Analog Devices Inc./Maxim Integrated MAX6329ZHUT+T

Overview

MAX6329ZHUT+T from Maxim Integrated is a 150mA, low-dropout linear voltage regulator with integrated microprocessor reset circuit, preset +1.8V output, -10% reset threshold, open-drain active-low RESET output, and shutdown control. It consumes only 25µA quiescent current, achieves 180mV dropout at 100mA, and operates from 2.5V to 5.5V input-ideal for battery-powered USB devices and handheld instruments.

For engineers reviewing the MAX6329ZHUT+T datasheet, MAX6329ZHUT+T pinout, MAX6329ZHUT+T application, or MAX6329ZHUT+T equivalent, key selection criteria include its fixed +1.8V output, -10% reset tolerance, SHDN-controlled ultra-low shutdown current (<1µA), SOT23-6 package footprint, and compatibility with 1µF ceramic output capacitors.

Technical Context

The MAX6329ZHUT+T integrates a P-channel MOSFET LDO regulator core and a precision reset supervisor sharing the same 1.23V reference. Its regulator uses internal feedback for fixed +1.8V output (Z-suffix), while the reset circuit asserts when VOUT falls below 90% of nominal (1.62V min) and holds for ≥100ms after recovery.

It features reverse leakage protection (zero IN-to-OUT current when VOUT > VIN), thermal shutdown at +160°C with 20°C hysteresis, and current limiting at 350mA. The SHDN pin enables full system power gating, reducing total supply current to <1µA in shutdown mode.

Key Specifications

Pinout & Package

MAX6329ZHUT+T is housed in a 6-pin SOT23-6 package with exposed pad for thermal dissipation. GND pin serves as both electrical reference and heatsink; recommended soldering to PCB ground plane.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO-with-reset applications.

Compared with MAX6328ZHUT+T, the MAX6329ZHUT+T provides earlier reset assertion during brownout, improving robustness in weak-battery scenarios; versus TPS76318QDBVRQ1, it offers lower quiescent current and SHDN control but lacks automotive qualification.

Availability

MAX6329ZHUT+T is available at Aetrix Electronics and suitable for USB devices, handheld instruments, palm-top computers, and PCMCIA cards requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production lots.

Supply support for MAX6329ZHUT+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) designs precision analog and mixed-signal ICs for power management, sensing, and interface applications.

The MAX6329 series targets battery-constrained portable electronics, integrating regulation and supervision in minimal footprint to reduce system-level complexity and power overhead.

FAQ

What output voltage does the MAX6329ZHUT+T deliver?

The MAX6329ZHUT+T delivers a fixed +1.8V output with ±3.0% accuracy over 0°C to +85°C. This is confirmed by its Z-suffix designation in the Selector Guide and electrical characteristics table, where VOUT = 1.745V to 1.855V at 100mA load. The SET pin is internally configured for fixed operation, eliminating need for external resistors.

Does the MAX6329ZHUT+T include a shutdown function?

Yes, the MAX6329ZHUT+T includes an active-low SHDN pin (Pin 3) that reduces total supply current to less than 1µA when asserted. This feature is exclusive to the MAX6329 family (not MAX6349), and is verified in the Pin Description, Electrical Characteristics (shutdown supply current = 1µA max), and Functional Diagram showing SHDN controlling the pass transistor gate driver.

What is the reset behavior of the MAX6329ZHUT+T?

The MAX6329ZHUT+T asserts its open-drain active-low RESET output when VOUT drops below 90% of nominal (1.62V min), and holds reset for ≥100ms after VOUT recovers above threshold. This -10% reset tolerance is confirmed by the Z-suffix in the Selector Guide and Electrical Characteristics table listing VTH = 1.50V to 1.65V for MAX63_9Z versions.

What package type is used for the MAX6329ZHUT+T?

The MAX6329ZHUT+T uses a 6-pin SOT23-6 package with exposed pad, as specified in the Ordering Information table and Package Outline drawing (6LSOT.EPS). The top mark "AAIZ" corresponds uniquely to MAX6329ZHUT+T per the Selector Guide, confirming mechanical and thermal compatibility with standard SOT23-6 footprints.

Can the MAX6329ZHUT+T operate with a 1µF output capacitor?

Yes, the MAX6329ZHUT+T is fully stable with a 1µF ceramic output capacitor, as explicitly stated in the Features list, Applications Information section, and Typical Operating Characteristics. This value meets minimum stability requirements across 0°C to +85°C and up to 150mA load, eliminating need for larger or higher-ESR alternatives.