Analog Devices Inc./Maxim Integrated MAX1976ETT250+T

Overview

MAX1976ETT250+T from Maxim Integrated is a low-dropout linear regulator delivering 300mA continuous output current with ±0.5% output voltage accuracy at 2.50V, 100mV dropout at full load, and a 70ms active-low open-drain RESET flag. It operates from 1.62V to 3.6V input and is used in battery-powered portable electronics requiring stable low-voltage rail generation and power-on reset supervision.

For engineers reviewing the MAX1976ETT250+T datasheet, MAX1976ETT250+T pinout, MAX1976ETT250+T application, or MAX1976ETT250+T equivalent, key selection criteria include guaranteed 300mA load capability under 1.62V minimum input, 70ms reset delay timing, thermal-overload protection, and compatibility with 4.7µF low-ESR ceramic output capacitors in space-constrained designs.

Technical Context

The MAX1976ETT250+T integrates a 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 systems. Its internal feedback divider sets a fixed 2.50V output without external resistors.

It features an active-low open-drain RESET output asserting for ≥70ms after V_OUT reaches regulation and deasserting immediately upon V_OUT falling below 82.5% of nominal. Shutdown logic reduces quiescent current to <1µA, while thermal shutdown activates at +165°C with 15°C hysteresis.

Key Specifications

Pinout & Package

MAX1976ETT250+T uses a 6-pin 3mm × 3mm thin DFN package (pkg code T633+2) with exposed thermal pad (EP) soldered to ground plane for enhanced thermal performance. Package height is <0.8mm, suitable for ultra-thin portable devices.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6219B252MR-G and ADP125ARHZ-2.5-R7, the MAX1976ETT250+T uniquely balances 300mA capability, 100mV dropout, 70ms reset timing, and 0.8mm-profile DFN packaging - making it optimal for space- and battery-life-constrained 2.5V rail generation where neither lower-current nor oversized alternatives suffice.

Availability

MAX1976ETT250+T is available at Aetrix Electronics and suitable for notebook computers, cellular telephones, digital cameras, and PCMCIA cards requiring stable component supply with RoHS-compliant, lead-free packaging and guaranteed 2.50V output accuracy.

Supply support for MAX1976ETT250+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 semiconductor company specializing in high-performance analog, mixed-signal, and power management solutions for industrial, communications, computing, and consumer markets.

The MAX1963/MAX1976 product line was designed specifically for ultra-low-input-voltage, high-accuracy LDO regulation in portable battery-powered equipment - emphasizing minimal dropout, fixed-output precision, integrated reset supervision, and compact packaging.

FAQ

What is the output voltage tolerance of the MAX1976ETT250+T over temperature and load?

The MAX1976ETT250+T guarantees ±0.5% output voltage accuracy over the full -40°C to +85°C operating temperature range, 1mA to 300mA load current, and 1.62V to 3.6V input voltage. This specification is confirmed in the Electrical Characteristics table and applies directly to the MAX1976ETT250+T with its factory-trimmed 2.50V output.

Does the MAX1976ETT250+T require external resistors to set the output voltage?

No, the MAX1976ETT250+T has a factory-trimmed fixed 2.50V output and does not require external feedback resistors. The internal voltage divider and reference are laser-trimmed during production, ensuring ±0.5% accuracy without user configuration - a key feature confirmed in the General Description and Selector Guide sections of the datasheet.

How does the RESET function behave during power-up and brownout events for the MAX1976ETT250+T?

The MAX1976ETT250+T asserts its open-drain RESET output low during power-up until the 2.50V output reaches regulation, then holds low for ≥70ms before releasing. During brownout, RESET reasserts immediately if V_OUT falls below 82.5% of nominal (2.06V), providing robust microprocessor supervision - behavior explicitly defined in the RESET Output section and Pin Description.

What is the recommended output capacitor for stable operation of the MAX1976ETT250+T?

The MAX1976ETT250+T requires a 4.7µF low-ESR ceramic capacitor between OUT and GND for guaranteed stability across temperature and load. The datasheet specifies ESR ≤30mΩ and recommends placing the capacitor as close as possible to the device pins to minimize trace inductance - a requirement validated in the Applications Information section.

Can the MAX1976ETT250+T operate from a single 1.8V Li-ion cell?

Yes, the MAX1976ETT250+T operates from 1.62V to 3.6V input, making it compatible with single-cell Li-ion (2.7V–4.2V) and LiFePO₄ (2.0V–3.6V) batteries. At 2.50V output, its 100mV dropout allows regulation down to 2.60V input - supporting operation through most of the LiFePO₄ discharge curve and partial Li-ion discharge.