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参数资料
| 型号： | LTC4062EDD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 12/20页 |
| 文件大小： | 0K |
| 描述： | IC BATT CHARGER LI-ION 10-DFN |
| 标准包装： | 2,500 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子（Li-Ion） |
| 电源电压： | 4.3 V ~ 8 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-WFDFN 裸露焊盘 |
| 供应商设备封装： | 10-DFN（3x3） |
| 包装： | 带卷 (TR) |
LTC4062
APPLICATIO S I FOR ATIO
Programming Charge Termination
The LTC4062 can terminate a charge cycle using one of
I DETECT =
R PROG
10 R DET
? I CHG =
100 V
R DET
or
several methods, allowing the designer considerable flex-
ibility in choosing an ideal charge termination algorithm.
Table 1 shows a brief description of the different termina-
R DET =
100 V
I DETECT
TIME ( HOURS ) =
C TIMER
0 . 1 μ F
tion methods and their behaviors.
Charge Time Termination
Connecting a capacitor (C TIMER ) to the TIMER pin enables
the timer and selects charge time termination. The total
charge time is set by:
? 3 HOURS
When the programmed time has elapsed, the charge cycle
terminates and the charger enters standby mode. Subse-
quent recharge cycles terminate when 50% of the pro-
grammed time has elapsed. The I DET pin determines the
behavior of the CHRG output. Connecting a resistor (R DET )
from the I DET pin to ground sets the charge current
detection threshold, I DETECT :
Table 1
When the charge current (I BAT ) is greater than
I DETECT , the CHRG output is in its pull-down state. When
the charger enters constant voltage mode operation and
the charge current falls below I DETECT , the CHRG output
becomes high impedance, indicating that the battery is
almost fully charged. The CHRG output will also become
high impedance once the charge time elapses. If the I DET
pin is not connected, the CHRG output remains in its pull-
down state until the charge time elapses and terminates
the charge cycle.
Figure 2 shows a charger circuit using charge time termi-
nation that is programmed to charge at 500mA. Once the
charge current drops below 100mA in constant voltage
mode (as set by R DET ), the CHRG output turns off the LED.
This indicates to the user that the battery is almost fully
charged and ready to use. The LTC4062 continues to
METHOD
Charge
Time
Termination
TIMER
0.1μF to
GND
I DET
R DET to
GND
CHARGER DESCRIPTION
Charges for 3 Hours. After 3 Hours, the Charger
Stops Charging and Enters Standby Mode.
Recharge Cycles Last for 1.5 Hours.
CHRG OUTPUT DESCRIPTION
Pull-Down State While I BAT > I DET . High Impedance
State While I BAT < I DETECT or When Charging Is Stopped.
Pulsing State Available When NTC Is Used and
Mode
Is Still Charging.
0.1μF to
GND
NC
Charges for 3 Hours. After 3 Hours, the Charger
Stops Charging and Enters Standby Mode.
Recharge Cycles Last for 1.5 Hours.
Pull-Down State When Charging. High Impedance State
When Charging Is Stopped. Pulsing State Available
When NTC Is Used and Is Still Charging.
Charge
Current
GND
R DET to
GND
Charges Until Charge Current Drops Below
I DET , Then Enters Standby Mode.
Pull-Down State When Charging. High Impedance State
When Charging Is Stopped. Pulsing State Available
Termination
When NTC Is Used and Is Still Charging.
GND
NC
Charges Indefinitely.
Pull-Down State When Charging. High Impedance State
When Charging Is Stopped. Pulsing State Available
When NTC Is Used and Is Still Charging.
User
Selectable
V CC
R DET to
GND
Charges Indefinitely.
SmartStart Is Disabled.
Pull-Down State While I BAT > I DETECT . High Impedance
State While I BAT < I DETECT or When Charging Is Stopped.
Charge
Termination
Pulsing State Available When NTC Is Used and
Is Still Charging.
V CC
NC
Charges Indefinitely.
SmartStart Is Disabled.
Pull-Down State When Charging. High Impedance State
When Charging Is Stopped. Pulsing State Available
When NTC Is Used and Is Still Charging.
4062fb
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