參數(shù)資料
型號(hào)： L6924U
廠商： STMICROELECTRONICS
元件分類： 電源管理
英文描述： POWER SUPPLY SUPPORT CKT, QCC16
封裝： 3 X 3 MM, ROHS COMPLIANT, VFQFP-16
文件頁(yè)數(shù)： 4/38頁(yè)
文件大?。?/td> 598K
代理商： L6924U
Operation description
L6924U
12/38
Figure 5.
Li-Ion charging profile
6.1
Linear mode
When operating in linear mode, the device works in a way similar to a linear regulator with a
constant current limit protection.
It charges the battery in three phases:
●
Pre-charging current ("pre-charge" phase).
●
Constant current ("fast-charge" phase).
●
Constant voltage ("voltage regulation" phase).
VADP is the output voltage of the upstream AC-DC adapter that is, in turn, the input voltage
of the L6924U. If the battery voltage is lower than the default pre-charge voltage (VPRETH),
the pre-charge phase takes place. The battery is pre-charged with a low current , internally
set to 10 % of the fast charge current.
When the battery voltage goes higher than VPRETH, the battery is charged with the fast
charge current (IUSB or IAC according to the selection of the MODE pin).
Finally, when the battery voltage is close to the regulated output voltage (4.2 V), the voltage
regulation phase takes place and the charging current is reduced. The charging process
ends when the charging current reaches the programmed value (IENDTH) or when the
charging timer expires.
Figure 6 shows the different phases.
0.000
0.050
0.100
0.150
0.200
0.250
0.300
0.350
0.400
0.450
0.500
0
200
400
600
800
1000
1200
Charging time (sec)
Ich
g
(A
)
0.000
0.500
1.000
1.500
2.000
2.500
3.000
3.500
4.000
4.500
Vb
a
tt
(V
)
Ichg
Vbatt
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L6924U013TR 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:USB compatible battery charger system with integrated power switch for Li-Ion/Li-Polymer
L6924UTR 功能描述:電池管理 Battery Charger USB Compatible 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
L6925 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:HIGH EFFICIENCY MONOLITHIC SYNCHRONOUS STEP DOWN REGULATOR
L6925013TR 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:HIGH EFFICIENCY MONOLITHIC SYNCHRONOUS STEP DOWN REGULATOR
L6925D 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 Synchronous Step-Dwn RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
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