Analog Devices Inc./Maxim Integrated MAX20343PEWE+T

Overview

The MAX20343PEWE+T from Analog Devices is an ultra-low quiescent current (3.5µA typ), non-inverting buck-boost regulator delivering up to 3.5W output power with seamless mode transitions, 1.9V startup voltage, and 2.5V–5.5V programmable output range - designed for optical biometric sensor power rails where low noise and long battery life are critical.

For engineers reviewing the MAX20343PEWE+T datasheet, MAX20343PEWE+T pinout, MAX20343PEWE+T application, or MAX20343PEWE+T equivalent, key selection criteria include its 16-bump WLP package (1.77mm × 2.01mm), I²C-controlled operation, dynamic voltage scaling (DVS) support, and ability to operate down to 500mV input while sustaining 250mW output - essential for PPG and LPWAN radio subsystems.

Technical Context

The MAX20343PEWE+T employs a proprietary control algorithm that dynamically shifts between buck, buck-boost, and boost modes without discontinuities or subharmonics in output ripple. Its valley/zero-current detection (IVALLEY/IZERO) enables precise switching-phase management across the full 1.9V–5.5V input range.

It integrates a configurable feedback integrator, FAST pin pretriggering for load transient response, and dual FET scaling (BBstFETScale = 0/1) to trade off peak output power (3.5W vs. 1.75W) against settling time - all while maintaining <±2.4% output voltage accuracy and eliminating need for post-filtering LDOs in noise-sensitive analog signal chains.

Key Specifications

Pinout & Package

The MAX20343PEWE+T is packaged in a 16-bump, 1.77mm × 2.01mm, 0.4mm pitch Wafer-Level Package (WLP) with exposed thermal pad. Pin assignments are identical for I²C-controlled variants.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX20344PEWE+T, the MAX20343PEWE+T offers identical performance at lower cost and qualification burden for commercial-temperature designs; versus TPS63802DLAR, it delivers 3.2× lower quiescent current, full output programmability, and integrated DVS - making it uniquely suited for battery-constrained optical sensing.

Availability

The MAX20343PEWE+T is available at Aetrix Electronics and suitable for photoplethysmography (PPG) modules, LPWAN radio subsystems, and industrial optical sensor nodes requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for MAX20343PEWE+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, serving industrial, automotive, communications, and healthcare markets.

The MAX20343/MAX20344 product line was engineered specifically for ultra-low-power, noise-sensitive power delivery in optical biosensing and LPWAN edge devices - prioritizing quiescent current, output ripple suppression, and energy extraction efficiency over raw output current capability.

FAQ

What is the minimum input voltage required for the MAX20343PEWE+T to start regulation?

The MAX20343PEWE+T requires a minimum input voltage of 1.9V to initiate startup and enter regulation. This low threshold enables operation from deeply discharged supercapacitors or single-cell primary batteries. Below 1.9V, the device remains in undervoltage lockout (UVLO) until VIN rises above the rising threshold of 1.836V (soft-start active) or 2.185V (soft-start complete). The MAX20343PEWE+T maintains regulation down to 500mV input once started, delivering 250mW output power.

Does the MAX20343PEWE+T support dynamic voltage scaling (DVS), and how is it implemented?

Yes, the MAX20343PEWE+T fully supports dynamic voltage scaling (DVS) via its I²C interface. DVS allows real-time adjustment of the output voltage to match instantaneous load requirements - for example, lowering VOUT during LED standby and raising it only during pulse illumination in PPG systems. This is implemented through register writes to the VOUT_SET register (address 0x01), enabling 50mV-step changes with sub-millisecond response. The MAX20343PEWE+T's seamless mode transition architecture ensures no output glitches occur during DVS transitions.

What package type and dimensions does the MAX20343PEWE+T use?

The MAX20343PEWE+T uses a 16-bump Wafer-Level Package (WLP) with dimensions of 1.77mm × 2.01mm and 0.4mm bump pitch. It features an exposed thermal pad on the bottom side for enhanced heat dissipation. This ultra-compact package is optimized for space-constrained optical modules and wearables. The part number suffix "PEWE+T" explicitly denotes this WLP variant - distinct from the FC2QFN option - and is compatible with standard reflow soldering profiles including JEDEC J-STD-020 Class 3.

Can the MAX20343PEWE+T operate without an I²C host controller?

Yes, the MAX20343PEWE+T supports single-pin-enabled (RSEL) operation, eliminating the need for an I²C host. In this mode, output voltage is set by connecting the FAST/RSEL pin to GND through a resistor per Table 1 in the datasheet - e.g., 100kΩ yields 3.3V. All other functions (enable, PGOOD, FAST trigger) remain available via discrete pins. The MAX20343PEWE+T's factory configuration determines whether B1 functions as FAST or RSEL; the "PEWE+T" variant is I²C-controlled, but pin-compatible RSEL versions exist under different order codes.

What is the maximum continuous output power capability of the MAX20343PEWE+T, and what conditions affect it?

The MAX20343PEWE+T delivers up to 3.5W continuous output power when the integrator is enabled, BBstFETScale = 0, VIN > 2.7V, and VOUT ≥ 3.2V with 1µH inductor and 8µF output capacitance. Power drops to 1.75W when integrator is disabled or BBstFETScale = 1 - a deliberate trade-off to improve load transient settling time. Thermal limits also constrain power: on a four-layer board, θJA = 57.93°C/W limits practical continuous power to ~2.1W at +85°C ambient. The MAX20343PEWE+T's 3.5W rating reflects ideal thermal conditions and is validated per Electrical Characteristics table.