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参数资料
| 型号： | LTC1729CS8-8.4#TR |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封装： | 0.150 INCH, PLASTIC, SO-8 |
| 文件页数： | 3/16页 |
| 文件大小： | 216K |
| 代理商： | LTC1729CS8-8.4#TR |
11
LTC1729 Series
APPLICATIO S I FOR ATIO
WU
UU
Figure 8. Terminate Charging at C/10
Figure 9. Modify C/10 Indication to Create Charging Indicator
OVP
BAT
SENSE
GND
OVP
BAT
SENSE
VCC
VC
STATUS
NTC
VC
VCC
1
2
3
4
8
7
6
5
LTC1729-4.2
1
F
0.1
F
1729 F08
10k NTC THERMISTOR
NTHS1206N02 VISHAY/DALE
200
100
A
1729 F09
–
+
COMP1
LTC1729
SENSE
IBIAS
BAT
+
–
SENSE
RESISTOR
CHARGE
CURRENT
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 VC 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 VCC 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
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.
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