Analog Devices Inc./Maxim Integrated MAX1976ETT100+

Overview

MAX1976ETT100+ from Maxim Integrated is a low-dropout linear regulator (LDO) with integrated active-low reset output, designed for battery-powered portable systems. It delivers 300mA continuous output current with 100mV dropout at full load, supports input voltage from +1.62V to +3.6V, and provides a factory-trimmed +1.00V output. Its primary circuit role is post-regulation power supply stabilization in space-constrained applications such as notebook computers and cellular handsets.

For engineers reviewing the MAX1976ETT100+ datasheet, MAX1976ETT100+ pinout, MAX1976ETT100+ application, or MAX1976ETT100+ equivalent, key selection criteria include guaranteed 300mA output under low-input conditions, ±0.5% output accuracy over temperature and load, 70ms reset delay timing, thermal-overload protection, and compatibility with 4.7µF ceramic output capacitance for stable transient response.

Technical Context

The MAX1976ETT100+ employs an internal P-channel MOSFET pass transistor (R_DS(ON) = 0.33Ω) enabling supply current independence from load and dropout voltage-critical for battery runtime optimization. Its error amplifier compares a precision reference against a resistive feedback network to regulate output voltage.

Reset functionality is implemented via a dedicated comparator monitoring V_OUT, asserting active-low RESET after 70ms (typ) once regulation is achieved and deasserting immediately upon V_OUT falling below 82.5% of nominal. Shutdown is logic-controlled via active-low SHDN, reducing quiescent current to <1µA.

Key Specifications

Pinout & Package

MAX1976ETT100+ uses a 6-pin 3mm × 3mm thin DFN package (pkg code T633-2), with exposed paddle (EP) connected to GND for thermal dissipation. Package height is <0.8mm, suitable for ultra-thin portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX1976EZT100+, the MAX1976ETT100+ offers 2.7× higher thermal power handling and smaller footprint; versus XC6210B102MR-G, it provides guaranteed reset timing and full 300mA capability-critical for processor core rails requiring both regulation integrity and deterministic boot sequencing.

Availability

MAX1976ETT100+ is available at Aetrix Electronics and suitable for notebook computers, cellular telephones, and digital cameras requiring stable component supply with RoHS-compliant, lead-free packaging and guaranteed long-term continuity.

Supply support for MAX1976ETT100+ 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 semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, computing, and portable applications.

The MAX1963/MAX1976 product line was engineered for ultra-low-voltage battery-powered systems needing high accuracy, minimal dropout, and integrated power-good signaling-targeting PDAs, smartphones, and thin-client platforms before modern PMIC consolidation.

FAQ

What is the output voltage tolerance of the MAX1976ETT100+ over temperature and load?

The MAX1976ETT100+ guarantees ±0.5% output voltage accuracy across -40°C to +85°C, for load currents from 1mA to 300mA and input voltages from (V_OUT + 0.5V) to +3.6V. This specification is production-tested at +25°C and ensured by design over the full operating range-critical for powering voltage-sensitive SoC cores where deviation beyond ±1% risks functional failure.

Does the MAX1976ETT100+ require external components for stable operation?

Yes-the MAX1976ETT100+ requires a 1µF ceramic capacitor between IN and GND, and a 4.7µF low-ESR (≤30mΩ) ceramic capacitor between OUT and GND. These are mandatory for stability, transient response, and PSRR performance. The device is not stable with electrolytic or high-ESR capacitors, and omitting either capacitor risks oscillation or excessive output ripple.

How does the RESET function behave during shutdown or input undervoltage?

During shutdown (SHDN = GND), the MAX1976ETT100+ actively pulls RESET low. During input undervoltage (VIN < 1.60V), RESET remains asserted until V_OUT reaches regulation and sustains 70ms (typ) thereafter. If V_OUT drops below 82.5% of nominal due to overload or input collapse, RESET falls immediately-ensuring µP reset is synchronized to actual output health, not just input presence.

What thermal protection mechanism does the MAX1976ETT100+ implement?

The MAX1976ETT100+ incorporates thermal-overload protection that disables the pass transistor when junction temperature exceeds +165°C. After shutdown, the device remains off until temperature falls by 15°C (to ~+150°C), then resumes regulation. This hysteresis prevents thermal cycling and allows safe pulsed operation during sustained overload-distinct from latch-off behavior seen in less robust regulators.

Can the MAX1976ETT100+ operate with input voltage below 1.62V?

No-the MAX1976ETT100+ has a specified minimum input voltage of +1.62V. Below this, undervoltage lockout (UVLO) activates at ~1.45V (typ), disabling regulation and asserting RESET. Operation below 1.62V is outside absolute maximum ratings and may cause unpredictable output behavior or damage; it is not characterized or guaranteed.