Analog Devices Inc./Maxim Integrated MAX1589EZT300+

Overview

The MAX1589EZT300+ from Maxim Integrated is a low-dropout linear regulator with preset 3.0V output, delivering guaranteed 500mA continuous current from a 1.62V–3.6V input supply and featuring 175mV dropout at full load, ±0.5% initial output accuracy, and an active-low open-drain RESET output asserted for ≥70ms after regulation - deployed in portable battery-powered systems including notebook computers and cellular handsets.

For engineers reviewing the MAX1589EZT300+ datasheet, MAX1589EZT300+ pinout, MAX1589EZT300+ application, or MAX1589EZT300+ equivalent, key selection criteria include low-input-voltage operation down to 1.62V, thermal-overload and short-circuit protection, logic-controlled shutdown with sub-1µA off-state current, and compatibility with 1µF/4.7µF ceramic bypass capacitors for stable 500mA delivery.

Technical Context

The MAX1589EZT300+ uses an internal P-channel MOSFET pass transistor (R_DS(ON) = 0.33Ω) enabling low quiescent current (90µA typ at 500mA) independent of load and dropout voltage. Its error amplifier compares a precision reference against a fixed internal feedback divider to regulate the 3.0V output.

RESET functionality is implemented via a power-good comparator monitoring V_OUT, asserting low when V_OUT falls below 82.5% of nominal (2.475V), with 70–160ms delay on power-up. Shutdown disables the pass device, pulls OUT to GND via 1.5kΩ, and forces RESET low.

Key Specifications

Pinout & Package

MAX1589EZT300+ is housed in a 6-pin thin SOT23 package (1.0mm height, JEDEC MO-178AA), with exposed pad not present. Pin 1 is marked by a dot; pin numbering follows standard SOT23 counterclockwise from the mark.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6219B302MR-G and ADP160AUJZ-3.0-R7, the MAX1589EZT300+ uniquely combines 500mA capability, 1.62V minimum input, integrated RESET, and thermal protection in a 6-pin SOT23 - making it the sole option for space-constrained, battery-critical designs requiring full supervision and robustness.

Availability

MAX1589EZT300+ is available at Aetrix Electronics and suitable for notebook computers, cellular telephones, and digital still cameras requiring stable component supply with RoHS/lead-free compliance and extended temperature support (-40°C to +85°C).

Supply support for MAX1589EZT300+ 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 was engineered specifically for low-input-voltage, high-current LDO regulation in battery-powered handheld equipment - prioritizing ultra-low dropout, minimal quiescent current, and integrated power-supervision functions.

FAQ

What is the exact output voltage tolerance of the MAX1589EZT300+ over temperature and load?

The MAX1589EZT300+ guarantees ±0.5% initial output accuracy at +25°C and ±1.5% over the full -40°C to +85°C range and 1mA–500mA load. This is confirmed in the Electrical Characteristics table under "Output Voltage Accuracy" with conditions VIN = (VOUT + 0.5V) to +3.6V and IOUT = 1mA to 500mA. The MAX1589EZT300+ achieves this via laser-trimmed internal feedback, eliminating need for external resistors.

Does the MAX1589EZT300+ require external components for stable operation?

Yes - the MAX1589EZT300+ requires a 1µF ceramic capacitor between IN and GND, and a 4.7µF low-ESR ceramic capacitor between OUT and GND. These are mandatory for stability across temperature and load per the Capacitor Selection section. The MAX1589EZT300+ will oscillate or exhibit poor transient response without them, especially at 500mA loads.

How does the RESET output behave during shutdown or brownout?

During shutdown (SHDN = GND), the MAX1589EZT300+ actively pulls RESET low. During brownout (VOUT falling below 82.5% of 3.0V = 2.475V), RESET asserts low immediately with no delay. On power-up, RESET remains low for ≥70ms after VOUT reaches regulation - ensuring reliable µP reset timing. This behavior is inherent to the MAX1589EZT300+'s internal supervisory circuitry.

What thermal limitations apply to the MAX1589EZT300+ in SOT23 package?

In the 6-pin thin SOT23 package, the MAX1589EZT300+ has a maximum power dissipation of 727mW at +70°C ambient, derating 9.1mW/°C above that. At 500mA and 3.6V input (3.0V output), power dissipation is 300mW - well within limits if PCB copper area is adequate. Thermal shutdown activates at +165°C junction temperature, with 15°C hysteresis, protecting the MAX1589EZT300+ during sustained overload.

Is the MAX1589EZT300+ pin-compatible with other variants in the MAX1589 family?

Yes - all MAX1589 variants (e.g., MAX1589EZT180+, MAX1589ETT300+) share identical 6-pin SOT23 or 6-pin TDFN pinouts and functions. The MAX1589EZT300+ uses the same IN/GND/SHDN/RESET/I.C./OUT assignment as every other member, allowing drop-in replacement across output voltages and packages when board layout permits mechanical fit.