Analog Devices Inc./Maxim Integrated MAX5087BATE+

Overview

The MAX5087BATE+ 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+ datasheet, MAX5087BATE+ pinout, MAX5087BATE+ application, or MAX5087BATE+ equivalent, key selection criteria include guaranteed 400mA load capability at 5V, 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+ implements a BiCMOS-based linear regulation architecture with an internal 1.235V reference and error amplifier driving a high-side pass transistor. Its reset circuit shares the same reference and asserts RESET low when VOUT falls below 92% of nominal output (4.6V), with timeout programmable via external capacitor on CT.

Enable logic accepts 0.4V/2.4V thresholds for shutdown/active states, supporting direct connection to IN for always-on operation. Remote sensing via OUTSENSE improves load regulation accuracy for fixed-output configurations, while SET-to-GND configures the 5.0V preset mode without external components.

Key Specifications

Pinout & Package

MAX5087BATE+ uses a 16-pin thermally enhanced TQFN-EP (exposed paddle) package, optimized for 2.6W dissipation at +70°C ambient. The exposed paddle must be soldered to a large PCB ground plane for effective thermal management.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM2940T-5.0/NOPB, MAX5087BATE+ offers 70x lower quiescent current and integrated reset supervision; versus TPS7B8750QKVURQ1, it provides user-adjustable reset delay via CT but lacks watchdog functionality-making MAX5087BATE+ optimal for cost-sensitive automotive and industrial applications needing configurable brownout recovery.

Availability

MAX5087BATE+ is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLCs, home security panels, and networking equipment management rails requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX5087BATE+ 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 MAX5087BATE+ belongs to Maxim's high-voltage linear regulator product line, engineered for robust operation in harsh environments where wide-input, low-IQ, and integrated system supervision are essential.

FAQ

What is the guaranteed output voltage tolerance for MAX5087BATE+ across temperature and load?

The MAX5087BATE+ guarantees 5.0V output within ±1.3% (4.87V to 5.13V) for 6.5V ≤ VIN ≤ 25V and 5mA ≤ IOUT ≤ 400mA, and within ±1.5% (4.85V to 5.15V) for 6.5V ≤ VIN ≤ 45V and 5mA ≤ IOUT ≤ 100mA. These limits are specified over the full -40°C to +125°C operating range and confirmed by production testing-not typical-only values.

Can MAX5087BATE+ be used in adjustable-output mode, and what is the supported voltage range?

Yes, MAX5087BATE+ supports adjustable output from 2.5V to 11V using an external resistor divider between OUTSENSE, SET, and GND. The internal SET reference is 1.235V (±2.9%), and R2 should be ≤100kΩ per design guidelines. This mode disables OUTSENSE connection-leave it open-and requires recalculating feedback resistors using VOUT = 1.235V × (1 + R1/R2).

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

The reset timeout for MAX5087BATE+ is calculated as tRP = CCT × 0.6175 × 10⁶ seconds, where CCT is the capacitor value in farads. For a 200ms (0.2s) delay, solve: CCT = 0.2 / (0.6175 × 10⁶) ≈ 324nF. A standard 330nF capacitor yields ~204ms timeout. The CT pin sources a precise 2μA current, enabling accurate, temperature-stable delay setting without external timing ICs.

Does MAX5087BATE+ support remote sensing, and how must OUTSENSE be connected in fixed-output mode?

Yes, MAX5087BATE+ supports remote sensing via the OUTSENSE pin to compensate for PCB trace resistance. In fixed 5.0V mode (SET = GND), OUTSENSE must be connected directly to the OUT pin-typically at the load side-to close the feedback loop at the point-of-load. This ensures output regulation remains within ±1.3% despite up to ~200mV IR drop in power distribution paths.

What thermal protection behavior does MAX5087BATE+ exhibit during sustained overload?

Under sustained overload, MAX5087BATE+ triggers thermal shutdown at +175°C junction temperature, turning off the pass transistor. It remains latched off until junction temperature cools by 25°C (to ~+150°C), then automatically resumes regulation. This hysteresis prevents rapid on/off cycling. Continuous operation must stay below +150°C junction limit; derating begins above +70°C ambient, with 33.3mW/°C reduction beyond that point.