Analog Devices Inc./Maxim Integrated MAX16024LTBR+T

Overview

The MAX16024LTBR+T from Maxim Integrated is a low-power, 10-pin battery-backup circuit with adjustable regulated output (1.8V–5.25V), push-pull reset output, and 2.63V reset threshold. It integrates a 100mA LDO, µP reset supervisor, battery switchover logic, battery-on indicator, and chip-enable gating - all in a -40°C to +85°C industrial-grade TDFN package. It powers SRAM/RTC backup during brownout while preventing data corruption via CE signal locking.

For engineers reviewing the MAX16024LTBR+T datasheet, MAX16024LTBR+T pinout, MAX16024LTBR+T application, or MAX16024LTBR+T equivalent, key selection criteria include its 2.63V reset threshold, 1.53V–5.5V input range, 4µA typical supply current, 1.5ns CEIN-to-CEOUT propagation delay, and factory-trimmed ±1.5% output voltage accuracy at 2.5V.

Technical Context

The MAX16024LTBR+T implements a dual-supply LDO architecture that automatically switches from VCC to BATT when VCC falls below 2.63V, VBATT > VCC, and dropout occurs - enabling seamless memory backup without external control. Its internal freshness seal isolates the battery until first power-up, preserving shelf life.

It features integrated chip-enable gating: CEIN drives CEOUT with 1.5ns propagation delay during normal operation, but locks CEOUT high for 12µs upon reset assertion to prevent erroneous writes to CMOS RAM. The BATT ON output asserts high exclusively in battery-backup mode, providing unambiguous status indication.

Key Specifications

Pinout & Package

MAX16024LTBR+T is housed in a 10-pin 3mm × 3mm TDFN-EP package with exposed pad (internally connected to GND) for thermal dissipation. Pin 1 is top-left corner (marked dot), pin numbering proceeds counterclockwise.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX16024LTBR+T, MAX16024LTBS25+T trades output adjustability for simpler implementation, while MAX16023LTBR25+T reduces pin count and adds PFI monitoring at the cost of CE signal integrity features - making MAX16024LTBR+T optimal for systems requiring both flexible voltage and robust memory write protection.

Availability

MAX16024LTBR+T is available at Aetrix Electronics and suitable for industrial controls, GPS systems, and portable/battery equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX16024LTBR+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 and mixed-signal ICs for power management, sensing, and interface applications in industrial, automotive, and communications markets.

The MAX16023/MAX16024 family was engineered specifically for reliable memory backup in mission-critical systems - integrating LDO regulation, reset supervision, battery switchover, and CE signal gating into a single compact package.

FAQ

What is the exact reset threshold voltage for MAX16024LTBR+T?

The MAX16024LTBR+T has a nominal reset threshold of 2.63V, with guaranteed minimum and maximum values of 2.549V and 2.755V respectively across -40°C to +85°C. This threshold is factory-trimmed and applies to the VCC supply rail - triggering RESET assertion when VCC falls below this level during brownout conditions.

How does the battery freshness seal function in MAX16024LTBR+T?

The MAX16024LTBR+T incorporates an internal battery freshness seal that electrically isolates the BATT pin from the LDO and internal circuitry until VCC is first applied. This prevents backup battery discharge during storage. Once VCC rises above ~1.53V, the seal latches open - allowing BATT to power the device only after initial power-up, ensuring full battery capacity at end-user deployment.

Can MAX16024LTBR+T be used with a fixed output voltage instead of adjustable?

No - MAX16024LTBR+T is specifically the adjustable-output variant of the MAX16024 family. Its SET pin must be connected to an external resistor divider between OUT and GND to define the output voltage (1.8V–5.25V). For fixed-output versions (e.g., 2.5V), use part numbers like MAX16024LTBS25+T, which omit the SET function and tie that pin internally.

What is the purpose of the CEIN and CEOUT pins on MAX16024LTBR+T?

The CEIN and CEOUT pins implement chip-enable signal gating: CEIN passes through to CEOUT during normal operation, but CEOUT is locked high for 12µs upon RESET assertion - preventing spurious writes to CMOS RAM during power failure. This feature is unique to MAX16024 variants and is absent in MAX16023, making MAX16024LTBR+T essential for systems requiring guaranteed memory write integrity.

What is the maximum continuous output current supported by MAX16024LTBR+T?

The MAX16024LTBR+T supports up to 100mA of continuous output current from its integrated LDO regulator. This rating applies under specified thermal conditions (TA ≤ +70°C, θJA = 41°C/W) with proper PCB copper pour on the exposed pad. Short-circuit duration is limited to 10 seconds to avoid thermal damage - consistent with its role in powering low-current SRAM or RTC loads.