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参数资料
| 型号： | LSP4054CLAD |
| 厂商： | LITE-ON SEMICONDUCTOR CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO5 |
| 封装： | SOT-23, 5 PIN |
| 文件页数： | 2/17页 |
| 文件大小： | 634K |
| 代理商： | LSP4054CLAD |
Liteon Semiconductor Corporation
LSP4054
Standalone Linear Li-ion Battery Charger with Thermal Regulation
Rev1.1
10/17
Reverse Polarity Input Voltage Protection
In some applications, protection from reverse polarity voltage on VCC is desired. If the supply voltage is high
enough, a series blocking diode can be used. In other cases, where the voltage drop must be kept low a Pchannel
MOSFET can be used (as shown in Figure 6).
Figure 6: Low loss input reverse polarity protection
USB and Wall Adapter Power
The LSP4054 allows charging from both a wall adapter and a USB port. Figure 7 shows an example of how to
combine wall adapter and USB power inputs. A P-channel MOSFET, MP1, is used to prevent back conducting into
the USB port when a wall adapter is present and a Schottky diode, D1, is used to prevent USB power loss through
the 1k pull-down resistor.
Typically a wall adapter can supply more current than the 500mA-limited USB port. Therefore, an N-channel
MOSFET, MN1, and an extra 10k program resistor are used to increase the charge current to 600mA when the wall
adapter is present.
Figure 7: Combining wall adapter and USB power
TYPICAL APPLICATIONS
USB/wall adapter power Li-ion charger
Full featured single cell Li-ion charger
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