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DS2726 Datasheet(PDF) 10 Page - Maxim Integrated Products

Part # DS2726
Description  5-Cell to 10-Cell Li Protector with Cell Balancing
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

DS2726 Datasheet(HTML) 10 Page - Maxim Integrated Products

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Li+ Protection Conditions
Overvoltage, OV. If any cell voltage (VCELL) exceeds
the overvoltage threshold, VOV, for a period longer than
overvoltage delay, tOVD, the DS2726 shuts off the
external charge FET. When VCELL falls below the
charge-enable threshold VCE, the DS2726 turns the
charge FET on. The discharge FET remains enabled
during the overvoltage event. Care should be taken
while discharging during an OV condition because the
current drawn by the load is going through the body
diode of the CC FET.
Undervoltage, UV. If VCELL drops below the undervolt-
age threshold, VUV, for a period longer than undervolt-
age delay, tUVD, the DS2726 shuts off the charge and
discharge FETs and enters Sleep Mode. The device
remains in Sleep Mode until a charger is detected, at
which point the DS2726 wakes up and enables the CC
FET. The DC FET remains disabled until every cell is
above the VUV_REL threshold. Care should be taken
while charging during a UV event because the charge
current is flowing through the body diode of the DC FET.
Discharge Overcurrent, DOC. If VSNS is less than
VRDOC for a period longer than tDOCD, the DS2726
shuts off the external discharge FET. The discharge
current path is not reestablished until VPKP rises above
VVIN - VTP. The DS2726 provides a test current of value
ITST from the PKP pin to the VIN pin to detect the
removal of the offending low-impedance load. ITST is
not disabled if an undervoltage condition is reached.
Short Circuit, SC. If VSNS is less than VRSC for a peri-
od longer than short-circuit delay tSCD, the DS2726
shuts off the external discharge FET. The discharge
current path is not reestablished until VPKP rises above
VVIN - VTP. The DS2726 provides a test current of value
ITST from the PKP pin to the VIN pin to detect the
removal of the short. ITST is disabled if an undervoltage
condition is reached.
Summary. All the protection conditions described are
logic ORed to affect the CC and DC outputs:
DC = (Undervoltage) or (Discharge Overcurrent) or
(Short Circuit)
CC = (Overvoltage) or (Undervoltage and Charger
Detect)
5-Cell to 10-Cell Li+ Protector with
Cell Balancing
10
______________________________________________________________________________________
VOV
VCE
VUV
VCELL
VSNS
VRSC
VRDOC
VVIN
tOVD
tOVD
tUVD
tUVD
tOCD
tSCD
CHARGE
DISCHARGE
POWER
MODE
ACTIVE
SLEEP
CC
DC
VOHCC
VOLCC
VOLDC
VOHDC
VUV_REL
Figure 3. Li+ Protection Circuitry Example Waveforms


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