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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)： | 11/14頁(yè) |
| 文件大小： | 649K |
| 代理商： | LP3947 |
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Application Notes
(Continued)
MODE PIN
The mode pin toggles the LP3947 between the AC adaptor
mode and the USB mode. When CHG-IN is connected to a
USB port, this pin must be set low. When CHG-IN is con-
nected to an AC adaptor, this pin must be tied high to either
the BATT pin or to the wall adaptor input. Caution: MODE pin
should never be tied to CHG-IN pin directly, as it will turn on
an internal diode.
5.6 HR SAFETY TIMER IN CHARGER MODE
The LP3947 has a built-in 5.6 hr back up safety timer to
prevent over-charging a Li Ion battery. The 5.6 hr timer starts
counting when the charger enters the constant current
mode. It will turn the charger off when the 5.6 hr timer is up
while the charger is still in constant current mode. In this
case, both LEDs will turn on, indicating a fault condition.
When the battery temperature is outside the specified tem-
perature range, the 5.6 hr safety timer will reset upon recov-
ery of the battery temperature.
I
2
C INTERFACE
I
2
C interface is used in the LP3947 to program various
parameters as shown in
Table 3
. The LP3947 operates on
default settings following power up. Once programmed, the
LP3947 retains the register data as long as the battery
voltage is above 2.85V.
20111010
FIGURE 5. Power Up Timing Diagram in Charger Mode (1.39V
<
Ts
<
2.427V)
20111011
FIGURE 6. Power Up Timing Diagram in LDO Mode (Ts
≥
2.7V)
L
www.national.com
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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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