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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)： | 31/36頁 |
| 文件大?。?/td> | 511K |
| 代理商： | TWL2214CA |
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SLVS321A
–
OCTOBER 2001
–
REVISED JANUARY 2002
31
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
VG
VG2
VG3
TWL2214CA
Rsense
Active
ON
OFF
RPRE
Constant
Current
Source
Switch
Control
DC Input
ISENSE
+
–
Precharge Path
Voltage and
Current Regulation
Logic
VDD
VBAT
VCHG
RPR
Figure 19. Precharge Functional Diagram
fast charge constant current (CC mode)
When the battery voltage is 3.2 V or higher, the TWL2214CA device starts the fast charge CC mode cycle. In
CC mode, the charger regulates the charging current to its maximum level. The maximum charging current
(I
MAX
) is determined by the external sense resistor, R
SENSE
, and the voltage, V
SENSE
. V
SENSE
, is programmable
through the I
2
C interface (refer to CSV register for programming information). The range of V
SENSE
is from
100 mV to 200 mV, in 20-mV steps. The CC mode charge time is limited by the CCTR timer.
I
MAX
V
SENSE
R
SENSE
fast charge constant current (CV mode)
When the cell reaches the constant voltage phase, the charger switches to the fast charge CV mode. The
charging current begins tapering down while the charging voltage is regulated at the programmed voltage level
(4.1 V or 4.2 V). The CV mode charging is limited by the TCTR timer.
VG
VG2
VDD
VG3
TWL2214CA
Rsense
Active
ON
ON
ISENSE
+
–
Fast Charge Path (CC, CV)
DC Input
Voltage and
Current Regulation
Logic
Switch
Control
VCHG
VBAT
Figure 20. Fast Charge Functional Diagram
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