MP2791
7-Cell to 14-Cell, High-Accuracy Battery
Monitor and Protector with Coulomb Counting
DESCRIPTION
FEATURES
The MP2791 is a robust battery management
device, providing a complete analog front-end
(AFE) monitoring and protection solution. It is
designed for multiple-cell series battery
management systems (BMS). The device can
support I2C or SPI communication. It supports
connections for 7-cell to 14-cell series battery
packs, with an absolute voltage exceeding 75V
on particular pins.
•
Incorporates Dual ADC Architecture:
o <±2% State-of-Charge (SOC) Error with
MPF4279x Fuel Gauge
o Cell Voltage Measurement Error <5mV
o Current/Coulomb Counter Error <±0.5%
o Strictly Synchronized Current/Voltage
Measurement for Impedance Sensing
Includes High-Side N-Channel MOSFET
Drivers for Charge and Discharge Control:
o Supports MOSFET Soft-Start Discharge
Control to Eliminate Pre-Charge Circuit
o Drives Up to 100A DC with Parallel N-
Channel MOSFETs
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The MP2791 integrates two separate analog-to-
digital converters (ADCs). The first ADC
measures each channel’s differential cell
voltages (up to 14 channels), die temperature,
and 4-channel temperatures via external NTC
thermistors. The second ADC measures the
charge/discharge current via an external current-
sense resistor. The dual ADC architecture
enables synchronous voltage and current
measurements for cell and pack impedance
monitoring.
Hardware Configurable Protections:
o Charge/Discharge OCP and SCP
o Cell UVP and OVP
o Pack UVP and OVP
o Cell Low-/High-Temperature Protection
o Die High-Temperature Protection
Passive Cell-Balancing up to 58mA per Cell:
o Can Drive External Balancing
Transistors
o Automatic or Manual Control
Additional Features:
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•
When paired with an MPF4279x fuel gauge, the
MP2791 can achieve a state-of-charge (SOC)
error to within 2%.
o Integrated 3.3V and 5V LDOs
o Reduced Current Standby Mode
o Load and Charger Plug-In Detection
o High-Voltage and Low-Voltage GPIOs
o Dedicated Thermistor Inputs
o Open Wire Detection
o Persistent Dead Battery Flag
o Lockable MTP Memory for Thresholds
I2C or SPI Interface with 8-Bit CRC
Random Cell Connection Tolerant
Available in a TQFP-48 (7mmx7mm)
Package
The MP2791 includes high-side MOSFET (HS-
FET) drivers for charge and discharge control.
The discharge (DSG) MOSFET driver includes a
configurable soft start (SS) that provides a
controlled turn-on, eliminating the need for an
external pre-charge circuit. The MOSFET drivers
also incorporate over-current protection (OCP),
short-circuit protection (SCP), battery under-
voltage protection (UVP), battery over-voltage
protection (OVP), and high-/low-temperature
protection. All of these protections have
configurable thresholds.
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Internal passive balancing MOSFETs can be
used to equalize mismatched cells, supporting
up to 58mA. There is also the option to drive
external balancing transistors (MOSFET or BJT).
APPLICATIONS
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•
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Battery Backups and UPSs
E-Bikes, E-Scooters
Light Electric Vehicles (LEVs)
Energy Storage Systems (ESS)
Power and Gardening Tools
The MP2791 is available in a TQFP-48
(7mmx7mm) package.
All MPS parts are lead-free, halogen-free, and adhere to the RoHS
directive. For MPS green status, please visit the MPS website under Quality
Assurance. “MPS”, the MPS logo, and “Simple, Easy Solutions” are
trademarks of Monolithic Power Systems, Inc. or its subsidiaries.
MP2791 Rev. 1.0
8/2/2023
MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2023 MPS. All Rights Reserved.
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