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参数资料
| 型号： | LTC4067EDE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 13/20页 |
| 文件大小： | 0K |
| 描述： | IC USB POWER MANAGER 12-DFN |
| 标准包装： | 91 |
| 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： | 5.5V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 12-WFDFN 裸露焊盘 |
| 供应商设备封装： | 12-DFN（4x3） |
| 包装： | 管件 |
LTC4067
OPERATIO
charge current begins to decrease as the LTC4067 enters
constant-voltage mode. Once the battery charger detects
that it has entered constant-voltage mode, the two hour
safety timer is started. After the safety timer expires,
charging of the battery will discontinue and no more cur-
rent will be delivered.
Automatic Recharge
After the battery charger terminates, it will remain off
drawing only microamperes of current from the battery.
If the portable product remains in this state long enough,
the battery will eventually self discharge. To ensure that the
battery is always topped off, a charge cycle will automati-
cally begin when the battery voltage falls below V RECHRG
(typically 4.1V). In the event that the safety timer is run-
ning when the battery voltage falls below V RECHRG , the
timer will reset back to zero. To prevent brief excursions
below V RECHRG from resetting the safety timer, the battery
voltage must be below V RECHRG for more than 1.3ms. The
charge cycle and safety timer will also restart if the IN
UVLO cycles low and then high (e.g. IN is removed and
then replaced).
Charge Current
The charge current is programmed using a single resistor
from PROG to ground. 1/1000th of the battery charge cur-
rent is delivered to PROG which will attempt to servo to
1.000V. Thus, the battery charge current will try to reach
1000 times the current in the PROG pin. The program
resistor and the charge current are calculated using the
following equations:
In many cases, the actual battery charge current, I BAT , will
be lower than I CC-CHG due to limited input current available
and prioritization with the system load drawn from OUT.
Thermal Regulation
To prevent thermal damage to the IC or surrounding
components, an internal thermal feedback loop will
automatically decrease the programmed charge current
if the die temperature rises to approximately 105°C.
Thermal regulation protects the LTC4067 from excessive
temperature due to high power operation or high ambient
thermal conditions and allows the user to push the limits
of the power handling capability with a given circuit board
design without risk of damaging the LTC4067 or external
components. The bene?t of the LTC4067 thermal regula-
tion loop is that charge current can be set according to
actual conditions rather than worst-case conditions with
the assurance that the battery charger will automatically
reduce the current in worst-case conditions.
Low Power Shutdown
The LTC4067 enters a low power shutdown mode if the
PROG pin is pulled above the shutdown threshold, V SD . In
shutdown, the BAT pin current is reduced to 5μA, the IN
pin current is reduced to 10μA, the internal battery charge
timer and end-of-charge comparator output are both reset.
All power paths are put in a high impedance state.
A weak (2.5μA) pull up at the PROG pin causes the LTC4067
to enter low power shutdown if the PROG pin is ?oated. An
external N-channel MOSFET transistor with its drain tied
in series with the PROG pin, or an open drain driver may
R PROG =
1000 V
I CC ? CHG
, I CC ? CHG =
1000 V
R PROG
thereby serve as an enable input for the LTC4067.
NTC
In either the constant-current or constant-voltage charging
modes, the PROG pin voltage will be proportional to the
actual charge current delivered to the battery. Therefore,
the actual charge current can be determined at any time
by monitoring the PROG pin voltage and using the fol-
lowing equation:
Under normal operation, tie a thermistor from the NTC
pin to GND and a resistor of equal value from NTC to IN.
When the voltage on this pin is above 0.74 ? V IN (cold,
0°C) or below 0.29 ? V IN (hot, 50°C) the charge timer is
suspended, but not cleared, the charging is disabled and
the ? C ? H ? R ? G pin ?ashes from Hi-Z to active pull-down with
I BAT =
V PROG
R PROG
? 1000
a serrated pulse. When the voltage on NTC comes back
to between 0.29 ? V IN and 0.74 ? V IN , the charger timer
continues from where it left off, the charging is re-enabled
4067f
13
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4068-4.2 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Standalone Linear Li-Ion Battery Charger with Programmable Termination |
| LTC4068EDD-4.2 | 功能描述:IC BATT CHARGER W/PROG TERM 8DFN 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 |
| LTC4068EDD-4.2#PBF | 功能描述:IC CHARGER BATT LI-ON 8-DFN 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 |
| LTC4068EDD-4.2#TR | 功能描述:IC BATT CHARGER W/PROG TERM 8DFN 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 |
| LTC4068EDD-4.2#TRPBF | 功能描述:IC BATT CHARGER W/PROG TERM 8DFN 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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