Analog Devices Inc./Maxim Integrated MAX1589EZT130+

Overview

The MAX1589EZT130+ from Maxim Integrated is a low-dropout linear regulator with preset 1.3V output, delivering guaranteed 500mA continuous current from a 1.62V–3.6V input supply while maintaining ±0.5% initial accuracy and 175mV dropout at full load. It integrates an active-low open-drain RESET output asserted for ≥70ms after regulation, logic-controlled shutdown, and thermal/short-circuit protection - designed for power management in space-constrained portable systems.

For engineers reviewing the MAX1589EZT130+ datasheet, MAX1589EZT130+ pinout, MAX1589EZT130+ application, or MAX1589EZT130+ equivalent, key selection considerations include its 1.3V fixed output, thin SOT23-6 RoHS-compliant package (1.0mm height), low-quiescent-current operation (90µA typ at 500mA), and integrated reset supervision for microprocessor power sequencing in battery-powered devices.

Technical Context

The MAX1589EZT130+ employs an internal P-channel MOSFET pass transistor (R_DS(ON) = 0.33Ω) to achieve low dropout and supply current independent of load or input-output differential. Its error amplifier compares a precision reference against internal feedback to regulate output voltage, while the power-good comparator monitors V_OUT to drive the RESET signal.

Shutdown is controlled via an active-low SHDN pin that disconnects OUT from IN, pulls OUT to GND through a 1.5kΩ resistor, and reduces supply current to <1µA. The RESET output remains asserted during power-up, brownout (down to +1V input), and shutdown, with 82.5% nominal V_OUT threshold and 15°C thermal hysteresis for reliable system initialization.

Key Specifications

Pinout & Package

MAX1589EZT130+ uses the 6-pin thin SOT23-6 package (1.0mm max height, JEDEC MO-178AA), with exposed die pad not present - thermal dissipation relies on GND pin soldering to PCB copper area. Pin 5 is internally connected (I.C.) and must be left floating or tied to GND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6219B132MR-G and ADP160AUJZ-1.3-R7, the MAX1589EZT130+ uniquely combines 500mA delivery, 175mV dropout, integrated RESET, and shutdown in a RoHS-compliant thin SOT23-6 - making it the sole option among these three for space-constrained, high-reliability portable systems requiring full power-management integration.

Availability

MAX1589EZT130+ is available at Aetrix Electronics and suitable for notebook computers, cellular telephones, and digital still cameras requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for MAX1589EZT130+ 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 was designed specifically for low-input-voltage, high-accuracy power regulation in portable battery-powered equipment - emphasizing minimal dropout, low quiescent current, and integrated system supervision functions.

FAQ

What is the output voltage of the MAX1589EZT130+?

The MAX1589EZT130+ has a factory-trimmed fixed output voltage of 1.3V. This value is set internally and cannot be adjusted externally. The device achieves ±0.5% initial accuracy across temperature and load, ensuring consistent performance for core logic and I/O rails in portable electronics. The "130" suffix in MAX1589EZT130+ explicitly denotes the 1.3V output variant.

Does the MAX1589EZT130+ include a reset output function?

Yes, the MAX1589EZT130+ includes an active-low, open-drain RESET output that remains asserted for at least 70ms after the output voltage reaches regulation. It deasserts when V_OUT rises above 82.5% of nominal (1.0725V) and reasserts immediately if V_OUT drops below that threshold or during shutdown. This integrated function eliminates the need for a separate reset supervisor IC in designs using the MAX1589EZT130+.

What package type does the MAX1589EZT130+ use?

The MAX1589EZT130+ uses a 6-pin thin SOT23-6 package (JEDEC MO-178AA) with maximum height of 1.0mm. It is RoHS-compliant and lead-free ("+" suffix). Unlike the TDFN variants, this version lacks an exposed thermal pad - thermal performance relies on GND pin soldering to a large PCB copper area. The pinout matches standard SOT23-6 orientation with IN, GND, SHDN, RESET, I.C., and OUT assigned to pins 1–6 respectively.

What is the minimum input voltage required for the MAX1589EZT130+ to regulate?

The MAX1589EZT130+ begins regulating at a minimum input voltage of 1.62V. Below this, undervoltage lockout (UVLO) disables regulation. With its 175mV dropout at 500mA, the device maintains 1.3V output down to an input of 1.475V - enabling extended runtime from single-cell Li-ion batteries discharging to ~3.0V per cell. UVLO has 180mV typical hysteresis to prevent oscillation near the threshold.

How does the shutdown feature work on the MAX1589EZT130+?

The MAX1589EZT130+ features an active-low SHDN pin (Pin 3). Pulling SHDN ≤0.6V disables the regulator: OUT disconnects from IN, an internal 1.5kΩ resistor pulls OUT to GND, RESET is actively driven low, and supply current drops below 1µA. During shutdown, the device draws negligible current - ideal for system-level power gating in portable devices. SHDN accepts logic-high up to VIN and operates across the full 1.62V–3.6V input range.