Analog Devices Inc./Maxim Integrated MAX16999AUA11+T

Overview

MAX16999AUA11+T from Maxim Integrated is a low-quiescent-current linear regulator delivering 100mA at up to +125°C, with preset 1.1V output, 13μA quiescent current, and active-low open-drain reset with capacitor-programmable timeout. It serves as a parallel low-power supply for microcontroller core or interrupt sections during sleep mode in high-temperature automotive and industrial systems.

For engineers reviewing the MAX16999AUA11+T datasheet, MAX16999AUA11+T pinout, MAX16999AUA11+T application, or MAX16999AUA11+T equivalent, key selection criteria include ultra-low IQ, factory-trimmed 1.1V output, thermal shutdown at +165°C, adjustable POR delay via CRES, and operation across –40°C to +125°C ambient.

Technical Context

The MAX16999AUA11+T integrates a p-channel MOSFET pass transistor, precision error amplifier, and internal voltage reference to regulate output with ±2.5% accuracy over load and temperature. Its power-on-reset (POR) circuit uses a 10μA CRES pullup current charging an external capacitor to generate a programmable reset timeout, with fault-timer fallback ensuring reliable startup even if CRES fails short.

Logic-controlled enable (EN) latches its state via 120kΩ internal resistors and forces OUT into high-impedance when disabled, reducing supply current to ≤1μA. Undervoltage lockout activates below 2.2V (with 45mV hysteresis), disabling regulation regardless of EN state - critical for stable sequencing in multi-rail systems.

Key Specifications

Pinout & Package

MAX16999AUA11+T is housed in an 8-pin μMAX® package with exposed pad (U8E+2 outline), optimized for thermal dissipation in high-temperature PCB environments. The exposed paddle must be soldered to a large ground plane to achieve θJA = 77.6°C/W on multilayer boards.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-quiescent linear regulator applications.

Compared with TPS7A0511PDBVR and NCP114AMX110TBG, the MAX16999AUA11+T uniquely combines factory-trimmed 1.1V output, 13μA IQ, and capacitor-programmable POR with fault-timer safety - making it optimal for automotive and high-reliability industrial sequencing where precise, fail-safe power-up timing is mandatory.

Availability

MAX16999AUA11+T is available at Aetrix Electronics and suitable for SDRAM power supplies, keep-alive timers, and industrial microcontroller sleep rails requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX16999AUA11+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 high-performance analog and mixed-signal ICs for automotive, industrial, and communications applications.

The MAX16999 series targets high-temperature, ultra-low-power regulation in automotive telematics and industrial microcontrollers - emphasizing reliability, precise POR control, and minimal quiescent consumption in harsh thermal environments.

FAQ

What is the exact output voltage of MAX16999AUA11+T?

The MAX16999AUA11+T has a factory-trimmed fixed output voltage of 1.1V, confirmed by the "11" suffix in the part number and the Selector Guide. This value is guaranteed within ±2.5% over load (1mA–100mA), temperature (–40°C to +125°C), and line (VIN = VOUT + 2V) conditions, eliminating need for external feedback components.

Does MAX16999AUA11+T include thermal protection?

Yes, MAX16999AUA11+T incorporates thermal-overload protection that disables the pass transistor when junction temperature exceeds +165°C. It re-enables automatically after cooling by 15°C, providing pulsed output during continuous overload. This feature is fully specified and tested per JEDEC standards, ensuring safe operation in enclosed or high-ambient environments.

How is the reset timeout programmed on MAX16999AUA11+T?

The reset timeout on MAX16999AUA11+T is programmed by connecting an external capacitor to the CRES pin. With a typical 10μA internal pullup current, a 15nF capacitor yields ~30ms timeout; larger values scale linearly. A built-in 100ms fault timer guarantees maximum timeout even if CRES shorts - a safety feature explicitly documented for MAX16999AUA11+T in the datasheet.

What package type does MAX16999AUA11+T use?

MAX16999AUA11+T uses the 8-pin μMAX® package with exposed pad (package code U8E+2, outline 21-0107). The "+T" suffix confirms RoHS-compliance, and the exposed paddle must be soldered to a PCB ground plane to achieve rated thermal performance (θJA = 77.6°C/W on multilayer boards).

Can MAX16999AUA11+T be used in parallel with another regulator?

Yes, MAX16999AUA11+T is explicitly designed for parallel operation with other equal-voltage supplies, as stated in the Applications Information section. Its low dropout and tight output accuracy allow it to share load without destabilizing the main rail - commonly used to add low-IQ sleep-mode capability alongside higher-current DC-DC converters in μC power architectures.