Analog Devices Inc./Maxim Integrated MAX1976AEZT180+

Overview

MAX1976AEZT180+ from Maxim Integrated is a low-dropout linear regulator with fixed 1.80V output, delivering up to 300mA continuous load current from a 1.62V–3.6V input supply. It features ±0.5% output voltage accuracy over load/line/temperature, 100mV dropout at full load, and a 70ms active-low open-drain RESET output asserted during power-up/brownout-designed for core voltage regulation in portable battery-powered systems such as smartphones and handheld computers.

For engineers reviewing the MAX1976AEZT180+ datasheet, MAX1976AEZT180+ pinout, MAX1976AEZT180+ application, or MAX1976AEZT180+ equivalent, key selection criteria include guaranteed 300mA output under low-input-voltage conditions (≥1.62V), precise 1.80V preset output with ±0.5% accuracy, thermal/short-circuit protection, logic-controlled shutdown, and compatibility with compact 6-pin thin SOT23-6 packaging.

Technical Context

The MAX1976AEZT180+ employs an internal p-channel MOSFET pass transistor (R_DS(ON) = 0.33Ω) enabling low dropout and supply current independent of load or dropout voltage. Its error amplifier compares a stable internal reference against feedback from the fixed 1.80V output divider, driving the pass gate to maintain regulation across –40°C to +85°C.

RESET functionality is implemented via a dedicated comparator monitoring V_OUT, asserting low when output falls below 82.5% of nominal (±2.5% threshold accuracy) and holding for ≥70ms after regulation is achieved. Shutdown is controlled by an active-low SHDN pin with <1µA off-state current and 90µs turn-on delay.

Key Specifications

Pinout & Package

MAX1976AEZT180+ is housed in a 6-pin thin SOT23-6 package (1.6mm × 2.9mm × 1.1mm max height), optimized for space-constrained portable designs. 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 XC6219B182MR-G and ADP160ACBZ-1.8-R7, the MAX1976AEZT180+ uniquely integrates 300mA capability, 70ms RESET, thermal protection, and 100mV dropout in a 6-pin SOT23-enabling single-component power-good sequencing and higher load headroom without compromising size or efficiency.

Availability

MAX1976AEZT180+ is available at Aetrix Electronics and suitable for smartphone power management, wearable sensor hubs, industrial handheld terminals, and medical point-of-care devices requiring stable component supply and long-term production continuity.

Supply support for MAX1976AEZT180+ 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 MAX1963A/MAX1976A product line delivers low-input-voltage, high-accuracy LDOs with integrated RESET for battery-powered systems where small size, low dropout, and deterministic power sequencing are critical.

FAQ

What is the exact output voltage tolerance of the MAX1976AEZT180+ over temperature and load?

The MAX1976AEZT180+ guarantees ±0.5% output voltage accuracy at TA = +25°C. Over the full –40°C to +85°C operating range and 1mA–300mA load, total accuracy is ±2.5%, including line, load, and temperature effects. This is confirmed in the Electrical Characteristics table under "Output Voltage Accuracy" with VIN = (VOUT + 0.5V) to +3.6V and IOUT = 1mA to 300mA.

Does the MAX1976AEZT180+ require external capacitors, and what values are mandatory?

Yes, the MAX1976AEZT180+ requires two mandatory ceramic capacitors: a minimum 1µF capacitor between IN and GND, and a minimum 4.7µF low-ESR (≤30mΩ) capacitor between OUT and GND. These are specified in the Applications Information section for stability, transient response, and noise reduction across the full temperature and load range.

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

The RESET output of the MAX1976AEZT180+ asserts low whenever VOUT falls below 82.5% of nominal (1.485V), including during input undervoltage (VIN < 1.62V), brownout, or active shutdown (SHDN = low). RESET remains asserted for ≥70ms after VOUT recovers to regulation, and falls immediately upon any subsequent drop below threshold.

Can the MAX1976AEZT180+ be used with input voltages below 1.62V?

No-the MAX1976AEZT180+ has a minimum input voltage of 1.62V, enforced by internal undervoltage lockout (UVLO) that disables regulation below ~1.60V (typical). Operation below this threshold is undefined and may result in unregulated output or erratic RESET behavior, as confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables.

What thermal protection mechanism does the MAX1976AEZT180+ implement?

The MAX1976AEZT180+ incorporates thermal-overload protection that disables the pass transistor when junction temperature exceeds +165°C. After shutdown, the device re-enables once temperature drops by 15°C (hysteresis), resulting in pulsed output during sustained overload. This prevents permanent damage and is validated in the Thermal Protection section of the datasheet.