Analog Devices Inc./Maxim Integrated MAX5023TASA+

Overview

MAX5023TASA+ from Maxim Integrated is a high-voltage linear regulator with integrated microprocessor reset and watchdog timer, designed for automotive power-supply supervision. It operates from +6.5V to +65V input, delivers up to 150mA output current at fixed +3.3V, consumes only 60μA quiescent current, withstands −60V reverse-battery voltage, and asserts active-low RESET when VOUT drops below 2.97V (−12.5% threshold). It is used in ignition-controlled vehicle subsystems requiring robust brownout detection and fail-safe restart.

For engineers reviewing the MAX5023TASA+ datasheet, MAX5023TASA+ pinout, MAX5023TASA+ application, or MAX5023TASA+ equivalent, key selection criteria include its −60V reverse-battery protection, 1.6s watchdog timeout, self-holding circuit capability via HOLD/EN logic, and guaranteed operation across −40°C to +125°C for automotive under-hood environments.

Technical Context

The MAX5023TASA+ implements a BiCMOS linear regulator with internal bandgap reference and thermal shutdown at +150°C (20°C hysteresis). Its reset supervisor shares the same reference as the regulator and triggers on VOUT falling below 2.97V (−12.5% of 3.3V), holding RESET low for 200ms after recovery.

The watchdog timer monitors WDI transitions and asserts RESET if no edge occurs within 1.12–2.08s; it remains asserted for 200ms regardless of subsequent WDI activity during that period. The HOLD input enables latch-up behavior: pulling HOLD low after EN activation maintains regulation even if EN returns low, eliminating need for external latching components.

Key Specifications

Pinout & Package

MAX5023TASA+ uses an 8-pin SO-EP (small-outline with exposed pad) package. The exposed pad must be soldered to PCB ground plane for thermal dissipation (θ_JA = 41°C/W, θ_JC = 2°C/W). Maximum continuous power dissipation is 1538mW at +70°C, derating 19.2mW/°C above that.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage linear regulator applications.

Compared with MAX5023TASA+, MAX5024TASA+ trades watchdog capability for output flexibility, while TPS7B8733QKVURQ1 reduces complexity and IQ but shifts supervision responsibility to external firmware-making MAX5023TASA+ optimal for standalone, safety-critical reset autonomy.

Availability

MAX5023TASA+ is available at Aetrix Electronics and suitable for automotive body control, telematics, ADAS camera ECUs, and commercial vehicle tracking systems requiring stable component supply across extended temperature and voltage ranges.

Supply support for MAX5023TASA+ 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 precision analog, mixed-signal, and power-management ICs for demanding industrial, automotive, and communications applications.

The MAX5023/MAX5024 product line targets automotive power-supply supervision, integrating high-voltage regulation, reset generation, and watchdog timing into a single thermally enhanced SO-EP package for under-hood reliability.

FAQ

What is the exact reset threshold voltage for MAX5023TASA+?

The MAX5023TASA+ has a preset −12.5% reset threshold relative to its +3.3V output, resulting in a guaranteed VTH of 2.970V to 3.135V (min/typ/max). This threshold is monitored continuously and asserts the open-drain RESET pin low when VOUT falls below that level, remaining asserted for 200ms after VOUT recovers above the threshold. The MAX5023TASA+ uses this specific threshold variant per its 'T' suffix in the Selector Guide.

Does MAX5023TASA+ support adjustable output voltage?

No, MAX5023TASA+ does not support adjustable output voltage. It is a fixed +3.3V regulator with internal feedback resistors. The SET pin is absent in the MAX5023 family; only MAX5024 variants include SET for adjustable operation (2.5V–11V). MAX5023TASA+ pin 7 is WDI, not SET, and connecting any external network to unused pins may impair functionality or reliability.

How does the HOLD function work in MAX5023TASA+?

In MAX5023TASA+, the HOLD pin (pin 5) implements a self-holding circuit: after enabling the regulator with EN high, pulling HOLD low latches the output ON-even if EN subsequently goes low. To shut down, release HOLD (by pulling it high or leaving it open, as it's internally pulled up to OUT). This eliminates external latching components in ignition-switched automotive modules where EN follows key position but regulation must persist.

What is the maximum allowable input voltage for MAX5023TASA+?

The absolute maximum input voltage for MAX5023TASA+ is +70V (IN to GND), but the specified operational range is +6.5V to +65V. Operation at +65V is fully characterized and guaranteed across −40°C to +125°C. Exceeding +65V risks violating safe operating area limits, especially under load, and is not recommended for production designs. Reverse input voltage tolerance is −60V, critical for automotive jump-start scenarios.

Is MAX5023TASA+ qualified for automotive applications?

Yes, MAX5023TASA+ is automotive-qualified: it operates across −40°C to +125°C junction temperature, features −60V reverse-battery protection, and is manufactured in a process meeting AEC-Q100 stress test requirements. Though the /V suffix denotes formal AEC-Q100 qualification, the ASA package variant (including MAX5023TASA+) is specified and tested for automotive use per Maxim's data sheet and ordering guide, with thermal, ESD, and transient performance validated for under-hood deployment.