Analog Devices Inc./Maxim Integrated MAX16999AUA13+

Overview

MAX16999AUA13+ from Maxim Integrated is a low-quiescent-current linear regulator delivering 100mA at up to +125°C, with preset 1.3V output, 13μA typical quiescent current, and active-low open-drain reset with capacitor-programmable timeout. It powers microcontroller core/interrupt sections during sleep mode in automotive telematics and industrial keep-alive systems.

For engineers reviewing the MAX16999AUA13+ datasheet, MAX16999AUA13+ pinout, MAX16999AUA13+ application, or MAX16999AUA13+ equivalent, this page provides verified technical context, package mapping, real-world timing behavior, thermal protection thresholds, and validated alternative options for high-temperature always-on power design.

Technical Context

The MAX16999AUA13+ integrates a p-channel MOSFET pass transistor, precision error amplifier, and internal 0.825×VREF reference to regulate 1.3V output across input voltages from 2.5V to 5.5V. Its POR timer uses 10μA CRES pullup current charging an external capacitor to generate reset timeout, with fault timer fallback at 100ms.

Undervoltage lockout activates below 2.2V (max) with 45mV hysteresis; thermal shutdown triggers at +165°C with 15°C hysteresis; short-circuit protection sustains continuous output shorting. EN input is latched via 120kΩ internal resistor and forces OUT to high impedance when low.

Key Specifications

Pinout & Package

MAX16999AUA13+ uses 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 MAX16999AUA13+, TPS7A0513PDBVR offers higher current but omits critical reset functionality, while NCP1117ST13T3G trades away enable control, thermal robustness, and quiescent efficiency-making MAX16999AUA13+ uniquely suited for automotive-grade always-on subsystems requiring coordinated power sequencing.

Availability

MAX16999AUA13+ is available at Aetrix Electronics and suitable for automotive telematics, industrial keep-alive timers, and portable device core retention requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX16999AUA13+ 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 designs high-performance analog and mixed-signal semiconductors for demanding industrial, automotive, and computing applications.

The MAX16999 belongs to Maxim's high-temperature linear regulator product line, engineered specifically for always-on power domains in automotive and industrial systems where reliability at +125°C ambient is mandatory.

FAQ

What is the exact output voltage of MAX16999AUA13+?

The MAX16999AUA13+ has a factory-preset output voltage of 1.3V, trimmed to ±2.5% accuracy over temperature and load. This value is confirmed in the Selector Guide (suffix "13") and guaranteed across –40°C to +125°C ambient, with no external feedback components required. The 1.3V output is specifically intended for low-voltage microcontroller core or interrupt domains.

Does MAX16999AUA13+ include a reset output, and how is its timeout set?

Yes, MAX16999AUA13+ features an active-low, open-drain RESET output that remains asserted until the output reaches regulation and the CRES capacitor charges to 600mV. Timeout is set by an external capacitor on the CRES pin: 15nF yields ~80ms delay, while grounding CRES gives minimum 30ms. The internal 10μA pullup current and fault timer ensure reliable startup even with capacitor faults.

What thermal protection does MAX16999AUA13+ provide, and at what junction temperature does it activate?

MAX16999AUA13+ includes thermal-overload protection that disables the pass transistor when junction temperature exceeds +165°C, with 15°C hysteresis. Once cooled below +150°C, regulation resumes. This safeguard is fully characterized and guaranteed over the full –40°C to +125°C ambient range, and the exposed pad (EP) must be soldered to a thermal pad to achieve specified θJA = 77.6°C/W on multilayer boards.

Can MAX16999AUA13+ be used in parallel with another regulator, and what is the design requirement?

Yes, MAX16999AUA13+ is explicitly designed for parallel operation with another supply of equal voltage, as documented in Figure 2 of the datasheet. This configuration supports low-power MCU sleep modes while a high-current rail handles active states. No external diodes or ballast resistors are needed-the MAX16999AUA13+'s architecture inherently avoids backfeed and current imbalance when paired with same-VOUT sources.

What is the maximum continuous output current for MAX16999AUA13+ at +125°C ambient?

At TA = +125°C, MAX16999AUA13+ delivers up to 100mA continuously without thermal shutdown, as verified in Table 1 of the datasheet for VOUT = 1.3V. This rating assumes proper PCB thermal design: multilayer board with EP connected to a large ground plane. Derating is not required below +125°C ambient, and the device maintains ±2.5% output accuracy across this full load range.