2024年4月6日发(作者：中智纯)
BM3452 Series
BYD Microelectronics Co., Ltd.
3 Cells Battery Professional Protectors
General Description
The BM3452 is a professional protection IC for 3 cells rechargeable battery pack; it is highly integrated,
and generally used in power tools, electric bicycles and UPS applications.
The BM3452 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, discharge overcurrent, short
circuit, charge overcurrent and over-temperature protections, etc. Besides, it also can change the
protection delay time of overcharge, over-discharge and discharge overcurrent by setting the external
capacitors.
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 / -0.15V / -0.2 V
(4) Setting of output delay time
·overcharge, over-discharge, discharge overcurrent 1 and discharge overcurrent 2 protection delay
time can be set by external capacitors
(5) Controlling the state of charge or discharge by external signals
(6) The maximum output voltage of CO / DO: 12V
(7) Over-temperature protection
(8) Wide operation Temp Range: -40℃~85℃
(9) Breaking Wire Protection
(10) Low power consumption
·operation mode（with Temp protection） 25 μA typical
·operation mode（without Temp protection） 15 μA typical
·sleeping mode 6 μA typical
Datasheet
WI-D06-J-0066 Rev.A/0 1 / 16
BYD Microelectronics Co., Ltd.
BM3452
Series
Applications
·Power tool
·Electric bicycle
·UPS backup battery
Packages
SOP 16
Block Diagram
CDCT
CO、DO
Series
VCC
+
VC3
-
+
-
OR
+
VC2
-
-
TOV
TOVD
TOC1
TOC2
OR
+
External
Delay Time
Logic Circuit
+
VC1
-
+
-
GND
NTC
TRH
Temp
Protection
Charger /
Load
Detection
Overcurrent
Detection
CO、DO
Driver
VIN
VM
DO
CO
Figure 1
Datasheet
WI-D06-J-0066 Rev.A/0 2 /16
2024年4月6日发(作者：中智纯)
BM3452 Series
BYD Microelectronics Co., Ltd.
3 Cells Battery Professional Protectors
General Description
The BM3452 is a professional protection IC for 3 cells rechargeable battery pack; it is highly integrated,
and generally used in power tools, electric bicycles and UPS applications.
The BM3452 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, discharge overcurrent, short
circuit, charge overcurrent and over-temperature protections, etc. Besides, it also can change the
protection delay time of overcharge, over-discharge and discharge overcurrent by setting the external
capacitors.
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 / -0.15V / -0.2 V
(4) Setting of output delay time
·overcharge, over-discharge, discharge overcurrent 1 and discharge overcurrent 2 protection delay
time can be set by external capacitors
(5) Controlling the state of charge or discharge by external signals
(6) The maximum output voltage of CO / DO: 12V
(7) Over-temperature protection
(8) Wide operation Temp Range: -40℃~85℃
(9) Breaking Wire Protection
(10) Low power consumption
·operation mode（with Temp protection） 25 μA typical
·operation mode（without Temp protection） 15 μA typical
·sleeping mode 6 μA typical
Datasheet
WI-D06-J-0066 Rev.A/0 1 / 16
BYD Microelectronics Co., Ltd.
BM3452
Series
Applications
·Power tool
·Electric bicycle
·UPS backup battery
Packages
SOP 16
Block Diagram
CDCT
CO、DO
Series
VCC
+
VC3
-
+
-
OR
+
VC2
-
-
TOV
TOVD
TOC1
TOC2
OR
+
External
Delay Time
Logic Circuit
+
VC1
-
+
-
GND
NTC
TRH
Temp
Protection
Charger /
Load
Detection
Overcurrent
Detection
CO、DO
Driver
VIN
VM
DO
CO
Figure 1
Datasheet
WI-D06-J-0066 Rev.A/0 2 /16