Analog Devices Inc./Maxim Integrated MAX1963AEZT090+T

Overview

The MAX1963AEZT090+T from Maxim Integrated is a low-dropout linear regulator with preset 0.90V output, delivering guaranteed 300mA continuous current from a 1.62V–3.6V input supply, featuring 100mV dropout at full load and active-low open-drain RESET with 2.2ms delay-designed for power management in portable battery-powered systems such as handheld computers and cellular phones.

For engineers reviewing the MAX1963AEZT090+T datasheet, MAX1963AEZT090+T pinout, MAX1963AEZT090+T application, or MAX1963AEZT090+T equivalent, key selection criteria include input voltage range (1.62V–3.6V), ±0.5% output accuracy over load/line/temp, thermal-overload protection, shutdown quiescent current (<1µA), and compatibility with 4.7µF low-ESR ceramic output capacitance.

Technical Context

The MAX1963AEZT090+T integrates a p-channel MOSFET pass transistor (R_DS(ON) = 0.33Ω) enabling load-independent quiescent current (90µA typ) and low dropout behavior defined by V_DROPOUT = 0.33Ω × I_OUT. Its internal error amplifier compares feedback against a precision reference to regulate output voltage.

RESET functionality monitors V_OUT with 82.5% threshold hysteresis and asserts active-low for ≥2.2ms after regulation is achieved; SHDN input enables logic-controlled shutdown with internal 1.5kΩ pull-down on OUT and active RESET assertion during sleep mode.

Key Specifications

Pinout & Package

MAX1963AEZT090+T uses the 6-pin thin SOT23-6 package (1.6mm × 2.9mm × 1.1mm), optimized for space-constrained portable designs. Thermal performance is enhanced via GND pin acting as heatsink; PCB layout requires soldering GND to large copper area.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A0509PYKAR and MCP1825-0902E/DB, the MAX1963AEZT090+T uniquely combines 300mA capability, 1.62V minimum input, 100mV dropout, and integrated 2.2ms RESET in a thin SOT23 package-making it optimal for battery-critical portable designs requiring both power efficiency and reliable power-on sequencing.

Availability

MAX1963AEZT090+T is available at Aetrix Electronics and suitable for notebook computers, cellular phones, portable audio players, and PCMCIA cards requiring stable component supply with guaranteed long-term manufacturability and RoHS-compliant packaging.

Supply support for MAX1963AEZT090+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.

The MAX1963A series is designed specifically for low-input-voltage, high-accuracy LDO regulation in battery-powered portable equipment-emphasizing ultra-low dropout, minimal quiescent current, and integrated power-good supervision.

FAQ

What is the exact output voltage tolerance of the MAX1963AEZT090+T over temperature and load?

The MAX1963AEZT090+T guarantees ±0.5% output voltage accuracy over the full operating range of -40°C to +85°C, 1mA to 300mA load current, and input voltage from (V_OUT + 0.5V) to +3.6V. This specification is production-tested at +25°C and ensured by design across temperature and line/load variations-critical for powering voltage-sensitive logic cores in portable systems.

Does the MAX1963AEZT090+T require external components for stable operation?

Yes, the MAX1963AEZT090+T requires a 1µF ceramic capacitor between IN and GND, and a 4.7µF low-ESR ceramic capacitor between OUT and GND. These capacitors ensure stability across temperature and load, suppress noise, and improve transient response. ESR must be ≤30mΩ; surface-mount ceramics meeting this spec are widely available and recommended over tantalum or aluminum electrolytics.

How does the RESET output of the MAX1963AEZT090+T behave during power-up and brownout events?

The MAX1963AEZT090+T RESET output is an active-low open-drain signal that remains asserted (low) for ≥2.2ms after V_OUT reaches regulation. It falls immediately if V_OUT drops below 82.5% of 0.90V (i.e., 742.5mV) or during SHDN activation-ensuring robust microprocessor reset during power-up, brownout, and shutdown sequences without external circuitry.

What thermal protection features does the MAX1963AEZT090+T include?

The MAX1963AEZT090+T incorporates thermal-overload protection that disables the pass transistor when junction temperature exceeds +165°C. After shutdown, the device re-enables once temperature cools by 15°C (hysteresis), resulting in pulsed output during sustained overload. This safeguard prevents permanent damage and ensures reliability in compact, poorly ventilated portable enclosures where the MAX1963AEZT090+T is commonly deployed.

Can the MAX1963AEZT090+T operate from a single-cell Li-ion battery throughout its discharge curve?

Yes-the MAX1963AEZT090+T operates from 1.62V to 3.6V input, covering the full useful discharge range of a single-cell Li-ion battery (typically 3.0V to 2.7V under load, down to ~2.5V cutoff). With only 100mV dropout at 300mA, it maintains regulated 0.90V output until battery voltage falls to ~1.0V-enabling extended runtime beyond conventional LDOs with higher dropout.