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参数资料
| 型号： | DS2726G+T&R |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 9/16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
Detailed Description
The DS2726 provides the protection features for a
5-cell to 10-cell Li+ battery pack. The Li+ protection cir-
cuit allows for pin-configured selection of OV threshold
and the cell-balancing threshold. DOC and SC thresh-
olds and delays are component programmable.
Sleep Mode
Sleep Mode is a low-power state where the FETs are
open and the IC is not monitoring voltages. During
Wake Mode, the IC measures voltages and drives the
FETs to the appropriate state.
Upon initial connection to cells, the DS2726 enters
Sleep Mode. The IC also enters Sleep Mode if a UV
condition is detected. Sleep Mode can be initiated any
time by pulling the SLEEP pin low while a charger-
detect condition does not exist. During Sleep Mode
there is a pulldown current from PKP to GND.
V PKP must be within V TP of V VIN (V PKP > V VIN - V TP ) to
exit wake from Sleep Mode.
When a charger is detected and V CC achieves regula-
tion, the part measures all cells for undervoltage and
overvoltage. Then the IC begins controlling the CC and
DC FETs as shown in Table 1. Care should be taken to
ensure that the SLEEP pin is not held low during a wake
condition.
Charger Detect
The DS2726 has two different methods for detecting a
charger connection. The methods are pin programma-
ble at the CBCFG pin. If CBCFG is pulled to GND, then
charge detection occurs when V PKP > V VIN + V CDET . If
CBCFG is pulled to V CC , then charge detection occurs
when the SLEEP pin is driven to a logic-high state.
Li+ Protection Circuitry
In Active Mode, the DS2726 constantly monitors V00–
V10 to protect the battery from overvoltage and under-
voltage. The voltage on the SNS pin is monitored and
compared to the voltages on RDOC and RSC to protect
against excessive discharge currents (discharge over-
current and short circuit). Table 1 summarizes the con-
ditions that activate the protection circuit, the response
of the DS2726, and the thresholds that release it from a
protection state.
Table 1. Li+ Protection Conditions and DS2726 Responses
CONDITION*
Overvoltage (OV)
THRESHOLD
V CELL > V OV
ACTIVATION
DELAY
t OVD
RESPONSE
CC Off
RELEASE THRESHOLD
V CELL < V CE
CBCFG < V IL and
V CELL < V UV_REL , then
V PKP > V VIN + V CDET (Note 13)
Undervoltage (UV)
(Note 15)
V CELL < V UV
t UVD
CC Off, DC Off,
Sleep Mode
CBCFG < V IL and
V CELL > V UV_REL , then
V PKP > V VIN - V TP
CBCFG > V IH then
SLEEP > V IH and
V PKP > V VIN - V TP
Discharge Overcurrent
(DOC) (Note 15)
Short Circuit (SC)
V SNS < V RDOC
V SNS < V RSC
t DOCD
t SCD
DC Off
DC Off
V PKP > V VIN - V TP (Note 14)
V PKP > V VIN - V TP (Note 15)
*All voltages are with respect to GND. CC Off: V CC = V PKP , DC Off: V DC = V VIN .
Note 13: The DC FET remains off until V CELL > V UV_REL .
Note 14: With test current I TST flowing from V IN to PKP.
Note 15: If a DOC condition persists indefinitely and a UV condition is reached, the IC does not enter Sleep Mode.
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