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
·overcharge hysteresis
·over-discharge threshold
·over-discharge hysteresis
accuracy: ±25 mV (+25
℃
)
accuracy: ±40 mV (-40℃ to +85℃)
0.1V
accuracy: ±50 mV
1.6V~3.0V
accuracy: ±80 mV
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)
(6)
(7)
(8)
Controlling the state of charge or discharge by external signals
The maximum output voltage of CO / DO: 12V
Over-temperature protection
Wide operation Temp Range: -40℃~85℃
(9) Breaking Wire Protection
(10) Low power consumption
·operation mode（with Temp protection）
·operation mode（without Temp protection）
·sleeping mode
25
μA
15
μA
6
μA
typical
typical
typical
Datasheet
WI-D06-J-0066 Rev.A/0
1
/
16
BYD Microelectronics Co., Ltd.
BM3452
Series
Pin Definition
Pin number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Name
CDCT
TOV
TOVD
TOC1
TOC2
NTC
TRH
VM
CO
DO
VIN
GND
VC1
VC2
VC3
VCC
Description
CO ,DO controller for extended application
Connect to a capacitor for setting the delay time of
overcharge protection
Connect to a capacitor for setting the delay time of
over-discharge protection
Connect to a capacitor for setting the delay time of discharge
overcurrent 1 protection
Connect to a capacitor for setting the delay time of discharge
overcurrent 2 protection
Cell temperature detection
Temperature protection reference
Voltage detection terminal 1 for detecting load or charger
Charge power mosfet control terminal, Open-Drain output
Discharge power mosfet control terminal, CMOS output
Charge and Discharge overcurrent Voltage detection
terminal 2
Ground pin of the IC, Cell1 negative input
Cell1 positive input, Cell2 negative input
Cell2 positive input, Cell3 negative input
Cell3 positive input
Power supply,Cell3 positive input
Table 2
Absolute Maximum Ratings
Item
Power supply voltage
Single cell input voltage
VM input voltage
DO output voltage
CO output voltage
Operating temperature
Storage temperature
Symbol
VCC
V
CELL
VM
V
DO
V
CO
T
A
T
STG
Description
-
Vcell3
Vcell2,Vcell1
VM
DO
CO
-
-
Table 3
Caution:
The absolute maximum ratings are rated values exceeding which the product could suffer
physical damage. These values must therefore not be exceeded in any conditions.
4
/16
Ratings
GND-0.3 ~ GND+30
GND-0.3 ~ GND+6
GND-20 ~ GND+30
GND-0.3 ~ VCC+0.3
GND-20 ~ VCC+0.3
-40 ~ 85
-40 ~ 125
Unit
V
V
V
V
V
℃
℃
Datasheet
WI-D06-J-0066 Rev.A/0
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