Analog Devices Inc./Maxim Integrated MAX16999AUA12+T

Overview

The MAX16999AUA12+T from Maxim Integrated is a factory-preset 1.2V ultra-low-quiescent-current linear regulator delivering up to 100mA continuous output current at +125°C, featuring 13μA typical quiescent current, active-low open-drain reset with programmable POR timeout via external CRES capacitor, and logic-controlled enable. 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 MAX16999AUA12+T datasheet, MAX16999AUA12+T pinout, MAX16999AUA12+T application, or MAX16999AUA12+T equivalent, key selection criteria include guaranteed operation from -40°C to +125°C ambient, ±2.5% output voltage accuracy over load/temperature, thermal shutdown at +165°C, dropout voltage of 35mV at 80mA (VOUT = 3.3V), and compatibility with ceramic input/output capacitors (1μF/4.7μF).

Technical Context

The MAX16999AUA12+T integrates a p-channel MOSFET pass transistor, precision error amplifier, and internal 0.825×VREF reference to achieve stable 1.2V output. Its power-on-reset circuit uses a 10μA CRES pullup current charging an external capacitor to generate a programmable timeout before releasing the open-drain RESET signal.

Thermal protection activates at +165°C junction temperature with 15°C hysteresis, while undervoltage lockout disables regulation below 2.2V input with 45mV hysteresis. The EN input includes a 120kΩ internal pullup/pulldown latch, ensuring state retention even if the control line disconnects.

Key Specifications

Pinout & Package

MAX16999AUA12+T is housed in an 8-pin μMAX® package with exposed pad (U8E+2 outline), optimized for thermal dissipation on multilayer PCBs (θJA = 77.6°C/W). The exposed paddle must be soldered to a large ground plane for safe operation at full load and temperature.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A0512PDBVR and NCP114AMX12TBG, the MAX16999AUA12+T uniquely delivers integrated POR timeout, open-drain reset assertion, and guaranteed 100mA operation at +125°C - critical for automotive telematics and industrial keep-alive subsystems where timing reliability and thermal robustness are non-negotiable.

Availability

MAX16999AUA12+T is available at Aetrix Electronics and suitable for automotive telematics, industrial control modules, and portable medical devices requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX16999AUA12+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 demanding industrial, automotive, and communications applications.

The MAX16999AUA12+T belongs to Maxim's high-temperature linear regulator product line, engineered specifically for always-on subsystems in automotive infotainment, ADAS domain controllers, and industrial edge nodes where ultra-low IQ and guaranteed +125°C operation are mandatory.

FAQ

What is the exact output voltage of MAX16999AUA12+T and how is it trimmed?

The MAX16999AUA12+T delivers a factory-trimmed fixed output voltage of 1.2V. This value is laser-trimmed during production to ensure ±2.5% accuracy across load (1mA–100mA), line (2.5V–5.5V VIN), and temperature (-40°C to +125°C). The "12" suffix in MAX16999AUA12+T explicitly denotes the 1.2V variant per Maxim's Selector Guide, and no external feedback resistors are required.

How does the RESET function behave during power-up and fault conditions for MAX16999AUA12+T?

During power-up, the MAX16999AUA12+T holds RESET low until the output reaches regulation and the CRES capacitor charges to 600mV (typ), then releases RESET to high-impedance. If VOUT drops below 82.5% of nominal, RESET pulls low again. A built-in 100ms fault timer ensures RESET releases even if CRES is shorted - preventing indefinite hold-down and guaranteeing system boot reliability.

Can MAX16999AUA12+T be used in parallel with another 1.2V regulator, and what design considerations apply?

Yes, the MAX16999AUA12+T is explicitly designed for parallel operation with other 1.2V supplies (e.g., high-current DC/DC converters) to reduce total system quiescent current. Key requirements include matching output voltages within ±1%, using separate input/output capacitors per regulator, and avoiding shared CRES or RESET nets. The device's high-impedance OUT during shutdown prevents backfeeding.

What thermal performance can be expected from MAX16999AUA12+T on a standard PCB?

On a multilayer PCB, the MAX16999AUA12+T achieves θJA = 77.6°C/W, allowing 100mA continuous output at +125°C ambient without thermal shutdown. With its exposed paddle soldered to a 200mm² ground plane, power dissipation remains within safe limits up to 1030.9mW at +70°C (derating 12.9mW/°C above). Junction temperature must stay ≤+150°C for reliability.

Is MAX16999AUA12+T RoHS-compliant and what packaging does it use?

Yes, the MAX16999AUA12+T is RoHS-compliant and lead(Pb)-free, indicated by the "+" suffix. It uses Maxim's 8-pin μMAX® package with exposed thermal pad (package code U8E+2, outline 21-0107), which provides superior thermal performance versus standard SOIC or SOT-23 packages and is qualified for reflow soldering per JEDEC J-STD-020.