Analog Devices Inc./Maxim Integrated MAX17227JATA+

Overview

The MAX17227JATA+ from Analog Devices is a nanoPower synchronous boost converter designed for ultra-low-power battery systems. It delivers up to 500mA peak inductor current, operates from 400mV to 5.5V input, regulates output from 2.3V to 5.4V (via single RSEL resistor), and achieves 350nA quiescent supply current - enabling multi-year operation in coin-cell–powered IoT sensors and wearable medical devices.

For engineers reviewing the MAX17227JATA+ datasheet, MAX17227JATA+ pinout, MAX17227JATA+ application, or MAX17227JATA+ equivalent, this device supports critical low-power design requirements including automatic pass-through mode, True Shutdown™ with zero reverse leakage, active discharge, and adaptive PFM control across ultra-low-, low-, and high-power operating modes.

Technical Context

The MAX17227JATA+ implements an adaptive on-time pulse-frequency-modulation (PFM) control scheme that dynamically transitions between ultra-low-power mode (ULPM), low-power mode (LPM), and high-power mode (HPM) based on load current - maintaining ≥89% efficiency from 500μA to 300mA output. Its cycle-by-cycle inductor current limit (500mA) and integrated high- and low-side FETs (R_DS(on) = 170mΩ / 80mΩ) enable robust regulation without external current-sense components.

True Shutdown™ disconnects OUT from IN with <100nA shutdown current and activates a 225–900Ω active discharge path to rapidly deplete output capacitance. The device supports automatic pass-through when V_IN > V_OUT + 0.4V, using a dedicated 400–650mΩ pass-through switch rated for 1A continuous input current and protected against short-circuit and thermal faults even in shutdown.

Key Specifications

Pinout & Package

The MAX17227JATA+ is packaged in a 2mm × 2mm, 8-pin TDFN (Package Code T822+3C) with exposed pad. Pin functions are electrically identical to the WLP variant but mapped to larger pitch for manufacturability and thermal performance (θ_JA = 85.3°C/W on 4-layer board).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar nanoPower boost converter applications.

Compared with TPS61291DRVR and MAX17222GTA+, the MAX17227JATA+ uniquely combines 350nA quiescent current, 500mA peak capability, single-resistor programmability, automatic pass-through, and active discharge - making it optimal for battery-powered systems demanding both longevity and dynamic input/output behavior.

Availability

The MAX17227JATA+ is available at Aetrix Electronics and suitable for clinical instrumentation, emergency lighting backup systems, and wearable health monitors requiring stable component supply across long production lifecycles and temperature extremes.

Supply support for MAX17227JATA+ 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

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision, industrial, automotive, and healthcare markets.

The MAX17227JATA+ belongs to Analog Devices' nanoPower boost converter product line, engineered specifically for energy-constrained battery-operated systems where multi-year runtime, ultra-wide input range, and intelligent power-path management are essential.

FAQ

What is the minimum input voltage required for the MAX17227JATA+ to start up?

The MAX17227JATA+ starts up from as low as 880mV input voltage into a 3kΩ or higher load resistance. This enables reliable operation with nearly depleted primary cells or low-voltage energy harvesters. Below 880mV, the device remains inactive; once VIN exceeds 880mV, it initiates soft-start and begins charging the output capacitor. The MAX17227JATA+ will not deliver full output current until VIN rises further - typically above 1.2V for 3.3V output - but startup sequencing is guaranteed at 880mV.

How does the MAX17227JATA+ implement True Shutdown™, and what happens to the output capacitor?

When the EN pin is pulled low, the MAX17227JATA+ enters True Shutdown™ mode: the internal high- and low-side FETs turn off, disconnecting OUT from IN with <100nA leakage, and the active discharge circuit engages - connecting the output capacitor to ground through an internal 225–900Ω resistor. This safely discharges V_OUT within milliseconds, preventing unintended wake-up of downstream circuitry. The MAX17227JATA+ maintains this state until EN is reasserted, with full short-circuit and thermal protection remaining active.

Can the MAX17227JATA+ operate in automatic pass-through mode, and under what conditions?

Yes - the MAX17227JATA+ automatically enters pass-through mode when the input voltage exceeds the programmed output voltage by approximately 0.4V. In this mode, the device disables switching and connects IN directly to OUT via a dedicated low-R_DS(on) (400–650mΩ) pass-through switch, minimizing conduction loss. The MAX17227JATA+ continues to monitor for overcurrent (1A limit) and overtemperature faults even in pass-through, ensuring safe operation during input voltage transients or heavy loads.

How is the output voltage programmed on the MAX17227JATA+, and what resistor values are supported?

The MAX17227JATA+ uses a single resistor from the RSEL pin to GND to set output voltage in 100mV increments from 2.3V to 5.4V. Table 1 in the datasheet specifies standard 1% resistor values - e.g., 191kΩ for 3.3V, 4.99kΩ for 5.4V. The MAX17227JATA+ samples RSEL for ~600μs at startup, drawing only 200μA during detection. Total capacitance on RSEL must remain below 2pF to ensure accurate reading; layout guidelines recommend short traces and no nearby vias or planes.

What protection features are integrated into the MAX17227JATA+, and are they active during shutdown?

The MAX17227JATA+ integrates short-circuit protection, thermal shutdown (165°C trip, 150°C release), cycle-by-cycle inductor current limiting (500mA), and overtemperature monitoring - all active whether the device is enabled or in True Shutdown™. Even with EN low, the MAX17227JATA+ continuously monitors LX, IN, and die temperature, disabling the pass-through switch or blocking discharge if faults occur. This ensures system-level safety across all operational states without requiring external supervision circuitry.