Analog Devices Inc./Maxim Integrated MAX1976AEZT150+

Overview

MAX1976AEZT150+ from Maxim Integrated is a low-dropout linear regulator with preset 1.5V output, delivering guaranteed 300mA continuous load current from a 1.62V–3.6V input supply while maintaining only 100mV dropout at full load. It features an active-low open-drain RESET output with 70ms delay after regulation, ±0.5% output accuracy over load/line/temperature, and thermal/short-circuit protection - deployed in portable battery-powered systems such as handheld computers and smart phones.

For engineers reviewing the MAX1976AEZT150+ datasheet, MAX1976AEZT150+ pinout, MAX1976AEZT150+ application, or MAX1976AEZT150+ equivalent, key selection considerations include its 1.5V fixed output, 70ms reset timeout (distinct from MAX1963A's 2.2ms), SOT23-6 package footprint, pMOS pass transistor architecture enabling load-independent quiescent current, and compatibility with low-ESR ceramic capacitors for stable operation down to 1.62V input.

Technical Context

The MAX1976AEZT150+ uses an internal p-channel MOSFET pass transistor (R_DS(ON) = 0.33Ω) to achieve low dropout and eliminate base-drive current dependency, resulting in 90µA typical ground current under 300mA load and in dropout. Its error amplifier compares a trimmed bandgap reference against a resistive feedback network to regulate output voltage with ±0.5% initial accuracy.

A dedicated power-good comparator monitors V_OUT, asserting the open-drain RESET output low until V_OUT reaches ≥82.5% of nominal and remains asserted for ≥70ms thereafter; RESET falls immediately if V_OUT drops below threshold or SHDN is pulled low. Thermal shutdown activates at +165°C with 15°C hysteresis, and current limiting engages at ≥450mA (min).

Key Specifications

Pinout & Package

MAX1976AEZT150+ is housed in a 6-pin thin SOT23-6 package (1.6mm × 2.9mm × 1.1mm max height), with exposed die pad not present. Pin 1 is marked by a dot; the package is lead (Pb)-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX1963AEZT150+, the MAX1976AEZT150+ offers longer reset assertion for robust boot sequencing, while versus XC6219B152MR-G it integrates critical power-good signaling without adding component count or routing complexity.

Availability

MAX1976AEZT150+ is available at Aetrix Electronics and suitable for smartphone core power, handheld computer I/O rails, DSC image sensor bias, and PCMCIA card logic supply requiring stable component supply, long-lifecycle availability, and RoHS-compliant packaging.

Supply support for MAX1976AEZT150+ 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 ultra-low-input-voltage LDOs with integrated RESET for battery-powered systems where input can dip below 1.8V - targeting space-constrained, energy-sensitive devices like smartphones and handheld computers.

FAQ

What is the output voltage of the MAX1976AEZT150+?

The MAX1976AEZT150+ has a factory-trimmed fixed output voltage of 1.5V. This value is laser-adjusted during production and does not require external resistors. The device maintains ±0.5% accuracy at +25°C and ±2.5% over full load, line, and temperature ranges (-40°C to +85°C), making it suitable for powering core logic and I/O domains in portable electronics where tight voltage tolerance is essential. The MAX1976AEZT150+ datasheet confirms this specification in the Electrical Characteristics table under "Output Voltage Accuracy".

How does the RESET function work on the MAX1976AEZT150+?

The MAX1976AEZT150+ features an active-low, open-drain RESET output that asserts low during power-up until the output voltage reaches ≥82.5% of 1.5V (i.e., ≥1.2375V) and remains asserted for a minimum of 70ms thereafter. RESET falls immediately if VOUT drops below threshold or if SHDN is pulled low. This 70ms delay is a key differentiator from the MAX1963A (2.2ms) and ensures reliable microcontroller initialization in systems with slower clock startup or firmware loading sequences. The MAX1976AEZT150+ RESET pin requires an external pull-up resistor to the monitored rail or host supply.

What package type is used for the MAX1976AEZT150+?

The MAX1976AEZT150+ is packaged in a 6-pin thin SOT23-6 (also labeled EZT) package measuring 1.6mm × 2.9mm × 1.1mm maximum height. It conforms to JEDEC MO-178 standards, features gull-wing leads, and is lead-free/RoHS-compliant. Unlike TDFN variants of the MAX1976A family, the MAX1976AEZT150+ does not include an exposed thermal pad. The pinout matches standard SOT23-6 orientation with IN at Pin 1, GND at Pin 2, SHDN at Pin 3, RESET at Pin 4, I.C. at Pin 5, and OUT at Pin 6 - verified in the "Pin Configurations" section of the MAX1976AEZT150+ datasheet.

Can the MAX1976AEZT150+ operate from a single-cell lithium battery?

Yes, the MAX1976AEZT150+ operates from an input voltage range of +1.62V to +3.6V, fully supporting single-cell Li-ion (2.7V–4.2V) and Li-polymer batteries throughout their discharge curve. Its 100mV dropout at 300mA allows regulation down to ~1.6V input - extending usable runtime beyond what conventional PNP-based LDOs achieve. When paired with a 1µF input and 4.7µF output ceramic capacitor, the MAX1976AEZT150+ maintains stability even at end-of-discharge voltages near 1.62V, as validated in the "Operating Region and Power Dissipation" section of the MAX1976AEZT150+ datasheet.

Does the MAX1976AEZT150+ include thermal protection?

Yes, the MAX1976AEZT150+ incorporates thermal-overload protection that disables the pMOS pass transistor when the junction temperature exceeds +165°C. After shutdown, the device remains off until the junction cools by 15°C (to ~+150°C), at which point it resumes regulation - creating a pulsed output under sustained overload. This feature prevents permanent damage during fault conditions such as excessive ambient temperature, high power dissipation, or inadequate PCB copper area. The MAX1976AEZT150+ absolute maximum rating specifies +150°C as the maximum allowable continuous junction temperature, reinforcing the need for proper thermal design using the SOT23-6 GND pad.