Analog Devices Inc./Maxim Integrated MAX16023LTAL18+T

Overview

MAX16023LTAL18+T from Maxim Integrated is a low-power battery-backup circuit with integrated 1.8V LDO regulator, µP reset supervisor, and automatic VCC/BATT switchover logic. It delivers up to 100mA output current, features push-pull RESET output, 4.63V reset threshold, and operates from 1.53V to 5.5V input. It is designed for SRAM/RTC backup power in brownout conditions.

For engineers reviewing the MAX16023LTAL18+T datasheet, MAX16023LTAL18+T pinout, MAX16023LTAL18+T application, or MAX16023LTAL18+T equivalent, key selection criteria include regulated 1.8V output accuracy (±2.5%), ultra-low 4µA supply current, 145ms reset timeout, battery-on detection capability, and compatibility with industrial temperature range (–40°C to +85°C).

Technical Context

The MAX16023LTAL18+T integrates a precision low-dropout linear regulator (1.8V ±2.5%), a microprocessor reset supervisor with 4.63V threshold and 145ms timeout, and a seamless battery switchover circuit that activates when VCC falls below both the reset threshold and VBATT while the LDO enters dropout. It includes debounced manual-reset input (MR) and power-fail comparator input (PFI) referenced to 0.59V.

This device implements a battery freshness seal that isolates BATT from internal circuitry until first VCC application, ensuring shelf-life preservation. The push-pull RESET output drives low to 0.3V at 3.2mA sink load, and the LDO maintains regulation down to 150mV dropout at 50mA load - critical for maintaining SRAM data integrity during gradual brownout transitions.

Key Specifications

Pinout & Package

MAX16023LTAL18+T is housed in an 8-pin TDFN-EP package (3mm × 3mm, 0.75mm height) with exposed pad thermally connected to GND. The package supports high-density PCB layout and efficient thermal dissipation in space-constrained backup power circuits.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar battery-backup supervisor applications.

Compared with MAX16024LTBL18+T, MAX16023LTAL18+T saves board area and cost by omitting CE gating but retains identical 1.8V LDO performance and reset behavior; versus TPS3808G18DBVR, it eliminates three external components (LDO, diode, resistor) and reduces total solution size by >40%.

Availability

MAX16023LTAL18+T is available at Aetrix Electronics and suitable for industrial controls, GPS systems, point-of-sale equipment, and portable/battery equipment requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for MAX16023LTAL18+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, communications, and computing applications.

The MAX16023/MAX16024 family was engineered specifically for compact, low-power memory backup systems - integrating LDO regulation, reset supervision, and battery switchover into a single 8-pin TDFN to replace discrete solutions in SRAM/RTC applications.

FAQ

What is the regulated output voltage of the MAX16023LTAL18+T?

The MAX16023LTAL18+T provides a factory-trimmed, fixed 1.8V regulated output with ±2.5% accuracy over –40°C to +85°C. This voltage is delivered by its integrated low-dropout linear regulator and is specified to maintain regulation down to 150mV dropout at 50mA load. The 1.8V output directly powers 1.8V SRAM or RTC ICs without external components.

Does the MAX16023LTAL18+T support battery switchover, and what conditions trigger it?

Yes, the MAX16023LTAL18+T automatically switches the LDO output from VCC to the BATT pin when three conditions are met: VCC falls below the 4.63V reset threshold, VCC is lower than VBATT, and the LDO enters dropout. This ensures uninterrupted 1.8V power to memory during brownout. The battery freshness seal prevents BATT discharge until first VCC application.

What is the reset timeout period of the MAX16023LTAL18+T, and how is it guaranteed?

The MAX16023LTAL18+T features a minimum reset timeout period of 145ms after VCC rises above the 4.63V threshold. This value is production-tested at +25°C and +85°C, and temperature-compensated design ensures it remains ≥145ms across –40°C to +85°C. The timeout is implemented with an internal oscillator and delay logic, independent of external capacitors.

Can the MAX16023LTAL18+T monitor a second voltage rail, and how is this implemented?

Yes, the MAX16023LTAL18+T includes a dedicated power-fail comparator with PFI and PFO pins. By connecting PFI to a resistive divider from the secondary rail, the device detects when that rail falls below ~0.59V (internal reference). PFO asserts low to signal the event - usable as a µP interrupt or to trigger an orderly shutdown before main supply collapse.

What package type and thermal characteristics does the MAX16023LTAL18+T use?

The MAX16023LTAL18+T uses an 8-pin TDFN-EP package (3mm × 3mm, 0.75mm height) with exposed pad connected to GND. Its thermal resistance θJA is 41°C/W on a 4-layer JEDEC-standard board. The exposed pad must be soldered to a large copper ground plane to achieve rated 1951mW power dissipation at +70°C ambient.