Monolithic Power Systems Inc. MEZS7-1S-4SPDPOWERBANK

Overview

MEZS7-1S-4SPDPOWERBANK from Monolithic Power Systems is a bidirectional USB PD power bank reference design module integrating the MP2651 buck-boost charger IC and CYPD3171 PD controller. It supports 1S–4S Li-ion battery packs, delivers up to 5A charge current, operates across 4V–22V input, and features a DRP USB Type-C port compliant with USB PD3.0 and BC1.2 protocols for portable power applications.

For engineers reviewing the MEZS7-1S-4SPDPOWERBANK datasheet, MEZS7-1S-4SPDPOWERBANK pinout, MEZS7-1S-4SPDPOWERBANK application, or MEZS7-1S-4SPDPOWERBANK equivalent, this evaluation board enables rapid validation of bidirectional PD charging/discharging, I²C-configurable voltage/current settings, thermal performance at 56.5°C under full load, and compatibility with common 0805/0603 passives and MPS inductors like MPL-AL5030.

Technical Context

This solution implements a dual-role port (DRP) architecture where the CYPD3171 handles USB PD negotiation and policy engine execution, while the MP2651 manages synchronous buck-boost conversion with 600kHz switching frequency and I²C-programmable regulation points. The board routes all critical signals-including SCL/SDA, IMON, VTARG, and XRES-to support firmware updates and real-time parameter tuning.

Charge mode accepts 4V–22V input and regulates battery voltage up to 8.4V (I²C-configurable), while source mode delivers 3V–21V output from the battery pack. Efficiency peaks at 96.33% (charge) and 96.37% (source), validated with 2-cell Li-ion (7.4V–8.4V) under defined test conditions including CIN = 5×10μF + 1×1μF and L = 1.5μH.

Key Specifications

Availability

MEZS7-1S-4SPDPOWERBANK is available at Aetrix Electronics and suitable for portable power bank development, USB-C PD reference design validation, and bidirectional charging system integration requiring stable component supply and documented thermal/efficiency benchmarks.

Supply support for MEZS7-1S-4SPDPOWERBANK 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

Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-performance power management ICs, with expertise in DC/DC converters, battery chargers, and USB PD solutions for consumer, industrial, and automotive markets.

The MEZS7-1S-4SPDPOWERBANK belongs to MPS's reference design module portfolio, developed to accelerate time-to-market for USB PD-compliant portable power systems using their proprietary buck-boost and PD controller ICs.

FAQ

Is MEZS7-1S-4SPDPOWERBANK a production-ready component or a development tool?

It is an evaluation board-not a standalone IC or discrete component. Designed as a reference solution, it integrates MP2651 and CYPD3171 to demonstrate bidirectional PD operation, enabling engineers to validate firmware, layout, thermal behavior, and protocol compliance before custom design.

What battery configurations does this board support out of the box?

The board is configured for 2S Li-ion (8.4V full-charge), but its MP2651-based architecture natively supports 1S–4S series battery packs. Voltage and current limits are I²C-configurable, allowing adaptation to 3.7V–16.8V battery ranges without hardware change.

Can the CCG3PA (CYPD3171) firmware be reprogrammed?

Yes. The board includes a configuration header for programming the CYPD3171 via SWD. Users can load custom PD policy code, modify PDOs, adjust timing parameters, or implement vendor-defined messages using Cypress/Infineon tools and SDKs.

Does this board support USB PD3.0 extended power range (EPR)?

No. The CYPD3171 supports USB PD3.0 up to 20V/5A (100W), but not EPR (up to 48V). Its PDO set is limited to standard fixed and programmable voltage profiles within the 3.3V–21V range, consistent with PD3.0 baseline specification.

What is the recommended inductor for optimal efficiency?

MPS specifies the MPL-AL5030-1R5 (1.5μH, 9.7mΩ DCR, 9A saturation current) as the optimized inductor. Substitution requires matching saturation current, DCR, and footprint to maintain 96.3% peak efficiency and thermal stability under 5A charge loads.

Is there a direct replacement for this end-of-life board?

Yes - MPS explicitly states "END OF LIFE, REFER TO MEZS7-PDPOWERBANK-MP2651". That newer variant retains the same core ICs and functionality but incorporates updated layout, BOM, and firmware support aligned with current MP2651 revisions and PD certification requirements.