+T from Maxim Integrated is a low-dropout linear regulator with preset 1.50V output, delivering guaranteed 300mA continuous current at ≤100mV dropout (at 300mA), ±0.5% initial accuracy, and active-low open-drain RESET with 70ms delay. It operates from 1.62V to 3.6V input and targets power management in space-constrained portable systems such as handheld computers and smart phones.

For engineers reviewing the MAX1976AETA150+T datasheet, MAX1976AETA150+T pinout, MAX1976AETA150+T application, or MAX1976AETA150+T equivalent, key selection criteria include its 1.50V fixed output, 70ms RESET assertion time, SOT23-6 package footprint, thermal shutdown at +165°C, and compatibility with 1µF input / 4.7µF output ceramic capacitors for stable regulation.

Technical Context

The MAX1976AETA150+T integrates a p-channel MOSFET pass transistor (R_DS(ON) = 0.33Ω) enabling load-independent quiescent current (90µA typ) and low dropout across full load range. Its internal error amplifier compares feedback against a precision reference to regulate output voltage with ±0.5% initial accuracy over line, load, and temperature.

RESET functionality uses a dedicated comparator monitoring V_OUT; it asserts low when V_OUT falls below 82.5% of nominal (±2.5% threshold accuracy) and remains asserted ≥70ms after V_OUT recovers. Shutdown is logic-controlled via active-low SHDN pin, reducing supply current to <1µA while actively pulling OUT to GND.

Key Specifications

Pinout & Package

MAX1976AETA150+T is packaged in a 6-pin thin SOT23-6 (1.6mm × 2.9mm × 1.1mm), RoHS-compliant, lead-free package with exposed pad not present (SOT23 variant). Pin 1 is IN; Pin 2 is GND; Pin 3 is SHDN; Pin 4 is RESET; Pin 5 is I.C. (internally connected, leave unconnected or tie to GND); Pin 6 is OUT.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A0515PDBVR and MCP1826-1502E/DB, MAX1976AETA150+T uniquely combines 300mA delivery, 100mV dropout, ±0.5% accuracy, and 70ms RESET in a standard SOT23-6 footprint-enabling single-component power-good sequencing in battery-powered systems where input headroom and reliability are constrained.

Availability

MAX1976AETA150+T is available at Aetrix Electronics and suitable for smartphone baseband power, handheld computer core logic, digital still camera sensor bias, and PCMCIA card interface applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX1976AETA150+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) designs high-performance analog, mixed-signal, and power-management ICs for demanding applications in industrial, communications, and consumer markets.

The MAX1963A/MAX1976A product line delivers low-input-voltage, high-accuracy LDOs with integrated RESET specifically for portable battery-powered equipment where small size, low dropout, and reliable power sequencing are essential.

FAQ

What is the exact output voltage of MAX1976AETA150+T and how is it set?

The MAX1976AETA150+T provides a factory-trimmed fixed output voltage of 1.50V. This value is encoded in the part number suffix "150" and achieved via internal laser trimming during wafer test-no external resistors or configuration pins are required. The device maintains ±0.5% accuracy at +25°C and ±2.5% over full load, line, and temperature range (-40°C to +85°C), ensuring predictable performance without user calibration.

Does MAX1976AETA150+T include thermal protection, and what is its trip point?

Yes, MAX1976AETA150+T incorporates thermal-overload protection that disables the pass transistor when junction temperature exceeds +165°C. After shutdown, the device remains off until the junction cools by 15°C (hysteresis), then resumes regulation. This behavior prevents permanent damage during sustained overload or poor heatsinking and is fully specified in the Absolute Maximum Ratings and Electrical Characteristics tables of the official datasheet.

What is the RESET output behavior of MAX1976AETA150+T during power-up and brownout?

The RESET output of MAX1976AETA150+T is an active-low, open-drain signal that remains asserted (low) for at least 70ms after V_OUT reaches regulation. It deasserts when V_OUT rises above 82.5% of 1.50V and reasserts immediately if V_OUT drops below that threshold-ensuring robust power-good signaling during startup, shutdown, and brownout events down to 1.0V input.

Can MAX1976AETA150+T operate from a 1.65V input while delivering 1.50V at 300mA?

Yes, MAX1976AETA150+T can sustain 300mA output at 1.50V with a 1.65V input because its typical dropout voltage is 100mV at that load. Since 1.65V − 1.50V = 150mV > 100mV, the device remains in regulation. However, margin decreases near minimum input; operation is guaranteed down to VIN = 1.60V (1.50V + 100mV) per datasheet specifications under worst-case conditions.

What capacitor values are required for stable operation of MAX1976AETA150+T?

MAX1976AETA150+T requires a minimum 1µF ceramic capacitor between IN and GND, and a 4.7µF low-ESR (≤30mΩ) ceramic capacitor between OUT and GND. These values ensure stability across -40°C to +85°C, support full 300mA load step response, and maintain ≥70dB PSRR below 1kHz. Larger or lower-ESR output capacitors further improve transient suppression but are not mandatory for basic functionality.