BM3452 Series
3
Cells
Battery Professional
Protectors
WI-D06-J-0066 Rev.A/0 1 / 16 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
sijiajie.1688
Applications
·Power tool
·Electric bicycle
·UPS backup battery Packages
SOP 16
Block Diagram
NTC TRH VM VC2 VC1 VCC VC3
TOV
TOVD
TOC1
TOC2
CDCT
GND
VIN
DO
CO
Figure 1
Selection Guides
1. Products name structure
Figure 2
2. Products catalogue
Type/Item
Overcharge protection
voltage
[V DET1]
Overcharge release voltage
[V REL1]
Over- discharge protection voltage [V DET2]
Over-
discharge release voltage [V REL2]
Discharge
overcurrent 1 detection voltage [V OC1]
Discharge overcurrent
2 detection voltage [V OC2]
Short circuit detection voltage [V SHORT ]
Charge overcurrent detection voltage [V OVCC ]
BM3452VJDC-S16A 4.300V 4.200V 2.500V 2.700V 0.100V 0.400V 0.800V -0.100V BM3452SMDC-S16A 4.225V
4.125V 2.800V 3.000V 0.100V 0.400V 0.800V -0.100V
BM3452HEDC-S16A 3.850V 3.750V 2.000V 2.500V 0.100V 0.400V 0.800V -0.100V
Table 1
Pin Configurations
Top View
VCC CDCT TOV TOVD VM
CO
DO VIN GND TOC1TOC2VC3VC2VC118
765432169
101112131415NTC TRH BM3452
Figure 3
Pin Definition
Pin number
Name Description
1
CDCT
CO ,DO controller for extended application
2 TOV
Connect to a capacitor for setting the delay time of
overcharge protection 3 TOVD
Connect to a capacitor for setting the delay time of
over-discharge protection
4 TOC1
Connect to a capacitor for setting the delay time of discharge
overcurrent 1 protection 5 TOC2
Connect to a capacitor for setting the delay time of discharge
overcurrent 2 protection 6 NTC Cell temperature detection 7 TRH Temperature protection reference
8 VM Voltage detection terminal 1 for detecting load or charger 9 CO Charge power mosfet control terminal, Open-Drain output 10
DO
Discharge power mosfet control terminal, CMOS output
11 VIN
Charge and Discharge overcurrent Voltage detection
terminal 2 12 GND Ground pin of the IC, Cell1 negative input 13 VC1 Cell1 positive input, Cell2 negative input 14 VC2 Cell2 positive input, Cell3 negative input 15 VC3 Cell3 positive input
16
VCC
Power supply,Cell3 positive input
Table 2
Absolute Maximum Ratings
Item Symbol
Description Ratings Unit
Power supply voltage VCC - GND-0.3 ~ GND+30 V Single cell input voltage
V CELL Vcell3 Vcell2,Vcell1
GND-0.3 ~ GND+6 V VM input voltage VM VM GND-20 ~ GND+30 V DO output voltage V DO DO GND-0.3 ~ VCC+0.3 V CO output voltage V CO CO GND-20 ~ VCC+0.3
V Operating temperature T A - -40 ~ 85 ℃ Storage temperature
T STG
-
-40 ~ 125
℃
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.
Electrical Characteristics （T A =25℃ unless otherwise specified ）
Item Symbol Test conditions*1
Min. Typ. Max. Unit
Test
circuit
Power supply voltage VCC - 5 - 30 V
1
Operating consumption I CC V1=V2=V3= 3.5V - - 25 μA Sleeping consumption
I SLP V1=V2=V3= 2.0V - - 10 μA Overcharge
Protection
threshold V DET1 V1=V2=3.5V
V3=3.5→4.4V V DET1 -0.025
V DET1
V DET1 +0.025
V
2
Protection delay time
T OV V1=V2=3.5V C OV =0.1μF
V3=3.5V →4.4V
0.5 1.0 1.5 s Release threshold V REL1 V1=V2=3.5V V3=4.4V →3.5V V REL1 -0.05
V REL1
V REL1 +0.05
V
Release delay time T REL1 V1=V2=3.5V V3=4.4V →3.5V 10 20 30 ms Temperature factor(1) K U1 Ta= -40℃ to 85℃ -0.6 0 0.6 mV/℃Over- discharge
Protection threshold
V DET2 V1=V2=3.5V V3=3.5V →2.0V V DET2 -0.08
V DET2
V DET2 +0.08
V
Protection delay time T OVD V1=V2=3.5V C OVD =0.1μF
V3=3.5V →2.0V
0.5 1.0 1.5 s Release threshold V REL2 V1=V2=3.5V V3=2.0V →3.5V V REL2 -0.10
V REL2
V REL2 +0.10
V
Release delay time T REL2 V1=V2=3.5V V3=2.0V →3.5V 10 20 30 ms Discharge overcurrent 1
Protection threshold V OC1
V1=V2=V3=3.5V V4=0V →0.12V V OC1 *85%
V OC1
V OC1 *115%
V
3
Protection delay time
T OC1 V1=V2=V3=3.5V C OC1=0.1μF V4=0V →0.12V 100 200 300 ms
Release delay time T ROC1 V1=V2=V3=3.5V V4=0V →0.12V →0V 100 200 300 ms
Resistance between VM and GND R VMS
V1=V2=V3=3.5V V4=0V →0.12V 100 300 500 k Ω
Temperature factor(2)
K U2 Ta= -40℃ to 85℃ -0.1 0 0.1 mV/℃Discharge overcurrent 2
Protection threshold
V OC2
V1=V2=V3=3.5V V4=0V →0.5V
V OC2 *80%
V OC2
V OC2 *120%
V
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