Analog Devices Inc./Maxim Integrated MAX1976ETT130+

Overview

MAX1976ETT130+ from Maxim Integrated is a low-dropout linear regulator (LDO) delivering 300mA continuous output current with 100mV dropout at full load, ±0.5% output voltage accuracy, and a fixed 1.30V output. It operates from 1.62V to 3.6V input and features 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 cellular handsets.

For engineers reviewing the MAX1976ETT130+ datasheet, MAX1976ETT130+ pinout, MAX1976ETT130+ application, or MAX1976ETT130+ equivalent, key selection criteria include guaranteed 300mA load capability under low-input-voltage conditions (≥1.62V), tight output accuracy across load/line/temperature, integrated reset timing, thermal and short-circuit protection, and compatibility with low-ESR ceramic output capacitors.

Technical Context

The MAX1976ETT130+ uses 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 devices. Its error amplifier compares a trimmed bandgap reference against feedback from the internal voltage divider to regulate the 1.30V output.

RESET functionality is implemented via a dedicated comparator monitoring V_OUT, asserting low when output falls below 82.5% of nominal (1.0725V) and holding for ≥70ms after regulation is achieved. Shutdown is logic-controlled (active-low SHDN), reducing quiescent current to <1µA while pulling RESET low and disconnecting OUT from IN.

Key Specifications

Pinout & Package

MAX1976ETT130+ is housed in a 6-pin 3mm × 3mm thin DFN package (pkg code T633-2), with exposed paddle (EP) soldered to ground for thermal management. Package height is <0.8mm, supporting ultra-thin portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX1963ETT130+, the MAX1976ETT130+ provides significantly longer reset timing for robust boot sequencing, while the XC6219B132MR-G offers lower cost and smaller size at the expense of current capability, protection features, and reset functionality.

Availability

MAX1976ETT130+ is available at Aetrix Electronics and suitable for notebook computers, cellular telephones, and digital cameras requiring stable component supply with RoHS-compliant, lead-free packaging and guaranteed 300mA delivery under low-input-voltage conditions.

Supply support for MAX1976ETT130+ 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, communications, and consumer applications.

The MAX1963/MAX1976 product line targets portable battery-powered equipment, delivering high-accuracy, low-quiescent-current LDO regulation with integrated power-good signaling in ultra-small packages.

FAQ

What is the exact output voltage of the MAX1976ETT130+ and how tightly is it specified?

The MAX1976ETT130+ provides a factory-trimmed fixed output voltage of 1.30V with ±0.5% accuracy over load (1mA–300mA), line (VIN = VOUT + 0.5V to 3.6V), and temperature (–40°C to +85°C). This specification is guaranteed by design and 100% production tested at +25°C, ensuring consistent performance across operating conditions without external feedback components.

Does the MAX1976ETT130+ require external capacitors, and what are the recommended values?

Yes, the MAX1976ETT130+ requires two external ceramic capacitors: a minimum 1µF capacitor between IN and GND, and a 4.7µF low-ESR (≤30mΩ) capacitor between OUT and GND. These are mandatory for stability, transient response, and noise suppression across the full –40°C to +85°C range and up to 300mA load. Placement close to the pins minimizes trace inductance effects.

How does the RESET function behave during power-up and brownout events for the MAX1976ETT130+?

The MAX1976ETT130+ asserts RESET low whenever V_OUT falls below 82.5% of nominal (1.0725V) and holds it asserted for at least 70ms after V_OUT rises above that threshold. During power-up, RESET remains low until regulation is achieved and then stays low for ≥70ms before going high. During brownout, RESET falls immediately upon undervoltage detection - ensuring reliable µP reset across all fault conditions.

What thermal protection mechanism does the MAX1976ETT130+ implement, and at what junction temperature does it activate?

The MAX1976ETT130+ incorporates thermal-overload protection that disables the 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. This hysteresis prevents oscillation and protects the IC during sustained overload or inadequate PCB heatsinking - a critical safeguard in sealed portable enclosures.

Is the MAX1976ETT130+ pin-compatible with other members of the MAX1963/MAX1976 family, and what are the key differences?

Yes, the MAX1976ETT130+ shares identical pinout and package (6-pin TDFN, T633-2) with all MAX1963/MAX1976 variants, including MAX1963ETT130+. The primary functional difference is RESET delay: MAX1976ETT130+ provides ≥70ms, whereas MAX1963ETT130+ provides ≥2.2ms. Output voltage, current capability, and electrical specs are identical for matching suffixes - enabling drop-in replacement where timing permits.