Analog Devices Inc./Maxim Integrated MAX17271ENE+T

Overview

MAX17271ENE+T from Maxim Integrated is a nanoPower triple-output SIMO (Single-Inductor Multiple-Output) buck-boost DC-DC regulator in a 16-pin TQFN package, delivering independently programmable 1.2V/80mA, 1.8V/75mA, and 3.3V/50mA outputs from a 2.7V–5.5V input. It achieves up to 85% efficiency using one 2.2µH inductor and supports I²C configuration, push-button power control, and power-good indication - optimized for space-constrained wearable electronics.

For engineers reviewing the MAX17271ENE+T datasheet, MAX17271ENE+T pinout, MAX17271ENE+T application, or MAX17271ENE+T equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts with functional distinctions, and application-specific implementation guidance for ultra-low-power multi-rail systems.

Technical Context

The MAX17271ENE+T implements a proprietary time-interleaved SIMO control scheme that dynamically allocates switching cycles among three outputs based on real-time load demand, preventing starvation while maintaining regulation across all rails. Its I²C interface (SCL/SDA/VIO) enables runtime voltage reconfiguration (0.8V–5.175V per output) and peak current limit programming (0.4A–1.1A), with dedicated registers for power sequencing (ENCTL[4:0]) and active discharge control (ADE).

It integrates dual synchronous rectifiers (LXA/LXB), bootstrap circuitry (BST), and robust protection including soft-start (1.2 mV/μs ramp rate), thermal shutdown (165°C trip), overload detection, and reverse-blocking diodes. The device operates across –40°C to +85°C and supports ultra-low-power mode (ULPM) under light loads, biasing outputs +2.5% to minimize transient undershoot during sudden load steps.

Key Specifications

Pinout & Package

MAX17271ENE+T is packaged in a 3mm × 3mm × 0.75mm, 16-pin thin QFN (TQFN) with exposed thermal pad (package code T1633+5, outline 21-0136). Pin pitch is 0.5mm; land pattern follows JEDEC MO-220, recommended footprint number 90-0032.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar triple-output SIMO buck-boost regulator applications.

Compared with MAX17270ENE+T, the MAX17271ENE+T adds I²C configurability, push-button control, and wider output range (to 5.175V), enabling dynamic power management in firmware-upgradable wearables; versus TPS65276VQD, it supports true buck-boost operation down to 2.7V and delivers 4× lower quiescent current for extended battery runtime.

Availability

MAX17271ENE+T is available at Aetrix Electronics and suitable for Bluetooth headsets, fitness bands, and smart watches requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX17271ENE+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 applications.

The MAX17270/MAX17271 product line was designed specifically for ultra-low-power, space-constrained wearable electronics - delivering multi-rail regulation from a single inductor while minimizing quiescent current and solution footprint.

FAQ

What is the maximum output current supported by each rail of the MAX17271ENE+T?

The MAX17271ENE+T supports programmable peak inductor current limits per output: OUT1 up to 1.1A, OUT2 up to 0.8A, and OUT3 up to 0.4A - configurable via I²C register ILIM[1:0]. Actual continuous output current depends on input voltage, output voltage, and thermal conditions; typical ratings are 80mA at 1.2V, 75mA at 1.8V, and 50mA at 3.3V under standard conditions.

Does the MAX17271ENE+T support true buck-boost operation across the full input range?

Yes, the MAX17271ENE+T supports true buck-boost operation from 2.7V to 5.5V input, enabling regulation of outputs both above (e.g., 3.3V from 2.8V battery) and below (e.g., 1.2V from 4.2V battery) the input voltage. This eliminates the need for separate buck and boost converters in single-cell Li-ion wearable systems.

How does the ultra-low-power mode (ULPM) function in the MAX17271ENE+T?

In ULPM, the MAX17271ENE+T automatically reduces switching frequency and biases each output voltage +2.5% above nominal to minimize undershoot during sudden load transients. This mode activates under light loads (<1mA per rail) and cuts total supply current to 1.3µA with all outputs enabled - extending battery life without sacrificing transient response.

Can the MAX17271ENE+T be used without an I²C host controller?

Yes - the MAX17271ENE+T can operate in standalone mode using its ON pin for push-button power control and RSTB/IRQB for basic status signaling. However, I²C is required to configure output voltages, current limits, power sequencing, and active discharge; fixed configurations are not supported like in the MAX17270 variant.

What thermal performance can be expected from the MAX17271ENE+T in a 4-layer PCB design?

In a standard 4-layer PCB with proper thermal vias to inner ground planes, the MAX17271ENE+T (TQFN package) exhibits θ_JA = 48°C/W and θ_JC = 10°C/W. At 1.3µA supply current and light loads, junction temperature rise is negligible; under full 3-rail load, thermal derating begins above +70°C ambient, with continuous power dissipation rated at 1666.7mW at TA = 70°C.