Analog Devices Inc./Maxim Integrated MAX1976ETT100+T

Overview

The MAX1976ETT100+T from Maxim Integrated is a low-dropout linear regulator delivering 300mA continuous output current with 100mV dropout at full load, ±0.5% output voltage accuracy, and a fixed 1.00V output. It operates from 1.62V to 3.6V input and features an active-low open-drain RESET output with 70ms delay, making it suitable for power sequencing in portable battery-powered systems such as notebook computers and handheld devices.

For engineers reviewing the MAX1976ETT100+T datasheet, MAX1976ETT100+T pinout, MAX1976ETT100+T application, or MAX1976ETT100+T equivalent, key selection criteria include guaranteed 300mA load capability under low-input-voltage conditions (≥1.62V), thermal-overload and short-circuit protection, logic-controlled shutdown, and compatibility with 4.7µF low-ESR ceramic output capacitors.

Technical Context

The MAX1976ETT100+T uses an internal P-channel MOSFET pass transistor (R_DS(ON) = 0.33Ω) enabling supply current independence from load and dropout voltage - critical for battery life in portable applications. Its error amplifier compares a trimmed reference against feedback from a fixed internal divider to regulate the 1.00V output.

RESET functionality is implemented via a dedicated comparator monitoring V_OUT; it asserts low when V_OUT falls below 82.5% of nominal and remains asserted for ≥70ms after regulation is achieved. Thermal shutdown activates at +165°C with 15°C hysteresis, ensuring safe operation during overload.

Key Specifications

Pinout & Package

The MAX1976ETT100+T is housed in a 6-pin 3mm × 3mm thin DFN package (pkg code T633-2), with exposed paddle (EP) connected to GND for thermal dissipation. Pin 1 is IN; Pin 2 is GND; Pin 3 is SHDN; Pin 4 is RESET; Pin 5 is I.C. (internally connected, leave floating 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 the MAX1976ETT100+T, the XC6219B102MR-G offers lower BOM cost but requires external reset circuitry, while the ADP160AUJZ-1.0-R7 trades 300mA capability and 70ms RESET for significantly lower quiescent current - making it suitable only for sub-150mA loads where extended shelf life is critical.

Availability

The MAX1976ETT100+T is available at Aetrix Electronics and suitable for notebook computers, cellular telephones, and handheld computing devices requiring stable component supply across industrial temperature ranges (-40°C to +85°C) and long-term production continuity.

Supply support for MAX1976ETT100+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 precision analog and mixed-signal ICs for power management, sensing, and connectivity in demanding industrial and portable applications.

The MAX1963/MAX1976 product line was engineered specifically for low-input-voltage, high-accuracy LDO regulation in battery-powered portable electronics - emphasizing minimal dropout, tight output tolerance, and integrated power-good signaling.

FAQ

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

The MAX1976ETT100+T guarantees ±0.5% output voltage accuracy over the full -40°C to +85°C operating temperature range and for load currents from 1mA to 300mA. This specification is confirmed in the Electrical Characteristics table under "Output Voltage Accuracy" and applies regardless of input voltage within the 1.62V–3.6V range. The MAX1976ETT100+T achieves this via factory-trimmed internal feedback, eliminating need for external resistors.

Does the MAX1976ETT100+T require external capacitors, and what values are recommended?

Yes, the MAX1976ETT100+T requires two external ceramic capacitors: a 1µF capacitor between IN and GND, and a 4.7µF low-ESR (≤30mΩ) capacitor between OUT and GND. These values ensure stability across temperature and load, minimize output noise, and optimize transient response. Placement must be adjacent to the MAX1976ETT100+T pins to reduce trace inductance - deviation risks oscillation or degraded PSRR performance.

How does the RESET output of the MAX1976ETT100+T behave during power-up and brownout?

The RESET output of the MAX1976ETT100+T is an active-low open-drain signal that remains asserted (low) until the output voltage reaches regulation and stays within ±2.5% of 1.00V for at least 70ms. If V_OUT drops below 82.5% of nominal (i.e., <825mV), RESET immediately pulls low again. During shutdown (SHDN = low), RESET is actively driven low - ensuring deterministic reset behavior across all fault conditions.

Can the MAX1976ETT100+T be used in place of the MAX1963ETT100+T?

No - the MAX1976ETT100+T and MAX1963ETT100+T share pinout and electrical specs except for RESET timing: MAX1976 provides 70ms delay, while MAX1963 provides only 2.2ms. Substituting one for the other may cause premature release of reset in systems relying on precise power-good timing. Both parts are drop-in compatible physically, but functional equivalence depends entirely on whether the host system's firmware or hardware expects 2.2ms or 70ms assertion duration.

What thermal considerations apply to the MAX1976ETT100+T in the 3mm × 3mm DFN package?

The MAX1976ETT100+T in the TDFN package has a thermal resistance θ_JA of ~50°C/W when mounted on a 1-inch² 2-oz copper pad. To avoid thermal shutdown at 300mA load with 2V input-output differential (2W dissipation), the PCB must provide adequate heatsinking via the exposed paddle (EP), connected directly to a solid GND plane. Without proper copper area, junction temperature can exceed +165°C, triggering thermal cycling - verified in the Absolute Maximum Ratings and Thermal Protection sections of the MAX1976ETT100+T datasheet.