Analog Devices Inc./Maxim Integrated MAX1589ETT100+T

Overview

MAX1589ETT100+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 ±0.5% initial accuracy, operates from 1.62V to 3.6V input, and features 175mV dropout at full load - enabling extended runtime in PDAs, digital cameras, and cellular handsets.

For engineers reviewing the MAX1589ETT100+T datasheet, MAX1589ETT100+T pinout, MAX1589ETT100+T application, or MAX1589ETT100+T equivalent, key selection criteria include guaranteed 500mA load capability under low-input-voltage conditions (≥1.62V), active-low open-drain RESET timing (≥70ms delay), and thermal/short-circuit protection - all in a space-constrained 3mm × 3mm TDFN package.

Technical Context

The MAX1589ETT100+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 output voltage.

RESET functionality is implemented via a dedicated power-good comparator monitoring V_OUT; it asserts low when V_OUT falls below 82.5% of nominal and remains asserted ≥70ms after regulation is restored. Shutdown control is active-low and disconnects the output while pulling it to GND via a 1.5kΩ resistor.

Key Specifications

Pinout & Package

MAX1589ETT100+T is housed in a 6-pin, 3mm × 3mm thin DFN package with exposed paddle (EP) for thermal enhancement. 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 applications.

Compared with TPS79510DRVR and MCP1826T-1002E/DB, MAX1589ETT100+T uniquely combines 1.62V minimum input, 175mV dropout, ±0.5% accuracy, and integrated RESET in a 3mm × 3mm DFN - making it the only option that satisfies all four requirements simultaneously for space-constrained, single-cell portable designs.

Availability

MAX1589ETT100+T is available at Aetrix Electronics and suitable for notebook computers, cellular telephones, and digital still cameras requiring stable component supply across production lifecycles and seasonal demand fluctuations.

Supply support for MAX1589ETT100+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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and consumer applications.

The MAX1589 series was developed specifically for ultra-low-input-voltage, high-current portable power management - targeting battery-powered devices where every millivolt of dropout and microamp of quiescent current directly impacts runtime and thermal design.

FAQ

What is the exact output voltage of MAX1589ETT100+T?

The MAX1589ETT100+T has a factory-preset output voltage of 1.00V, achieved through internal laser trimming. This value is guaranteed within ±0.5% initial accuracy over temperature and load, and does not require external resistors or configuration pins. The "100" suffix in the part number explicitly denotes the 1.00V variant per Maxim's Selector Guide.

Does MAX1589ETT100+T include thermal protection?

Yes, MAX1589ETT100+T incorporates thermal-overload protection that disables the pass transistor when junction temperature exceeds +165°C. After shutdown, the device automatically recovers once the die cools by 15°C, resulting in pulsed output during sustained overload. This feature prevents permanent damage and is fully specified in the Absolute Maximum Ratings and Electrical Characteristics tables.

Can MAX1589ETT100+T operate from a single-cell Li-ion battery?

Yes, MAX1589ETT100+T is explicitly designed for single-cell Li-ion and Li-polymer batteries, supporting input voltages as low as 1.62V. With its 175mV dropout at 500mA, it maintains regulation down to 1.175V input - well within the 2.5V–4.2V discharge curve of a typical Li-ion cell, maximizing usable capacity.

What is the function of the I.C. pin on MAX1589ETT100+T?

The I.C. pin (Pin 5) on MAX1589ETT100+T is internally connected and serves no external function. Maxim's Pin Description section states it should be left floating or tied to GND - no active circuitry connects to this terminal, and it does not affect regulation, RESET, or shutdown behavior of the MAX1589ETT100+T.

Is the RESET output of MAX1589ETT100+T compatible with standard microcontroller reset inputs?

Yes, the RESET output of MAX1589ETT100+T is an active-low, open-drain signal with guaranteed low-voltage specification (≤3mV at 100µA sink current) and ≥70ms assertion time after power-up. It requires only an external pull-up resistor to the host µP's V_DD rail and is electrically compatible with all standard CMOS and TTL reset inputs found on ARM Cortex-M, PIC, and MSP430 microcontrollers.