Analog Devices Inc./Maxim Integrated MAX1589ETT250+

Overview

The MAX1589ETT250+ from Maxim Integrated is a low-dropout linear regulator with integrated active-low open-drain RESET output, designed for battery-powered portable electronics. It delivers 500mA continuous output current at a preset 2.5V output voltage with ±0.5% initial accuracy, 175mV dropout at full load, and operates from a 1.62V–3.6V input supply-enabling operation down to single-cell Li-ion or Li-poly end-of-life voltages in notebook computers and digital still cameras.

For engineers reviewing the MAX1589ETT250+ datasheet, MAX1589ETT250+ pinout, MAX1589ETT250+ application, or MAX1589ETT250+ equivalent, key selection criteria include guaranteed 500mA output under low-input conditions, 70ms RESET assertion delay after power-up, thermal-overload and short-circuit protection, logic-controlled shutdown with sub-1µA off-state current, and compatibility with low-ESR ceramic capacitors (1µF IN / 4.7µF OUT).

Technical Context

The MAX1589ETT250+ employs 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 bandgap reference against a fixed internal feedback divider to regulate the 2.5V output.

RESET functionality is implemented via a dedicated power-good comparator monitoring V_OUT, asserting low when V_OUT falls below 82.5% of nominal and holding for ≥70ms after recovery. Shutdown control disables the pass device, pulls OUT to GND via a 1.5kΩ resistor, and forces RESET low.

Key Specifications

Pinout & Package

The MAX1589ETT250+ is housed in a 6-pin 3mm × 3mm thin DFN package with exposed paddle (EP), measuring <0.8mm height and optimized for thermal performance on compact PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS79525DBVR and MCP1825-2502E/DB, the MAX1589ETT250+ uniquely combines ultra-low 1.62V input capability, precise 70ms active-low RESET, and sub-1µA shutdown current-making it optimal for space-constrained, battery-critical applications where every millivolt and microamp matters.

Availability

MAX1589ETT250+ is available at Aetrix Electronics and suitable for notebook computers, digital still cameras, and cellular telephones requiring stable component supply with RoHS-compliant, lead-free packaging and guaranteed long-term availability.

Supply support for MAX1589ETT250+ 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 product line delivers low-input-voltage, high-accuracy LDO regulators with integrated power-supervision features-specifically engineered for battery-powered portable equipment where efficiency, small size, and reliability are critical.

FAQ

What is the output voltage tolerance of the MAX1589ETT250+ over temperature and load?

The MAX1589ETT250+ maintains ±0.5% initial output voltage accuracy at +25°C. Over the full -40°C to +85°C operating range and 1mA–500mA load, total output voltage variation is guaranteed within ±1.5%, as confirmed by electrical characteristics tables and typical curves showing <0.2% drift across temperature and load for the 2.5V variant. This ensures robust regulation for sensitive digital loads without external trimming.

Does the MAX1589ETT250+ require external components for stable operation?

Yes-the MAX1589ETT250+ requires a 1µF ceramic capacitor between IN and GND, and a 4.7µF low-ESR (≤30mΩ) ceramic capacitor between OUT and GND. These are mandatory for stability, transient response, and PSRR performance across temperature and load. The I.C. pin is internally connected and may be left floating or tied to GND; no other external components are needed for basic regulation or RESET functionality.

How does the RESET function behave during input undervoltage or shutdown?

The MAX1589ETT250+ asserts RESET low whenever V_OUT drops below 82.5% of 2.5V (i.e., <2.0625V), including during input undervoltage (VIN < 1.62V), brownout, or active shutdown. RESET remains asserted for ≥70ms after V_OUT recovers to regulation and falls immediately upon SHDN activation-ensuring deterministic reset signaling for microprocessors regardless of fault origin.

What thermal performance can be expected from the MAX1589ETT250+ in its TDFN package?

In the 3mm × 3mm TDFN package, the MAX1589ETT250+ achieves a typical θ_JA of 41°C/W when mounted on a 1in² 1oz copper pad. At T_A = +70°C, maximum power dissipation is 1.951W. With 500mA load and 1.0V dropout (VIN = 3.5V), power dissipation is 0.5W-well within safe limits, allowing continuous operation without thermal throttling in properly laid-out PCBs.

Is the MAX1589ETT250+ pin-compatible with other variants in the MAX1589 family?

Yes-the MAX1589ETT250+ shares identical pinout, footprint, and package dimensions (6-pin 3mm × 3mm TDFN) with all other MAX1589ETT-x variants (e.g., MAX1589ETT180+, MAX1589ETT300+). Only the output voltage and top-marking differ; no PCB redesign is needed when selecting alternate fixed-output versions within the same TDFN package.