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參數(shù)資料
| 型號： | SI9731DB |
| 廠商： | Vishay Intertechnology,Inc. |
| 英文描述： | UP Controlled Battery Charger For 1-Cell Li-ion or 1-Cell to 3-Cell NiCd/NiMH Batteries |
| 中文描述： | 向上控制電池充電器1節(jié)鋰離子電池或1節(jié)至3節(jié)鎳鎘/鎳氫電池 |
| 文件頁數(shù)： | 9/9頁 |
| 文件大?。?/td> | 68K |
| 代理商： | SI9731DB |
Si9731
Vishay Siliconix
Document Number: 71321
S-02258
—
Rev. A, 28-Sep-00
www.vishay.com
9
4.1 V
TAP
The Si9731
’
s internal feedback resistors are set to provide
4.2-V charge termination at V
BAT+
output if the 4.1 V
TAP
is left
open circuit. Connecting the 4.1 V
TAP
to V
BAT+
configures
Si9731 for 4.1-V charge termination at V
BAT+
. This feature
allows Si9731 to accommodate Li-ion batteries requiring 4.1-V
or 4.2-V charge termination. Caution : the 4.1 V
TAP
should not
be connected to ground or any other voltage source as this will
cause the Si9731 to operate open loop and can result in over
charging the battery!
Feedback Disconnect Switch
The Si9731 includes a feedback disconnect switch (Q5 in
Figure 1) connected in series with the device
’
s internal
feedback resistor string. The 42-k feedback resistor string is
connected to ground when both the internal
“
OK to Charge
”
signal and the CVMODE pin are at logic high, providing
feedback voltage to Si9731
’
s error amplifier. This action helps
prevent the Si9731 from discharging the battery.
CHARGERPRESENT and CHARGERPOWERON
CHARGERPRESENT and CHARGERPOWERON are open
drain outputs, each requiring an external pull-up resistor.
CHARGERPRESENT
pin
CHARGERPRESENTIN pin goes high, signaling the processor
that a charger has been inserted. CHARGERPOWERON Pin
goes low when CHARGERPOWERONIN Pin is high, charger
voltage is not in UVLO and the battery voltage has increased to
above 3.4 V, turning on the system power supply since the battery
has been charged up to minimum operating voltage.
goes
low
with
Input Over-Voltage Detector
The external dc source connected to the V
CHARGER
pin should
be at 12 V or less. In the unlikely event that the voltage at
V
CHARGER
pin is at or above 12.8 V (typical), Si9731
’
s internal
over voltage detector will turn off MOSFETs Q1, Q2,and Q5
and disable charging.
Thermal Shutdown
Si9731 also includes a thermal protection circuit that suspends
charging through Q1 and Q2 when die temperature exceeds
130 C due to overheating. Once the die temperature cools to
below 120 C, the charging will resume.
Shutdown
Si9731 can be completely turned off by applying 0.4 V or less
to the device
’
s ON/OFF pin. In shutdown mode, Si9731 draws
less than 1- A quiescent current with charger voltage below
UVLO, and draws 500 A when charger voltage is above
UVLO. The device is enabled by applying 1.5 V to 12 V at the
ON/OFF pin. In applications where the device will always
remain enabled, the ON/OFF pin may be connected to the
V
CHARGER
pin. Si9731
’
s shutdown circuitry includes
hysteresis, as such the device will operate properly even if a
slow moving signal is applied to the ON/OFF pin. When the
device is enabled, the battery voltage sense circuitry draws
approximately 25 A from V
BAT
.
OK to Charge (OTC)
Si9731 also includes an internal signal that enables both trickle
charge mode and fast charge mode operations, the
“
OK to
Charge
”
(or OTC) signal. The OTC signal is at logic high if all of
the following are satisfied:
1. Battery voltage is below 5 V
2. Charger voltage is greater than 2.6 V but below 12.8 V
3. V
CHARGER
V
BAT
+ 40 mV when MAINCHARGEEN =
Low
V
CHARGER
V
BAT
–
40 mV when MAINCHARGEEN =
High
4. ON/OFF pin is at logic high.
In order to charge the battery in any manner, the OTC signal
has to be high.
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| SI9731DQ | 制造商:VISHAY 制造商全稱:Vishay Siliconix 功能描述:uP Controlled Battery Charger for 1-Cell Li-ion or 1-Cell to 3-Cell NiCd/NiMH Batteries |
| SI9731DQ-T1 | 功能描述:電池管理 Battery Charger 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 |
| SI9731DQ-T1-E3 | 功能描述:電池管理 Micro Controlled Battery Charger 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 |
| SI9731SB | 功能描述:電池管理 SI9731 System Board 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 |
| SI9750 | 制造商:VISHAY 制造商全稱:Vishay Siliconix 功能描述:In-Rush Current Limit MOSFET Driver |
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