Analog Devices Inc./Maxim Integrated MAX14720DEWA+T

Overview

MAX14720DEWA+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 250mΩ on-resistance at 2.7V, and a programmable button-monitoring sequencer - all in a 2.26mm × 2.14mm wafer-level package.

For engineers reviewing the MAX14720DEWA+T datasheet, MAX14720DEWA+T pinout, MAX14720DEWA+T application, or MAX14720DEWA+T equivalent, this page delivers verified technical context, confirmed pin functions, real-world sequencing behavior, battery-seal mode operation (120nA), and validated alternative options for non-rechargeable coin-cell and dual-alkaline systems.

Technical Context

The MAX14720DEWA+T implements a configurable power-on sequencing controller with delayed reset (72–88ms), voltage sequencing across four timing points, and push-button monitoring enabling ultra-low-power shipping mode (<1µA system leakage). Its burst-mode switching regulators achieve 1.1µA (buck-boost) and 0.9µA (buck/LDO) quiescent current, while the integrated battery impedance measurement circuit requires SWIN–VCC connection and active SWOUT UVLO supervision.

Unlike the companion MAX14750, the MAX14720DEWA+T lacks direct enable pins and instead uses I²C-configurable sequencer states (e.g., _Seq[2:0] = 001 for always-on) and fault-retry logic (7 attempts before OFF mode). Its seal mode reduces input current to 120nA by disabling all blocks except KIN monitoring, and its multiplexer supports real-time monitoring of HVOUT, BOUT, LOUT, SWOUT, BIN, and LIN via MON pin.

Key Specifications

Pinout & Package

Package: 25-bump, 0.4mm pitch, 2.26mm × 2.14mm wafer-level package (WLP), RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX14750DEWA+T and TPS65218D0RSLR, the MAX14720DEWA+T uniquely combines sub-µA seal mode, integrated button sequencing, and battery impedance measurement - making it the only option qualified for long-shelf-life, single-button, coin-cell-powered medical wearables.

Availability

MAX14720DEWA+T is available at Aetrix Electronics and suitable for wearable medical devices, portable diagnostic equipment, and fitness trackers requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for MAX14720DEWA+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 MAX14720DEWA+T belongs to Analog Devices' micro-IQ power-management portfolio, engineered specifically for space-constrained, battery-powered medical and fitness wearables demanding multi-year shelf life and ultra-low-quiescent-current regulation.

FAQ

What is the primary function of the MAX14720DEWA+T in a wearable medical device?

The MAX14720DEWA+T serves as the primary power-management IC in wearable medical devices, integrating a buck-boost regulator (2.5V–5.0V), buck regulator (1.0V–2.0V), LDO (0.9V–4.0V), 200mA load switch, and programmable sequencer. Its 120nA seal mode and button-monitoring capability enable multi-year shelf life and one-button activation - essential for ECG patches and disposable diagnostics.

Does the MAX14720DEWA+T support battery impedance measurement, and how is it implemented?

Yes, the MAX14720DEWA+T supports battery impedance measurement when BatZUVLO is enabled. It requires SWIN tied to VCC (no capacitor on battery side) and uses SWOUT voltage sampling before/after applying a programmable current pulse. The measurement aborts if SWOUT falls below its 1.92V UVLO threshold, ensuring system stability during testing.

How does the MAX14720DEWA+T differ from the MAX14750DEWA+T in terms of control architecture?

The MAX14720DEWA+T uses an integrated sequencer with push-button monitoring and configurable power states (e.g., always-on, true-off), while the MAX14750DEWA+T provides individual hardware enable pins (SWEN, BEN, LEN, HVEN) and no sequencer. The MAX14720DEWA+T's boot time is 9.9–12.1ms vs. 21.6–26.4ms for MAX14750DEWA+T, reflecting its optimized startup for sealed systems.

What are the key thermal specifications for the MAX14720DEWA+T in its WLP package?

The MAX14720DEWA+T in its 2.26mm × 2.14mm WLP has a junction-to-ambient thermal resistance (θ_JA) of 52.43°C/W on a four-layer board. Its absolute maximum junction temperature is +150°C, with thermal shutdown activating at +150°C and 21°C hysteresis for all regulators and the power switch - ensuring robust operation in compact wearable enclosures.

Can the MAX14720DEWA+T operate from a single 1.8V input, and what blocks remain functional?

Yes, the MAX14720DEWA+T supports 1.8V input on VCC, BIN, LIN, HVIN, and SWIN. At 1.8V, the buck regulator delivers up to 250mA (with reduced efficiency), the LDO operates in switch mode (RON ≈ 3Ω @ 1.2V), and the power switch maintains 500mΩ max R_ON. The buck-boost regulator requires ≥1.9V startup but sustains regulation down to 1.8V input once running.