Analog Devices Inc./Maxim Integrated MAX6329WPUT+

Overview

MAX6329WPUT+ 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 (W suffix), in push-pull active-high RESET configuration (L suffix), housed in SOT23-6 package. It delivers ±3.0% output accuracy, consumes only 25µA quiescent current, and maintains 180mV dropout at 100mA load - optimized for battery-powered handheld instruments and USB devices.

For engineers reviewing the MAX6329WPUT+ datasheet, MAX6329WPUT+ pinout, MAX6329WPUT+ application, or MAX6329WPUT+ equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative options, and supply-chain support details specific to this exact variant.

Technical Context

The MAX6329WPUT+ integrates a P-channel MOSFET LDO regulator core with an independent reset supervisor sharing the same 1.23V reference. Its fixed +1.8V output is set by internal feedback resistors when SET is grounded, and its -10% reset threshold (1.62V min) triggers RESET assertion during brownout and ensures 100ms minimum timeout after recovery.

It features active-low SHDN input (logic-compatible, <1µA shutdown current), reverse leakage protection (zero IN-to-OUT leakage), thermal shutdown at +160°C with 20°C hysteresis, and short-circuit current limiting at 350mA - all implemented in BiCMOS process with 800-transistor die.

Key Specifications

Pinout & Package

Package: SOT23-6 - surface-mount, thermally enhanced 6-pin plastic package with GND pin acting as heatsink; requires soldering to PCB ground plane for optimal thermal dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6329TPUT+, MAX6329WPUT+ provides lower output voltage suited for modern low-power SoCs but trades reset threshold precision for wider brownout margin; compared with TPS76318QDBVRQ1, it integrates reset functionality at the cost of automotive qualification - simplifying design for industrial handhelds but limiting automotive use.

Availability

MAX6329WPUT+ is available at Aetrix Electronics and suitable for hand-held instruments, USB-powered peripherals, palm-top computers, and PCMCIA cards requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.

Supply support for MAX6329WPUT+ 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 - known for high-reliability, low-power solutions in portable and industrial systems.

The MAX6329 series targets battery-operated equipment needing combined regulation and supervision in minimal footprint - specifically engineered to replace discrete LDO + supervisor combinations in space-constrained, ultra-low-power designs.

FAQ

What output voltage does MAX6329WPUT+ deliver, and how is it set?

MAX6329WPUT+ delivers a fixed +1.8V output with ±3.0% accuracy across temperature and load. This is achieved by internal feedback resistors; the SET pin must be connected to GND to enable fixed-mode operation. The W suffix explicitly denotes the +1.8V/-10% variant, and no external resistors are required for this configuration. MAX6329WPUT+ does not support adjustable output - that capability requires different variants like MAX6329WUT+ with SET configured as divider input.

How does the reset function behave on MAX6329WPUT+ during power-up?

During power-up, MAX6329WPUT+ asserts its active-high RESET output low until the OUT voltage rises above the -10% threshold (≥1.62V) and remains stable for at least 100ms. This ensures clocks and power domains settle before releasing the microprocessor. The RESET pin is push-pull, so it actively drives high after timeout without needing an external pull-up. MAX6329WPUT+ uses the same internal 1.23V reference for both regulation and reset detection, guaranteeing tracking accuracy.

Can MAX6329WPUT+ be used with a 1µF ceramic output capacitor?

Yes - MAX6329WPUT+ is fully stable with a 1µF X7R or X5R ceramic capacitor on the OUT pin, as specified in the datasheet and validated across -40°C to +85°C. This value satisfies minimum stability requirements for loads up to 150mA. Larger capacitors (e.g., 10µF) further improve transient response and PSRR, but 1µF enables minimal BOM count and board area. Z5U/Y5V dielectrics are not recommended due to ESR drift at temperature extremes.

What is the purpose of the SHDN pin on MAX6329WPUT+, and what logic levels does it accept?

The SHDN pin on MAX6329WPUT+ is an active-low digital control that reduces total supply current to <1µA when asserted, enabling ultra-low-power sleep modes. It accepts standard logic levels: VIH ≥ 0.8×VIN and VIL ≤ 0.3×VIN, making it compatible with 1.8V, 3.3V, or 5V GPIOs. When unconnected, internal bias pulls SHDN high for normal operation. MAX6329WPUT+ does not include MR (manual reset) - that feature belongs to MAX6349 variants only.

Does MAX6329WPUT+ provide reverse current protection, and how does it work?

Yes - MAX6329WPUT+ includes integrated reverse leakage protection that blocks current flow from OUT to IN when VOUT > VIN (e.g., during backup battery operation). An internal monitoring circuit disables the pass transistor and parasitic paths, achieving zero reverse leakage current. This eliminates the need for external Schottky diodes in dual-supply systems, reducing voltage drop, power loss, and component count. The protection operates automatically without user configuration.