Analog Devices Inc./Maxim Integrated MAX5087AATE+T

Overview

The MAX5087AATE+T from Maxim Integrated is a high-voltage linear regulator delivering up to 400mA output current with 70μA quiescent supply current and a fixed 3.3V output voltage, operating from 6.5V to 45V input across -40°C to +125°C for automotive and industrial power rails.

For engineers reviewing the MAX5087AATE+T datasheet, MAX5087AATE+T pinout, MAX5087AATE+T application, or MAX5087AATE+T equivalent, key selection criteria include guaranteed 400mA load capability at high VIN, remote sense support, integrated open-drain μP reset with programmable timeout, thermal shutdown, and TQFN-EP package thermal performance (2.6W @ TA = +70°C).

Technical Context

This device implements a BiCMOS-based linear regulation architecture with internal 1.235V reference and error amplifier feedback loop. It supports dual-mode operation: fixed 3.3V output when SET is grounded (MAX5087A), or adjustable 2.5V–11V via external resistor divider connected to SET and OUTSENSE.

The integrated supervisor circuit shares the same reference voltage as the regulator, asserting an open-drain active-low RESET signal when VOUT falls below 92% of nominal output. Reset timeout is set by a capacitor from CT to GND, with 2μA charge current enabling precise delay calculation (tRP = CCT × 0.6175 × 10⁶ s).

Key Specifications

Pinout & Package

The MAX5087AATE+T is housed in a 16-pin thermally enhanced TQFN-EP (exposed paddle) package, optimized for high-power dissipation (θJA = 30.0°C/W, θJC = 2°C/W) and requiring connection of the EP pad to a large ground plane for thermal management.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM2940T-3.3/NOPB and TPS7B8733QKVURQ1, the MAX5087AATE+T uniquely combines 45V input capability, 3.3V fixed output with remote sense, open-drain RESET with capacitor-programmable timeout, and 70μA quiescent current in a thermally efficient 16-pin TQFN - making it optimal for space-constrained, high-reliability automotive and industrial systems requiring precise power sequencing and fault monitoring.

Availability

The MAX5087AATE+T is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC I/O power supplies, home security panel core power, and networking equipment standby rails requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for MAX5087AATE+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 MAX5087AATE+T belongs to Maxim's high-voltage linear regulator product line, engineered specifically for robust, low-quiescent-current power delivery in automotive and industrial environments where wide input range, thermal resilience, and integrated supervision are essential.

FAQ

What is the guaranteed output voltage tolerance for MAX5087AATE+T over temperature and load?

The MAX5087AATE+T guarantees a 3.3V output with ±1.3% tolerance (3.208V to 3.392V) across -40°C to +125°C and 5mA to 400mA load, measured at the OUT pin with SET grounded. This specification holds for input voltages from 6.5V to 25V; at higher VIN (up to 45V), tolerance widens slightly to ±1.5% under light loads (≤100mA) due to line regulation limits.

Can MAX5087AATE+T be used in adjustable-output configurations?

No - the MAX5087AATE+T is the fixed 3.3V version (MAX5087A). While the MAX5087 family supports adjustable outputs via SET and OUTSENSE pins, the AATE+T variant is factory-configured for 3.3V and requires SET grounded. For adjustable operation, select MAX5087BATE+ (5V preset) or use the MAX5087A with external resistors only if the datasheet's Dual Mode™ configuration is explicitly supported for the A variant - which it is not; the A/B suffix defines fixed output voltage.

How is the reset timeout period calculated for MAX5087AATE+T?

The reset timeout period (tRP) for MAX5087AATE+T is calculated using tRP = CCT × 0.6175 × 10⁶ seconds, where CCT is the capacitance (in farads) connected from the CT pin to GND. For example, a 100nF capacitor yields tRP ≈ 61.75ms. The internal 2μA CT charge current is trimmed and stable across temperature, enabling predictable reset hold times without external timing components beyond the capacitor.

What thermal derating applies to MAX5087AATE+T at elevated ambient temperatures?

MAX5087AATE+T has a continuous power dissipation limit of 2.666W at TA = +70°C, derating linearly at 33.3mW/°C above +70°C. At +95°C ambient, allowable dissipation drops to 1.834W; at +125°C, it falls to 0.835W. Since PD = (VIN – 3.3V) × IOUT, maximum deliverable current decreases with rising TA and VIN - e.g., at VIN = 14V and TA = +95°C, IOUT(max) ≈ 203mA, well below the 400mA absolute limit.

Does MAX5087AATE+T support remote voltage sensing, and how is it implemented?

Yes - MAX5087AATE+T supports remote sensing via the OUTSENSE pin. For fixed 3.3V operation, OUTSENSE must be connected directly to the OUT pin to compensate for PCB trace IR drop. This ensures the internal error amplifier regulates voltage precisely at the load, not at the IC's output pad. Leaving OUTSENSE open disables remote sensing and is only valid for adjustable-output variants, not the MAX5087AATE+T.