Analog Devices Inc./Maxim Integrated MAX14720BEWA+T

Overview

MAX14720BEWA+T from Analog Devices is a highly integrated, micro-IQ power-management IC designed as the primary PMIC for ultra-low-power, battery-operated wearable and portable medical devices. It integrates a 250mW buck-boost regulator (2.5V–5V output), a 200mA synchronous buck regulator (1.0V–2.0V), a 100mA LDO (0.9V–4.0V), a 200mA load switch with battery monitoring, and a programmable power sequencer with button control - all in a 2.26mm × 2.14mm WLP package.

For engineers reviewing the MAX14720BEWA+T datasheet, MAX14720BEWA+T pinout, MAX14720BEWA+T application, or MAX14720BEWA+T equivalent, this page delivers verified technical context, real-world sequencing behavior, battery-seal mode current (120nA), I²C-controlled regulation, and validated alternative options for space-constrained medical wearables requiring multi-rail power control with zero-power shipping mode.

Technical Context

The MAX14720BEWA+T implements a configurable power-on sequence with four programmable timing points relative to POR and RST release, supporting voltage sequencing across its buck-boost, buck, LDO, and switch outputs. Its burst-mode switching regulators achieve sub-1µA quiescent current under light load, while the integrated battery impedance measurement circuitry requires SWIN tied to VCC and uses controlled open-circuit voltage sampling during switch-off.

Unlike the companion MAX14750, the MAX14720BEWA+T embeds a dedicated push-button monitor (KIN/KOUT) and programmable power controller enabling true off-state operation, delayed reset (72–88ms), and ultra-low-leakage seal mode (<1µA system disconnect). All regulators support active/passive discharge, UVLO configuration per rail (BIN/LIN), and I²C register access for dynamic reconfiguration.

Key Specifications

Pinout & Package

Package: 25-bump wafer-level package (WLP), 0.4mm pitch, 2.26mm × 2.14mm footprint, −40°C to +85°C operating range.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX14750BEWA+T and TPS65218D0RSLR, the MAX14720BEWA+T uniquely delivers sub-1µA system disconnect, integrated button monitoring, and battery impedance measurement in the smallest available footprint - making it irreplaceable for CE-certified, disposable-grade wearable medical devices where size, shelf life, and regulatory traceability are non-negotiable.

Availability

MAX14720BEWA+T is available at Aetrix Electronics and suitable for wearable medical devices, portable diagnostic tools, and battery-powered fitness trackers requiring stable component supply, long-term lifecycle support, and RoHS-compliant wafer-level packaging.

Supply support for MAX14720BEWA+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 product line, engineered specifically for ultra-low-power, size-constrained medical and consumer wearables requiring multi-rail sequencing, battery longevity optimization, and regulatory-ready power architecture.

FAQ

What is the maximum output current capability of the buck-boost regulator in MAX14720BEWA+T?

The MAX14720BEWA+T buck-boost regulator delivers up to 250mW of output power - not a fixed current value. At 2.5V output, this corresponds to 100mA; at 5.0V, it supports 50mA. The actual current depends on input voltage, output voltage, and efficiency. The device includes programmable current limiting and thermal shutdown (150°C) to protect against overload conditions during transient events.

Does MAX14720BEWA+T support true hardware reset assertion during power-on and fault recovery?

Yes. The MAX14720BEWA+T asserts an active-low, open-drain RST signal with a programmable delay of 72–88ms after power-on. During fault recovery (e.g., UVLO or thermal shutdown), RST is actively driven low until all regulated rails stabilize and sequencing completes. This ensures deterministic reset timing for connected MCUs without requiring external reset supervisors.

How does the battery seal mode in MAX14720BEWA+T achieve 120nA current draw?

The MAX14720BEWA+T achieves 120nA seal mode current by disabling all regulators and switches, powering down internal logic except the KIN button monitor circuit, and disconnecting the battery from all system loads via its integrated 200mA load switch. No external components are needed - the 120nA figure includes only the internal leakage of the disabled blocks and the active button monitor.

Can MAX14720BEWA+T perform battery impedance measurement with a non-removable rechargeable battery?

No. Battery impedance measurement in MAX14720BEWA+T requires BatZUVLO enabled and SWIN tied directly to VCC (not the battery), with no capacitor on the battery side. This architecture assumes the battery is removable and charged externally - consistent with its target use in non-rechargeable coin-cell or dual-alkaline systems. For integrated rechargeable designs, MAX14750BEWA+T or other alternatives must be evaluated.

What are the I²C voltage level requirements for MAX14720BEWA+T SDA/SCL pins in seal mode?

In seal mode, the MAX14720BEWA+T SDA and SCL pins require VIH_SEAL ≥ 4.1V (if VCC ≥ 2.7V) or ≥2.2V (if VCC < 2.7V) to recognize a logic-high, and VIL_SEAL ≤ 0.5V for logic-low. These elevated thresholds prevent spurious wake-up from noise or floating lines. Standard 1.8V/3.3V I²C signals will not activate the interface in seal mode - only a deliberate high-voltage wake command triggers exit.