Analog Devices Inc./Maxim Integrated MAX1589ETT250+T

Overview

MAX1589ETT250+T from Maxim Integrated is a low-dropout linear regulator with integrated reset output, designed for battery-powered portable systems. It delivers 500mA continuous output current at 2.5V with ±0.5% initial accuracy, 175mV dropout at full load, and operates from 1.62V to 3.6V input - enabling operation down to single-cell Li-ion or dual-cell NiMH end-of-life voltage. It powers core logic rails in notebook computers and digital still cameras.

For engineers reviewing the MAX1589ETT250+T datasheet, MAX1589ETT250+T pinout, MAX1589ETT250+T application, or MAX1589ETT250+T equivalent, key selection criteria include guaranteed 500mA output under low-input conditions, active-low open-drain RESET timing (≥70ms delay), thermal-overload protection, and compatibility with 1µF/4.7µF ceramic bypass capacitors.

Technical Context

The MAX1589ETT250+T uses an internal P-channel MOSFET pass transistor (R_DS(ON) = 0.33Ω) to achieve low dropout and supply current independent of load or dropout voltage. Its error amplifier compares a precision reference against a fixed internal feedback divider to regulate the 2.5V output.

It integrates a power-good comparator that asserts the open-drain RESET output when V_OUT falls below 82.5% of nominal (2.0625V), holding it asserted ≥70ms after regulation is restored. Shutdown is logic-controlled via active-low SHDN, reducing quiescent current to <1µA.

Key Specifications

Pinout & Package

MAX1589ETT250+T is housed in a 6-pin 3mm × 3mm thin DFN package with exposed paddle (EP) for thermal dissipation. The package height is <0.8mm, suitable for ultra-thin portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS79525DBVR and MCP1825-2502E/DB, the MAX1589ETT250+T uniquely combines 70ms RESET, 175mV dropout, and ±0.5% accuracy in a single 3mm×3mm DFN - simplifying layout, reducing component count, and maximizing battery runtime in space-constrained portable designs.

Availability

MAX1589ETT250+T is available at Aetrix Electronics and suitable for notebook computers, digital still cameras, and cellular telephones requiring stable component supply across extended production lifecycles.

Supply support for MAX1589ETT250+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 portable applications.

The MAX1589 series targets battery-powered portable equipment, delivering high-accuracy, low-dropout regulation with integrated supervisory functions to minimize external components and PCB area.

FAQ

What is the exact output voltage and tolerance of the MAX1589ETT250+T?

The MAX1589ETT250+T provides a fixed 2.5V output with ±0.5% initial accuracy over temperature and load. This specification is guaranteed at +25°C and maintained within ±1.5% across the full -40°C to +85°C operating range, ensuring reliable operation for voltage-critical logic rails without trimming.

Does the MAX1589ETT250+T require external capacitors, and what values are recommended?

Yes, the MAX1589ETT250+T requires a 1µF ceramic capacitor between IN and GND, and a 4.7µF low-ESR ceramic capacitor between OUT and GND. These values ensure stability across temperature and load, meet transient response requirements, and maintain PSRR performance - as validated in Maxim's typical operating characteristics.

How does the RESET function behave during power-up and brownout events for the MAX1589ETT250+T?

The MAX1589ETT250+T asserts its active-low open-drain RESET output whenever V_OUT falls below 82.5% of nominal (2.0625V), including during power-up, power-down, and brownout. RESET remains asserted for at least 70ms after V_OUT rises above threshold, meeting standard microprocessor reset timing requirements.

What thermal protection features are implemented in the MAX1589ETT250+T?

The MAX1589ETT250+T incorporates thermal-overload protection that disables the pass transistor when junction temperature exceeds +165°C. After shutdown, the device re-enables once temperature drops by 15°C, providing pulsed operation during sustained overload - protecting both the IC and PCB from thermal damage without requiring external circuitry.

Can the MAX1589ETT250+T operate from a single-cell Li-ion battery throughout its discharge curve?

Yes, the MAX1589ETT250+T operates from 1.62V to 3.6V input and maintains 2.5V regulation down to 2.675V input (175mV dropout). This covers the usable range of a single-cell Li-ion battery (2.7V–4.2V), enabling full system operation until battery voltage drops below 2.675V - maximizing runtime per charge.