Analog Devices Inc./Maxim Integrated MAX1976ETT150+

Overview

MAX1976ETT150+ from Maxim Integrated is a low-dropout linear regulator delivering 300mA continuous output current with ±0.5% output voltage accuracy at 1.50V, 100mV dropout at full load, and a 70ms active-low open-drain RESET flag. It operates from 1.62V to 3.6V input and targets power rails in portable battery-powered systems such as notebook computers and cellular handsets.

For engineers reviewing the MAX1976ETT150+ datasheet, MAX1976ETT150+ pinout, MAX1976ETT150+ application, or MAX1976ETT150+ equivalent, key selection criteria include guaranteed 300mA load capability under low-input-voltage conditions (≥1.62V), precise 1.50V output with ±0.5% tolerance over temperature/load/line, integrated thermal and short-circuit protection, and the 70ms RESET delay timing critical for microprocessor supervision.

Technical Context

The MAX1976ETT150+ uses an internal P-channel MOSFET pass transistor (R_DS(ON) = 0.33Ω) enabling supply current independence from load and dropout voltage - a key differentiator from PNP-based LDOs. Its error amplifier compares a stable reference against feedback from an internal voltage divider to regulate the 1.50V output.

RESET assertion is triggered when V_OUT falls below 82.5% of nominal (1.2375V), remains asserted for ≥70ms after regulation is achieved, and responds immediately to shutdown or brownout. Thermal shutdown activates at +165°C with 15°C hysteresis, and current limiting trips at ≥450mA.

Key Specifications

Pinout & Package

MAX1976ETT150+ 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, suitable 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 MAX1963ETT150+, MAX1976ETT150+ provides longer reset timing essential for robust microprocessor initialization, while both share identical regulation performance and footprint. Against XC6219B152MR-G, MAX1976ETT150+ delivers double the current, tighter voltage accuracy, and integrated supervision - making it suitable for higher-performance portable systems.

Availability

MAX1976ETT150+ is available at Aetrix Electronics and suitable for notebook computers, cellular telephones, and digital cameras requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.

Supply support for MAX1976ETT150+ 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 markets.

The MAX1963/MAX1976 product line was designed specifically for ultra-low-input-voltage, high-accuracy LDO regulation in space- and power-constrained portable electronics - emphasizing minimal dropout, precise output, and integrated power-good supervision.

FAQ

What is the output voltage tolerance of the MAX1976ETT150+ over temperature and load?

The MAX1976ETT150+ features a factory-trimmed 1.50V output with ±0.5% accuracy guaranteed over -40°C to +85°C, 1mA to 300mA load, and input voltage from (V_OUT + 0.5V) to +3.6V. This specification is validated by 100% production testing at +25°C and guaranteed by design across the full operating range - critical for maintaining compliance with JEDEC and industry-standard I/O voltage margins in portable systems.

Does the MAX1976ETT150+ require external capacitors, and what values are recommended?

Yes, the MAX1976ETT150+ requires two external ceramic capacitors: a minimum 1µF capacitor between IN and GND, and a 4.7µF low-ESR (≤30mΩ) ceramic capacitor between OUT and GND. These values ensure stability across temperature and load, optimize transient response, and maintain PSRR performance. Larger output capacitance improves noise filtering but must retain low ESR to avoid instability - surface-mount X5R/X7R types are recommended and must be placed adjacent to the MAX1976ETT150+ pins.

How does the RESET function behave during power-up and brownout events for the MAX1976ETT150+?

The MAX1976ETT150+ RESET output is an open-drain, active-low signal that asserts (goes low) whenever V_OUT falls below 82.5% of its nominal value (1.2375V). On power-up, RESET remains asserted for ≥70ms after V_OUT reaches regulation. During brownout or shutdown, RESET deasserts immediately. This behavior ensures reliable microprocessor reset signaling without external components - and the 70ms delay meets common ARM and x86 embedded controller timing requirements.

Can the MAX1976ETT150+ be used in place of the MAX1963ETT150+?

The MAX1976ETT150+ is not a direct drop-in replacement for the MAX1963ETT150+ due to differing RESET timing: MAX1976ETT150+ provides 70ms minimum delay versus 2.2ms for MAX1963ETT150+. While pinout, output voltage, and regulation specs match exactly, firmware relying on the shorter reset pulse may fail to initialize correctly. System validation is required before substitution - MAX1976ETT150+ should only replace MAX1963ETT150+ when extended reset hold time is acceptable or required.

What thermal considerations apply to the MAX1976ETT150+ in the 3mm × 3mm TDFN package?

The MAX1976ETT150+ in TDFN (T633-2) has a thermal resistance θ_JA dependent on PCB layout; its exposed paddle (EP) must be soldered to a large copper ground plane to achieve rated 1951mW power dissipation at +70°C ambient. Without adequate heatsinking, thermal shutdown triggers at +165°C junction temperature. For continuous 300mA operation at 3.6V input, keep (V_IN – 1.5V) × 300mA ≤ 630mW and verify board-level thermal performance using IR imaging or junction-to-ambient modeling.