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參數(shù)資料
| 型號： | TWL2214CA |
| 英文描述： | High voltage fast-switching NPN power transistor |
| 中文描述： | 電源管理IC和鋰離子電池充電控制 |
| 文件頁數(shù)： | 25/36頁 |
| 文件大?。?/td> | 511K |
| 代理商： | TWL2214CA |
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SLVS321A
–
OCTOBER 2001
–
REVISED JANUARY 2002
25
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
device power supply control (V
DD1
)
The TWL2214CA device receives device power by regulating the V
CHG
input to 4.1 V or 4.2 V, whenever V
CHG
is available; otherwise, the device uses the V
BAT
input directly as device dc supply. The regulated voltage from
V
CHG
is programmable through the I
2
C interface.
BG
VDD
R1
R2
Control
Logic
Decode
VG
VG2
VG3
TWL2214CA
RS
R1: Fixed
R2: Programmable
BG: Band Gap Voltage
_
+
+
–
VDD1
VBAT
VDD
VCHG
Figure 15. Device Power Supply
Condition 1:
V
CHG
is on (VG = Active, VG2 = On, VG3 = Off)
VDD1
4.1 V or 4.2 V
The TWL2214CA device sets R2 value according to the programmed voltage level (4.1 V or 4.2 V).
Condition 2:
V
CHG
is off and V
BAT
applied (VG = High, VG2 = Off, VG3 = On)
VDD1
VBAT
battery charger
The TWL2214CA device provides a charger function for single cell Li-Ion battery packs. The charging activity
starts with the battery pack wake-up cycle. If the wake-up cycle completes successfully, the charger starts the
precharge function and slowly charges the battery to 3.2 V. If the battery is charged to 3.2 V within the time limit,
the charger goes into the fast charge mode. The fast charge mode has two phases: 1) constant current (CC)
mode and 2) constant voltage (CV) mode. The charger starts CC mode with the maximal charging current until
the battery voltage reaches the regulated voltage level; the charger is then switched to CV mode. During the
CV mode, the TWL2214CA device monitors the charging current; once it is below the programmed termination
current level, the charger activity is terminated. The termination current level can be programmed at 10%, 20%,
30%, 40%, or 50% of the maximum charging current at the CC mode.
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