ISL94208 Datasheet, PDF (1/37 Pages) Intersil Corporation – 4- to 6-Cell Li-ion Battery Management Analog Front-End

4- to 6-Cell Li-ion Battery Management Analog
Front-End
ISL94208
The ISL94208 battery management IC is designed for use with
a microcontroller and features an analog front-end with
overcurrent protection for multi-cell Li-ion battery packs. The
ISL94208 supports battery packs consisting of 4 to 6 cells in
series and one or more cells in parallel.
Using an internal analog multiplexer, the ISL94208 allows a
separate microcontroller with an A/D converter to monitor
each cell voltage plus internal and external temperature.
The ISL94208 provides integral overcurrent and short circuit
protection circuitry, an internal 3.3V voltage regulator, internal
cell balancing switches, and drive circuitry for external FET
devices for control of pack charge and discharge.
Related Literature
• ISL94208EVZ Evaluation Kit User Guide
Features
• Software selectable overcurrent protection levels and
variable protect detection times
- 4 discharge overcurrent thresholds
- 4 short circuit thresholds
- 4 charge overcurrent thresholds
- 8 overcurrent delay times (charge)
- 8 overcurrent delay times (discharge)
- 2 short circuit delay times (discharge)
• Automatic FET turn-off and cell balance disable on reaching
external (battery) or internal (IC) temperature limit
• Automatic cell balance turn off on IC over-temperature
• Integrated charge/discharge FET drive circuitry
• Internal cell balancing FETs handle up to 200mA of
balancing current for each cell
• Sleep operation with negative or positive edge wake-up
• <10µA Sleep mode
Applications
• Power tools
• Portable equipment
• Battery backup systems
• Military electronics
200Ω
200Ω
200Ω
200Ω
200Ω
200Ω
B-
November 26, 2012
1
FN8306.0
ISL94208
VCC
VCELL6
CB6
WKUP
VCELL5
CB5
RGC
RGO
VCELL4
CB4
VFET2
VCELL3
CB3
VFET1
VCELL2
CB2
VBACK
VCELL1
CB1
VCELL0
SCL
SDA
TEMPI
TEMP3V
AO
VMON
CFET
DFET
V_SS
1.2MΩ
500Ω
P+
1.8MΩ
µC
SCL
SDA
V_CC
RESET
INT
A/D INPUT
I/O
1µF
100Ω
3.6V
CHRG
P-
FIGURE 1. TYPICAL APPLICATION
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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