Analog Devices Inc./Maxim Integrated MAX6469UT28AD1

Overview

MAX6469UT28AD1 from Maxim Integrated is a 300mA low-dropout linear regulator with integrated microprocessor reset circuit, delivering a fixed +2.8V output (±2.7% over temperature), 55mV dropout at 150mA, and 82µA quiescent current. It features active-low push-pull RESET with 2.5ms timeout, shutdown capability reducing supply current to 0.1µA, and operates across -40°C to +85°C - ideal for battery-powered portable electronics requiring reliable power sequencing and brownout protection.

For engineers reviewing the MAX6469UT28AD1 datasheet, MAX6469UT28AD1 pinout, MAX6469UT28AD1 application, or MAX6469UT28AD1 equivalent, key selection criteria include its fixed 2.8V output, SOT23-6 package, integrated reset with 2.5ms delay, shutdown control, and guaranteed 300mA load capability under low-input-voltage conditions.

Technical Context

The MAX6469UT28AD1 integrates a precision LDO regulator core with a dedicated reset supervisor sharing the same voltage reference. Its SET pin is internally connected to GND to enable fixed 2.8V output mode, eliminating external feedback components. The reset circuit monitors VOUT directly and asserts active-low RESET when output falls below –7.5% of nominal (i.e., <2.61V) for ≥2.5ms minimum duration.

It employs an internal P-channel pass transistor enabling ultra-low dropout (55mV @150mA), reverse current protection (0.01µA OUT→IN leakage), and thermal shutdown at +180°C with 20°C hysteresis. Shutdown is controlled via active-low SHDN, which disables regulation and reduces total supply current to ≤1µA.

Key Specifications

Pinout & Package

MAX6469UT28AD1 is housed in a 6-pin SOT23-6 package with exposed paddle (internally connected to GND). Thermal performance is optimized by soldering the EP pad to a large PCB ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6469UT28AD1, TPS76328DBVR offers lower cost and smaller size but omits reset integration, increasing design complexity; ADM6315-28D3ARTZ-RL delivers precise reset supervision but adds component count and layout area versus the all-in-one solution.

Availability

MAX6469UT28AD1 is available at Aetrix Electronics and suitable for handheld instruments, PCMCIA/USB devices, and cellular telephones requiring stable component supply with guaranteed long-term manufacturability.

Supply support for MAX6469UT28AD1 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 MAX6469–MAX6484 product line was designed specifically for space-constrained, battery-powered systems needing tightly coupled regulation and reset functionality in minimal footprint - targeting portable instrumentation, wireless modules, and embedded edge devices.

FAQ

What output voltage does the MAX6469UT28AD1 deliver?

The MAX6469UT28AD1 delivers a fixed +2.8V output with ±2.7% accuracy over the full –40°C to +85°C operating temperature range. This value is factory-trimmed and requires no external resistors, as the SET pin is internally grounded to select the preset voltage defined by the "28" suffix in the part number.

Does the MAX6469UT28AD1 include a reset function, and what is its timeout period?

Yes, the MAX6469UT28AD1 includes an integrated active-low reset circuit with a 2.5ms minimum timeout period, indicated by the "D1" suffix. RESET asserts when VOUT drops below –7.5% of nominal (2.61V) and remains asserted for ≥2.5ms after VOUT recovers, ensuring reliable microprocessor initialization.

What package type is used for the MAX6469UT28AD1?

The MAX6469UT28AD1 uses a 6-pin SOT23-6 package with exposed thermal pad (EP), designated by the "UT" prefix in the ordering code. This compact surface-mount package supports high-density PCB layouts and requires connection of the EP to the ground plane for optimal thermal performance.

Can the MAX6469UT28AD1 be shut down to reduce power consumption?

Yes, the MAX6469UT28AD1 features an active-low SHDN pin (Pin 3) that reduces total supply current to 0.1µA typical when pulled low. In shutdown mode, the pass transistor, reference, and control circuitry are disabled - making it suitable for ultra-low-power applications such as battery-backed real-time clocks or sensor wake-on-event systems.

What protection features does the MAX6469UT28AD1 provide?

The MAX6469UT28AD1 includes input undervoltage lockout (2.25V min), thermal shutdown at +180°C with 20°C hysteresis, short-circuit current limiting (450mA min), and reverse current protection (0.01µA OUT→IN leakage). These features collectively safeguard both the IC and the host system during abnormal operating conditions.