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| 型号： | SI9730ABY-T1-E3 |
| 厂商： | Vishay Siliconix |
| 文件页数： | 13/15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
Four Cell Application
Figure 9 shows a method for using the Si9730 in a 4-cell
application. Basically, this is two complete 2-cell circuits
stacked in series. Each half of the complete circuit monitors
its own 2-cell portion of the battery, and opens its own MOS-
FET switch under any of the appropriate conditions. Observe
that the total percent power loss in this circuit is identical to
that in the 2-cell application; although there are now two sets
of MOSFETs in series, there is also double the battery volt-
age, and so total efficiency is the same.
One novel feature of this 4-cell circuit is the increase in the
size of the bypass capacitors. Each half of the circuit retains
its own output cap, to reduce noise seen by the circuit. Since
the two halves interact with each other (when one opens its
switch, the other one is also opened), there can be additional
noise, which must be rejected for proper operation. The
capacitors have been increased to 100 μF for this reason;
remember that they must be rated to take the full maximum
voltage rating of the charger, not half of it, since if one switch
is closed and the other open, the charger (minus two cells’
voltage drop, which might be zero) is applied across the
other capacitor.
A second addition on this circuit is the (optional) two zeners,
one each for each Si9730, placed from V DD to V M . These are
necessary only if the charger voltage is higher than the 15 V
absolute maximum of the IC plus two cells’ voltage drop. Just
as with the capacitor, if one switch is open and the other
closed, the IC will see this charger voltage, and must be pro-
tected. The power rating of the zener can be inferred by
Si9730
observing that the current through it is limited by the 100 Ω
resistor. A trade off can be made here between the power
rating of the zener, which can be decreased by increasing
the resistor value, and the accuracy of the voltage measure-
ment by the Si9730, which can be increased by decreasing
the resistor value.
Reset from Shutdown
There are two specialized conditions that can place the
Si9730 in shutdown mode. The first condition can occur
when the circuit is first attached to a battery in the factory.
When the IC comes up, it will be in the undervoltage shut-
down mode. The Si9730 may also enter this mode when the
ambient temperature drops and the battery is nearly in UV.
When the temperature drops, the battery pack voltage will
drop and the IC may enter the shutdown mode. In either
case, the Si9730 must be reset by raising the V SS pin higher
than the V M pin by V CPHD . Figure 10 shows a circuit that
resets the circuit once it has entered the shutdown mode.
The circuit works by initially connecting the 0.1 μF capacitor
to the battery’s center tap and placing the switch in position
#1. Although the MOSFETs are open, the 1 m Ω resistor is
sufficient to allow the capacitor to charge up in about 300 -
400 msec. Once the capacitor is charged, the switch is
placed in position #2, momentarily making V SS higher than
V M , thus placing the Si9730 in the normal operating mode.
The entire circuit provides a leakage of only a few micro-
amps, which is much lower than the self discharge current of
the LiIon battery.
1 V M
DCO
8
#2
#1
2 N C
V SS 7
3 V DD
I S 6
SPDT
4 C D
V C
5
15 M Ω
1 M Ω
0.1 μF
Figure 10. Factory Startup Circuit
Vishay Siliconix maintains worldwide manufacturing capability. Products may be manufactured at one of several qualified locations. Reliability data for Silicon Tech-
nology and Package Reliability represent a composite of all qualified locations. For related documents such as package/tape drawings, part marking, and reliability
data, see http://www.vishay.com/ppg?70658 .
Document Number: 70658
S-40135-Rev. F, 16-Feb-04
www.vishay.com
13
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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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