参数资料
型号: LTC1729CS8-8.2
厂商: Linear Technology
文件页数: 11/16页
文件大小: 0K
描述: IC CTRLR BATT CHRGR LI-ION 8SOIC
标准包装: 100
功能: 充电管理
电池化学: 锂离子(Li-Ion)
工作温度: 0°C ~ 70°C
安装类型: 表面贴装
封装/外壳: 8-SOIC(0.154",3.90mm 宽)
供应商设备封装: 8-SOIC
包装: 管件
LTC1729 Series
APPLICATIO S I FOR ATIO
the NTC pin will float to 5V as soon as the Status pull-down
is open. This will force the state machine into the Hold
mode. The V C pin is pulled low which turns off the charger.
This circuit is shown in Figure 8.
In order to restart the charging process for a new battery,
the NTC pin will need to be momentarily brought below
0.2V or the V CC pin brought below the UVLO threshold.
The automatic battery detection features are disabled
during the Hold mode.
Using Status as a Charging Indicator
In many applications circuits shown in this data sheet, the
STATUS pin is used to indicate when C /10 has occurred
(charge current has dropped to 10% of the full charge
current). This C /10 number is not fixed, but is set by an
external resistor connected to the LTC1729 SENSE pin. A
100 μ A bias current through this resistor develops a volt-
age which is compared with the voltage across the charge
current sense resistor. When these voltages are equal, the
open-drain STATUS pin turns off. Connecting an LED to
the STATUS pin will give a visual indication during the
precondition trickle charge and the portion of the main
charge before C /10 has occurred.
By reducing the LTC1729 SENSE pin resistor to 0 ? , the
STATUS pin function can be changed to a charging indica-
tor (Figure 9). The LED on the STATUS pin will always go
off after the 3-hour charge cycle is completed, regardless
of the C /10 circuitry.
LTC1729-4.2
OVP
BAT
SENSE
200 ?
1
2
1 μ F 3
OVP
BAT
SENSE
V CC
V C
STATUS
8
7
6
V C
0.1 μ F
V CC
4
GND
NTC
5
10k NTC THERMISTOR
NTHS1206N02 VISHAY/DALE
1729 F08
Figure 8. Terminate Charging at C /10
CHARGE
CURRENT
LTC1729
SENSE
I BIAS
100 μ A
+
SENSE
RESISTOR
BAT
COMP1
1729 F09
Figure 9. Modify C /10 Indication to Create Charging Indicator
11
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