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參數(shù)資料
| 型號： | BQ24630RGET |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHED CAPACITOR CONVERTER, PQCC24 |
| 封裝： | 4 X 4 MM, GREEN, PLASTIC, VQFN-24 |
| 文件頁數(shù)： | 16/33頁 |
| 文件大小： | 1893K |
| 代理商： | BQ24630RGET |
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Battery
Inserted
BatterynotDetected
BatteryDetected
tLOWV_DEG tRECH_DEG
tWAKE
VREG
VRECH
VLOWV
(V
)
WAKE
(V
)
DISH
é
ù
ê
ú
DISCH
MAX
2
1
I
t
C
=
R
1.425
1+
R
m
é
ù
ê
ú
MAX
8mA
1sec
C
=
= 930
F
500k
1.425
1+
100k
www.ti.com
SLUS894 – JANUARY 2010
Once the device has powered up, an 8mA discharge current will be applied to the SRN terminal. If the battery
voltage falls below the LOWV threshold within 1 second, the discharge source is turned off, and the charger is
turned on at low charge current (125mA). If the battery voltage gets up above the recharge threshold within
500ms, there is no battery present and the cycle restarts. If either the 500ms or 1 second timer time out before
the respective thresholds are hit, a battery is detected and a charge cycle is initiated.
Figure 22. Battery Detect Timing Diagram
Care must be taken that the total output capacitance at the battery node is not so large that the discharge current
source cannot pull the voltage below the LOWV threshold during the 1 second discharge time. The maximum
output capacitance can be calculated as seen in Equation 10:
(10)
Where CMAX is the maximum output capacitance, IDISCH is the discharge current, tDISCH is the discharge time, and
R2 and R1 are the voltage feedback resistors from the battery to the VFB pin. The 1.425 factor is the difference
between the RECHARGE and the LOWV thresholds at the VFB pin.
EXAMPLE
For a 3-cell LiFePO4 charger, with R2 = 500k, R1 = 100k (giving 10.8V for voltage regulation), IDISCH = 8mA,
tDISCH = 1 second,
(11)
Based on these calculations, no more than 930 mF should be allowed on the battery node for proper operation of
the battery detection circuit.
Copyright 2010, Texas Instruments Incorporated
23
Product Folder Link(s): bq24630
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| BQ24630RGET | 制造商:Texas Instruments 功能描述:BATTERY CHARGER IC |
| BQ24640EVM | 功能描述:電源管理IC開發(fā)工具 Eval Mod for BQ24640 RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| BQ24640RVAR | 功能描述:電池管理 Hi Eff Synch Sw-Mode Batt Charge Cntrlr 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 |
| BQ24640RVAT | 功能描述:電池管理 Hi Eff Synch Sw-Mode Batt Charge Cntrlr 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 |
| BQ24650EVM-639 | 功能描述:電源管理IC開發(fā)工具 BQ24650 Eval Mod RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
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