Analog Devices Inc./Maxim Integrated MAX16999AUA09+T

Overview

MAX16999AUA09+T from Maxim Integrated is a low-quiescent-current linear regulator delivering 100mA at preset 0.9V output, operating from 2.5V to 5.5V input, with 13μA typical quiescent current and active-low open-drain reset output. It serves as a parallel low-power supply for microcontroller core/interrupt sections during sleep mode in high-temperature automotive and industrial systems.

For engineers reviewing the MAX16999AUA09+T datasheet, MAX16999AUA09+T pinout, MAX16999AUA09+T application, or MAX16999AUA09+T equivalent, key selection criteria include guaranteed operation up to +125°C ambient, adjustable POR delay via CRES capacitor, logic-controlled enable, thermal-overload protection, and compatibility with 4.7μF ceramic output capacitance.

Technical Context

The MAX16999AUA09+T integrates a p-channel MOSFET pass transistor, precision error amplifier, and internal voltage reference to regulate 0.9V output with ±2.5% accuracy across load (1mA–100mA) and temperature (−40°C to +125°C). Its power-on-reset circuit uses a 10μA pullup current on CRES to generate programmable timeout, with deglitching and fault-timer fallback ensuring reliable startup even with faulty timing capacitors.

Undervoltage lockout activates below 2.2V (max) VIN with 45mV hysteresis, disabling regulation and ignoring EN state. Thermal shutdown triggers at +165°C junction temperature with 15°C hysteresis, enabling pulsed operation under continuous overload. The device supports parallel operation with equal-voltage supplies and maintains stability with ≤30mΩ ESR output capacitors.

Key Specifications

Pinout & Package

The MAX16999AUA09+T is housed in an 8-pin μMAX® package with exposed pad (U8E+2 outline), optimized for thermal dissipation in high-temperature applications. The exposed paddle must be soldered to a large ground plane for effective heat transfer.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A0509PDBVR and NCP114AMX09T2G, the MAX16999AUA09+T uniquely combines ultra-low 13μA quiescent current, programmable reset timeout, and guaranteed +125°C operation in a thermally enhanced μMAX package-making it optimal for automotive telematics and mission-critical keep-alive functions.

Availability

MAX16999AUA09+T is available at Aetrix Electronics and suitable for automotive telematics modules, industrial SDRAM power supplies, and handheld medical devices requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX16999AUA09+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, communications, and computing markets.

The MAX16999 series targets high-reliability, high-temperature applications such as automotive infotainment and industrial control, where ultra-low quiescent current, robust reset functionality, and thermal resilience are critical design requirements.

FAQ

What is the exact output voltage of MAX16999AUA09+T?

The MAX16999AUA09+T has a factory-preset output voltage of 0.9V, confirmed by its "09" suffix in the Selector Guide and top-mark code +AABQ. This value is trimmed during production and guaranteed within ±2.5% over temperature and load, eliminating need for external feedback resistors.

Does MAX16999AUA09+T support programmable reset timeout?

Yes, MAX16999AUA09+T supports programmable reset timeout via the CRES pin. An external capacitor connected between CRES and GND sets the delay using a 10μA internal pullup current charging to a 600mV threshold. Timeout ranges from ~30ms to >100ms depending on capacitor value, enabling flexible power-up sequencing.

What is the maximum ambient temperature for continuous operation of MAX16999AUA09+T?

MAX16999AUA09+T is rated for continuous operation at ambient temperatures up to +125°C when mounted on a multilayer PCB, as verified in Table 1 of the datasheet. At this temperature, it delivers full 100mA output current without thermal shutdown, supported by its μMAX-EP package's 77.6°C/W θJA.

Can MAX16999AUA09+T be used in parallel with another regulator?

Yes, MAX16999AUA09+T is explicitly designed for parallel operation with other equal-voltage supplies, as stated in the Applications Information section. It functions as a low-IQ companion to high-current regulators (e.g., powering μC interrupt logic while a main LDO handles core loads), minimizing total system quiescent current.

What capacitor values are required for stable operation of MAX16999AUA09+T?

MAX16999AUA09+T requires a minimum 1μF ceramic capacitor between IN and GND, and a 4.7μF ceramic capacitor between OUT and GND. The output capacitor must have ≤30mΩ ESR for stability; surface-mount ceramics meeting this spec are widely available and should be placed as close as possible to the device pins.