Analog Devices Inc./Maxim Integrated MAX1976AEZT150+T

Overview

MAX1976AEZT150+T from Maxim Integrated is a low-dropout linear regulator with preset 1.5V output, delivering guaranteed 300mA continuous current from 1.62V–3.6V input, featuring 100mV dropout at full load and active-low open-drain RESET with 70ms delay. It targets power management in space-constrained portable electronics requiring stable low-voltage rails.

For engineers reviewing the MAX1976AEZT150+T datasheet, MAX1976AEZT150+T pinout, MAX1976AEZT150+T application, or MAX1976AEZT150+T equivalent, key selection criteria include input voltage range (1.62V–3.6V), ±0.5% output accuracy over temperature, thermal shutdown at +165°C, and SOT23-6 package compatibility with PCB area <1.1mm height constraints.

Technical Context

The MAX1976AEZT150+T uses an internal p-channel MOSFET pass transistor (R_DS(ON) = 0.33Ω) enabling supply current independence from load and dropout voltage. Its error amplifier compares a precision reference against internal feedback to regulate output, while a dedicated reset comparator monitors V_OUT against 82.5% of nominal voltage with 1.7% hysteresis.

Shutdown control is logic-level active-low on SHDN, reducing quiescent current below 1µA; RESET asserts during power-up, brownout, or shutdown and remains asserted for ≥70ms after regulation is achieved. Thermal protection activates at +165°C with 15°C hysteresis, pulsing output under sustained overload.

Key Specifications

Pinout & Package

MAX1976AEZT150+T is housed in a lead-free, RoHS-compliant 6-pin thin SOT23-6 package (1.6mm × 2.9mm × 1.1mm), optimized for high-density portable PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A0515PDBVR and MCP1826T-1502E/DB, MAX1976AEZT150+T uniquely combines 300mA capability, 100mV dropout, integrated 70ms RESET, and active-low shutdown in a 6-pin SOT23 - enabling single-chip power-good sequencing without external components.

Availability

MAX1976AEZT150+T is available at Aetrix Electronics and suitable for notebook computers, cellular phones, digital audio players, and PCMCIA cards requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX1976AEZT150+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, mixed-signal, and power management ICs for demanding industrial, automotive, and portable applications.

The MAX1976A product line delivers low-input-voltage, high-accuracy LDOs with integrated RESET for battery-powered handheld and computing equipment where minimal board area and tight voltage tolerances are critical.

FAQ

What is the guaranteed output voltage accuracy of the MAX1976AEZT150+T over temperature?

The MAX1976AEZT150+T guarantees ±2.5% output voltage accuracy across the full operating temperature range of -40°C to +85°C, with tighter ±0.5% accuracy specified at +25°C. This ensures reliable operation of 1.5V logic interfaces even under extreme ambient conditions, and the MAX1976AEZT150+T achieves this via laser-trimmed internal feedback resistors and a precision bandgap reference.

Does the MAX1976AEZT150+T require external capacitors, and what values are recommended?

Yes, the MAX1976AEZT150+T requires a 1µF ceramic capacitor between IN and GND, and a 4.7µF low-ESR ceramic capacitor between OUT and GND for stable operation. These values ensure adequate phase margin across -40°C to +85°C and support 300mA load transients; using capacitors with ESR ≤30mΩ is mandatory for stability, and the MAX1976AEZT150+T datasheet specifies placement within 2mm of the pins to minimize trace inductance.

How does the RESET function of the MAX1976AEZT150+T behave during power-up and brownout?

The MAX1976AEZT150+T asserts its open-drain RESET output low during power-up until the output reaches regulation, then holds it low for ≥70ms before releasing. During brownout, RESET reasserts immediately if V_OUT falls below 82.5% of 1.5V (1.2375V), with 1.7% hysteresis. This behavior is fully integrated - no external components are needed, and the MAX1976AEZT150+T provides deterministic reset timing for microprocessors and FPGAs.

What thermal protection features are built into the MAX1976AEZT150+T?

The MAX1976AEZT150+T incorporates thermal-overload protection that disables the pass transistor when junction temperature exceeds +165°C, then re-enables it after cooling by 15°C - creating a pulsed output under sustained overload. This prevents permanent damage without requiring external thermal sensors, and the MAX1976AEZT150+T sustains safe operation up to its absolute maximum junction temperature of +150°C under proper PCB heatsinking.

Can the MAX1976AEZT150+T be used with input voltages below 1.62V?

No - the MAX1976AEZT150+T has a strict minimum input voltage of 1.62V, enforced by internal undervoltage lockout (UVLO) that disables regulation if VIN drops below ~1.60V (with 180mV hysteresis). Operating below this threshold risks unregulated output and potential system instability; the MAX1976AEZT150+T is not characterized or guaranteed for sub-1.62V operation, and doing so voids parametric performance guarantees.