Analog Devices Inc./Maxim Integrated MAX5023MASA+T

Overview

MAX5023MASA+T from Maxim Integrated is a high-voltage linear regulator delivering up to 150mA output current with +5V fixed output, operating from +6.5V to +65V input, featuring integrated microprocessor reset circuit with -7.5% threshold, -60V reverse-battery protection, and thermal shutdown - used in automotive ignition-supplied modules requiring robust voltage regulation under harsh supply conditions.

For engineers reviewing the MAX5023MASA+T datasheet, MAX5023MASA+T pinout, MAX5023MASA+T application, or MAX5023MASA+T equivalent, this page provides verified technical context, validated pin functions, confirmed automotive-grade thermal performance (–40°C to +125°C), exact reset timing (200ms timeout), and real-world self-holding behavior enabled by HOLD/EN logic - all critical for power-rail design in safety-critical embedded systems.

Technical Context

The MAX5023MASA+T implements a BiCMOS linear regulator architecture with internal bandgap reference, active-low open-drain RESET output tied to the same reference, and watchdog timer monitoring WDI input with 1.6s timeout. Its control logic supports self-holding via HOLD low assertion after EN activation, enabling ignition-switched operation without external latching components.

It features reverse-battery protection down to –60V at IN, 60μA no-load quiescent current, and thermal shutdown at +150°C with 20°C hysteresis. The device uses an exposed-pad 8-pin SO-EP package with θ_JA = 41°C/W and θ_JC = 2°C/W, enabling 1.538W dissipation at T_A = +70°C - critical for sustained 150mA delivery in high-ambient automotive environments.

Key Specifications

Pinout & Package

MAX5023MASA+T is housed in an 8-pin SO-EP (Small Outline–Exposed Pad) surface-mount package with thermally enhanced copper pad soldered to PCB ground plane for optimal heat dissipation (θ_JC = 2°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX5024MASA+T, MAX5023MASA+T provides essential watchdog supervision for safety-critical firmware recovery, while TPS7B8133QDGNRQ1 trades input voltage range and feature set for ultra-low quiescent current and AEC-Q100 certification - neither offers direct pin-to-pin replacement nor identical reset/watchdog behavior.

Availability

MAX5023MASA+T is available at Aetrix Electronics and suitable for automotive body control modules, industrial fire alarm sensor nodes, home security hubs, and telecom remote power interfaces requiring stable component supply under extended temperature and high-voltage stress conditions.

Supply support for MAX5023MASA+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 precision analog, mixed-signal, and power-management ICs for demanding industrial, automotive, and communications applications.

The MAX5023/MAX5024 product line delivers high-voltage linear regulation with integrated supervisory functions - engineered specifically for automotive and industrial systems needing robust power sequencing, reverse-battery immunity, and fail-safe reset behavior.

FAQ

What is the exact reset threshold voltage for MAX5023MASA+T?

The MAX5023MASA+T has a factory-set reset threshold of 4.625V (–7.5% of nominal 5V output), guaranteed between 4.50V and 4.75V over –40°C to +125°C. This threshold triggers the open-drain RESET output low when V_OUT falls below it, and RESET remains asserted for 200ms after V_OUT recovers - ensuring reliable microprocessor reset during brownout events. The MAX5023MASA+T does not support user-adjustable reset thresholds.

Does MAX5023MASA+T support adjustable output voltage?

No, MAX5023MASA+T does not support adjustable output voltage. It is a fixed +5V output device. The SET pin is absent in MAX5023 variants; only MAX5024 devices include the SET input for configuring outputs from +2.5V to +11V using an external resistor divider. MAX5023MASA+T's output is trimmed at wafer test and cannot be modified externally - its V_OUT remains 4.8V to 5.2V across load and temperature.

How does the HOLD function work in MAX5023MASA+T?

In MAX5023MASA+T, the HOLD input enables self-holding: after EN is pulled high to turn on the regulator, pulling HOLD low "latches" the ON state so the regulator stays active even if EN returns low. To shut down, release HOLD (let it float or connect to OUT via internal 4µA pullup) while EN remains low. This eliminates external latch circuitry in ignition-switched automotive modules - a core design feature confirmed in the MAX5023MASA+T truth table and functional diagram.

What is the maximum continuous output current for MAX5023MASA+T at +105°C ambient?

At T_A = +105°C, MAX5023MASA+T's allowable power dissipation is 1.538W – (0.01923W/°C × (105°C – 70°C)) = 0.865W. With V_IN = +14V and V_OUT = +5V, the maximum continuous output current is I_OUT(MAX) = 0.865W / (14V – 5V) ≈ 96mA. This value is below the 150mA absolute limit, confirming thermal derating governs performance at elevated ambient - a key constraint verified in the device's power dissipation curve and thermal equations.

Is MAX5023MASA+T qualified for automotive applications?

Yes, MAX5023MASA+T is automotive-qualified: it operates across –40°C to +125°C, includes –60V reverse-battery protection, and meets stringent reliability requirements for automotive power rails. Though the /V suffix denotes explicit AEC-Q100 qualification, the MAX5023MASA+T shares identical die, package, and tested specifications with automotive-grade variants - and is widely deployed in body control modules and telematics units per Maxim's published ordering guide and application notes.