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參數(shù)資料
| 型號(hào)： | BQ24901 |
| 英文描述： | Fast Recovery Bridge Rectifiers |
| 中文描述： | 單細(xì)胞Li-Ion/Li-Pol脫機(jī)應(yīng)用充電器（小方控制）采用TSSOP - 14 |
| 文件頁數(shù)： | 9/16頁 |
| 文件大?。?/td> | 227K |
| 代理商： | BQ24901 |
SLUS527
–
DECEMBER 2002
9
www.ti.com
APPLICATION INFORMATION
Charge Qualification and Pre-Conditioning
The bq24901 starts a charge cycle when power is applied and a battery is present. Charge qualification is based
on battery temperature and voltage. The device suspends charge if the battery temperature is outside the V
LTF
to V
HTF
and waits until the battery temperature is within the allowed range. The device also checks the battery
voltage. If the battery voltage is below the low-voltage threshold, V
LOWV
, the device use pre-conditioning
current, I
PRECHG
, to charge the battery.
Temperature Sense (TS) Input
The bq24901 continuously monitors battery temperature by measuring the voltage between the TS pin and Vss.
A negative temperature coefficient thermistor (NTC) and an external voltage divider typically develop this
voltage. The bq24901 compares this voltage against its internal thresholds to determine if charging is allowed.
To initiate a charge cycle, the battery temperature must be within the V
LTF
to V
HTF
thresholds. If battery
temperature is outside of this range, the device suspends charge and waits until the battery temperature is within
the V
LTF
to V
HTF
range. During the charge cycle (both pre-charge and fast charge) the battery temperature must
be within the V
LTF
to V
TCO
thresholds. If battery temperature is outside of this range, the bq24901 suspends
charge and waits until the battery temperature is within the V
LTF
to V
HTF
range. The device suspends charge
by turning off the CC pin and holding the timer value (i.e. timers are not reset during a suspend condition).
Figure 4 summarizes this operation.
Charge Suspend
Temperature Range
to Initiate Charge
Charge Suspend
Charge Suspend
Temperature Range
During Charge Cycle
Charge Suspend
VLTF
VHTF
VTCO
VCC
VSS
Figure 4. Temperature Sense Input Thresholds
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| BQ24901PW | 功能描述:電池管理 1Cell Li-Ion 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 |
| BQ24901PWG4 | 功能描述:電池管理 1Cell Li-Ion 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 |
| BQ24901PWR | 功能描述:電池管理 1Cell Li-Ion 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 |
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| BQ25 | 制造商:Newport Electronics Inc 功能描述:DIGITAL PANEL PROCESS METER; Leaded Process Compatible:No; Peak Reflow Compatible (260 C):No ;RoHS Compliant: No |
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