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| 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： | 11/38页 |
| 文件大小： | 598K |
| 代理商： | L6924U |
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L6924U
Applications information: charging process
19/38
7.4
Fast charge phase
When the battery voltage reaches the pre-charge voltage threshold (VPRETH), the L6924U
enters the fast-charge phase.
In this phase the device charges the battery with a constant current, whose value can be set
by external resistors connected to IAC pin (AC adapter mode selected) or to IUSB pin (USB
mode) with an accuracy of 7 %.
In AC adapter mode (MODE pin low), the resistor RAC can be calculated as:
Equation 6
Where VBG is the internal reference equal to 1.23 V, whereas KPRG is a constant equal to
9500.
Figure 11.
IAC pin connection
In USB mode (MODE pin high), the resistor RUSB can be selected as:
Equation 7
Where VBG and KPRG have the same meaning and value above mentioned.
The charge current in USB mode depends on RUSB as well as the state of the ISEL pin.
When this pin is high, the “high-power” USB mode is selected and the charge current is
determined by the equation 7.
The charge current in USB mode should be set in accordance with the typical USB current
capability (up to 500 mA). If ISEL is low, the “low-power” USB mode is selected and the
charge current is a fifth of the high-power USB mode charge current (up to 100 mA)
During low power USB mode operation, since the charge current is reduced by one fifth, the
maximum charging time is proportionally increased (Section 7.8: Maximum charging time).
PRG
AC
BG
AC
K
I
V
R
=
PRG
USB
BG
USB
K
I
V
R
=
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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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