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參數(shù)資料
| 型號(hào)： | Si9730 |
| 廠商： | Vishay Intertechnology,Inc. |
| 英文描述： | Dual-Cell Lithium Ion Battery Control IC(兩節(jié)鋰電池充電控制芯片) |
| 中文描述： | 雙鋰離子電池控制IC（兩節(jié)鋰電池充電控制芯片） |
| 文件頁數(shù)： | 8/13頁 |
| 文件大小： | 355K |
| 代理商： | SI9730 |
Si9730
Vishay Siliconix
S-60752—Rev. D, 05-Apr-99
8
FaxBack 408-970-5600, request 70658
www.siliconix.com
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 undervoltage 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
continues 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 looking
at the voltage across an external sense resistor (see
Figure 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 completelyremoved.
Of course, the IC must have some way of detecting that the
load hasbeen 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
VMSHORT
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.
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
overwhelming at first. This state transition table will help to
organize 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
constituting 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
connected 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 0V, 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.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SI9730ABY | 功能描述:電池管理 Battery Controller RoHS:否 制造商:Texas Instruments 電池類型: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 |
| SI9730ABY-E3 | 功能描述:電池管理 Li Batt Controller 4.15-4.25V OC Detect RoHS:否 制造商:Texas Instruments 電池類型: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 |
| SI9730ABY-T1 | 功能描述:電池管理 Li Batt Controller 4.15-4.25V OC Detect RoHS:否 制造商:Texas Instruments 電池類型: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 |
| SI9730ABY-T1-E3 | 功能描述:電池管理 Li Batt Controller 4.15-4.25V OC Detect RoHS:否 制造商:Texas Instruments 電池類型: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 |
| SI9730BBY | 功能描述:電池管理 Battery Controller RoHS:否 制造商:Texas Instruments 電池類型: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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