Analog Devices Inc./Maxim Integrated MAX6329TPUT+T

Overview

MAX6329TPUT+T from Maxim Integrated is a 150mA, +3.3V fixed-output low-dropout linear regulator with integrated microprocessor reset circuit, featuring 25µA quiescent current, 180mV dropout at 100mA, and active-low open-drain RESET output. It operates from 2.5V to 5.5V input and delivers stable power with ±3.0% output accuracy for portable battery-powered systems requiring reliable power-up sequencing and brownout protection.

For engineers reviewing the MAX6329TPUT+T datasheet, MAX6329TPUT+T pinout, MAX6329TPUT+T application, or MAX6329TPUT+T equivalent, key selection criteria include its preset +3.3V output, -5% reset threshold, 100ms minimum reset timeout, shutdown capability (SHDN), and SOT23-6 package compatibility with space-constrained embedded designs.

Technical Context

The MAX6329TPUT+T integrates a P-channel MOSFET LDO regulator core with an independent reset supervisor using a shared 1.23V reference. Its regulator operates in fixed +3.3V mode (SET = GND) and supports thermal shutdown, reverse leakage protection, and short-circuit current limiting up to 350mA.

The reset circuit monitors VOUT against a -5% threshold (2.92V min, 3.185V max), asserts active-low open-drain RESET for ≥100ms after recovery, and includes no external RC timing components - eliminating discrete supervisor ICs in µP-based power management.

Key Specifications

Pinout & Package

MAX6329TPUT+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 - requires connection to large copper area or ground plane for optimal 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 TPS76333DBVR and MAX809TRD3+T, the MAX6329TPUT+T uniquely combines 150mA regulation, -5% tracked reset, and 100ms timeout in one SOT23-6 package - reducing total solution size by ≥40% and eliminating inter-component timing skew in portable power domains.

Availability

MAX6329TPUT+T is available at Aetrix Electronics and suitable for hand-held instruments, USB peripheral devices, palm top computers, PCMCIA cards, and cellular telephone subsystems requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for MAX6329TPUT+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, designed specifically for battery-operated portable electronics needing ultra-low IQ, precise reset thresholds, and minimal external components.

FAQ

What is the reset threshold voltage for MAX6329TPUT+T?

The MAX6329TPUT+T features a -5% reset threshold relative to its +3.3V output, resulting in a guaranteed range of 2.92V to 3.185V. This threshold is internally trimmed and tracks the output voltage, ensuring accurate brownout detection without external calibration. The reset remains asserted for ≥100ms after VOUT rises above this threshold, providing robust power-up sequencing for microprocessors in the MAX6329TPUT+T design.

Does MAX6329TPUT+T support adjustable output voltage?

No, the MAX6329TPUT+T is factory-configured for fixed +3.3V output. Its suffix "T" denotes the +3.3V preset version with -5% reset threshold and open-drain RESET output. Adjustable operation requires a different variant (e.g., MAX6329WPUT+T) where the SET pin connects to an external resistor divider. The MAX6329TPUT+T's SET pin must be tied to GND to enable its fixed output mode - floating or incorrect biasing will cause regulation failure.

What is the maximum load current supported by MAX6329TPUT+T?

The MAX6329TPUT+T delivers up to 150mA of continuous output current under specified conditions (VIN ≥ VOUT + dropout, TA ≤ +85°C). Its current limit is set to 350mA typical, allowing safe short-circuit operation without damage. At 150mA load, dropout is 180mV - meaning VIN must be ≥3.48V for stable 3.3V output. Derating applies above +70°C ambient due to thermal limits in the SOT23-6 package.

How does the SHDN pin function on MAX6329TPUT+T?

The SHDN pin on MAX6329TPUT+T is an active-low digital control input that disables the regulator core when pulled low, reducing total supply current to <1µA. When held high (≥0.8×VIN), the device operates normally. It is compatible with standard CMOS logic levels and requires no external pullup. In MAX6329TPUT+T systems, SHDN enables firmware-controlled power gating of downstream peripherals - a key feature distinguishing it from the MAX6349 family which uses MR instead.

What output capacitor value is required for stable operation of MAX6329TPUT+T?

A minimum 1µF ceramic or tantalum capacitor is required at the OUT pin of MAX6329TPUT+T for stable operation across temperature and load. X7R or X5R dielectrics are recommended for full-range stability; Z5U/Y5V types may require ≥2.2µF below -10°C. An additional 1µF capacitor between IN and GND improves PSRR and transient response. Using less than 1µF risks oscillation, especially at light loads or elevated temperatures - a critical constraint verified in the MAX6329TPUT+T's stability characterization.