Analog Devices Inc./Maxim Integrated MAX6329VLUT+

Overview

MAX6329VLUT+ from Maxim Integrated is a 150mA low-dropout linear voltage regulator with integrated microprocessor reset circuit, preset +1.8V output, -10% reset threshold (VTH = 1.50V to 1.65V), 25µA quiescent current, and 180mV dropout at 100mA - designed for battery-powered handheld instruments and USB devices requiring stable low-power supply and reliable power-on reset.

For engineers reviewing the MAX6329VLUT+ datasheet, MAX6329VLUT+ pinout, MAX6329VLUT+ application, or MAX6329VLUT+ equivalent, this page delivers verified technical context, exact SOT23-6 pin mapping, confirmed reset timeout (100ms min), thermal shutdown behavior (+160°C trip), and real-world design meaning of adjustable SET feedback and reverse leakage protection.

Technical Context

The MAX6329VLUT+ integrates a P-channel MOSFET LDO regulator core and a precision reset supervisor sharing the same 1.23V reference. Its regulator operates from 2.5V to 5.5V input, delivers up to 150mA, and maintains ±3.0% output accuracy over temperature and load. The reset circuit monitors VOUT against a fixed -10% threshold (1.50V–1.65V for +1.8V output) and asserts open-drain active-low RESET for ≥100ms after recovery.

It features active-low SHDN control (reducing supply current to ≤1µA), zero reverse leakage current (no external blocking diode needed), and built-in protections: thermal shutdown (+160°C with 20°C hysteresis), short-circuit current limiting (350mA typ), and output capacitor stability with ≥1µF ceramic.

Key Specifications

Pinout & Package

Package: 6-pin SOT23-6 (JEDEC MO-178AA), 2.9mm × 1.6mm × 1.1mm body, GND pin serves as thermal pad - requires soldering to PCB ground plane for full thermal performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-dropout regulator with integrated reset applications.

Compared with MAX6328VLUT+, the MAX6329VLUT+ provides later reset assertion (better noise immunity) and active shutdown control; compared with TPS76318QDBVRQ1+TPS3808G18, it integrates both functions in one SOT23-6 chip, reducing footprint by >40% and eliminating timing skew between regulation and reset.

Availability

MAX6329VLUT+ is available at Aetrix Electronics and suitable for hand-held instruments, USB peripheral devices, and palm top computers requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for MAX6329VLUT+ 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 MAX6329 series belongs to Maxim's micropower supervisory regulator product line, engineered specifically for battery-operated portable equipment needing simultaneous voltage regulation and precise, low-current reset supervision.

FAQ

What is the exact reset threshold voltage for MAX6329VLUT+?

The MAX6329VLUT+ has a fixed -10% reset threshold relative to its +1.8V output, specified as 1.50V (min) to 1.65V (max) over temperature and supply. This value is factory-trimmed and guaranteed - not dependent on external components. The threshold tracks VOUT, so any deviation in output voltage proportionally shifts the reset point. This ensures robust brownout detection even as battery voltage declines.

Does MAX6329VLUT+ require an external pullup resistor on the RESET pin?

Yes, MAX6329VLUT+ uses an open-drain active-low RESET output, which requires an external pullup resistor to VOUT or another valid logic rail. Typical values range from 10kΩ to 100kΩ. Without the pullup, RESET remains floating and cannot drive a valid logic high level to the microprocessor's reset input. The internal circuitry does not provide pullup - this is a mandatory external component for functional reset signaling.

Can MAX6329VLUT+ be used with an adjustable output voltage?

No - MAX6329VLUT+ is factory-configured for fixed +1.8V output and -10% reset threshold. Its SET pin is internally connected to enable the preset mode; using an external resistor divider would not yield a stable or accurate adjustable output. For adjustable operation, select a different variant such as MAX6329VHUT+ (same voltage, push-pull RESET) or MAX6329Wxxx variants with "W" suffix indicating adjustable mode.

What is the maximum continuous output current for MAX6329VLUT+?

The MAX6329VLUT+ delivers up to 150mA DC output current under normal operating conditions (VIN ≥ VOUT + dropout). It includes internal current limiting that clamps output at ~350mA (typical) during overload or short-circuit events. Sustained 150mA operation requires proper PCB thermal design - the GND pin must be soldered to a ≥100mm² copper pour to maintain junction temperature below +150°C at +85°C ambient.

How does the SHDN pin behave when left unconnected on MAX6329VLUT+?

When SHDN is left unconnected on MAX6329VLUT+, it defaults to high due to internal biasing, enabling normal regulator operation. However, this state is not electrically robust against ESD or noise coupling. Maxim recommends explicitly tying SHDN to IN (for always-on use) or to a controlled GPIO. Floating SHDN may cause intermittent shutdown in noisy environments, leading to unpredictable system resets - always terminate SHDN with a defined logic level in production designs.