Analog Devices Inc./Maxim Integrated MAX6363LUT46

Overview

MAX6363LUT46 from Maxim Integrated is a low-power microprocessor supervisory circuit with battery switchover functionality, designed for power-fail detection and SRAM backup in embedded systems. It features a factory-preset 4.63V reset threshold (min), active-low push-pull RESET output, battery-on indicator (BATT ON), and operates from +1.2V supply (VCC or VBATT). It supports brownout protection and automatic VCC-to-battery switchover when VCC falls below VBATT by ≥20mV.

For engineers reviewing the MAX6363LUT46 datasheet, MAX6363LUT46 pinout, MAX6363LUT46 application, or MAX6363LUT46 equivalent, this device is selected for precision 4.63V supply monitoring, battery-backed memory retention, and industrial-grade reset timing with guaranteed 150ms timeout and 1.2V operation down to GND.

Technical Context

The MAX6363LUT46 integrates a precision voltage comparator with ±1.5% threshold accuracy over temperature, internal hysteresis (40mV) for stable switchover between VCC and VBATT, and a dedicated BATT ON open-drain output that asserts high during battery-backup mode. Its internal MOSFET switch connects VBATT to OUT only when VCC < VTH and VCC < (VBATT − 0.02V), preventing oscillation during slow VCC decay.

It delivers guaranteed reset assertion during power-up, brownout, and power-down events, with RESET valid down to 1.2V supply and propagation delay under 5µs (VCC falling at 10V/ms). The device draws only 15µA typical supply current at +25°C and maintains <0.02µA battery standby current in backup mode.

Key Specifications

Pinout & Package

MAX6363LUT46 is housed in a RoHS-compliant 6-pin SOT23-6 package (2.9mm × 1.6mm × 1.1mm), optimized for space-constrained PCB layouts in portable and industrial equipment.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6363HUT46 and TPS3808G33DBVR, the MAX6363LUT46 uniquely combines 4.63V precision threshold, active-low push-pull RESET, and integrated BATT ON signaling-enabling full battery-backup capability without additional discrete components.

Availability

MAX6363LUT46 is available at Aetrix Electronics and suitable for industrial control, medical instrumentation, and smart metering applications requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance across –40°C to +85°C.

Supply support for MAX6363LUT46 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 MAX6363LUT46 belongs to the MAX636x family of micropower supervisory circuits, engineered specifically for reliable power monitoring and battery-backed memory retention in space- and energy-constrained embedded systems.

FAQ

What is the exact reset threshold voltage of MAX6363LUT46?

The MAX6363LUT46 has a factory-trimmed reset threshold of 4.50V (minimum), 4.63V (typical), and 4.75V (maximum) over –40°C to +85°C. This 4.63V nominal value is laser-trimmed during production and specified with ±1.5% accuracy, making it suitable for monitoring +5V rails where early brownout detection is critical. The MAX6363LUT46 uses an internal bandgap reference to maintain stability across temperature and supply variations.

Does MAX6363LUT46 support battery switchover, and how does it work?

Yes, the MAX6363LUT46 supports automatic battery switchover: when VCC falls below the reset threshold and also drops at least 20mV below VBATT, the internal MOSFET connects the backup battery to the OUT pin. This ensures uninterrupted power to SRAM or real-time clocks. The MAX6363LUT46 also asserts the BATT ON output high during this mode, enabling firmware to detect and respond to backup activation. Switchover hysteresis prevents chatter during slow VCC decay.

What is the function of the BATT ON pin on MAX6363LUT46?

The BATT ON pin on MAX6363LUT46 is an open-drain output that goes high (pulled up externally) exclusively during battery-backup mode - i.e., when VCC is below both the reset threshold and VBATT minus 20mV. It serves as a hardware flag for system-level monitoring, allowing microcontrollers to log backup events, disable non-critical peripherals, or trigger low-power states. Unlike RESET, BATT ON remains asserted as long as backup power is active, independent of reset timeout duration.

Can MAX6363LUT46 operate with a 1.2V supply, and what functions remain active?

Yes, the MAX6363LUT46 guarantees full functionality down to 1.2V on either VCC or VBATT, including RESET assertion, BATT ON indication, and switchover control. At 1.2V, the RESET output remains valid (logic low), the internal comparator continues monitoring, and the 150ms timeout timer operates correctly. This capability allows the MAX6363LUT46 to supervise ultra-low-voltage systems such as energy-harvesting nodes or deep-sleep battery-powered devices where supply may dip near cutoff.

What package type and pin count does MAX6363LUT46 use?

The MAX6363LUT46 is supplied in a 6-pin SOT23-6 package (2.9mm × 1.6mm footprint, 1.1mm height), with pin 1 designated as GND, pin 2 as VCC, pin 3 as BATT ON, pin 4 as BATT, pin 5 as OUT, and pin 6 as RESET. This compact, surface-mount package supports automated assembly and meets IPC/JEDEC standards for thermal and mechanical reliability in high-volume manufacturing environments.