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| 型号： | LTC1729CS8-8.2 |
| 厂商： | Linear Technology |
| 文件页数： | 8/16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
For a battery that has been deeply discharged, the LTC1729
provides a 12mA start-up current. This preconditioning
trickle charge begins when the battery voltage drops
below 2.7V/cell. Comparator COMP3 is used to determine
when this condition exists. The battery operating range is
summarized in Figure 4.
With a 10k negative TC thermistor connected to the NTC
pin, the LTC1729 will disable charging if the temperature
is not in the 0 ° C to 50 ° C range. A thermistor must be
present at this pin, or if the temperature qualification
feature is not used, a 10k resistor must be used in its place.
This pin should not be left open. The NTC thermistor
monitoring circuits consist of COMP4, COMP5 and COMP6.
The NTC pin voltage range is shown in Figure 5.
Comparators COMP4 and COMP5 signal the logic when
the temperature is below 0 ° C or above 50 ° C. The 100 μ A
bias current through the 10k ? thermistor will generate
2.79V at 0 ° C and 0.405V at 50 ° C. The voltage hysteresis
on COMP4 and COMP5 is designed to give 10 ° C of
temperature hysteresis. If the voltage on the NTC pin
drops below 0.2V, the comparator COMP6 generates a
reset to the logic and timer block.
To provide accurate charge voltages, the internal resistor
divider is trimmed to provide a precise ± 0.2% voltage of
2.465V at the OVP pin for the four battery voltage options
of 4.1V, 4.2V, 8.2V and 8.4V.
When the input supply is removed in step-down charger
designs, the V CC pin does not drop to 0V, but is held to a
diode drop below the battery voltage. This is due to the
internal parasitic diode from the SW pin to the V CC pin that
is present in the LT1510, LT1511, LT1769, and the body
diode of the top MOSFET in the LT1505 charger. Remov-
ing the input supply will result in the V CC pin dropping
below the UVLO threshold, thus shutting down the LTC1729
and minimizing battery drain. Once the input supply is
connected, the LTC1729 resets the timers and begins
another charge cycle. There is a disconnect transistor that
will remove the OVP resistor divider from the battery when
the V CC voltage drops below the UVLO threshold.
If external circuitry is connected directly to the V CC pin and
the input power is removed, battery current will flow
through the charger’s internal parasitic diode (SW pin to
V CC pin), discharging the battery and possibly damaging
the charger if currents greater than 1A are present. If
external circuitry is used, connect it directly to the input
power source (which is the anode of the input Schottky
diode).
The logic and timer block consists of a state machine,
oscillator and counter. The state machine will be dis-
cussed in detail in the next section. The oscillator is
internally trimmed to 131kHz. The counter is composed of
a chain of 25 flip-flops that includes self-test circuitry.
HOLD MODE
2.79V
V MAX = 1V
V MIN = 0V
4.5V/CELL
V MAX = 0V
V MIN = 0V
2.7V/CELL
V MAX = 0V
V MIN = 1V
BATTERY CLAMP
PULL-DOWN
ON
NORMAL CHARGE
TRICKLE CHARGE
PRECONDITIONING
NORMAL CHARGE
0.405V
HOLD MODE
0.2V
RESET MODE
8
Figure 4. BAT Voltage Operating Range
1729 F04
1729 F05
Figure 5. NTC Voltage Operating Range
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| LTC1730EGN-4#TR | 功能描述:IC BATT PULSE CHRGR LI-ION16SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:61 系列:- 功能:电源管理 电池化学:锂离子（Li-Ion）、锂聚合物（Li-Pol） 电源电压:4.35 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:22-WFDFN 裸露焊盘 供应商设备封装:22-DFN（6x3）裸露焊盘 包装:管件 |
| LTC1730EGN-4#TRPBF | 功能描述:IC BATT PULSE CHRGR LI-ION16SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:61 系列:- 功能:电源管理 电池化学:锂离子（Li-Ion）、锂聚合物（Li-Pol） 电源电压:4.35 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:22-WFDFN 裸露焊盘 供应商设备封装:22-DFN（6x3）裸露焊盘 包装:管件 |
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