Analog Devices Inc./Maxim Integrated MAX15027ATB+T

Overview

MAX15027ATB+T from Maxim Integrated is a 1A, low-dropout linear regulator with p-channel MOSFET pass device, operating from 1.425V to 3.6V input and delivering adjustable output from 0.5V to VIN with ±2% accuracy over –40°C to +125°C. It features 75mV typical dropout at 1A, 275µA typical quiescent ground current, and AEC-Q100 qualification for automotive dead-man LDO applications.

For engineers reviewing the MAX15027ATB+T datasheet, MAX15027ATB+T pinout, MAX15027ATB+T application, or MAX15027ATB+T equivalent, key selection criteria include dropout voltage at full load, thermal performance in 3mm × 3mm TDFN-EP, BIAS-independent operation, soft-start timing control via external capacitor, and guaranteed short-circuit/thermal protection across automotive temperature range.

Technical Context

The MAX15027ATB+T uses an internal p-channel MOSFET pass transistor (75mΩ typ) eliminating base-drive current, enabling stable operation down to 1.425V input without sacrificing transient response. Its error amplifier integrates soft-start control via SS pin with 5µA charging current and 0.499V reference, allowing programmable ramp time using external capacitor.

Unlike BIAS-dependent MAX15028, MAX15027ATB+T derives all internal bias from IN, supporting single-supply operation with undervoltage lockout (1.275V–1.375V) and shutdown current <5.5µA. Protection includes foldback current limiting (1.4A–2.0A), thermal shutdown at 165°C with 15°C hysteresis, and continuous short-circuit tolerance.

Key Specifications

Pinout & Package

MAX15027ATB+T is housed in a thermally enhanced 10-pin TDFN package (3mm × 3mm) with exposed pad (EP) soldered to PCB ground plane for optimal heat dissipation. The package meets AEC-Q100 Grade 0 requirements and supports reflow up to +260°C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A4700RGWR and NCP1117ST50T3G, MAX15027ATB+T uniquely combines 1A programmable output, 75mV dropout, AEC-Q100 qualification, and 3mm × 3mm TDFN packaging-making it the only option meeting simultaneous requirements for compact, high-current, automotive-grade LDO regulation.

Availability

MAX15027ATB+T is available at Aetrix Electronics and suitable for automotive dead-man LDO systems, high-density server power rails, and optical module point-of-load regulation requiring stable component supply, AEC-Q100 compliance, and thermal reliability in space-constrained designs.

Supply support for MAX15027ATB+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 automotive, industrial, and communications markets.

The MAX15027 series targets high-reliability, low-voltage LDO applications demanding AEC-Q100 qualification, minimal dropout, and thermally efficient packaging-specifically for automotive infotainment, ADAS, and always-on subsystems.

FAQ

What is the maximum dropout voltage specification for MAX15027ATB+T at 1A output current?

The MAX15027ATB+T guarantees a maximum dropout voltage of 225mV at 1A output current across –40°C to +125°C. This value is measured with VIN = 1.5V and represents the worst-case (VIN – VOUT) margin required to maintain regulation. Typical dropout is 75mV under the same conditions, enabling efficient operation near battery end-of-life voltages in automotive and portable applications.

Does MAX15027ATB+T require a BIAS supply like the MAX15028?

No, MAX15027ATB+T does not require a BIAS supply. It operates entirely from the IN pin (1.425V–3.6V), with all internal circuitry powered from that rail. In contrast, the MAX15028ATB+T requires a separate 3V–5.5V BIAS input to sustain internal functionality when IN falls to 0V. This makes MAX15027ATB+T suitable for single-supply systems where a dedicated always-on bias rail is unavailable.

What is the recommended output capacitor value for MAX15027ATB+T at full 1A load?

The datasheet specifies a minimum 4.7µF ceramic output capacitor for stable 1A operation with the MAX15027ATB+T. This value ensures adequate transient response, limiting output deviation to ≤15mV for 500mA load steps. Larger values (up to 100µF) further reduce overshoot but are not required for basic stability. The capacitor must have low ESR and be placed close to the OUT and GND pins.

How does the soft-start function work on MAX15027ATB+T, and how is it configured?

The MAX15027ATB+T implements soft-start via the SS pin, which is charged by an internal 5µA current source. A capacitor (CSS) connected from SS to GND sets the ramp time: t_SS = CSS × 10⁵ seconds. For example, a 0.1µF capacitor yields ~10ms ramp time. During startup, the feedback reference voltage (VREG) follows the rising SS voltage until it reaches the internal 0.499V reference, then locks to regulation-preventing inrush current into downstream capacitance.

Is MAX15027ATB+T qualified for automotive applications, and what is its temperature rating?

Yes, MAX15027ATB+T is AEC-Q100 qualified (Grade 0) and fully specified from –40°C to +125°C junction temperature. Its 10-pin TDFN-EP package with exposed pad, combined with thermal characteristics (θ_JA = 41°C/W, θ_JC = 9°C/W), supports reliable operation in under-hood and infotainment environments. The part is marked "+AUD" per Maxim's ordering nomenclature, confirming automotive qualification.