Analog Devices Inc./Maxim Integrated MAX17270ENE+T

Overview

MAX17270ENE+T from Maxim Integrated is a nanopower triple-output SIMO (Single-Inductor Multiple-Output) buck-boost regulator designed for space-constrained wearable electronics. It delivers three independently configurable outputs (1.2V/80mA, 1.8V/75mA, 3.3V/50mA) using one 2.2µH inductor, supports 2.7V–5.5V input, achieves up to 85% efficiency, and draws only 1.3µA quiescent current with all outputs enabled.

For engineers reviewing the MAX17270ENE+T datasheet, MAX17270ENE+T pinout, MAX17270ENE+T application, or MAX17270ENE+T equivalent, key selection considerations include its ultra-low supply current, flexible output voltage programming via RSEL resistors, WLP/TQFN package options, buck-boost topology enabling V_OUT > V_IN, < V_IN, or = V_IN, and suitability for battery-powered IoT and health-monitoring devices requiring minimal board area.

Technical Context

The MAX17270ENE+T implements a proprietary time-interleaved SIMO control scheme that dynamically allocates switching cycles among three outputs based on real-time load demand, ensuring timely regulation without fixed time slots. Its buck-boost architecture uses synchronous rectification with integrated high- and low-side FETs on LXA and LXB paths, supporting continuous conduction mode across full input range.

Each output features programmable peak inductor current limiting (via external RSEL resistors), soft-start with 1.2 mV/µs ramp rate, and automatic ultra-low-power mode (ULPM) activation under light loads-biasing output voltage +2.5% to minimize transient undershoot. The device includes thermal shutdown at 165°C and overload protection with internal clamping diodes on LXA/LXB.

Key Specifications

Pinout & Package

MAX17270ENE+T is available in a 16-pin TQFN package (3mm × 3mm × 0.75mm) and a 16-bump WLP (1.77mm × 1.77mm × 0.50mm, 0.4mm pitch). This entry corresponds to the TQFN variant (package code T1633+5).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX17270ENE+T, MAX17271ENE+T adds programmability and system control at the cost of pin count and external component simplicity, while TPS65276PWR offers lower design complexity but sacrifices input voltage range, efficiency at low V_IN, and output configurability.

Availability

MAX17270ENE+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 MAX17270ENE+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 demanding industrial, medical, and consumer applications.

The MAX17270/MAX17271 product line targets ultra-low-power wearable and IoT devices, delivering high-efficiency multi-rail power conversion in the smallest possible footprint using SIMO architecture.

FAQ

What is the primary function of the MAX17270ENE+T in a wearable power system?

The MAX17270ENE+T serves as a nanopower triple-output SIMO buck-boost regulator, generating three independent, programmable DC rails (e.g., 1.2V, 1.8V, 3.3V) from a single 2.7V–5.5V input using one 2.2µH inductor. Its 1.3µA quiescent current and compact TQFN/WLP packaging make it ideal for extending battery life and minimizing PCB area in wearables like fitness bands and hearables.

How are output voltages configured on the MAX17270ENE+T?

Output voltages on the MAX17270ENE+T are set using external precision resistors connected from RSEL1/RSEL2/RSEL3 pins to GND. Each resistor value corresponds to a specific output voltage and peak current limit per the manufacturer's RSEL selection table (e.g., 34kΩ on RSEL1 configures OUT1 to 1.1V with 0.6A limit). Resistors must be ±1% tolerance for guaranteed accuracy.

Does the MAX17270ENE+T support input voltages above the output voltage levels?

Yes-the MAX17270ENE+T uses a true buck-boost topology, enabling each output to be regulated at voltages above, below, or equal to the input. For example, it can generate 3.3V from a 2.7V Li-ion cell (boost mode) or 1.2V from a 4.2V cell (buck mode), making it uniquely suited for full-battery-range operation without external LDOs or multiple converters.

What protection features does the MAX17270ENE+T include?

The MAX17270ENE+T integrates soft-start (1.2 mV/µs slew rate), thermal shutdown (165°C trip, 150°C hysteresis), overload protection, and internal clamping diodes on LXA/LXB nodes. It also features UVLO (2.55V rising) and OVLO (5.7V rising) on VPWR, plus ±2% output voltage accuracy and 0.5% load regulation-ensuring robust operation across temperature and load variations.

Can the MAX17270ENE+T be used in place of the MAX17271ENE+T?

No-MAX17270ENE+T and MAX17271ENE+T are functionally distinct variants. The MAX17270ENE+T uses resistor-based RSEL programming and three dedicated EN inputs, while the MAX17271ENE+T replaces those with an I²C interface, ON push-button input, IRQB interrupt, and RSTB power-good output. They are not pin-compatible or drop-in replacements; PCB layout and firmware must differ.