Analog Devices Inc./Maxim Integrated MAX6470UT33AD3

Overview

MAX6470UT33AD3 from Maxim Integrated is a 300mA low-dropout linear regulator with integrated microprocessor reset circuit, fixed 3.3V output, -12.5% reset threshold, and 150ms minimum reset timeout. It delivers ±2.0% output accuracy over -40°C to +85°C, consumes only 82µA quiescent current, and features active-low push-pull RESET output. It is designed for power management in battery-powered portable electronics requiring reliable supply monitoring and fast startup.

For engineers reviewing the MAX6470UT33AD3 datasheet, MAX6470UT33AD3 pinout, MAX6470UT33AD3 application, or MAX6470UT33AD3 equivalent, key selection criteria include its 3.3V fixed output, 150ms reset timeout, SOT23-6 package, shutdown capability (0.1µA), and dropout voltage of 114mV at 300mA - all critical for compact, low-power embedded systems.

Technical Context

The MAX6470UT33AD3 integrates a precision LDO regulator core with a fully self-contained reset supervisor using the same internal reference. Its reset circuit asserts active-low RESET when VOUT falls below 87.5% of nominal (i.e., 2.8875V for 3.3V output) and holds RESET asserted for ≥150ms after recovery - eliminating need for external supervisors. The device uses a dual-mode SET pin: grounded for fixed 3.3V operation, or configurable via external resistor divider for adjustable outputs.

It implements reverse-current protection (0.01µA OUT→IN leakage), thermal shutdown at +180°C with 20°C hysteresis, and short-circuit current limiting (450mA min). Shutdown is active-low and reduces supply current to 0.1µA typical, enabling ultra-low-power sleep states in handheld instrumentation and wireless modules.

Key Specifications

Pinout & Package

MAX6470UT33AD3 is housed in a 6-pin SOT23-6 package with exposed paddle (internally connected to GND), optimized for thermal dissipation in space-constrained PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS76333DBVR and NCP1117ST33T3G, MAX6470UT33AD3 uniquely combines 300mA drive, 82µA IQ, active-low push-pull RESET with 150ms timeout, and shutdown control in a 6-pin SOT23 - delivering full power-management functionality in minimal footprint for portable electronics.

Availability

MAX6470UT33AD3 is available at Aetrix Electronics and suitable for handheld medical instruments, USB-powered peripherals, Bluetooth LE modules, and notebook subsystem power requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for MAX6470UT33AD3 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 engineered specifically for battery-powered portable equipment needing tightly regulated voltage rails with autonomous power-on reset and ultra-low quiescent current - targeting PDA, cellular, and wireless module markets.

FAQ

What is the exact reset threshold voltage for MAX6470UT33AD3?

The MAX6470UT33AD3 has a -12.5% reset threshold, meaning RESET asserts when VOUT falls below 87.5% of its nominal 3.3V output - i.e., 2.8875V. This threshold is factory-trimmed and guaranteed over temperature. The device maintains RESET low for ≥150ms after VOUT recovers above this level, ensuring reliable microprocessor initialization.

Does MAX6470UT33AD3 support adjustable output voltage?

No, MAX6470UT33AD3 is configured for fixed 3.3V output. Its SET pin must be connected to GND to activate the internal feedback network. While the broader MAX6469–MAX6484 family supports adjustable outputs via external resistors on the SET pin, the MAX6470UT33AD3 variant is factory-set and not intended for adjustable operation - altering the SET connection may result in undefined output voltage or instability.

What package type and pin count does MAX6470UT33AD3 use?

MAX6470UT33AD3 uses a 6-pin SOT23-6 package with exposed thermal pad (EP), where EP is internally connected to GND. Pinout is standardized across the MAX6469–MAX6476 series: IN, GND, SHDN, RESET, SET, OUT. This compact footprint supports high-density layouts in portable electronics while enabling effective thermal conduction through the exposed pad.

How does the shutdown feature operate on MAX6470UT33AD3?

MAX6470UT33AD3 features an active-low SHDN pin (Pin 3). When pulled low, it disables the regulator pass transistor, reference, and control circuitry - reducing total supply current to 0.1µA typical. During shutdown, RESET remains asserted low. Normal operation resumes within 20µs of SHDN returning high, provided VIN is valid and VOUT can stabilize. This enables rapid, low-power state transitions in battery-operated systems.

Is MAX6470UT33AD3 compatible with ceramic output capacitors?

Yes, MAX6470UT33AD3 is explicitly designed for use with ceramic output capacitors. A minimum 3.3µF X5R/X7R ceramic capacitor with ESR < 0.2Ω is required for stability across temperature and load (1mA–300mA). The device's internal compensation eliminates need for series resistance or tantalum alternatives - simplifying design and improving transient response in noise-sensitive applications like audio or RF subsystems.