BM3451 - BYD Microelectronics

BM3451 3/4/5 Cell Battery Protectors

The BM3451 is a professional protection IC for 3/4/5 cells rechargeable battery pack; it is highly integrated, and generally used in power tools, electric bicycles and UPS applications. The BM3451 works constantly to monitor each cell’s voltage, the current of charge or discharge, and the temperature of the environment to provide overcharge, over-discharge,.

Features

(1) High-accuracy voltage detection for each cell
·overcharge threshold 3.6V~4.6V accuracy: ±25 mV (+25℃) accuracy: ±40 mV (-40℃ to +85℃)
·overcharge hysteresis 0.1V accuracy: ±50 mV
·over-discharge threshold 1.6V~3.0V accuracy: ±80 mV
·over-discharge hysteresis 0V / 0.2V / 0.4V accuracy: ±100 mV (2) Three grades voltage detection of discharge overcurrent
·discharge overcurrent 1 0.025 V ~ 0.30 V (50 mV step)
·discharge overcurrent 2 0.2 V / 0.3V / 0.4V / 0.6 V
·short circuit 0.8V / 1.2 V (3) Charge overcurrent detection
·detection voltage -0.03V / -0.05V / -0.1V / -0.15.