Monolithic Power Systems Inc. MBM16S-P100-B

Overview

MBM16S-P100-B from Monolithic Power Systems is a high-power, 16-cell battery management unit (BMU) evaluation kit integrating the MP2797 battery monitor AFE and MPF42791 next-generation fuel gauge IC. It delivers up to 100A continuous charge/discharge current, supports 18V–70.4V pack voltage, features hardware-based OVP/UVP/OCP/SCP/OTP/UTP protection, and enables cell balancing via internal FETs or external high-current FETs - deployed in industrial energy storage and e-mobility battery validation.

For engineers reviewing the MBM16S-P100-B datasheet, MBM16S-P100-B pinout, MBM16S-P100-B application, or MBM16S-P100-B equivalent, this page provides verified hardware specifications, GUI-driven configuration workflow, RS-485/I²C interface support, thermal monitoring architecture, and real-world SoC estimation performance using MPS's proprietary battery model.

Technical Context

The MBM16S-P100-B implements a dual-IC architecture: the MP2797 TQFP-48 AFE performs synchronous 16-cell voltage and current measurement with two independent ADCs, while the MPF42791 TQFN-32 fuel gauge executes real-time SoC, time-to-full/empty, and unavailable energy estimation using voltage, current, and temperature inputs fused with a pre-characterized battery model.

Hardware protection is implemented at the board level via configurable thresholds and dedicated analog comparators - including over-voltage (up to 4.5V/cell), under-voltage, over-current (configurable up to 196.6A), short-circuit, and temperature limits - with automatic fault response and open-wire detection across all cell sensing lines.

Key Specifications

Availability

MBM16S-P100-B is available at Aetrix Electronics and suitable for industrial battery validation, energy storage system prototyping, and e-mobility BMS development requiring stable component supply, repeatable test environments, and production-ready firmware integration pathways.

Supply support for MBM16S-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 industrial, automotive, and computing markets.

The MBM16S-P100-B belongs to MPS's BMU evaluation platform family, designed to accelerate development of scalable, high-accuracy battery systems by integrating their MP279x AFE and MPF4279x fuel gauge ICs into validated, GUI-configurable hardware.

FAQ

What is the difference between MBM16S-P100-B and MBM16S-P100?

The MBM16S-P100-B uses the MPF42791 next-generation fuel gauge IC, offering improved SoC accuracy and enhanced battery modeling versus the MPF42790 in the standard MBM16S-P100. Both share the same MP2797 AFE, 16-cell support, and 100A current capability, but the -B variant enables more precise state estimation for demanding applications like grid-scale storage.

Does MBM16S-P100-B support external cell balancing FETs?

Yes - the board provides gate drive signals and layout provisions for external balancing FETs, allowing higher balancing currents beyond the internal MP2797 FETs' capability. The schematic and BOM include reference designators and footprint support for discrete external balancing circuits.

Can MBM16S-P100-B operate standalone without a PC?

No - it requires connection to a Windows PC running the MPS GUI software via USB-to-RS-485/I²C adapter (EVKT-USB_RS485/I2C-01). The board lacks onboard nonvolatile configuration storage or autonomous runtime firmware; all setup, calibration, and monitoring are host-controlled.

What battery chemistries does MBM16S-P100-B support?

It supports all lithium-based chemistries (LiCoO₂, NMC, LFP, NCA, LiPo) through user-selectable battery models in the GUI. The MPF42791's adaptive algorithm accommodates varying voltage profiles and impedance characteristics without hardware modification.

Is open-wire detection implemented on all cell inputs?

Yes - the MP2797 AFE provides per-cell open-wire detection using dedicated comparators and bias current sources. The MBM16S-P100-B routes all 16 cell sense lines through protected differential inputs, and fault status is reported in real time via the GUI and RS-485 register map.

What is the role of the STM32F030C8 microcontroller on the control board?

The STM32F030C8 acts as a bridge controller - managing USB enumeration, translating GUI commands to MP2797/MPF42791 register writes, handling LED indicators, and routing RS-485/I²C traffic. It does not perform battery algorithms; those run exclusively on the dedicated fuel gauge and AFE ICs.