Monolithic Power Systems Inc. MP2791DFP-0002-T

Overview

MP2791DFP-0002-T from Monolithic Power Systems is a 7- to 14-cell battery monitor and protector IC with dual ADC architecture, ±2% SOC error (with MPF4279x fuel gauge), <5mV cell voltage measurement error, and integrated high-side N-channel MOSFET drivers for charge/discharge control. It supports SPI interface with 8-bit CRC and operates up to 65.8V VTOP, targeting high-voltage energy storage and e-mobility BMS applications.

For engineers reviewing the MP2791DFP-0002-T datasheet, MP2791DFP-0002-T pinout, MP2791DFP-0002-T application, or MP2791DFP-0002-T equivalent, this device delivers synchronized voltage/current sampling for impedance sensing, configurable hardware protections (OVP/UVP/OTP/SCP/OCP), passive balancing up to 58mA per cell, and TQFP-48 package compatibility for industrial-grade battery pack monitoring.

Technical Context

The MP2791DFP-0002-T integrates two independent sigma-delta ADCs: one measures up to 14 differential cell voltages, die temperature, and four external NTC thermistors; the other measures bidirectional current via an external sense resistor. This enables strictly synchronous acquisition for real-time cell impedance calculation and Coulomb counting.

It implements hardware-based protection logic with user-configurable thresholds for cell/pack over- and under-voltage, over-current (OC1/OC2), short-circuit (SC), and temperature faults. Its high-side CHG/DSG drivers support soft-start discharge control and drive parallel N-channel MOSFETs rated for up to 100A DC, eliminating need for external pre-charge circuitry.

Key Specifications

Pinout & Package

The MP2791DFP-0002-T is housed in a TQFP-48 (7mm × 7mm) package with exposed thermal pad. Pin functions are validated per MPS MP2791 Rev. 1.0 datasheet (Aug 2023), including dedicated cell voltage inputs (C0–C14), high-voltage GPIOs (GPIOHV1), thermistor bias (NTCB), and dual MOSFET drivers (CHG, DSG, SBYDSG).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar battery monitor and protector applications.

Compared with BQ76952 and ISL94203, MP2791DFP-0002-T uniquely combines 65.8V VTOP operation, SPI interface with CRC, on-die 58mA balancing FETs, and high-voltage GPIOs - making it optimal for ruggedized 13S–14S energy storage and e-mobility systems demanding autonomous protection and minimal external components.

Availability

MP2791DFP-0002-T is available at Aetrix Electronics and suitable for battery backup systems, e-mobility platforms, and energy storage systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.

Supply support for MP2791DFP-0002-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

Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-performance power management ICs, with over two decades of innovation in battery management, DC/DC conversion, and motor control.

The MP2791 product line is designed specifically for high-voltage, multi-cell lithium-based battery packs - delivering integrated analog front-end functionality, hardware safety enforcement, and scalable communication for next-generation BMS architectures.

FAQ

What communication protocol does MP2791DFP-0002-T support?

MP2791DFP-0002-T supports SPI interface with 8-bit CRC error detection, as indicated by its "-0002" configuration code. It does not support I2C in this variant - only SPI clock (SCK), data in (SDI), data out (SDO), and chip select (nCS) pins are active for communication.

Does MP2791DFP-0002-T include internal balancing transistors?

Yes - it integrates on-die N-channel MOSFETs for passive cell balancing, rated for up to 58mA per cell at 25°C. The RDS(ON) is 28Ω (typ.), with full specification across –40°C to +85°C. External balancing transistors can also be driven via dedicated control outputs.

What is the maximum supported battery stack voltage?

The MP2791DFP-0002-T supports VTOP up to +65.8V in normal operation, with absolute maximum rating of +75V on VTOP, PACKP, and GPIOHV1 pins. This enables reliable use in 14S Li-ion (52.5V nominal) and 13S LFP (48.1V nominal) battery packs.

How does the dual ADC architecture improve BMS performance?

The dual sigma-delta ADCs operate independently and synchronously: one captures all 14 cell voltages and temperatures every 2ms; the other samples current simultaneously. This enables true impedance calculation (Z = ΔV/ΔI) and eliminates phase-induced SOC errors in dynamic load conditions.

Can MP2791DFP-0002-T drive 100A discharge MOSFETs directly?

Yes - its DSG driver supports parallel N-channel MOSFETs rated for up to 100A DC. The driver provides 10V gate drive with ±0.7V accuracy and includes configurable soft-start to limit inrush current, eliminating need for external pre-charge circuitry in high-power systems.

Is open-wire detection supported, and how is it implemented?

Yes - open-wire detection is implemented via dedicated pull-up (100µA) and pull-down (100µA) current sources on cell input pins. When a cell connection opens, the resulting voltage shift triggers detection within one conversion cycle, and the fault is latched in register status.

What is the purpose of the SBYDSG pin?

SBYDSG is a P-channel MOSFET driver used for discharge bypass control during sleep or safe-state modes. It allows controlled discharge path activation independent of main DSG FET, enabling low-power maintenance discharge or thermal management without waking the full BMS system.