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参数资料
| 型号： | S-8241ABZPN-KBZ-TFG |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO5 |
| 封装： | SON-5 |
| 文件页数： | 6/32页 |
| 文件大小： | 1009K |
| 代理商： | S-8241ABZPN-KBZ-TFG |
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BATTERY PROTECTION IC FOR 1-CELL PACK
S-8241 Series
Rev.4.1_01
Seiko Instruments Inc.
14
Overcharge Condition
When the battery voltage becomes higher than the overcharge detection voltage (VCU) during charging under
normal condition and the state continues for the overcharge detection delay time (tCU) or longer, the S-8241
turns the charging control FET off to stop charging. This condition is called the overcharge condition.
The overcharge condition is released in the following two cases (
and
) depending on the products with
and without overcharge hysteresis:
Products with overcharge hysteresis (overcharge detection voltage (VCU) > overcharge release voltage
(VCL))
When the battery voltage drops below the overcharge release voltage (VCL), the S-8241 turns the
charging control FET on and returns to the normal condition.
When a load is connected and discharging starts, the S-8241 turns the charging control FET on and
returns to the normal condition. The release mechanism is as follows: the discharging current flows
through an internal parasitic diode of the charging FET immediately after a load is connected and
discharging starts, and the VM pin voltage increases about 0.7 V (Vf voltage of the diode) from the VSS
pin voltage momentarily. The IC detects this voltage (being higher than the overcurrent 1 detection
voltage) and releases the overcharge condition. Consequently, in the case that the battery voltage is
equal to or lower than the overcharge detection voltage (VCU), the IC returns to the normal condition
immediately, but in the case the battery voltage is higher than the overcharge detection voltage (VCU),
the IC does not return to the normal condition until the battery voltage drops below the overcharge
detection voltage (VCU) even if the load is connected. In addition If the VM pin voltage is equal to or
lower than the overcurrent 1 detection voltage when a load is connected and discharging starts, the IC
does not return to the normal condition.
Remark If the battery is charged to a voltage higher than the overcharge detection voltage (VCU) and the battery voltage
does not drops below the overcharge detection voltage (VCU) even when a heavy load, which causes an
overcurrent, is connected, the overcurrent 1 and overcurrent 2 do not work until the battery voltage drops
below the overcharge detection voltage (VCU). Since an actual battery has, however, an internal impedance of
several dozens of m
, and the battery voltage drops immediately after a heavy load which causes an
overcurrent is connected, the overcurrent 1 and overcurrent 2 work. Detection of load short-circuiting works
regardless of the battery voltage.
Products without overcharge hysteresis (Overcharge detection voltage (VCU) = Overcharge release voltage
(VCL))
When the battery voltage drops below the overcharge release voltage (VCL), the S-8241 turn the
charging control FET on and returns to the normal condition.
When a load is connected and discharging starts, the S-8241 turns the charging control FET on and
returns to the normal condition. The release mechanism is explained as follows : the discharging
current flows through an internal parasitic diode of the charging FET immediately after a load is
connected and discharging starts, and the VM pin voltage increases about 0.7 V (Vf voltage of the
diode) from the VSS pin voltage momentarily. Detecting this voltage (being higher than the
overcurrent 1 detection voltage), the IC increases the overcharge detection voltage about 50 mV, and
releases the overcharge condition. Consequently, when the battery voltage is equal to or lower than
the overcharge detection voltage (VCU)
+ 50 mV, the S-8241 immediately returns to the normal condition. But the battery voltage is higher
than the overcharge detection voltage (VCU) + 50 mV, the S-8241 does not return to the normal
condition until the battery voltage drops below the overcharge detection voltage (VCU) + 50 mV even if
a load is connected. If the VM pin voltage is equal to or lower than the overcurrent 1 detection voltage
when a load is connected and discharging starts, the S-8241 does not return to the normal condition.
Remark If the battery is charged to a voltage higher than the overcharge detection voltage (VCU) and the battery voltage
does not drop below the overcharge detection voltage (VCU) + 50 mV even when a heavy load, which causes an
overcurrent, is connected, the overcurrent 1 and overcurrent 2 do not work until the battery voltage drops bellow
the overcharge detection voltage (VCU) + 50 mV. Since an actual battery has, however, an internal impedance
of several dozens of m
, and the battery voltage drops immediately after a heavy load which causes an
overcurrent is connected, the overcurrent 1 and overcurrent 2 work. Detection of load short-circuiting works
regardless of the battery voltage.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| S-8241ACAMC-GCAT2G | 功能描述:电池管理 Lithium-Ion battery protection (1 cell) RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| S-8241ACAPN-KCATFG | 制造商:Seiko Instruments Inc (SII) 功能描述:BATTERY PROT LI-ION/LI-POL 4.28V 5PIN SON(A) - Tape and Reel |
| S-8241ACBMC-GCBT2G | 功能描述:电池管理 Lithium-Ion battery protection (1 cell) RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| S-8241ACDMC-GCDT2G | 功能描述:电池管理 Lithium-Ion battery protection (1 cell) RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| S-8241ACEMC-GCET2G | 功能描述:电池管理 Lithium-Ion battery protection (1 cell) RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
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