Analog Devices Inc./Maxim Integrated MAX17271ETE+T

Overview

The MAX17271ETE+T from Maxim Integrated is a nanoPower triple-output SIMO (Single-Inductor Multiple-Output) buck-boost regulator IC designed for ultra-low-power wearable electronics. It delivers three independently programmable outputs (0.8V–5.175V), operates from 2.7V–5.5V input, achieves up to 85% efficiency at 3.3V output, and draws only 1.3µA quiescent current with all outputs enabled-enabling multi-rail power in Bluetooth headsets and fitness bands.

For engineers reviewing the MAX17271ETE+T datasheet, MAX17271ETE+T pinout, MAX17271ETE+T application, or MAX17271ETE+T equivalent, key selection criteria include I²C-configurable output voltages, programmable per-channel peak current limits (0.4A–1.1A), ultra-low shutdown current (330nA), integrated power-good and interrupt signaling, and compatibility with 2.2µH single inductor solutions in space-constrained wearables.

Technical Context

The MAX17271ETE+T implements a proprietary time-interleaved SIMO control scheme that dynamically allocates switching cycles among three outputs using one shared inductor, enabling simultaneous regulation above, below, or equal to input voltage. Its I²C interface (SCL/SDA/VIO) supports full register-based configuration of output voltages, current limits, power-up sequencing, and active discharge control.

Each output features independent soft-start ramp rate (1.2mV/µs), ultra-low-power mode (ULPM) for light loads, and automatic transition between ULPM and normal mode based on load transient demand. The device integrates synchronous rectifiers, reverse-blocking FETs, and thermal/overload protection without external components beyond input/output capacitors and the single 2.2µH inductor.

Key Specifications

Pinout & Package

MAX17271ETE+T is packaged in a 3mm × 3mm × 0.75mm, 16-pin TQFN (package code T1633+5) with exposed thermal pad. Pinout optimized for minimal PCB area and high-density wearable layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX17270ETE+T and TPS65218D0RSLR, the MAX17271ETE+T uniquely combines I²C configurability, 1.3µA quiescent current, and 3mm×3mm footprint-making it the only option capable of supporting firmware-upgradable voltage rails in sub-20mm² wearable PCBs.

Availability

MAX17271ETE+T is available at Aetrix Electronics and suitable for Bluetooth headsets, fitness bands, and smart watches requiring stable component supply with guaranteed long-term availability for consumer electronics production programs.

Supply support for MAX17271ETE+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 engineered specifically for ultra-low-power, space-constrained wearable electronics-delivering multi-rail regulation with nanopower efficiency and minimal external components.

FAQ

What is the maximum output current supported by each rail of the MAX17271ETE+T?

The MAX17271ETE+T supports programmable per-rail peak inductor current limits of 0.4A, 0.6A, 0.8A, or 1.1A-set via I²C register ILIM[1:0]. Continuous output current depends on input voltage, output voltage, and thermal conditions; typical sustained output is 80mA at 1.2V, 75mA at 1.8V, and 50mA at 3.3V per rail in the reference design. The MAX17271ETE+T datasheet specifies these values under standard test conditions with 2.2µH inductor and 10µF output capacitors.

Does the MAX17271ETE+T require external resistors to set output voltages?

No, the MAX17271ETE+T does not require external resistors to set output voltages. Unlike the MAX17270ETE+T, which uses RSEL1–3 pins for resistor-based programming, the MAX17271ETE+T configures all three output voltages (0.8V–5.175V) through its I²C interface using TVSIMOx[7:0] registers. This eliminates external components and enables dynamic voltage adjustment during operation-confirmed in the MAX17271ETE+T functional description and register map.

How does the ultra-low-power mode (ULPM) function in the MAX17271ETE+T?

The MAX17271ETE+T automatically enters ultra-low-power mode (ULPM) when load current on any output falls below threshold-reducing switching frequency and biasing the output voltage 2.5% higher than nominal to minimize undershoot during sudden load steps. ULPM is fully automatic and transparent to firmware; it is documented in the MAX17271ETE+T Typical Operating Characteristics (Figure 1) and Detailed Description section, with waveforms showing voltage offset and timing behavior.

What is the purpose of the ON pin on the MAX17271ETE+T?

The ON pin on the MAX17271ETE+T serves as a hardware push-button controller input for initiating power-up and power-down sequencing. When pulled high via momentary switch, it triggers internal state machine sequencing-including controlled ramp-up of all three outputs and assertion of RSTB. Debounce time is 10ms and auto-enable delay is 102ms after reset, as specified in the MAX17271ETE+T Electrical Characteristics table under LOGIC INPUTS.

Can the MAX17271ETE+T operate with input voltages below 2.7V?

No, the MAX17271ETE+T has a guaranteed operational input voltage range of 2.7V to 5.5V. Input voltage below 2.7V triggers undervoltage lockout (UVLO) at 2.55V (rising) and 2.2V (falling), disabling regulation. This is explicitly defined in the MAX17271ETE+T Absolute Maximum Ratings and Electrical Characteristics tables, and operation outside this range may cause unpredictable behavior or damage.