Analog Devices Inc./Maxim Integrated MAX15027ATB/V+T

Overview

MAX15027ATB/V+T from Maxim Integrated is an AEC-Q100 qualified 1A low-dropout linear regulator with 1.425V to 3.6V input range, adjustable 0.5V–VIN output voltage, ±2% accuracy over –40°C to +125°C, and 75mV typical dropout at 1A - designed for automotive dead-man LDO applications where reliable post-ignition power retention is critical.

For engineers reviewing the MAX15027ATB/V+T datasheet, MAX15027ATB/V+T pinout, MAX15027ATB/V+T application, or MAX15027ATB/V+T equivalent, key selection considerations include its thermally enhanced 3mm × 3mm TDFN package with exposed pad, BIAS-independent operation (unlike MAX15028), shutdown current <5.5µA, and guaranteed 225mV max dropout at full load.

Technical Context

The MAX15027ATB/V+T uses a p-channel MOSFET pass transistor (75mΩ typ) enabling stable regulation down to 1.425V input without base-drive current penalty. Its internal error amplifier includes soft-start control via external SS capacitor and references a 0.499V feedback threshold with 0.1–0.2µA input bias current.

It integrates undervoltage lockout (1.275–1.375V VIN threshold), thermal shutdown at +165°C (15°C hysteresis), and short-circuit protection limiting output current to 1.4–2.0A. Unlike the MAX15028, it lacks a dedicated BIAS pin and derives all internal supply from IN.

Key Specifications

Pinout & Package

MAX15027ATB/V+T is housed in a 10-pin thermally enhanced TDFN package (3mm × 3mm) with exposed pad (EP), optimized for high-power-density automotive PCB layouts. The exposed pad must be soldered to a large ground plane using multiple thermal vias to achieve θJA = 41°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX15028ATB+T, MAX15027ATB/V+T eliminates BIAS complexity and reduces BOM count for single-supply automotive systems; versus TPS7A8300RGRT, it trades higher dropout for guaranteed automotive qualification and lower quiescent current in shutdown.

Availability

MAX15027ATB/V+T is available at Aetrix Electronics and suitable for automotive dead-man LDO, optical module biasing, and base station RF power management requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX15027ATB/V+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for demanding industrial, automotive, and communications applications.

The MAX15027/MAX15028 product line was engineered specifically for automotive and infrastructure applications requiring AEC-Q100 qualification, ultra-low shutdown current, and robust operation under low-input-voltage conditions.

FAQ

What is the maximum output current capability of the MAX15027ATB/V+T?

The MAX15027ATB/V+T delivers up to 1A of continuous output current. Its current-limit threshold is specified from 1.4A to 2.0A depending on temperature and operating conditions, ensuring safe operation under overload while maintaining regulation up to rated load. This makes MAX15027ATB/V+T suitable for powering moderate-complexity microcontrollers, interface ICs, and analog front-ends in automotive and telecom systems.

Does the MAX15027ATB/V+T require external components for stable operation?

Yes, the MAX15027ATB/V+T requires a minimum 1µF ceramic capacitor between IN and GND, and a minimum 4.7µF ceramic capacitor between OUT and GND for stable 1A operation across –40°C to +125°C. The FB pin uses an external resistor divider to set output voltage, and the SS pin requires a 0.1µF capacitor to GND for standard soft-start timing. These components are mandatory per the datasheet and cannot be omitted without risking instability or excessive output ripple.

Is the MAX15027ATB/V+T pin-compatible with the MAX15028ATB+T?

No, the MAX15027ATB/V+T is not pin-compatible with the MAX15028ATB+T. While both use the same 10-pin TDFN package, Pin 3 is unused (NC) on MAX15027ATB/V+T but functions as the BIAS input on MAX15028ATB+T. Swapping them without board revision will result in incorrect biasing and failure to regulate. Always verify pin mapping against the respective datasheet before substitution.

What does the "/V" suffix indicate in MAX15027ATB/V+T?

The "/V" suffix in MAX15027ATB/V+T denotes AEC-Q100 qualification for automotive applications. This part undergoes additional stress testing, lot traceability, and process controls to meet automotive reliability standards, including operation from –40°C to +125°C junction temperature and robustness against thermal cycling, humidity, and mechanical shock. It is intended for safety-critical vehicle subsystems where standard commercial-grade parts are insufficient.

How does the soft-start function operate in the MAX15027ATB/V+T?

The MAX15027ATB/V+T implements soft-start by charging an external capacitor (CSS) connected from SS to GND using a 5µA internal current source. As CSS voltage rises, it modulates the feedback reference, causing VOUT to ramp linearly. The soft-start time tSS (seconds) is calculated as CSS (farads) = 10⁻⁵ × tSS. This prevents inrush current spikes that could destabilize upstream supplies or trigger overcurrent protection in the host system - a critical feature for MAX15027ATB/V+T in automotive power domains.