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参数资料
| 型号： | DS2726G+T&R |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 10/16页 |
| 文件大小： | 0K |
| 描述： | IC PROT LI+ 5-10CELL 32-TQFP |
| 标准包装： | 2,500 |
| 功能： | 过压/欠压保护 |
| 电池化学： | 锂离子（Li-Ion） |
| 电源电压： | 5 V ~ 50 V |
| 工作温度： | -20°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-WQFN 裸露焊盘 |
| 供应商设备封装： | 32-TQFN-EP（7x7） |
| 包装： | 带卷 (TR) |
5-Cell to 10-Cell Li+ Protector with
Cell Balancing
Li+ Protection Conditions
Overvoltage, OV. If any cell voltage (V CELL ) exceeds
the overvoltage threshold, V OV , for a period longer than
overvoltage delay, t OVD , the DS2726 shuts off the
external charge FET. When V CELL falls below the
charge-enable threshold V CE , 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 V CELL drops below the undervolt-
age threshold, V UV , for a period longer than undervolt-
age delay, t UVD , 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 V UV_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.
V CELL
Discharge Overcurrent, DOC. If V SNS is less than
V RDOC for a period longer than t DOCD , the DS2726
shuts off the external discharge FET. The discharge
current path is not reestablished until V PKP rises above
V VIN - V TP . The DS2726 provides a test current of value
I TST from the PKP pin to the V IN pin to detect the
removal of the offending low-impedance load. I TST is
not disabled if an undervoltage condition is reached.
Short Circuit, SC. If V SNS is less than V RSC for a peri-
od longer than short-circuit delay t SCD , the DS2726
shuts off the external discharge FET. The discharge
current path is not reestablished until V PKP rises above
V VIN - V TP . The DS2726 provides a test current of value
I TST from the PKP pin to the V IN pin to detect the
removal of the short. I TST 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 )
V OV
V CE
V UV_REL
V UV
CHARGE
V SNS
V IN
V RDOC
V RSC
DISCHARGE
V OHCC
CC
t OVD
t OVD
t UVD
V OLCC
V OHDC
DC
t SCD
t OCD
t UVD
V OLDC
POWER
MODE
Figure 3. Li+ Protection Circuitry Example Waveforms
ACTIVE
SLEEP
10
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相关代理商/技术参数 |
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