Analog Devices Inc./Maxim Integrated MAX5023TASA+T

Overview

MAX5023TASA+T 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, withstands −60V reverse-battery voltage, and features active-low open-drain RESET with 200ms timeout. It is used in fire/smoke alarms and automotive body control modules requiring robust brownout detection and fail-safe restart.

For engineers reviewing the MAX5023TASA+T datasheet, MAX5023TASA+T pinout, MAX5023TASA+T application, or MAX5023TASA+T equivalent, key selection criteria include its −60V reverse-battery protection, 60μA no-load quiescent current, 1.6s watchdog timeout, −7.5% reset threshold tolerance (per T-suffix), and thermally enhanced 8-pin SO-EP package with exposed pad.

Technical Context

The MAX5023TASA+T implements a BiCMOS linear regulator with internal bandgap reference, thermal shutdown at +150°C (20°C hysteresis), and reverse-battery protection circuitry that limits reverse input current to ≤10μA at −60V. Its μP reset circuit monitors VOUT against a trimmed −7.5% threshold (VTH = 2.970V to 3.135V for +3.3V output) and asserts open-drain RESET for 140–260ms after recovery.

It integrates a watchdog timer (WDI input) that triggers RESET if no edge occurs within 1.12–2.08s; RESET remains asserted for 200ms regardless of subsequent WDI activity. The HOLD input enables self-holding operation: pulling HOLD low after EN activation maintains regulation even if EN returns low, eliminating external latching components.

Key Specifications

Pinout & Package

MAX5023TASA+T is housed in an 8-pin surface-mount SO-EP (Small Outline–Exposed Pad) package. The exposed pad must be soldered to PCB ground plane for thermal dissipation (θJC = 2°C/W, θJA = 41°C/W). Package dimensions comply with JEDEC MS-012AA, and the device is RoHS-compliant (+ suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX5024TASA+T and TPS7B8733QKVURQ1, the MAX5023TASA+T uniquely combines −60V reverse protection, integrated 1.6s watchdog, and self-holding HOLD logic in a single 8-pin SO-EP package-making it optimal for safety-critical automotive and alarm systems requiring both supervision and latch-on capability.

Availability

MAX5023TASA+T is available at Aetrix Electronics and suitable for automotive body electronics, fire/smoke alarm systems, and industrial remote I/O nodes requiring stable component supply across extended temperature and harsh electrical environments.

Supply support for MAX5023TASA+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for demanding industrial, automotive, and communications applications.

The MAX5023/MAX5024 product line was designed specifically for automotive and industrial power-supply supervision-integrating high-voltage regulation, reverse-battery resilience, precise reset monitoring, and watchdog timing in a thermally robust package.

FAQ

What is the reset threshold voltage for MAX5023TASA+T?

The MAX5023TASA+T has a −7.5% reset threshold tolerance for its +3.3V output, meaning RESET asserts when VOUT falls below 2.970V and remains asserted for 140–260ms after recovery. This threshold is factory-trimmed and guaranteed across −40°C to +125°C. The T-suffix explicitly denotes this −7.5% variant, distinguishing it from M-suffix (−12.5%) devices. The MAX5023TASA+T uses the same internal reference for both regulation and reset, ensuring tracking accuracy.

Does MAX5023TASA+T support adjustable output voltage?

No, the MAX5023TASA+T does not support adjustable output voltage. It is a fixed +3.3V output device. Adjustable operation is exclusive to the MAX5024 family (e.g., MAX5024TASA+T), which includes the SET pin for configuring outputs from +2.5V to +11V via external resistors. The MAX5023TASA+T lacks the SET pin and internal feedback divider for adjustment; its output is trimmed and fixed at +3.3V with ±3.6% tolerance over temperature and load.

How does the HOLD function work on MAX5023TASA+T?

The HOLD input on MAX5023TASA+T is an active-low signal that enables self-holding behavior: after EN is pulled high to turn on the regulator, pulling HOLD low latches the output ON-even if EN subsequently goes low. To shut down, release HOLD (let it float or connect to OUT) while EN remains low. An internal 4μA current source pulls HOLD to OUT when floating, ensuring predictable release. This eliminates external latching circuitry in ignition-switched automotive applications.

What is the maximum power dissipation of MAX5023TASA+T at +105°C ambient?

At +105°C ambient, the MAX5023TASA+T's maximum continuous power dissipation is 1.17W. This is calculated using the derating formula: PD = 1.538W − 0.01923W/°C × (105°C − 70°C) = 1.17W. With VIN = +14V and VOUT = +3.3V, this allows up to ~110mA output current before thermal shutdown activates. The SO-EP package's exposed pad must be soldered to ≥1in² of PCB copper to achieve this rating; insufficient copper reduces safe operating current.

Is MAX5023TASA+T qualified for automotive applications?

Yes, MAX5023TASA+T is automotive-qualified: it operates across −40°C to +125°C junction temperature, meets AEC-Q100 stress testing requirements (as indicated by the /V designation in related variants), and includes features essential for automotive use-including −60V reverse-battery protection, load-dump tolerant input range (+6.5V to +65V), and integrated watchdog/reset for ECU reliability. Though the "/V" suffix is absent in MAX5023TASA+T's marking, its datasheet specifies automotive temperature range and application suitability, and the ASA package variant is used in automotive designs.