Analog Devices Inc./Maxim Integrated MAX6329YPUT+T

Overview

MAX6329YPUT+T from Maxim Integrated is a 150mA, low-dropout linear voltage regulator with integrated microprocessor reset circuit, preset for +1.8V output and -10% reset threshold (Y variant), housed in SOT23-6 package. It delivers 25µA quiescent current, 180mV dropout at 100mA, and 100ms minimum reset timeout-designed for power-sensitive portable systems requiring reliable supply monitoring and brownout protection.

For engineers reviewing the MAX6329YPUT+T datasheet, MAX6329YPUT+T pinout, MAX6329YPUT+T application, or MAX6329YPUT+T equivalent, key selection criteria include its fixed +1.8V output, open-drain active-low RESET, SHDN control, thermal/short-circuit protection, and compatibility with 1µF ceramic output capacitors in space-constrained battery-powered designs.

Technical Context

The MAX6329YPUT+T 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 and maintains ±3.0% output accuracy over temperature and load. The reset circuit monitors VOUT against a -10% threshold (2.08V to 2.28V for +1.8V output) and asserts open-drain RESET for ≥100ms after recovery.

It features shutdown control (SHDN pin) reducing supply current to <1µA, reverse leakage protection eliminating external blocking diodes, and stable operation with ≥1µF ceramic output capacitance. Thermal shutdown activates at +160°C with 20°C hysteresis, and current limiting caps output at 350mA typical.

Key Specifications

Pinout & Package

MAX6329YPUT+T is packaged in a 6-pin SOT23-6 surface-mount package with exposed pad for thermal dissipation. GND serves dual role as electrical reference and heatsink-requires connection to large PCB copper area for optimal thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6329YPUT+T, MAX6328YPUT+T offers earlier reset assertion and different output polarity, while TPS76318QDBVRQ1 trades integrated supervision for automotive qualification-neither is pin-compatible, and both require layout changes due to differing pin functions and package footprints.

Availability

MAX6329YPUT+T is available at Aetrix Electronics and suitable for hand-held instruments, USB peripheral devices, palm top computers, and PCMCIA cards requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for MAX6329YPUT+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 MAX6329 series belongs to Maxim's micropower supervisory regulator product line, engineered specifically for battery-operated portable equipment demanding ultra-low quiescent current, precise reset thresholds, and minimal external components.

FAQ

What output voltage does the MAX6329YPUT+T deliver, and how is it set?

The MAX6329YPUT+T delivers a fixed +1.8V output with ±3.0% accuracy over temperature and load. This is achieved by connecting the SET pin directly to GND, which selects the internal feedback resistors calibrated for the Y variant. No external components are required for fixed-voltage operation, simplifying design and reducing bill-of-materials cost. The MAX6329YPUT+T does not support adjustable output unless the SET pin is reconfigured with an external resistor divider-however, that would deviate from its factory-trimmed +1.8V specification.

How does the reset function work on the MAX6329YPUT+T, and what is its timeout duration?

The MAX6329YPUT+T integrates a precision reset supervisor that monitors the +1.8V output and asserts the open-drain active-low RESET pin when VOUT falls below the -10% threshold (2.08V–2.28V). After VOUT recovers above threshold, RESET remains asserted for a guaranteed minimum of 100ms to ensure system stability. This timeout is internally generated and does not require external timing components, making the MAX6329YPUT+T a self-contained reset solution for microprocessor-based systems.

Can the MAX6329YPUT+T be used with ceramic output capacitors, and what is the minimum value?

Yes, the MAX6329YPUT+T is fully stable with ceramic output capacitors as small as 1µF-no ESR requirements or damping networks needed. This is validated across the full operating temperature range (-40°C to +85°C) using X7R or X5R dielectrics. Using 1µF ceramic reduces solution size and cost compared to traditional tantalum capacitors, and improves reliability by eliminating polymer degradation mechanisms. Larger values (e.g., 10µF) further enhance load transient response and PSRR.

What protection features are built into the MAX6329YPUT+T?

The MAX6329YPUT+T includes thermal shutdown (activates at +160°C with 20°C hysteresis), output short-circuit protection (limits current to 350mA typical), and reverse leakage protection (blocks current flow from OUT to IN when VOUT > VIN). These features operate autonomously without external components, enabling robust operation in unattended or harsh environments such as modems, cellular handsets, and industrial data loggers-where the MAX6329YPUT+T maintains safe operation even under fault conditions.

Is the MAX6329YPUT+T pin-compatible with other variants in the MAX6329 family?

No, the MAX6329YPUT+T is not universally pin-compatible across all MAX6329 variants due to functional differences in the RESET pin configuration. While all MAX6329 parts use the SOT23-6 package and share identical pin numbering, the RESET pin may be open-drain (P suffix), push-pull active-low (L suffix), or push-pull active-high (H suffix). The MAX6329YPUT+T has open-drain RESET (P suffix), so substituting a TL or TH variant would require circuit-level changes-including pullup/pulldown resistors and µP reset input polarity validation-making direct replacement unsafe without schematic review.