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參數(shù)資料
| 型號： | LM3655TLX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, BGA25 |
| 封裝： | 2.5 X 2.5 MM, MICRO SMD, 25 PIN |
| 文件頁數(shù)： | 4/21頁 |
| 文件大小： | 833K |
| 代理商： | LM3655TLX |
11.0 Charge Control Functions (Continued)
12.0 Discharge Control Functions
12.1 GENERAL DESCRIPTION
Depending on the state of charge of the cell (cell voltage), charging and discharging can occur simultaneously. There are two
scenarios: discharge while the charger power supply is connected and discharge while the charger power supply is disconnected.
This will impact the operations of the internal PMOS/NMOS devices and the pass transistor Q1. Figure 5 illustrates the relevant
components of the system.
The charge current will flow through M5 and some current will flow into the cell and some current will flow through M4 and to the
phone. When the charge power supply is not connected the pass transistor Q1 will be turned off and M5 will be off. The current
will be discharged from the cell through M4.
12.2 RADIO+ GENERATION
All current for the phone is sourced through the RADIO_B+ pin. This allows M4 to regulate or disable the battery load current in
the event of an overload condition, internal phone short circuit, or extremely low cell voltage not detected by the phone’s power
management logic.
20111507
FIGURE 4. Peak Detector Response
20111508
FIGURE 5. Circuit Block Diagram
LM3655
www.national.com
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