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参数资料
| 型号： | LSP4054YLAD |
| 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-89, 5 PIN |
| 文件页数： | 12/17页 |
| 文件大小： | 634K |
| 代理商： | LSP4054YLAD |
Liteon Semiconductor Corporation
LSP4054
Standalone Linear Li-ion Battery Charger with Thermal Regulation
Rev1.1
4/17
assurance that the charger will automatically reduce the current in worst-case conditions. ThinSOT power
considerations are discussed further in the Applications Information section.
Undervoltage Lockout UVLO)
An internal undervoltage lockout circuit monitors the input voltage and keeps the charger in shutdown mode until
VCC rises above the undervoltage lockout threshold. The UVLO circuit has a built-in hysteresis of 200mV.
Furthermore, to protect against reverse current in the power MOSFET, the UVLO circuit keeps the charger in
shutdown mode if VCC falls to within 30mV of the battery voltage. If the UVLO comparator is tripped, the charger will
not come out of shutdown mode until VCC rises 100mV above the battery voltage.
Manual shutdown
At any point in the charge cycle, the LSP4054 can be put into shutdown mode by removing RPROG thus floating the
PROG pin. This reduces the battery drain current to less than 2mA and the supply current to less than 50mA. A new
charge cycle can be initiated by reconnecting the program resistor.
In manual shutdown, the CHRG pin is in a weak pull-down state as long as VCC is high enough to exceed the UVLO
conditions. The CHRG pin is in a high impedance state if the LSP4054 is in undervoltage lockout mode: either VCC
is within 100mV of the BAT pin voltage or insufficient voltage is applied to the VCC pin.
Automatic recharge
Once the charge cycle is terminated, the LSP4054 continuously monitors the voltage on the BAT pin using a
comparator with a 2ms filter time (tRECHARGE). A charge cycle restarts when the battery voltage falls below 4.05V
(which corresponds to approximately 80% to 90% battery capacity). This ensures that the battery is kept at or near a
fully charged condition and eliminates the need for periodic charge cycle initiations. CHRG output enters a strong
pulldown state during recharge cycles.
Figure 1:the state diagram of a typical charge cycle
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