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參數(shù)資料
| 型號(hào)： | LP3947 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | USB/AC Adaptor, Single Cell Li-Ion Battery Charger IC |
| 中文描述： | 的USB / AC適配器，單節(jié)鋰離子電池充電器IC |
| 文件頁(yè)數(shù)： | 7/14頁(yè) |
| 文件大?。?/td> | 649K |
| 代理商： | LP3947 |
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Application Notes
LP3947 CHARGER OPERATION
The LP3947 charge cycle is initiated withAC adaptor or USB
power source insertion. If the voltage on the CHG-IN pin
meets under-voltage (V
UVLO-TSHD
), over-voltage (V
OVLO-
TSHD
) requirements, and the Adaptor OK signal is detected,
then pre-qualification cycle begins (see
Figure 1
). In this
cycle, a safe current level, less than 70mA, is pumped into
the battery while the voltage across the battery terminals is
measured. Once this voltage exceeds 3.0V, the controller
will initiate constant current fast charge cycle. If the CHG-IN
pin is connected to anAC adaptor, the default charge current
is 500 mA and I
2
C interface can be used to program this
parameter. If the CHG-IN pin is connected to the USB port,
constant current cycle will start with a default of 100 mA.
During this cycle, the 5.6 hr safety timer starts counting.
If the 5.6 hr safety timers times out during constant current
cycle, charging is terminated. As the battery is charged
during constant current mode, the voltage across pack ter-
minal increases until it reaches 4.2V (or 4.1V). As soon as
pack terminal reaches 4.2V (or 4.1V), the controller starts
operating in constant voltage mode by applying regulated
V
voltage across the battery terminals. During this cycle,
the charge current, I
, continues to decrease with time
and when it drops below 0.1C (default value), the EOC
signal is activated indicating successful completion of the
charge cycle. The EOC current can be programmed to 0.1C,
0.15C, or 0.2C. The default value is 0.1C. After completing
the full charge cycle, the controller will start the maintenance
cycle where battery pack voltage is monitored continuously.
During the maintenance cycle, if the pack voltage drops 200
mV below the termination voltage, charge cycle will be initi-
ated providing that the wall adaptor is plugged in and is alive.
Charging terminates when the battery temperature is out of
range. For more explanation, please refer to “Ts Pin” section.
The LP3947 with I
2
C interface allows maximum flexibility in
selecting the charge current, battery regulation voltage and
EOC current. The LP3947 operates in default mode during
power up. See the “I
2
C Interface” section for more detail.
When charging source comes from the USB port, charging
starts with 100 mA (low power mode, ISEL = high). The USB
controller can set the ISEL pin low to charge the battery at
500 mA. A simple external circuit selects between an AC
adaptor or the USB port. The circuit is designed with priority
given to the AC adaptor.
20111006
FIGURE 2. LP3947 with External Switch
L
www.national.com
7
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LP3947ISD-09 | 功能描述:電池管理 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 |
| LP3947ISD-09/NOPB | 功能描述:電池管理 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 |
| LP3947ISD-51 | 功能描述:電池管理 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 |
| LP3947ISD-51/NOPB | 功能描述:電池管理 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 |
| LP3947ISD-51EV | 功能描述:電源管理IC開發(fā)工具 LP3947 EVAL BOARD RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
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