Monolithic Power Systems Inc. MBM14S-P100-B

Overview

MBM14S-P100-B from Monolithic Power Systems is a high-power, complete battery management unit (BMU) evaluation kit supporting up to 14-series lithium-based cells, integrating the MP2791 analog front-end and MPF42791 fuel gauge ICs, delivering 100A continuous charge/discharge current, hardware-level over-voltage/under-voltage/over-current/short-circuit/temperature protections, and real-time SoC estimation via MPS GUI.

For engineers reviewing the MBM14S-P100-B datasheet, MBM14S-P100-B pinout, MBM14S-P100-B application, or MBM14S-P100-B equivalent, this kit enables rapid validation of high-current BMS architectures for e-mobility, energy storage, and industrial UPS systems - with configurable thresholds, cell balancing, RS-485/I²C interface, and GUI-driven configuration.

Technical Context

The MBM14S-P100-B implements a dual-IC architecture: MP2791 provides synchronous voltage/current ADC sampling, high-side N-channel MOSFET gate driving (10× parallel IAUS300N08S5N0), and hardware fault response with <5µs OCP/SCP latency; MPF42791 delivers model-based SoC, time-to-full/empty, and unavailable energy estimation using voltage, current, and temperature inputs.

It features two PCBs - a 97mm × 61mm control board (STM32F030C8 MCU, MAX13085E RS-485 transceiver, MP4569 buck converter) and a 123mm × 121mm FETs board - with 4–5mΩ total high-side protection resistance, open-wire detection, and sleep mode with automatic wake-up on load/charger detection.

Key Specifications

Availability

MBM14S-P100-B is available at Aetrix Electronics and suitable for e-bike battery packs, stationary energy storage systems, and industrial uninterruptible power supplies requiring stable component supply, full-stack BMS validation, and production-ready reference design fidelity.

Supply support for MBM14S-P100-B 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 battery management, DC/DC conversion, and motor control solutions for automotive, industrial, and consumer markets.

The MBM14S-P100-B belongs to MPS's BMU evaluation platform family, designed to accelerate development of scalable, high-current lithium battery systems by integrating proven AFE and fuel gauge ICs into validated hardware/software stacks.

FAQ

What is the difference between MBM14S-P100 and MBM14S-P100-B?

The MBM14S-P100-B uses the next-generation MPF42791 fuel gauge IC instead of MPF42790, offering improved SoC accuracy across wider temperature ranges and enhanced model adaptability for diverse lithium chemistries including LFP and NMC. Both share identical MP2791 AFE and mechanical form factor.

Does MBM14S-P100-B support external cell balancing?

Yes - while the MP2791 integrates internal balancing FETs for low-current passive balancing, the board provides dedicated gate drive signals and layout space to connect external high-current balancing FETs, enabling >300mA per-cell balancing current when configured with external components.

Can MBM14S-P100-B be used with lithium iron phosphate (LFP) batteries?

Yes - the MPF42791 fuel gauge supports customizable battery models, and the MP2791's configurable UV/OV thresholds (down to 2.0V/cell, up to 4.5V/cell) accommodate LFP's 2.5–3.65V nominal range; calibration via MPS GUI ensures accurate SoC tracking.

What communication protocols does MBM14S-P100-B support out-of-the-box?

It supports RS-485 (via MAX13085E transceiver) and I²C (via MP2791 and MPF42791 interfaces) simultaneously; RS-485 enables multi-node daisy-chaining in large battery packs, while I²C allows direct connection to host microcontrollers for embedded integration.

Is the STM32F030C8 microcontroller user-programmable?

No - the onboard STM32F030C8 runs pre-flashed firmware that manages USB-to-RS485/I²C bridging, LED status reporting, and GUI command translation; it is not exposed for end-user reprogramming but ensures deterministic interface behavior and GUI compatibility.

What is the purpose of the EVKT-USB_RS485/I2C-01 adapter included in the kit?

This adapter converts USB signals from a host PC into isolated RS-485 or I²C, enabling secure, noise-immune communication with the MBM14S-P100-B control board; it eliminates ground loop risks and supports long-distance cabling in noisy industrial environments.