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| 型号： | SI9730ABY-T1-E3 |
| 厂商： | Vishay Siliconix |
| 文件页数： | 8/15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) |
Si9730
Vishay Siliconix
Product is End of Life 3/2014
Over-Discharged Cell(s) Charging
If one or both cells is over-discharged, and a charger is pres-
ent, charging can begin, and so the Si9730 closes the switch.
However, removal of the charger in this condition could
potentially damage the battery if the removal is not recog-
nized and the cells are discharged. Since the voltage drop
across the switch is small, the Si9730 actually cycles the
switch at a 7/8 duty cycle; during the 1/8 time when the
switch is open, the IC checks that the charger is still present.
Once both cells are back into the normal operating range,
normal charging resumes.
Undervoltage Charging
If for some reason the battery drops below about 3.7 V
(V UVL ), there is insufficient voltage for the Si9730 to properly
monitor fault conditions. Of course, the switch is already
open, since V UVL < V ODC x 2. However, when a charger is
detected, the Si9730 recovers and goes into an undervoltage
mode. (A charger is detected if the V S pin is higher than the
V M pin by at least V CHPD = 1.1 V, see Figure 6). In this under-
voltage mode, the switch is on at a 1/8 duty cycle, to limit the
power dissipation across the switch, and, again, to detect the
continuing presence of the charger.
Once the battery voltage is above V UVL , the charging contin-
ues in the over-discharged state.
Output Short
If too much current is drawn from the battery due to a load
short, the switch must be opened quickly to prevent damage
to the battery. The Si9730 monitors the load current by look-
ing at the voltage across an external sense resistor (see Fig-
ure 8). If the voltage across the sense resistor exceeds
V ILIMIT ~ 28 mV, the switch is opened. The Si9730 leaves the
switch open until the load is completely removed.
Of course, the IC must have some way of detecting that the
load has been removed. For this purpose, a small current
(I VMSHORT ) passes through the Si9730, from pin V M to pin
V SS once the short is detected and the switch is turned off.
The I VMSHORT current causes the voltage on the V M pin to
equal the voltage on the V DD pin while the short is present,
or the voltage on the V M pin to equal the voltage on the V SS
pin if the short is removed. If the short is not removed, I VMS-
HORT current will continue to flow until the battery voltage
becomes overdischarged. Once the short is removed, the IC
is allowed to turn the switch back on.
The current limit threshold has a temperature coefficient of
0.18 %/°C. This can partially compensate for a copper circuit
board trace being used as the sense resistor.
www.vishay.com
8
Open Center Tap
An open center tap is a mechanical failure of the battery pack
such that the Si9730’s V C pin is disconnected from the center
point of the two-cell battery. If this connection is open, the IC
opens the switch, as it cannot measure the cell voltages in
this condition. The switch is left open until connection is re-
established. If the battery is under-voltaged and the charger
is present in this case, the battery is allowed to charge even
with the center tap open. In this state, batteries are almost
impossible to damage by 1/8 duty cycle charging. Once the
battery voltage reaches the over-discharged voltage, the
switch is turned off.
State Transition Table
The number of different states of the Si9730 can seem over-
whelming at first. This state transition table will help to orga-
nize thinking about the different operational conditions of the
IC, by listing each possible transition from one condition to
another.
Reading the table is straightforward. There are two cells con-
stituting the battery, one with its positive terminal connected
to V DD and its negative terminal connected to V C , referred to
as the high cell (see Figure 8); and one cell with its positive
terminal connected to V C and its negative terminal con-
nected to V SS , referred to as the low cell. Each cell can be in
one of three voltages:
? Over-discharge (ODC), where V CELL < V ODC ;
? Normal Operation (NO), where
V ODC < V CELL < V OC ;
or
? Overcharge (OC), where V OC < V CELL .
Additionally, the battery as a whole can be undervoltage
(UV), where V BATTERY < V UVL . Note that this final condition
is not necessarily (though normally) mutually exclusive with
the other cell conditions: if one cell were at 0 V, the other cell
could be in NO, and the battery could still be in UV.
The charger can be either present (ON) or not present (OFF);
the "X" in the table means the condition is true regardless of
the state of the charger. The load current can be either 0,
normal (0 < I LOAD < I ILIMIT ) or a short (I ILIMIT < I LOAD ) where
I ILIMIT is set by V ILIMIT /R SENSE ; the "X" in the table refers to
a load current that can be either 0 or normal. Finally, the
switch can be either ON, OFF, or cycling at either 1/8 or 7/8
duty cycle, where the duty cycle refers to the portion of the
period when the switch is on; the notation On->On simply
means that the switch does not change state, it remains on;
the notation ->Off means that the switch turns off regardless
of its previous state.
Document Number: 70658
S-40135-Rev. F, 16-Feb-04
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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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