Analog Devices Inc./Maxim Integrated MAX20343JEWE+T

Overview

The MAX20343JEWE+T from Analog Devices is an ultra-low quiescent current (3.5µA typ), non-inverting buck-boost DC-DC regulator delivering up to 3.5W output power with seamless mode transitions, 1.9V startup voltage, and 2.5V–5.5V programmable output voltage - designed for optical biometric sensor power rails requiring minimal noise and maximum energy extraction from supercapacitors or low-voltage batteries.

For engineers reviewing the MAX20343JEWE+T datasheet, MAX20343JEWE+T pinout, MAX20343JEWE+T application, or MAX20343JEWE+T equivalent, this device is selected for ultra-low-power PPG systems, LPWAN radio supplies, and industrial sensor nodes where sub-2V input operation, <±2.4% output accuracy, and I²C-configurable dynamic voltage scaling (DVS) are critical design requirements.

Technical Context

The MAX20343JEWE+T implements a proprietary multi-mode control architecture that dynamically shifts between buck, buck-boost, and boost phases without discontinuities-eliminating subharmonics and minimizing output ripple across the full 1.9V–5.5V input range. Its valley/zero-current detection (IVALLEY/IZERO) and adaptive peak current limiting (IPEAK) enable stable regulation down to 500mV input while maintaining fast transient response.

It supports two configuration modes: I²C-controlled (with SDA/SCL/INT pins) or single-pin-enabled (RSEL/EN/PGOOD), both implemented in the same 12-pin FC2QFN package. The integrator loop can be enabled for full 3.5W capability or disabled to prioritize faster load settling at ≤1.75W - a hardware-selectable trade-off confirmed in electrical characteristics tables.

Key Specifications

Pinout & Package

The MAX20343JEWE+T is supplied in a 12-pin, 2.50mm × 2.50mm, 0.5mm pitch Flip-Chip QFN (FC2QFN) package with exposed thermal pad (Package Code F122B2F+1). Pin functions are identical for I²C- and single-pin-enabled variants, differing only in pin assignment of INT/PGOOD/INGOOD/EN.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar buck-boost regulator applications.

Compared with TPS63802DLAR and LTC3536EDHC#PBF, the MAX20343JEWE+T uniquely combines 3.5µA IQ, 1.9V startup, I²C-configurable DVS, and seamless mode transitions - making it the only option capable of sustaining >10-year runtime in PPG wearables while enabling real-time LED power optimization.

Availability

The MAX20343JEWE+T is available at Aetrix Electronics and suitable for photoplethysmography (PPG) sensor modules, LPWAN radio power supplies, and industrial temperature sensor nodes requiring stable component supply, long-lifecycle support, and guaranteed -40°C to +85°C operation.

Supply support for MAX20343JEWE+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 (DSP) technologies, headquartered in Wilmington, MA.

The MAX20343JEWE+T belongs to the MAX20343/MAX20344 family of ultra-low-noise, ultra-low-IQ buck-boost regulators engineered specifically for energy-constrained optical sensing and LPWAN edge devices where every microamp and millivolt of headroom matters.

FAQ

What is the minimum input voltage required for the MAX20343JEWE+T to start up?

The MAX20343JEWE+T requires a minimum input voltage of 1.9V to initiate startup, as specified in the Absolute Maximum Ratings table. This enables operation from deeply discharged supercapacitors or primary batteries. Below 1.9V, the device remains in undervoltage lockout (UVLO) until VIN rises above the rising threshold of 2.185V (for VOUT >3.3V configurations). The MAX20343JEWE+T maintains regulation down to 500mV input once started - a key differentiator for energy harvesting applications.

Does the MAX20343JEWE+T support dynamic voltage scaling (DVS), and how is it implemented?

Yes, the MAX20343JEWE+T fully supports Dynamic Voltage Scaling (DVS) via its I²C interface. DVS allows real-time adjustment of the output voltage during operation - for example, lowering VOUT during LED off-time in PPG systems to reduce average power consumption. The MAX20343JEWE+T's register map includes dedicated VOUT_SET bits (Register 0x01), and DVS transitions occur within microseconds without output disruption due to its seamless multi-mode architecture.

What package type and pin count does the MAX20343JEWE+T use?

The MAX20343JEWE+T is packaged in a 12-pin, 2.50mm × 2.50mm, 0.5mm pitch Flip-Chip QFN (FC2QFN) with exposed thermal pad (Package Code F122B2F+1). It is not offered in the 16-bump WLP variant. This FC2QFN package provides superior thermal performance (θJA = 58.7°C/W on 4-layer board) and robust manufacturability for high-volume consumer and industrial applications.

Can the MAX20343JEWE+T operate without an I²C controller?

Yes, the MAX20343JEWE+T supports single-pin-enabled operation using the RSEL pin for fixed output voltage selection and EN pin for on/off control - eliminating the need for I²C firmware. In this mode, VOUT is set by an external resistor to GND per Table 1, and status is reported via open-drain PGOOD. The MAX20343JEWE+T's factory configuration determines whether Pin 11 functions as FAST or RSEL, as defined in Table 3 of the datasheet.

What is the output voltage accuracy specification for the MAX20343JEWE+T over temperature and load?

The MAX20343JEWE+T guarantees ±2.4% output voltage accuracy over full load (1mA–700mA), temperature (-40°C to +85°C), and line (VIN = 2.7V–5.5V) conditions, as stated in the Electrical Characteristics table under ACC_OUT. This accuracy is achieved with internal trimming and applies to all programmable VOUT settings from 2.5V to 5.5V in 50mV steps - ensuring reliable biasing for precision analog circuits like transimpedance amplifiers in optical sensors.