Analog Devices Inc./Maxim Integrated MAX1589ETT120+T

Overview

The MAX1589ETT120+T from Maxim Integrated is a low-dropout linear regulator with integrated reset output, designed for battery-powered portable electronics. It delivers 500mA continuous output current with ±0.5% initial accuracy, 175mV dropout at full load, and operates from 1.62V to 3.6V input - enabling use in ultra-low-voltage systems such as digital still cameras and notebook computers.

For engineers reviewing the MAX1589ETT120+T datasheet, MAX1589ETT120+T pinout, MAX1589ETT120+T application, or MAX1589ETT120+T equivalent, key selection criteria include guaranteed 500mA output under 1.62V minimum input, active-low open-drain RESET timing (≥70ms delay), thermal-overload protection, and compatibility with 3mm × 3mm thin DFN packaging for space-constrained designs.

Technical Context

The MAX1589ETT120+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 internal feedback to regulate output voltage.

It integrates microprocessor supervisory circuitry: RESET asserts low when V_OUT falls below 82.5% of nominal and remains asserted ≥70ms after regulation is restored. Shutdown is logic-controlled via active-low SHDN, reducing supply current to <1µA while pulling OUT to GND through a 1.5kΩ resistor.

Key Specifications

Pinout & Package

MAX1589ETT120+T is packaged in a 6-pin 3mm × 3mm thin DFN (TDFN) with exposed pad (EP), rated for -40°C to +85°C operation. The package height is <0.8mm, optimized 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 TPS7A0512PDBVR and MCP1825-1202E/DB, the MAX1589ETT120+T uniquely combines 500mA capability, integrated RESET, and thermal protection in a thermally enhanced 3mm × 3mm DFN - making it optimal for portable systems requiring robust power sequencing and reliability.

Availability

MAX1589ETT120+T 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 industrial temperature range (-40°C to +85°C).

Supply support for MAX1589ETT120+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 ICs for industrial, communications, and consumer applications.

The MAX1589 series is part of Maxim's low-input-voltage LDO portfolio, engineered specifically for battery-powered portable equipment demanding high accuracy, low dropout, and integrated power supervision in minimal footprint packages.

FAQ

What is the output voltage of the MAX1589ETT120+T?

The MAX1589ETT120+T is factory-trimmed to deliver a precise 1.20V output voltage. This fixed value is confirmed by the "120" suffix in the part number and verified in the Selector Guide and Electrical Characteristics table. The device achieves ±0.5% initial accuracy across temperature and load, ensuring stable biasing for core logic or memory interfaces in the MAX1589ETT120+T application.

Does the MAX1589ETT120+T include a reset output function?

Yes, the MAX1589ETT120+T features an active-low, open-drain RESET output that asserts low during power-up, brownout, or shutdown. RESET remains asserted for at least 70ms after V_OUT reaches regulation and de-asserts within 100ms. This built-in supervisor eliminates the need for external reset ICs in systems using the MAX1589ETT120+T, simplifying BOM and board layout.

What package type is used for the MAX1589ETT120+T?

The MAX1589ETT120+T uses a 6-pin 3mm × 3mm thin DFN (TDFN) package with exposed thermal pad (EP), designated as "T633+2" in Maxim's package coding. Its height is <0.8mm, and the EP must be soldered to a PCB ground plane for thermal performance and EMI control - a key distinction from the SOT23 variants of the MAX1589ETT120+T family.

What is the maximum continuous output current of the MAX1589ETT120+T?

The MAX1589ETT120+T guarantees 500mA continuous output current under specified conditions (T_A = -40°C to +85°C, V_IN ≥ V_OUT + 0.5V). Its current limit is typically 850mA, providing headroom for transient surges. Thermal limits in the TDFN package allow sustained 500mA operation even near dropout - a capability validated in Figure 3 of the MAX1589ETT120+T datasheet.

How does the MAX1589ETT120+T handle thermal overload?

The MAX1589ETT120+T incorporates thermal-overload protection that disables the pass transistor when junction temperature exceeds +165°C. After cooling by 15°C, it automatically resumes operation, producing a pulsed output during sustained overload. This self-protecting behavior prevents permanent damage and maintains system integrity - a critical feature for unattended operation in the MAX1589ETT120+T application environment.