Analog Devices Inc./Maxim Integrated MAX1976ETT120+

Overview

MAX1976ETT120+ from Maxim Integrated is a low-dropout linear regulator delivering 300mA continuous output current with ±0.5% output voltage accuracy, 100mV dropout at full load, and a fixed 1.20V output voltage. It operates from +1.62V to +3.6V input and integrates an active-low open-drain RESET output with 70ms delay, making it suitable for power sequencing in portable battery-powered systems such as notebook computers and handheld devices.

For engineers reviewing the MAX1976ETT120+ datasheet, MAX1976ETT120+ pinout, MAX1976ETT120+ application, or MAX1976ETT120+ equivalent, key selection criteria include guaranteed 300mA load capability under low-input-voltage conditions (≥1.62V), thermal-overload and short-circuit protection, logic-controlled shutdown, and compatibility with low-ESR ceramic output capacitors (4.7µF) for stable transient response.

Technical Context

The MAX1976ETT120+ employs an internal 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 applications. Its error amplifier compares a trimmed reference against feedback from a fixed internal divider to regulate the 1.20V output.

RESET functionality is implemented via a dedicated comparator monitoring V_OUT, asserting low when output falls below 82.5% of nominal (±1.7% hysteresis) and holding for ≥70ms after regulation is achieved. Shutdown is controlled by an active-low SHDN pin that reduces quiescent current to <1µA and actively pulls OUT to GND.

Key Specifications

Pinout & Package

MAX1976ETT120+ is housed in a 6-pin 3mm × 3mm thin DFN package (pkg code T633-2), with exposed paddle (EP) connected to GND for thermal dissipation. The package height is <0.8mm, optimized for space-constrained portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6219B122MR-G and ADP125ARHZ-1.2-R7, the MAX1976ETT120+ uniquely integrates a 70ms RESET output and maintains 100mV dropout at 300mA-enabling simpler, more reliable power sequencing in space- and battery-life-constrained portable designs without adding discrete supervision components.

Availability

MAX1976ETT120+ is available at Aetrix Electronics and suitable for notebook computers, cellular telephones, and personal digital assistants requiring stable component supply with RoHS-compliant, lead-free packaging and guaranteed long-term availability.

Supply support for MAX1976ETT120+ 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, and consumer applications.

The MAX1963/MAX1976 product line was designed specifically for low-input-voltage, battery-powered portable electronics requiring high accuracy, low dropout, and integrated power-good signaling in ultra-small packages.

FAQ

What is the output voltage tolerance of the MAX1976ETT120+ over temperature and load?

The MAX1976ETT120+ features ±0.5% output voltage accuracy over load (1mA–300mA), line (VIN = VOUT + 0.5V to +3.6V), and temperature (–40°C to +85°C). This tight tolerance ensures reliable operation of 1.2V-sensitive logic without external trimming or feedback adjustment. The MAX1976ETT120+ achieves this using factory-trimmed internal resistors and a precision bandgap reference.

Does the MAX1976ETT120+ require external components for stable operation?

Yes-the MAX1976ETT120+ requires a 1µF ceramic capacitor between IN and GND, and a 4.7µF low-ESR (≤30mΩ) ceramic capacitor between OUT and GND. These are mandatory for stability, transient response, and PSRR performance across –40°C to +85°C. The MAX1976ETT120+ will not meet datasheet specifications without them.

How does the RESET output of the MAX1976ETT120+ behave during shutdown?

When SHDN is pulled low, the MAX1976ETT120+ immediately asserts RESET (drives it low) and disconnects OUT from IN. RESET remains asserted throughout shutdown and only deasserts ≥70ms after VOUT rises above 82.5% of 1.20V upon subsequent turn-on. This behavior is intrinsic to the MAX1976ETT120+ design and requires no external timing components.

What thermal protection mechanism does the MAX1976ETT120+ use?

The MAX1976ETT120+ incorporates thermal-overload protection that disables the pass transistor when junction temperature exceeds +165°C. After cooling by 15°C, it automatically resumes regulation-resulting in pulsed output during sustained overload. This protects the MAX1976ETT120+ from permanent damage while maintaining safe operating limits in compact layouts.

Is the MAX1976ETT120+ pin-compatible with other members of the MAX1963/MAX1976 family?

Yes-the MAX1976ETT120+ shares identical pinout and package (6-pin TDFN, T633-2) with all MAX1976 variants in TDFN format, including MAX1976ETT075+, MAX1976ETT150+, and MAX1976ETT300+. Output voltage is set internally; no external feedback resistors are used, so board-level compatibility is maintained across the family.