Analog Devices Inc./Maxim Integrated MAX14720AEWA+T

Overview

MAX14720AEWA+T from Analog Devices is a highly integrated, micro-IQ power-management IC designed as the primary PMIC for space-constrained, battery-powered systems requiring ultra-low quiescent current and multi-rail sequencing. It integrates a 250mW buck-boost regulator (2.5V–5V output), a 200mA synchronous buck regulator (1.0V–2.0V), a 100mA programmable LDO (0.9V–4.0V), a 200mA load switch with battery monitoring, and a programmable power controller with push-button sequencer - all in a 25-bump WLP package. It targets coin-cell or removable-rechargeable battery applications such as wearable medical sensors.

For engineers reviewing the MAX14720AEWA+T datasheet, MAX14720AEWA+T pinout, MAX14720AEWA+T application, or MAX14720AEWA+T equivalent, key selection criteria include its 1.1µA buck-boost IQ, 120nA battery seal mode, I²C-configurable sequencing, integrated battery impedance measurement, and 2.26mm × 2.14mm wafer-level package for ultra-thin wearables.

Technical Context

The MAX14720AEWA+T implements a dedicated power sequencer with configurable boot timing (9.9–12.1ms), delayed reset (72–88ms), and push-button monitoring to enable ultra-low-power shipping mode (<1µA system leakage). Its burst-mode switching regulators maintain high efficiency at light loads, while the programmable power controller supports true OFF state or always-on operation via register-controlled power modes.

It features an integrated monitor multiplexer (MON) supporting voltage sensing across SWIN, SWOUT, BIN, HVIN, HVOUT, LIN, LOUT, and BOUT with switch resistances of 80–500Ω, plus dual UVLO circuits (BIN and LIN) with configurable sharing via UVLOCfg register - enabling optimized quiescent current management in single-supply or split-supply configurations.

Key Specifications

Pinout & Package

MAX14720AEWA+T is housed in a 25-bump, 0.4mm pitch, 2.26mm × 2.14mm wafer-level package (WLP) with bottom-side solder bumps. The package supports fine-pitch routing on ultra-thin flex PCBs and is RoHS-compliant (indicated by '+' suffix).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar power-management applications.

Compared with MAX14750AEWA+T, the MAX14720AEWA+T adds push-button sequencing and battery seal mode but sacrifices individual enable pin flexibility; versus TPS650361IRGZR, it delivers 4.6× lower quiescent current, integrated buck-boost, and battery diagnostics - essential for FDA-class wearable medical certification.

Availability

MAX14720AEWA+T is available at Aetrix Electronics and suitable for wearable medical sensors, portable ECG monitors, and fitness tracker core logic requiring stable component supply, long-term lifecycle support, and guaranteed traceability for regulated medical design.

Supply support for MAX14720AEWA+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

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Wilmington, MA.

The MAX14720 belongs to Analog Devices' micro-IQ power management portfolio, engineered specifically for ultra-low-power, size-constrained battery-operated medical and fitness devices demanding multi-rail sequencing, battery health monitoring, and sub-1µA standby operation.

FAQ

What is the primary function of the MAX14720AEWA+T in a wearable medical device?

The MAX14720AEWA+T serves as the central power-management IC, integrating a buck-boost regulator, buck regulator, LDO, load switch, and sequencer to deliver multiple precision rails from a single coin-cell or alkaline battery. In wearable medical devices, it enables ultra-long battery life (≥18 months standby), battery impedance measurement for health tracking, and push-button–initiated power sequencing - all within a 2.26mm × 2.14mm WLP footprint. The MAX14720AEWA+T is specifically architected for clinical-grade reliability in continuous biosensing applications.

How does the MAX14720AEWA+T achieve 120nA battery seal mode current?

The MAX14720AEWA+T achieves 120nA seal mode by disabling all internal regulators (buck-boost, buck, LDO), turning off the power switch, and placing all I/Os (including KIN, SDA, SCL) into high-impedance states with minimized leakage paths. Only the button monitor circuit remains active, drawing minimal current to detect wake-up events. This mode is entered via I²C command or hardware sequence and is validated across −40°C to +85°C. The MAX14720AEWA+T's dedicated seal-state architecture eliminates parasitic discharge paths common in general-purpose PMICs.

Can the MAX14720AEWA+T replace the MAX14750AEWA+T in an existing design?

No - the MAX14720AEWA+T and MAX14750AEWA+T are not pin-compatible or functionally interchangeable. The MAX14720AEWA+T uses KIN/KOUT for button control and lacks dedicated enable pins (BEN, SWEN, LEN, HVEN), while the MAX14750AEWA+T omits the sequencer, MPC, and seal mode. Swapping requires PCB layout changes, firmware updates for I²C register mapping, and validation of button timing and battery impedance functionality. The MAX14720AEWA+T is not a drop-in replacement for the MAX14750AEWA+T.

What is the role of the MON pin on the MAX14720AEWA+T?

The MON pin on the MAX14720AEWA+T is the output of an integrated analog multiplexer that routes voltages from up to eight internal nodes - including SWIN, SWOUT, BIN, HVIN, HVOUT, LIN, LOUT, and BOUT - for external ADC measurement or system-level monitoring. With switch resistances of 80–500Ω and configurable channel selection via I²C, it enables real-time verification of regulator health, battery voltage sag under load, and cross-rail coupling effects - all without adding external op-amps or dividers. This capability is intrinsic to the MAX14720AEWA+T's diagnostic architecture.

Does the MAX14720AEWA+T support battery impedance measurement with all battery chemistries?

The MAX14720AEWA+T battery impedance measurement feature is validated for primary (coin-cell, alkaline) and removable Li-ion batteries where SWIN is directly connected to VCC and SWOUT supplies all system loads. It requires the BatZUVLO bit enabled and operates by applying calibrated current pulses to measure voltage delta across SWOUT. While functional with NiMH or LiFePO₄, accuracy is specified only for standard coin-cell and alkaline profiles per the datasheet. The MAX14720AEWA+T does not support impedance measurement on batteries with integrated fuel gauges or protected packs.