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参数资料
| 型号： | LTC4066EPF#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 22/28页 |
| 文件大小： | 0K |
| 描述： | IC USB POWER MANAGER 24-UTQFN |
| 标准包装： | 2,500 |
| 功能： | 电源管理 |
| 电池化学： | 锂离子（Li-Ion） |
| 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： | 24-UFQFN 裸露焊盘 |
| 供应商设备封装： | 24-UTQFN-EP（4x4） |
| 包装： | 带卷 (TR) |
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LTC4066/LTC4066-1
APPLICATIONS INFORMATION
Any time a battery is connected to the BAT pin and the
SHDN pin is low, the BAT pin current can be monitored
with the following equation:
voltage should not exceed approximately V BAT – 0.5V (for
the typical minimum operating voltage for the ideal diode
this value would be 2.8V – 0.5V = 2.3V). Typically, it is this
I BAT =
V ISTAT
R ISTAT
? 1000
second case that is the limiting situation since V BAT is typi-
cally lower than V OUT (while charging) and transient ideal
diode loads tend to be greater than typical charge currents
where |I BAT | is the absolute value of the BAT pin current,
V ISTAT is the voltage on the I STAT pin and R ISTAT is the total
resistance from the I STAT pin to ground.
The POL pin has two states: high impedance and strong
pull-down. High impedance indicates that current is ?ow-
ing from BAT to OUT (ideal diode function) and strong
pull-down indicates that current is ?owing from OUT to
BAT (charging). If an external ADC is used to convert the
I STAT voltage, then the POL pin can be thought of as a
sign bit.
When the ideal diode function is operating, the I STAT pin
cannot monitor ideal diode load currents less than about
1mA. For any ideal diode load current less than 1mA, the
I STAT pin will source a constant current of approximately
1μA. However, when the battery charger function is operat-
ing, the I STAT pin will continue to source one-thousandth
of the battery charge current even if the charge current
drops to less than 1mA.
When choosing the value of R ISTAT , two details must be
considered. For the battery charger function, the value of
R ISTAT programs the charge current below which the CHRG
pin transitions to its high impedance state (see CHRG
Status Output Pin). Furthermore, the available common
mode range on the I STAT pin needed to maintain an accurate
(causing a higher voltage on the I STAT pin). Therefore,
choosing a value of R ISTAT based on the CHRG detection
current may limit the maximum ideal diode load current
that can be sensed accurately. Consider an example:
a) Desired charge current = 850mA
b) Desired CHRG detection current = 100mA
c) Maximum transient ideal diode current = 1.5A
Calculate:
a) R PROG = (1V/850mA) ? 50,000 = 59k
b) R ISTAT = 100V/100mA = 1k
c) V ISTAT(MAX) = 1.5A/1000 ? 1k = 1.5V
In this example, there is no common mode problem because
the maximum I STAT voltage (1.5V) is well below the 2.3V
minimum. However, if, instead of 100mA, the desired CHRG
detection current was lowered to 40mA, then the desired
R ISTAT resistor would increase to 2.5k (100V/40mA) and
the maximum I STAT voltage would increase to 3.75V (as-
suming no change in the 1.5A maximum ideal diode cur-
rent). Therefore, ideal diode currents greater than 920mA
(2.3V/2.5k ? 1000) might not be reported accurately. To
calculate the maximum ideal diode current that will be
reported accurately:
ratio between I BAT and I ISTAT is limited. When charging, the
I STAT pin voltage should not exceed approximately V OUT
– 0.5V. When the ideal diode is functioning, the I STAT pin
I DMON ( MAX ) =
V BAT – 0.5 V
R ISTAT
4066fc
22
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| LTC4066EUF#PBF | 功能描述:IC USB POWER MANAGER 24-QFN 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 |
| LTC4066EUF#TRPBF | 功能描述:IC USB POWER MANAGER 24-QFN 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 |
| LTC4066EUF-1#PBF | 功能描述:IC USB POWER MANAGER 24-QFN 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 |
| LTC4066EUF-1#TRPBF | 功能描述:IC USB POWER MANAGER 24-QFN 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 |
| LTC4067 | 制造商:LINER 制造商全称:Linear Technology 功能描述:USB Power Manager with OVP and Li-Ion/Polymer Charger |
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