Analog Devices Inc./Maxim Integrated MAX1976EZT300

Overview

MAX1976EZT300 from Maxim Integrated is a low-dropout linear regulator (LDO) with integrated active-low reset output, designed for battery-powered portable electronics. It delivers 300mA continuous output current with 100mV dropout at full load, operates from 1.62V to 3.6V input, and provides a factory-trimmed 3.0V output voltage with ±0.5% accuracy over temperature and load. It is used in notebook computers and handheld devices requiring stable low-voltage power with power-good supervision.

For engineers reviewing the MAX1976EZT300 datasheet, MAX1976EZT300 pinout, MAX1976EZT300 application, or MAX1976EZT300 equivalent, key selection criteria include guaranteed 300mA output under 1.62V minimum input, 70ms reset delay after regulation, thermal-overload protection, logic-controlled shutdown, and compatibility with 4.7µF ceramic output capacitance.

Technical Context

The MAX1976EZT300 employs an internal P-channel MOSFET pass transistor (R_DS(ON) = 0.33Ω) enabling supply current independence from load and dropout voltage - critical for ultra-low-quiescent-current operation in battery systems. Its error amplifier compares a precision reference against a resistive feedback network to regulate output voltage.

It integrates a dedicated power-good comparator that monitors V_OUT and asserts the open-drain RESET output when V_OUT falls below 82.5% of nominal (±1.7% hysteresis); RESET remains asserted for ≥70ms after V_OUT reaches regulation, satisfying microprocessor reset timing requirements in portable platforms.

Key Specifications

Pinout & Package

MAX1976EZT300 is packaged in a 6-pin thin SOT23-6 (Z6-1 package code), height <1.1mm, footprint 2.9mm × 1.6mm. The exposed pad is not present in this variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6206P302MR and ADP125ARZ-3.0-R7, MAX1976EZT300 uniquely combines 1.62V minimum input, 3.0V fixed output with ±0.5% accuracy, 70ms reset delay, and SOT23-6 footprint - making it optimal for space- and battery-life-constrained portable designs requiring self-contained power supervision.

Availability

MAX1976EZT300 is available at Aetrix Electronics and suitable for notebook computers, cellular telephones, and personal digital assistants requiring stable component supply with guaranteed long-term availability and RoHS-compliant packaging.

Supply support for MAX1976EZT300 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 analog and mixed-signal ICs for power management, sensing, and connectivity applications.

The MAX1963/MAX1976 product line was engineered for ultra-low-input-voltage, high-accuracy LDO regulation in portable battery-powered systems - emphasizing minimal dropout, integrated reset, and minimal quiescent current without sacrificing output stability or transient performance.

FAQ

What is the guaranteed reset delay time for MAX1976EZT300?

The MAX1976EZT300 guarantees a minimum reset delay of 70ms after the output voltage reaches regulation. This delay is measured from the moment V_OUT crosses the regulation threshold until the open-drain RESET pin transitions high (with external pull-up). The typical value is 100ms, and maximum is 160ms - all values are specified over the full -40°C to +85°C operating temperature range. This timing satisfies standard microprocessor reset requirements.

Does MAX1976EZT300 require external feedback resistors to set its output voltage?

No, MAX1976EZT300 does not require external feedback resistors. It features a factory-trimmed 3.0V output voltage, internally set via laser trimming of on-die resistors. This eliminates external components, reduces PCB area, and ensures ±0.5% output accuracy across load, line, and temperature - critical for precision rail generation in portable systems.

Can MAX1976EZT300 operate from a single-cell Li-ion battery throughout its discharge curve?

Yes, MAX1976EZT300 can operate across the full useful discharge range of a single-cell Li-ion battery (≈4.2V down to ≈3.0V). With its 1.62V minimum input voltage specification and only 100mV dropout at 300mA, it maintains regulation on a 3.0V output until the battery drops to ~3.1V - capturing >95% of the cell's energy capacity and maximizing runtime in battery-powered devices.

What is the thermal shutdown behavior of MAX1976EZT300?

MAX1976EZT300 activates thermal shutdown when the junction temperature exceeds +165°C. The pass transistor is turned off, allowing the die to cool. Once the junction temperature falls by 15°C (to ~+150°C), the device automatically resumes regulation. This hysteresis prevents oscillation and provides pulsed output during sustained overload - protecting both the IC and downstream circuitry without requiring manual intervention.

Is MAX1976EZT300 pin-compatible with MAX1963EZT300?

Yes, MAX1976EZT300 and MAX1963EZT300 share identical pinout, package (SOT23-6), and electrical interface - including IN, GND, SHDN, RESET, I.C., and OUT assignments. The sole functional difference is the reset delay: 70ms (MAX1976) vs. 2.2ms (MAX1963). Therefore, MAX1976EZT300 can be substituted in designs requiring longer reset assertion, but not vice versa without verifying µP timing margins.