Analog Devices Inc./Maxim Integrated MAX16999AUA10+

Overview

MAX16999AUA10+ from Maxim Integrated is a low-quiescent-current linear regulator delivering 100mA at up to +125°C, with preset 1.0V output, 13μA quiescent current, and active-low open-drain reset with programmable POR delay. It powers microcontroller core/interrupt sections during sleep mode and supports keep-alive timers in high-temperature automotive and industrial systems.

For engineers reviewing the MAX16999AUA10+ datasheet, MAX16999AUA10+ pinout, MAX16999AUA10+ application, or MAX16999AUA10+ equivalent, key selection criteria include ultra-low IQ (13μA typ), factory-trimmed 1.0V output, adjustable reset timeout via CRES capacitor, thermal shutdown at +165°C, and operation across -40°C to +125°C ambient.

Technical Context

The MAX16999AUA10+ 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 POR timer uses a 10μA CRES pullup current charging an external capacitor to generate reset timeout, with fault-timer fallback ensuring startup even if CRES shorts.

Logic-controlled enable latches EN state via 120kΩ internal resistors; when disabled, ground current drops to ≤1μA. Undervoltage lockout activates below 2.2V (max) with 45mV hysteresis, forcing OUT into high-impedance regardless of EN state.

Key Specifications

Pinout & Package

MAX16999AUA10+ 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).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A0510PDBVR and NCP1117ST10T3G, MAX16999AUA10+ uniquely combines 13μA IQ, integrated POR timing, and active-low reset in an 8-pin μMAX package - making it the sole option for automotive-grade, sequenced, low-power microcontroller bias rails requiring guaranteed startup and thermal resilience.

Availability

MAX16999AUA10+ is available at Aetrix Electronics and suitable for automotive telematics, industrial microcontroller keep-alive circuits, and handheld device low-power bias rails requiring stable component supply across extended temperature ranges.

Supply support for MAX16999AUA10+ 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-reliability analog and mixed-signal ICs for automotive, industrial, and communications applications.

The MAX16999AUA10+ belongs to Maxim's high-temperature linear regulator product line, engineered specifically for always-on, low-power biasing of microcontrollers and memory in harsh thermal environments.

FAQ

What is the exact output voltage of MAX16999AUA10+ and how is it trimmed?

The MAX16999AUA10+ has a factory-trimmed fixed output voltage of 1.0V, with ±2.5% accuracy over temperature (-40°C to +125°C) and load (1mA to 100mA). This precision is achieved using internal laser trimming during wafer sort, eliminating the need for external feedback resistors and ensuring consistent performance across production lots without user calibration.

How does the CRES pin function in MAX16999AUA10+ and what capacitor value sets a 50ms reset timeout?

The CRES pin in MAX16999AUA10+ sources a 10μA current to charge an external capacitor, generating a programmable power-on-reset timeout. Using the formula t_POR ≈ C_CRES × 60 × 10³, a 50ms timeout requires approximately 830pF. The datasheet confirms CRES = 15nF yields ~80ms, so 50ms corresponds to ~12.5nF - verified by Figure 18's linear CRES vs. timeout curve.

Does MAX16999AUA10+ support parallel operation with other regulators, and what design precautions apply?

Yes, MAX16999AUA10+ is explicitly designed for parallel operation with equal-voltage supplies (e.g., MAX1745), as shown in Figure 2 of its datasheet. To ensure stable current sharing, both regulators must have matched output voltages (±1% recommended), and the MAX16999AUA10+'s low dropout and tight accuracy minimize circulating current - no external ballast resistors are needed.

What protection features are integrated into MAX16999AUA10+, and how do they behave under fault conditions?

MAX16999AUA10+ integrates short-circuit protection (150mA current limit), thermal-overload shutdown (+165°C trip with 15°C hysteresis), and UVLO (2.2V threshold with 45mV hysteresis). During overload, it enters pulsed current-limit mode; during thermal fault, it cycles ON/OFF until cooled; during UVLO, OUT forces high-impedance regardless of EN state - all behavior is fully characterized in the Absolute Maximum and DC Electrical Characteristics tables.

Is MAX16999AUA10+ RoHS-compliant and what does the '+' suffix indicate in its part number?

Yes, MAX16999AUA10+ is RoHS-compliant and lead(Pb)-free, as confirmed by the '+' suffix per Maxim's packaging nomenclature. The '+' denotes full compliance with EU RoHS Directive 2011/65/EU and related exemptions, and the device meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1) for unlimited floor life at ≤30°C/85% RH.