Analog Devices Inc./Maxim Integrated MAX5024MASA+T

Overview

MAX5024MASA+T from Maxim Integrated is a high-voltage linear regulator with integrated microprocessor reset circuit, fixed +5V output, and SET-input-based voltage configuration capability. It operates from +6.5V to +65V input, delivers up to 150mA, consumes only 58–140μA quiescent current, and withstands –60V reverse-battery voltage. It is used in automotive body control modules where stable 5V supply and robust brownout detection are required.

For engineers reviewing the MAX5024MASA+T datasheet, MAX5024MASA+T pinout, MAX5024MASA+T application, or MAX5024MASA+T equivalent, key selection criteria include its –60V reverse-battery protection, 150mA guaranteed output current at +125°C, active-low open-drain RESET with 4.25–4.50V threshold (–7.5% of 5V), HOLD-enabled self-holding functionality, and SO-EP thermal performance (θ_JA = 41°C/W).

Technical Context

The MAX5024MASA+T implements a BiCMOS linear regulator architecture with internal bandgap reference (1.248V), adjustable feedback via SET pin, and dual-mode operation: fixed +5V when SET = GND, or adjustable 2.5V–11V via external resistor divider. Its reset supervisor shares the same reference and asserts RESET low when V_OUT drops below 4.25V (–7.5% tolerance) for ≥140ms.

Control logic integrates EN (active-high enable) and HOLD (active-low latching) inputs to support ignition-controlled self-holding circuits without external components; HOLD internally pulls up to V_OUT with 4μA current. 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

MAX5024MASA+T is housed in an 8-pin SO-EP (Small Outline–Exposed Pad) package with thermally enhanced construction. The exposed pad must be soldered to PCB ground plane to achieve specified θ_JA = 41°C/W and sustain full 150mA output at elevated temperature.

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 provides higher output voltage for legacy 5V microcontrollers and sensors; compared with LM2940CT-5.0/NOPB, it adds critical automotive features - reverse-battery survival, integrated reset, and ignition-latched operation - at the cost of higher complexity and price.

Availability

MAX5024MASA+T is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, and fire alarm control panels requiring stable component supply across extended temperature and voltage ranges.

Supply support for MAX5024MASA+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 series targets high-reliability automotive and industrial power systems requiring wide-input linear regulation with integrated supervisory functions - specifically engineered for environments with severe voltage transients and thermal stress.

FAQ

What is the exact reset threshold voltage for MAX5024MASA+T?

The MAX5024MASA+T has a guaranteed reset threshold of 4.25V to 4.50V (–7.5% of nominal 5V output), with typical value 4.375V. This threshold is factory-trimmed and applies across –40°C to +125°C ambient. RESET asserts low when V_OUT falls below this level and remains asserted for 140–260ms after recovery, ensuring reliable microprocessor reset timing in brownout conditions. The MAX5024MASA+T does not support the –12.5% threshold variant.

Can MAX5024MASA+T be used in adjustable-output mode?

Yes, MAX5024MASA+T supports adjustable output mode by connecting the SET pin to a resistive divider between OUT and GND. With V_SET = 1.248V, output voltage is calculated as V_OUT = 1.248V × (1 + R1/R2), enabling 2.5V–11V range. However, the "M" suffix denotes factory-configured +5V fixed mode - using SET for adjustment is fully functional but requires external resistors and forfeits the precision of the trimmed 5V option. The MAX5024MASA+T datasheet confirms this dual-mode capability.

What is the maximum continuous output current for MAX5024MASA+T at +105°C ambient?

At +105°C ambient, MAX5024MASA+T's allowable power dissipation is 1.538W – (0.01923W/°C × (105°C – 70°C)) = 1.538W – 0.673W = 0.865W. With V_IN = +14V and V_OUT = +5V, ΔV = 9V, so maximum continuous output current is 0.865W ÷ 9V ≈ 96mA. This is below the 150mA absolute limit, confirming thermal design governs current capability at elevated temperature. The MAX5024MASA+T datasheet Figure 6 validates this derating curve.

How does the HOLD function work in MAX5024MASA+T, and what happens if HOLD is left floating?

In MAX5024MASA+T, HOLD is an active-low latching input: pulling HOLD low after enabling EN forces the regulator to remain ON even if EN returns low. Releasing HOLD (by disconnecting or pulling high) shuts down the device. If HOLD is left floating, its internal 4μA current source pulls it to V_OUT, effectively holding it high - resulting in standard EN-controlled operation without latching. The MAX5024MASA+T truth table (Table 1) explicitly defines this behavior, and the pin description confirms HOLD floats to V_OUT when unused.

Does MAX5024MASA+T include watchdog timer functionality like MAX5023?

No, MAX5024MASA+T does not include watchdog timer functionality. The WDI (Watchdog Input) pin is absent in MAX5024 devices; only MAX5023 variants feature the 1.6s watchdog timeout that asserts RESET if WDI is not toggled. MAX5024MASA+T replaces WDI with the SET pin for output voltage configuration. This functional distinction is clearly defined in the Pin Configurations diagram and Functional Diagram - MAX5024MASA+T uses pin 7 for SET, while MAX5023 uses it for WDI. The MAX5024MASA+T datasheet omits all watchdog-related electrical characteristics and timing diagrams.