參數(shù)資料
型號(hào)： S-8241
廠商： Seiko Instruments Inc.
英文描述： Lithium-Ion/Lithium Polymer Rechargeable Battery Protection IC(For a Single-Cell Pack)(鋰離子/鋰聚合體可再充電電池保護(hù)芯片(用于單節(jié)電池）)
中文描述： Lithium-Ion/Lithium聚合物可充電電池保護(hù)IC（對(duì)于一個(gè)單細(xì)胞裝）（鋰離子/鋰聚合體可再充電電池保護(hù)芯片（用于單節(jié)電池））
文件頁(yè)數(shù)： 9/22頁(yè)
文件大小： 236K
代理商： S-8241
BATTERY PROTECTION IC
FOR A SINGLE-CELL PACK
S-8241 Series
Rev.1.1
8
Seiko Instruments Inc.
over current 1, over current 2, or load short-circuiting.)
The VM and VSS pins are shorted by the RVMS resistor in the IC under the over current condition.
When a load is connected, the VM pin voltage equals the VDD potential due to the load.
The over current condition returns to the normal condition when the load is released and the
impedance between the EB+ and EB- pins (see Figure 9 for a connection example) is the automatic
recoverable load resistance (see the equation [1] below) or higher. When the load is removed, the
VM pin, which and the VSS pin are shorted with the RVMS resistor, goes back to the VSS potential.
The IC detects that the VM pin potential returns to over current 1 detection voltage (VIOV1) or lower
and returns to the normal condition.
Automatic recoverable load resistance = {Battery voltage / (Minimum value of over current 1
detection voltage) - 1} x (RVMS maximum value) --- [1]
Example: Battery voltage = 3.5 V and over current 1 detection voltage (VIOV1) = 0.1 V
Automatic recoverable load resistance = (3.5 V / 0.07 V -1) x 200k = 9.8M
*Note: The automatic recoverable load resistance is different with the battery voltage and over current 1 detection
voltage settings.
To enable automatic recovery from over current, check the over current 1 detection voltage setting for the IC to
be used, and determine the minimum value of the open load using the above equation [1].
Over charge condition
If the battery voltage becomes higher than the over charge detection voltage (VCU) during charging
under normal condition and it continues for the over charge detection delay time (tCU) or longer, the
charging control FET turns off to stop charging. This condition is called an over charge condition.
The over charge condition is released in two cases ( and ) for each of the products with and
without over charge hysterisis:
Products with over charge hysterisis (Over charge detection voltage (VCU) > Over charge release
voltage (VCL))
If the battery voltage falls below the over charge release voltage (VCL), the charging control FET turns
on and the normal condition returns.
If a load is installed and discharging starts, the charging control FET turns on and the normal condition
returns. The release mechanism is as follows: the discharge current flows through an internal
parasitic diode of the charging FET immediately after a load is installed and discharging starts, and
the VM pin voltage increases by about 0.7 V (Vf voltage of the diode) from the VSS pin voltage
momentarily. The IC detects this voltage (over current 1 detection voltage or higher) and releases the
over charge condition. Consequently, if the battery voltage is equal to or lower than the over charge
detection voltage (VCU), the normal condition returns immediately. If the battery voltage is higher
than the over charge detection voltage (VCU), the normal condition does not return until the battery
voltage falls below the over charge detection voltage (VCU) even if a load is installed. If the VM pin
voltage is equal to or lower than the over current 1 detection voltage when a load is installed and
discharging starts, the normal condition does not return.
!Note:
If the battery is charged to a voltage higher than the over charge detection voltage (VCU) and the battery voltage
does not fall below the over charge detection voltage (VCU) even when a heavy load (which causes an over
current) is installed, detection/delay of over current 1 and over current 2 do not work until the battery voltage
falls below the over charge detection voltage (VCU). However, an actual battery has an internal impedance of
several dozens of m , and the battery voltage drops immediately after a heavy load which causes an over
current is installed, and therefore, detection/delay of over current 1 and over current 2 work. Detection/delay of
load short-circuiting work regardless of the battery voltage.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
S-8241ABAMC-GBA-T2 功能描述:電池管理 4.275V 1-Cell Serial RoHS:否 制造商:Texas Instruments 電池類(lèi)型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel
S-8241ABAMC-GBAT2G 功能描述:電池管理 4.275V 1-Cell Serial RoHS:否 制造商:Texas Instruments 電池類(lèi)型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel
S-8241ABBMC-GBBT2G 功能描述:電池管理 Lithium-Ion battery protection (1 cell) RoHS:否 制造商:Texas Instruments 電池類(lèi)型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel
S-8241ABCMC-GBC-T2 功能描述:電池管理 4.35V Single Cell RoHS:否 制造商:Texas Instruments 電池類(lèi)型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel
S-8241ABCMC-GBCT2G 功能描述:電池管理 4.35V Single Cell RoHS:否 制造商:Texas Instruments 電池類(lèi)型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel
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