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| 型号： | SI9730ABY-T1-E3 |
| 厂商： | Vishay Siliconix |
| 文件页数： | 7/15页 |
| 文件大小： | 0K |
| 描述： | IC CONTROLLR LI-ION 4.2V 8SOIC |
| 标准包装： | 2,500 |
| 功能： | 双电池控制器 |
| 电池化学： | 锂离子（Li-Ion） |
| 工作温度： | -25°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOICN |
| 包装： | 带卷 (TR) |
Product is End of Life 3/2014
Si9730
Vishay Siliconix
DETAILED DESCRIPTION
Overview
The purpose of the Si9730 is to safely and reliably control the
charging and discharging of a two-cell lithium-ion battery
(carbon or coke chemistry). It provides protection against all
possible fault conditions, including:
Normal Discharging
The cells are in normal discharging conditions if a, b, and c
above are satisfied, and if in addition d) the load current is
less than the discharge current limit. With no charger pres-
ent, the switch will be on, discharging the cells and powering
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external short circuits
reversed charger
overcharged cell or cells
undervoltage
battery open center-tap
the load.
Overcharged Cell(s) Charging
The most destructive condition that a LiI+ cell can experience
is overcharging. If the cell becomes overcharged beyond its
recommended limits, it can become permanently disabled.
General Concepts
The Si9730 operates by connecting or disconnecting the
negative terminal of the battery to the negative side of the
load and/or charger (see Figure 8); that is, it does ground
side switching. It is important to bear the distinction between
these two "grounds" in mind in order to understand the oper-
ation of the Si9730. The switching is accomplished by con-
trolling two "back-to-back" MOSFETs: having the two
MOSFETs in this arrangement is mandatory to ensure that
current cannot flow in either direction when the MOSFETs
are off. To turn the switch on, the Si9730 applies a gate-
source voltage to both MOSFETs (from the DCO pin) that is
high with respect to the sources. The Si9730 DCO signal is
referenced to the V M pin while the battery is being charged,
and to the Vss pin while the battery is being discharged. The
Si9730 causes the DCO to be referenced to the lower of the
two voltages. This prevents the switch from turning on or off
unintentionally.
The Si9730 is designed to operate only with a current-limited
lithium-ion battery charger. Specifically, the battery charger
must have an open-circuit voltage that does not exceed the
absolute maximum IC voltage, and it must have a limited
short-circuit current that does not exceed the allowed
charging current of the battery.
The following descriptions cover all the common operational
scenarios; additional information on unusual battery condi-
tions can be found in the state transition table.
Normal Charging
The cells are in normal charging conditions if a) both cells are
above the Over-Discharge Detect Threshold (V ODC ~ 2.2 V);
b) both cells are under the Over-Charge Detect Threshold
(V OC ~ 4.2 V); and c) the center tap is connected to the V C
pin. When a charger is present in these conditions, the switch
will be on, charging the cells at the current limit of the char-
ger.
Document Number: 70658
S-40135-Rev. F, 16-Feb-04
If one or both cells rise above the over-charge detect thresh-
old (V OC1 and V OC2 ), and a charger is present, the Si9730
will open the switch (to prevent further charging) and begin
bleeding off charge (15 μA typical) from the overcharged cell
or cells.
The details of this operation depend on the fact that the volt-
age level of lithium-ion batteries drops for a short time after
charging ceases (due to momentary changes in battery
chemistry, ESR, etc.). Because of this recovery, the Si9730
allows the battery to continue charging for a short time (the
overcharge time, t DL2OC ). This additional charge time only
occurs if the overcharge condition persists for more than
8 msec (two periods of an internal 4msec oscillator). T DL2OC
is determined by the capacitor attached to the C D pin, see
Figure 8.
Once the overcharge time has ended, the switch is opened,
preventing the battery from further overcharging. Now, the
Si9730 begins bleeding current off the overcharged cell or
cells (I BAL1 and I BAL2 ), as long as a charger is present. Even-
tually, the cell(s) will return into their normal range, and
charging will begin, starting the whole cycle over again.
Overcharged Cell(s) Discharging
If one or more cells is overcharged, and a load is connected,
the switch is turned on, permitting the battery to power the
load.
Over-Discharged Cell(s) Discharging
Repeated over-discharging of LiI+ cells can cause irrevers-
ible reactions in the cells which lead to decreased cycle life.
To avoid this, if one or both cells becomes over-discharged
(V CELL < V ODC ) and no charger is present, the Si9730 opens
the switch to prevent further discharging, and goes into a
shutdown mode in which it draws minute power from the bat-
tery (I DD_UVL < 1 μA).
www.vishay.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SI9730BBY | 功能描述:电池管理 Battery Controller 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 |
| SI9730BBY-E3 | 功能描述:电池管理 Li Batt Controller 4.20-4.30V OC Detect 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 |
| SI9730BBY-T1 | 功能描述:电池管理 Li Batt Controller 4.20-4.30V OC Detect 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 |
| SI9730BBY-T1-E3 | 功能描述:电池管理 Li Batt Controller 4.20-4.30V OC Detect 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 |
| SI9730CBY | 功能描述:电池管理 Battery Controller 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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