Monolithic Power Systems Inc. MBM14S-P100

Overview

MBM14S-P100 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 MPF42790 fuel gauge ICs. It delivers up to 100A continuous charge/discharge current, features hardware-level over-voltage, under-voltage, over-current, short-circuit, and temperature protections, and enables real-time SoC estimation via configurable battery modeling.

For engineers reviewing the MBM14S-P100 datasheet, MBM14S-P100 pinout, MBM14S-P100 application, or MBM14S-P100 equivalent, this kit provides full GUI-driven configuration, RS-485/I²C interface access, simultaneous voltage/current ADC sampling, internal/external cell balancing control, and open-wire detection for rapid BMS validation in EV, energy storage, and industrial battery systems.

Technical Context

The MBM14S-P100 implements a dual-board architecture: a control board hosting the STM32F030C8 MCU, MP2791 AFE (TQFP-48), and MPF42790 fuel gauge (TQFN-32); and a separate FETs board with ten parallel Infineon IAUS300N08S5N0 MOSFETs rated for 300A peak current. The system uses synchronous dual ADCs for simultaneous cell voltage and pack current measurement with ≤1mV typical accuracy.

Protection logic is implemented in hardware via dedicated comparators and threshold latches within the MP2791, enabling sub-10µs response to over-current and short-circuit events. Cell balancing supports both internal FETs (up to 100mA) and external FET control, while the MPF42790 performs model-based SoC estimation using voltage, current, and temperature inputs without requiring coulomb counting alone.

Key Specifications

Availability

MBM14S-P100 is available at Aetrix Electronics and suitable for electric vehicle battery validation, grid-scale energy storage system prototyping, and industrial UPS development requiring stable component supply, pre-validated protection firmware, and production-ready hardware architecture.

Supply support for MBM14S-P100 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 design expertise in battery management, DC/DC conversion, and motor control solutions.

The MBM14S-P100 belongs to MPS's BMU (Battery Management Unit) evaluation platform family, engineered to accelerate time-to-market for high-current, multi-cell lithium battery systems by integrating AFE, fuel gauge, protection, and GUI software into a single validated reference solution.

FAQ

What is the maximum supported battery pack voltage for MBM14S-P100?

The MBM14S-P100 supports a maximum pack voltage of 65.8V, corresponding to 14-series lithium cells at 4.7V per cell. This rating is enforced by the MP2791's absolute maximum cell voltage limit and the board's 70V-rated input capacitors and TVS diodes on VPack+/VBat+ lines.

Does MBM14S-P100 include both charge and discharge MOSFETs?

Yes - the FETs board integrates ten parallel N-channel IAUS300N08S5N0 MOSFETs configured as high-side switches for both charge and discharge paths, with independent gate drivers and dedicated pre-charge circuitry to prevent inrush current damage during connection.

Can MBM14S-P100 operate without the GUI software?

No - the STM32F030C8 microcontroller requires the proprietary MPS GUI (installed via .msi package) to configure protection thresholds, enable balancing, read telemetry, and update firmware. Standalone operation is not supported; all runtime parameters are loaded via I²C from the host PC.

What communication protocols does MBM14S-P100 support natively?

The kit supports I²C (via onboard MP2791/MPF42790) and RS-485 (via MAX13085ECSA+ transceiver) as primary interfaces. UART is accessible only through the USB-to-RS485/I²C adapter (EVKT-USB_RS485/I2C-01); no native TTL UART header is provided on the control board.

Is cell balancing automatic or user-configurable?

Cell balancing is fully user-configurable via the GUI: users can set voltage thresholds, enable/disable internal FET balancing (≤100mA), or activate external FET control signals (GPIO-driven) for higher-current external balancing circuits. Balancing starts only when cell delta exceeds the programmed window.

What safety certifications does MBM14S-P100 meet?

The MBM14S-P100 evaluation kit itself carries no end-product safety certification (e.g., UL, CE). However, its constituent components - including Infineon MOSFETs (AEC-Q101), Diodes Inc. Zeners (AEC-Q101), and Vishay shunt resistors - are automotive-grade qualified, and the design follows IPC-2221B layout standards for high-current isolation and creepage.

How is temperature monitoring implemented on MBM14S-P100?

Temperature is monitored via two NTC thermistors (Murata NCP18XH103F03RB) - one placed on the FETs board near the MOSFET array, and one on the control board near the AFE IC. Both feed into dedicated ADC channels of the MP2791, enabling independent OTP/UTP protection per zone with programmable hysteresis.