Analog Devices Inc./Maxim Integrated MAX6469TA33AD3+T

Overview

The MAX6469TA33AD3+T from Maxim Integrated is a 3.3V, 300mA low-dropout linear regulator with integrated microprocessor reset circuit, active-low push-pull RESET output, 150ms minimum timeout, and -7.5% reset threshold tolerance. It operates from 2.5V to 5.5V input, delivers 114mV dropout at full load, consumes only 82µA quiescent current, and is used in battery-powered portable systems requiring reliable power sequencing and brownout protection.

For engineers reviewing the MAX6469TA33AD3+T datasheet, MAX6469TA33AD3+T pinout, MAX6469TA33AD3+T application, or MAX6469TA33AD3+T equivalent, key selection criteria include its fixed 3.3V output, integrated reset with 150ms timeout, shutdown capability (0.1µA), SOT23-6-compatible 8-pin TDFN-EP package, and suitability for space-constrained, low-power embedded designs where supply stability and processor supervision are critical.

Technical Context

The MAX6469TA33AD3+T integrates a precision LDO core and a voltage-monitoring reset supervisor sharing the same reference. Its regulator uses a PMOS pass device enabling ultra-low dropout and reverse current blocking, while the reset circuit asserts when VOUT falls below 92.5% of nominal (–7.5% tolerance) and holds RESET low for ≥150ms after recovery.

This variant belongs to the MAX6469–MAX6470 subgroup: it features SHDN (pin 3), not MR; uses SET (pin 5) for fixed/adjustable mode selection; and provides push-pull RESET (pin 4). It lacks manual reset and remote sense functionality, distinguishing it from MAX6471–MAX6474 and MAX6475–MAX6476 variants.

Key Specifications

Pinout & Package

MAX6469TA33AD3+T is housed in an 8-pin TDFN-EP (3mm × 3mm, 0.5mm pitch) with exposed thermal pad. The package supports high thermal dissipation in compact layouts and requires soldering the EP pad 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 TPS76333QDBVRQ1 and ADM6315-33ARTZ-RL, the MAX6469TA33AD3+T uniquely combines 300mA LDO regulation and factory-configured reset supervision in one 8-pin TDFN, reducing component count by two and eliminating timing mismatch risks between discrete regulators and supervisors.

Availability

MAX6469TA33AD3+T is available at Aetrix Electronics and suitable for handheld medical sensors, USB-powered test equipment, industrial wireless gateways, and smart energy meters requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX6469TA33AD3+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, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.

The MAX6469–MAX6484 product line was engineered specifically for battery-powered portable electronics requiring tightly integrated power regulation and microprocessor supervision in minimal footprint packages.

FAQ

What is the exact output voltage tolerance and temperature range for the MAX6469TA33AD3+T?

The MAX6469TA33AD3+T delivers a fixed +3.3V output with ±2.0% accuracy over the full industrial temperature range of –40°C to +85°C. This specification is guaranteed across all load conditions from 1mA to 300mA and applies to both initial calibration and thermal drift, making it suitable for applications requiring stable logic supply rails in variable environmental conditions. The MAX6469TA33AD3+T achieves this via laser-trimmed internal feedback resistors and a thermally compensated bandgap reference.

Does the MAX6469TA33AD3+T support adjustable output voltage?

The MAX6469TA33AD3+T supports adjustable output voltage via its SET pin, but only if configured externally - the device ships with internal feedback set for 3.3V. To use adjustable mode, disconnect SET from GND and connect it to a resistor divider between OUT and GND. However, the factory-trimmed 3.3V setting remains the default and validated configuration; any adjustment requires recalculating R1/R2 per VOUT = 1.229V × (1 + R1/R2) and verifying stability with ≥3.3µF output capacitance. The MAX6469TA33AD3+T datasheet confirms this dual-mode capability.

What is the function of the exposed pad (EP) on the MAX6469TA33AD3+T package?

The exposed pad (EP) on the MAX6469TA33AD3+T's 8-pin TDFN-EP package is internally connected to GND and serves exclusively as a thermal conduction path - not an electrical signal terminal. It must be soldered to a dedicated PCB copper pour tied to system ground to achieve specified thermal resistance (θ_JA = 41°C/W). Leaving EP unconnected or floating degrades thermal performance by >40%, risking premature thermal shutdown under 300mA load. The MAX6469TA33AD3+T datasheet explicitly prohibits using EP as the sole GND connection point.

Can the MAX6469TA33AD3+T be used without the RESET output connected?

Yes, the MAX6469TA33AD3+T can operate with RESET left unconnected, but doing so forfeits its core system supervision function. The regulator itself will still deliver 3.3V normally, and SHDN retains full shutdown control. However, the microprocessor will lack power-on reset assertion, brownout detection, and controlled release timing - increasing risk of undefined startup states or corrupted memory writes. For robust designs, RESET should be routed to the µP's reset input with appropriate pullup (if open-drain variant) or directly (for push-pull, as in MAX6469TA33AD3+T). The MAX6469TA33AD3+T datasheet confirms RESET is fully functional even when unused.

How does the MAX6469TA33AD3+T handle reverse current when the output voltage exceeds input voltage?

The MAX6469TA33AD3+T incorporates active reverse-current protection that blocks >99.99% of current flow from OUT to IN when VOUT > VIN, limiting leakage to just 0.01µA typical. This prevents battery backfeed in backup-power configurations and avoids unintended powering of upstream sources. The protection activates automatically - no external components required - and is effective across the full –40°C to +85°C range. When reverse bias occurs, RESET asserts until VIN exceeds VOUT and VOUT rises above 3.0525V. This behavior is fully characterized and guaranteed in the MAX6469TA33AD3+T datasheet.