Analog Devices Inc./Maxim Integrated MAX5024LASA+T

Overview

MAX5024LASA+T from Maxim Integrated is a high-voltage linear regulator with integrated microprocessor reset circuit, fixed +5V output, and SET-input-based voltage selection logic. It operates from +6.5V to +65V input, delivers up to 150mA, consumes only 58–140μA quiescent current, and withstands –60V reverse-battery voltage. Designed for automotive ignition-supplied systems, it enables self-holding operation via HOLD input without external components.

For engineers reviewing the MAX5024LASA+T datasheet, MAX5024LASA+T pinout, MAX5024LASA+T application, or MAX5024LASA+T equivalent, key selection criteria include its –60V reverse-battery protection, 150mA guaranteed output under +125°C ambient, active-low open-drain RESET with 4.625V threshold (–7.5% of 5V), HOLD/EN control architecture, and SO-EP thermal performance (θ_JA = 41°C/W).

Technical Context

The MAX5024LASA+T implements a BiCMOS linear regulator with internal bandgap reference and precision feedback comparator for reset generation. Its RESET circuit monitors V_OUT against a trimmed 4.625V threshold (–7.5% of nominal 5V) and asserts for 140–260ms after recovery. The HOLD input latches EN state via an internal 4µA pullup to OUT, enabling ignition-driven self-holding behavior in automotive start-stop systems.

Unlike the MAX5023, this variant omits WDI and integrates SET logic that selects fixed +5V output when grounded - confirmed by Selector Guide entry MAX5024L and Electrical Characteristics table (V_TH = 4.625V, V_OUT = 4.8–5.2V). Thermal shutdown activates at +150°C with +20°C hysteresis, and short-circuit protection sustains continuous operation at V_IN ≤ +14V.

Key Specifications

Pinout & Package

MAX5024LASA+T uses an 8-pin SO-EP (Small Outline-Exposed Pad) package with thermally enhanced copper pad soldered to PCB ground plane. The exposed pad (EP) is electrically connected to GND and critical for achieving θ_JA = 41°C/W and 1.538W max power dissipation at +70°C ambient.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX5024LASA+T, MAX5024MASA+T offers earlier reset assertion for tighter supply monitoring, while TPS7B8750QKVURQ1 provides AEC-Q100 qualification but lacks integrated HOLD and RESET - increasing design complexity and component count.

Availability

MAX5024LASA+T is available at Aetrix Electronics and suitable for automotive ECU power supplies, body control modules, fire alarm panels, and industrial PLC I/O modules requiring stable component supply across extended temperature and voltage ranges.

Supply support for MAX5024LASA+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 MAX5024 family delivers high-voltage linear regulation with integrated supervisory functions specifically for automotive and industrial systems needing robust, single-chip power and reset solutions.

FAQ

What is the exact reset threshold voltage for MAX5024LASA+T?

The MAX5024LASA+T has a guaranteed reset threshold of 4.625V (–7.5% of nominal 5V output), with min/max limits of 4.50V to 4.75V over temperature. This value is factory-trimmed and specified in the Electrical Characteristics table under "Reset Threshold" for MAX5024L devices. The MAX5024LASA+T uses this exact threshold to ensure reliable microprocessor reset during brownout conditions.

Does MAX5024LASA+T support adjustable output voltage?

No, MAX5024LASA+T is configured for fixed +5V output only. Its SET pin is internally connected to ground per the Selector Guide designation "L", enabling preset mode. While the MAX5024 family supports adjustable outputs (2.5V–11V) via external resistor dividers on the SET pin, that functionality is disabled in the MAX5024LASA+T variant - confirmed by its guaranteed V_OUT = 4.8–5.2V and absence of adjustable-mode test conditions in the datasheet.

How does the HOLD function work in MAX5024LASA+T?

In MAX5024LASA+T, the HOLD input implements a self-holding circuit: after EN is pulled high to enable the regulator, pulling HOLD low latches the ON state so the regulator remains active even if EN returns low. To shut down, release HOLD (let it float or connect to OUT) while EN is low. This behavior is enabled by an internal 4µA current source connecting HOLD to OUT, eliminating need for external latch components - a key feature for automotive ignition-switched systems.

What thermal performance can be expected from MAX5024LASA+T in a standard PCB layout?

With the exposed pad (EP) soldered to ≥1 in² of PCB copper ground plane, MAX5024LASA+T achieves θ_JA = 41°C/W and dissipates up to 1.538W at +70°C ambient. Derating is 19.2mW/°C above +70°C, yielding 1.057W at +95°C ambient. This enables 117mA continuous output at +14V input and +5V output in typical automotive under-hood layouts - verified in Example 1 of the datasheet.

Is MAX5024LASA+T qualified for automotive applications?

Yes, MAX5024LASA+T is rated for the full automotive temperature range (–40°C to +125°C) and features –60V reverse-battery protection, thermal shutdown, and load-dump tolerant input - all critical for automotive use. Though not explicitly marked "/V" in its part number, its specifications and packaging (SO-EP) align with AEC-Q100 stress test requirements for Grade 1 operation, and it appears in Maxim's automotive applications list alongside /V variants.