The bq2941x is a secondary overvoltage protection IC for 2-, 3-, or 4-cell lithium-ion battery packs that incorporates a high-accuracy precision overvoltage detection circuit. It includes a programmable delay circuit for overvoltage detection time.
FUNCTION
Each cell in a multiple-cell pack is compared to an internal reference voltage. If one cell reaches an overvoltage condition, the protection sequence begins. The bq2941x device starts charging an external capacitor through the CD pin. When the CD pin voltage reaches 1.2 V, the OUT pin changes from a low level to a high level.
Feature
2-, 3-, or 4-Cell SecondaryProtection
Low Power Consumption ICC < 2 μA [VCELL(ALL) < V(PROTECT)]
Fixed High Accuracy Overvoltage Protection Threshold
bq29410 = 4.35 V
bq29411 = 4.40 V
bq29412 = 4.45 V
bq29413 = 4.50 V
bq29414 = 4.55 V
bq29415 = 4.60 V
bq29419 = 4.30 V
Programmable Delay Time of Detection
High Power Supply Ripple Rejection
Stable During Pulse Charge Operation
APPLICATIONS
Catalogue
FPGA / CPLD
Memory
MOS 
MCU 
DSP
OCEP
Secondary 
Other 
