MPF42793 2 to 16 Stacked Lithium Iron Phosphate Cells Battery Pack Fuel Gauge QFN-32

MPF42793 2 to 16 Stacked Lithium Iron Phosphate Cells Battery Pack Fuel Gauge QFN-32

The MPF42793 is a drop-in solution to provide comprehensive status information on lithium iron phosphate (LFP or LiFePO4) battery strings with up to 16 series cells.

Key Specifications

Features

• Compatible with Commonly used Battery Monitors for up to 16 Series Cells o ±5% State-of-Charge (SOC) Accuracy when Paired with MP279x Battery Monitors
• Provides Critical Battery Information: o Pack and Cell SOC o Pack and Cell State-of-Health (SOH) o Remaining Runtime and Charge Time o Instantaneous Available Power
• Optimized for Lithium Iron Phosphate (LFP) Batteries
• Provides Lifetime Logging
• Supports 5-Level LED SOC Indicator with Push-Button Trigger
• 2.5V Minimum Supply Voltage
• Low Current Consumption: 6µA in Disabled Mode and 135µA (Average) in Operating Mode during Rest
• Supports Up to 400kHz I2C with Cyclic Redundancy Check (CRC) for Robust Communication
• Available in a Compact TQFN-32 (4mmx4mm) Package
• Available in Turnkey MPS BMS Module: o MBM16S-P50-C

Typical Application Circuit

Applications

• Light Electric Vehicles (EVs): Scooters, Bikes, and Golf Carts
• Energy Storage: Uninterruptable Power Supplies (UPS) and Renewable Energy
• Industrial Robots, Floor Cleaners, and Forklifts

Design Notes

• Cell measurement accuracy is specified over temperature — calibrate the sense path if the gauge reports state of charge rather than raw voltage.
• Balance current is limited by the bleed resistor and the pack wiring; check the resulting balance time for the capacity mismatch you expect.
• Protection thresholds should sit inside the cell maker's absolute limits with margin for measurement error.
• Keep the sense lines separate from the power path to avoid IR drop corrupting readings.

Common Questions