Analog Devices Inc./Maxim Integrated MAX6380XR46

Overview

MAX6380XR46 from Maxim Integrated is an ultra-low-power, open-drain, active-low voltage detector designed for precision power-supply monitoring in battery-powered systems. It features a factory-trimmed 4.63V threshold (±2.5% over temperature), 500nA supply current, and operates down to 1V VCC. It asserts OUT low when VCC falls below threshold and is used in Li+-battery backup supervision and microcontroller reset circuits.

For engineers reviewing the MAX6380XR46 datasheet, MAX6380XR46 pinout, MAX6380XR46 application, or MAX6380XR46 equivalent, key selection criteria include its 4.63V trip point, SC70-3 open-drain output configuration, transient immunity up to 100µs at 10mV overdrive, and guaranteed logic state down to 1V supply - critical for low-voltage brownout detection in portable electronics.

Technical Context

The MAX6380XR46 implements a precision bandgap reference and comparator with internally trimmed resistors to set its 4.63V threshold. Its open-drain output requires an external pullup and sinks ≥100µA when asserted, supporting interface with diverse logic families up to 5.5V.

It ignores fast negative-going VCC transients: at 10mV overdrive (VTH − VCC = 10mV), it tolerates transients ≤140µs without false triggering; at 100mV overdrive, maximum duration drops to ~20µs. Propagation delay is 9.5µs (rising) and 6.3µs (falling) across −40°C to +85°C.

Key Specifications

Pinout & Package

MAX6380XR46 is housed in a 3-pin SC70-3 package (2.0mm × 2.1mm × 0.95mm), optimized for space-constrained portable designs. The package is lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage detector applications.

Compared with TLV803EB33DBZR and TPS3808G33DBVR, the MAX6380XR46 uniquely combines 4.63V threshold, open-drain output, and 500nA current in SC70-3 - making it the only drop-in solution for 5V brownout detection where reset bus sharing or level translation is needed.

Availability

MAX6380XR46 is available at Aetrix Electronics and suitable for battery backup supervision, microcontroller reset generation, and DC/DC enable control requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.

Supply support for MAX6380XR46 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 MAX6375–MAX6380 family was designed specifically for ultra-low-power voltage monitoring in portable and battery-critical systems - delivering precision thresholds, nanoscale supply current, and robust transient immunity in minimal footprints.

FAQ

What is the exact reset threshold voltage of the MAX6380XR46?

The MAX6380XR46 has a factory-trimmed nominal reset threshold of 4.63V, with guaranteed accuracy of ±2.5% over the full operating temperature range of −40°C to +85°C. This value is confirmed in Table 1 of the datasheet under suffix "R46", and applies specifically to the MAX6380XR46 variant - not to other members of the MAX6375–MAX6380 family.

Does the MAX6380XR46 support operation below 1.2V VCC?

Yes, the MAX6380XR46 is guaranteed to maintain correct output logic state (active-low when VCC < 4.63V) down to 1V VCC, per the Electrical Characteristics table. While the recommended minimum operating voltage is 1.2V, functional behavior is specified to 1V - enabling reliable detection during deep brownout conditions where other supervisors may fail.

What package type and dimensions does the MAX6380XR46 use?

The MAX6380XR46 is supplied exclusively in the SC70-3 package: 2.0mm × 2.1mm × 0.95mm body size with 0.65mm lead pitch. Pin 1 is GND, Pin 2 is open-drain OUT, and Pin 3 is VCC. This matches the top-view diagram in the datasheet and is distinct from the SOT23-3 variant (MAX6380UR46-T).

Can the MAX6380XR46 drive a standard CMOS input directly?

No - the MAX6380XR46 features an open-drain output and cannot drive a CMOS input high without an external pullup resistor. A typical 10kΩ pullup to the target logic rail (e.g., 3.3V or 5V) is required. When asserted, OUT sinks ≥100µA at VCC ≥1.2V, ensuring valid logic-low levels across voltage domains.

How does the MAX6380XR46 handle power-supply transients?

The MAX6380XR46 rejects short negative-going VCC transients using built-in hysteresis and propagation delay filtering. As shown in Figure MAX6375-04, it tolerates transients up to 140µs at 10mV overdrive (VTH − VCC = 10mV) and down to ~20µs at 100mV overdrive - preventing false resets during switching noise or load-dump events.