Analog Devices Inc./Maxim Integrated MAX1589AETT100+T

Overview

MAX1589AETT100+T from Maxim Integrated is a low-dropout linear regulator with preset 1.0V output, delivering guaranteed 500mA continuous current from 1.62V–3.6V input, featuring ±0.5% initial accuracy, 175mV dropout at full load, and active-low open-drain RESET output asserted for ≥70ms after regulation-designed for power rails in notebook computers and cellular handsets.

For engineers reviewing the MAX1589AETT100+T datasheet, MAX1589AETT100+T pinout, MAX1589AETT100+T application, or MAX1589AETT100+T equivalent, key selection criteria include input voltage headroom down to 1.62V, thermal-overload protection at +165°C, logic-controlled shutdown with <1µA off-state current, and compatibility with 4.7µF ceramic output capacitance for stable transient response.

Technical Context

The MAX1589AETT100+T integrates a p-channel MOSFET pass transistor (R_DS(ON) = 0.33Ω) enabling low dropout and supply current independent of load or dropout voltage. Its error amplifier compares internal reference against feedback from a fixed resistor divider to regulate output precisely.

RESET functionality uses a power-good comparator monitoring V_OUT, asserting low when V_OUT falls below 82.5% of nominal and holding for ≥70ms after recovery; SHDN is active-low with 0.6V V_IL and 1.4V V_IH, supporting direct connection to microcontroller GPIOs.

Key Specifications

Pinout & Package

MAX1589AETT100+T is housed in a 6-pin, 3mm × 3mm thin DFN package with exposed paddle (EP), optimized for thermal dissipation in space-constrained portable designs. GND and EP must be soldered to a large PCB ground plane to sustain full 500mA output at elevated ambient temperatures.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX1589AETT100+T, TPS7A2010PDQNR offers lower dropout and quiescent current but omits RESET-increasing BOM count and complexity-while NCP1117DT10RKG delivers higher current but sacrifices battery efficiency, board area, and system-level supervision capability.

Availability

MAX1589AETT100+T is available at Aetrix Electronics and suitable for notebook computers, cellular handsets, digital still cameras, and PCMCIA card designs requiring stable component supply, long-term lifecycle support, and lead-free compliance.

Supply support for MAX1589AETT100+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 solutions for portable, industrial, and communications systems.

The MAX1589A series belongs to Maxim's ultra-low-input-voltage LDO family, engineered specifically for single-cell Li-ion and Li-polymer battery-powered devices demanding high accuracy, low dropout, and integrated power supervision.

FAQ

What is the exact output voltage of MAX1589AETT100+T?

The MAX1589AETT100+T delivers a factory-trimmed fixed output voltage of 1.0V with ±0.5% initial accuracy over temperature and load. This value is confirmed by the "100" suffix in the part number and verified in the Electrical Characteristics table under Output Voltage Accuracy. The device requires no external resistors to set this voltage, simplifying layout and reducing component count.

Does MAX1589AETT100+T include thermal protection?

Yes, MAX1589AETT100+T incorporates thermal-overload protection that disables the pass transistor when junction temperature exceeds +165°C. It re-enables automatically after cooling by 15°C, producing a pulsed output during sustained overload. This behavior is documented in the Thermal Protection section and ensures safe operation without external circuitry.

What package type is used for MAX1589AETT100+T?

MAX1589AETT100+T uses a 6-pin thin DFN package measuring 3mm × 3mm × 0.8mm with an exposed thermal pad (EP). This package is distinct from the SOT23 variant and is specified in the Ordering Information table as "TDFN". The exposed pad must be soldered to a PCB ground plane to achieve rated 500mA output at elevated temperatures.

Can MAX1589AETT100+T operate from a 1.62V input?

Yes, MAX1589AETT100+T is rated for minimum input voltage of 1.62V, enabling operation directly from partially discharged single-cell Li-ion batteries. At 1.0V output, this yields only 620mV headroom-well within its 175mV dropout specification at light loads-and is validated in Absolute Maximum Ratings and Electrical Characteristics tables.

Is the RESET output of MAX1589AETT100+T push-pull or open-drain?

The RESET output of MAX1589AETT100+T is active-low and open-drain, requiring an external pull-up resistor to the host system's logic rail (e.g., 1.8V or 3.3V). This configuration allows wired-OR reset signaling across multiple supervisors and is explicitly stated in the Pin Description and Applications Information sections.