Analog Devices Inc./Maxim Integrated MAX1963AEZT120+T

Overview

MAX1963AEZT120+T from Maxim Integrated is a low-dropout linear regulator with preset 1.20V output, delivering guaranteed 300mA continuous current from a +1.62V to +3.6V input supply while maintaining only 100mV dropout at full load and ±0.5% output voltage accuracy over temperature. It integrates an active-low open-drain RESET output with 2.2ms delay and operates in the -40°C to +85°C industrial range using a 6-pin thin SOT23-6 package - ideal for space-constrained portable battery-powered systems requiring precise, low-voltage rail regulation.

For engineers reviewing the MAX1963AEZT120+T datasheet, MAX1963AEZT120+T pinout, MAX1963AEZT120+T application, or MAX1963AEZT120+T equivalent, key selection criteria include its 1.20V fixed output, 100mV dropout at 300mA, ±0.5% accuracy over load/line/temp, 2.2ms RESET assertion time, and compatibility with 1µF input / 4.7µF output ceramic capacitors for stable operation in handheld and embedded power rails.

Technical Context

The MAX1963AEZT120+T employs an internal p-channel MOSFET pass transistor (R_DS(ON) = 0.33Ω) enabling supply current independence from load and dropout voltage, with typical ground current of 90µA under full 300mA load and 70µA in dropout. Its error amplifier compares a trimmed bandgap reference against internal feedback to regulate output, while a dedicated power-good comparator drives the open-drain RESET output based on V_OUT falling below 82.5% of nominal.

Shutdown is logic-controlled via active-low SHDN, reducing supply current to <1µA while actively pulling OUT to GND through a 1.5kΩ resistor and asserting RESET low. Thermal protection activates at +165°C junction temperature with 15°C hysteresis, enabling pulsed operation during sustained overload without device damage.

Key Specifications

Pinout & Package

MAX1963AEZT120+T is housed in a 6-pin thin SOT23-6 package (1.6mm × 2.9mm × 1.1mm), optimized for high-density PCB layouts in portable electronics. The exposed pad is not present in this variant; thermal management relies on soldering pins 2 (GND) and 5 (I.C.) to copper pour.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX1963AEZT120+T, the XC6210B122MR-G offers lower BOM count for basic regulation but lacks RESET integration, while the ADP125ARHZ-1.2-R7 provides greater current headroom at the expense of missing supervision - making MAX1963AEZT120+T optimal where compact, self-contained 300mA/RESET LDO functionality is required.

Availability

MAX1963AEZT120+T is available at Aetrix Electronics and suitable for smartphone application processor core rails, wearable sensor hub power, industrial IoT edge node MCU rails, and medical portable diagnostic device logic rails requiring stable component supply with guaranteed long-term availability.

Supply support for MAX1963AEZT120+T 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 communications applications.

The MAX1963A family targets battery-powered portable equipment requiring low-input-voltage, high-accuracy LDOs with integrated power-good supervision - specifically engineered for notebook/handheld computers, cellular/smartphones, and PCMCIA cards.

FAQ

What is the exact output voltage of the MAX1963AEZT120+T?

The MAX1963AEZT120+T delivers a factory-trimmed fixed output voltage of 1.20V. This value is laser-trimmed during production and guaranteed within ±0.5% at +25°C and ±2.5% over the full -40°C to +85°C operating temperature range, eliminating the need for external feedback resistors.

Does the MAX1963AEZT120+T require external capacitors, and what values are recommended?

Yes, the MAX1963AEZT120+T requires two external ceramic capacitors: a minimum 1µF capacitor between IN and GND, and a minimum 4.7µF low-ESR (≤30mΩ) capacitor between OUT and GND. These values ensure stability, adequate load-transient response, and optimal PSRR performance across the full operating temperature and load range.

How does the RESET output of the MAX1963AEZT120+T behave during power-up and brownout?

The RESET output of the MAX1963AEZT120+T is an active-low open-drain signal that remains asserted (low) until the output voltage reaches regulation and stays within 82.5% of 1.20V. It asserts again immediately if V_OUT drops below that threshold, and remains asserted for at least 2.2ms after recovery - meeting standard µP reset timing requirements.

What thermal protection features does the MAX1963AEZT120+T include?

The MAX1963AEZT120+T incorporates thermal-overload protection that disables the pass transistor when junction temperature exceeds +165°C. After cooling by 15°C, it automatically resumes regulation. This hysteresis prevents latch-up and enables safe pulsed operation during sustained overload, protecting both the MAX1963AEZT120+T and downstream circuitry.

Can the MAX1963AEZT120+T operate from a single-cell Li-ion battery throughout its discharge curve?

Yes - the MAX1963AEZT120+T supports input voltages from +1.62V to +3.6V and maintains regulation down to VIN = VOUT + 100mV = 1.30V. Since a single-cell Li-ion battery discharges from ~4.2V to ~2.7V, the MAX1963AEZT120+T fully covers the usable range and continues delivering 1.20V until the battery reaches ~1.30V, maximizing energy extraction.