Analog Devices Inc./Maxim Integrated MAX5087BATE+T

Overview

The MAX5087BATE+T from Maxim Integrated is a high-voltage linear regulator delivering a fixed 5.0V output at up to 400mA, operating from 6.5V to 45V input, with 70μA quiescent current and integrated open-drain μP reset output-used in automotive power rails and industrial control modules requiring stable low-noise 5V supply.

For engineers reviewing the MAX5087BATE+T datasheet, MAX5087BATE+T pinout, MAX5087BATE+T application, or MAX5087BATE+T equivalent, key selection criteria include guaranteed 400mA load capability, adjustable reset timeout via CT pin, remote sense (OUTSENSE) support, thermal shutdown at +175°C, and operation across -40°C to +125°C.

Technical Context

The MAX5087BATE+T implements a BiCMOS-based linear regulation architecture with internal 1.235V reference and error amplifier driving an N-channel pass transistor. Its dual-mode feedback accepts either direct ground connection at SET for fixed 5.0V output or external resistive divider for adjustable 2.5V–11V operation.

The integrated supervisor uses the same reference to monitor VOUT and assert open-drain RESET when voltage drops below 92% of nominal output; timeout is programmable via capacitor on CT pin using 2μA charge current and t_RP = C_CT × 0.6175 × 10⁶ s.

Key Specifications

Pinout & Package

MAX5087BATE+T is housed in a 16-pin thermally enhanced TQFN-EP (exposed paddle) package, measuring 4mm × 4mm × 0.8mm, with θ_JA = 30.0°C/W and θ_JC = 2°C/W. The exposed paddle must be soldered to a large PCB ground plane for optimal thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM2940S-5.0/NOPB, MAX5087BATE+T delivers 70× lower quiescent current and integrated programmable reset; versus TPS7B8750QKVURQ1, it offers lower system cost and simpler implementation where watchdog functionality is unnecessary.

Availability

MAX5087BATE+T is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC power supplies, and home security system design requiring stable component supply, extended temperature operation, and integrated reset supervision.

Supply support for MAX5087BATE+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 MAX5087 series targets high-input-voltage linear regulation in space- and thermal-constrained environments, emphasizing low IQ, integrated supervision, and robust fault protection for mission-critical embedded power rails.

FAQ

What is the guaranteed output voltage tolerance for MAX5087BATE+T under full load and temperature range?

The MAX5087BATE+T guarantees 5.0V output within ±1.3% (4.87V to 5.15V) across -40°C to +125°C ambient, 5mA to 400mA load, and 6.5V to 45V input. This specification is verified per datasheet Table "Output Voltage" with test conditions explicitly covering worst-case combinations of temperature, line, and load.

Can MAX5087BATE+T be used in adjustable-output configurations despite its 'B' suffix indicating 5.0V preset?

Yes, MAX5087BATE+T supports adjustable output from 2.5V to 11V by disconnecting SET from ground and connecting an external resistive divider between OUTSENSE, SET, and GND. The internal 1.235V reference remains accessible, enabling precise scaling per V_OUT = 1.235V × (1 + R1/R2).

How is the reset timeout period calculated for MAX5087BATE+T, and what capacitor value yields a 200ms delay?

The reset timeout is calculated as t_RP = C_CT × 0.6175 × 10⁶ seconds. For a 200ms delay, solve C_CT = 0.2 / (0.6175 × 10⁶) ≈ 324nF. A standard 330nF capacitor yields ~203ms timeout, confirmed by typical operating characteristics curves in the MAX5087BATE+T datasheet.

Does MAX5087BATE+T require an external capacitor on the OUTSENSE pin for fixed 5.0V operation?

No - for fixed 5.0V operation (MAX5087BATE+T), OUTSENSE must be directly connected to the OUT pin to enable remote sensing. Leaving OUTSENSE open disables remote sense and is reserved only for adjustable-output configurations where the feedback divider connects there instead of at OUT.

What thermal derating applies to MAX5087BATE+T above +70°C ambient, and how does it affect maximum output current at +105°C?

MAX5087BATE+T derates at 33.3mW/°C above +70°C, reducing max power dissipation from 2.666W to 1.499W at +105°C. At VIN = 14V and VOUT = 5V, this limits output current to approximately 167mA (1.499W / 9V), well below the 400mA absolute limit but constrained by thermal design.