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参数资料
| 型号： | L6924U |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 电源管理 |
| 英文描述： | POWER SUPPLY SUPPORT CKT, QCC16 |
| 封装： | 3 X 3 MM, ROHS COMPLIANT, VFQFP-16 |
| 文件页数： | 10/38页 |
| 文件大小： | 598K |
| 代理商： | L6924U |
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Applications information: charging process
L6924U
18/38
7.2
Pre-charge phase
The L6924U allows pre-charging the battery with a low current when the battery is deeply
discharged.
The battery is considered deeply discharged when its voltage is lower than a threshold
(VPRETH), internally set to 3 V.
During pre-charge phase, the current (IPRECH) has a default value equal to 10 % of the fast-
charge current.
A safety timer is also present. If the battery voltage does not rise over VPRETH within this
time, a fault is given (Chapter 7.8: Maximum charging time on page 22).
If at the beginning of the charge process, the battery voltage is higher than the VPRETH, the
pre-charge phase is skipped.
7.3
AC or USB mode
The L6924U can charge batteries from both AC adapter and USB inputs.
The choice of the power supply is done by driving the MODE pin.
A low level sets the L6924U in AC mode. The fast charge current is determined by the
connected to IUSB.
The same way, a high level at the MODE pin sets the L6924U in USB mode. The fast charge
Figure 10.
MODE pin selection
I
AC
R
AC
L6924U
MODE
AC adapter mode
R
USB
I
AC
R
AC
L6924U
MODE
USB mode
R
USB
I
USB
V
IN
I
USB
Sets the fast charge current
I
AC
R
AC
L6924U
MODE
AC adapter mode
R
USB
I
AC
R
AC
L6924U
MODE
USB mode
R
USB
I
USB
V
IN
I
USB
Sets the fast charge current
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相关代理商/技术参数 |
参数描述 |
|---|---|
| L6924U013TR | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:USB compatible battery charger system with integrated power switch for Li-Ion/Li-Polymer |
| L6924UTR | 功能描述:电池管理 Battery Charger USB Compatible RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| L6925 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:HIGH EFFICIENCY MONOLITHIC SYNCHRONOUS STEP DOWN REGULATOR |
| L6925013TR | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:HIGH EFFICIENCY MONOLITHIC SYNCHRONOUS STEP DOWN REGULATOR |
| L6925D | 功能描述:直流/直流开关调节器 Synchronous Step-Dwn RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
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