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| 型号： | LT3650IMSE-8.2#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 13/22页 |
| 文件大小： | 0K |
| 描述： | IC CHARGER LI-ION 8.2V 2A 12MSOP |
| 标准包装： | 37 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子（Li-Ion）、锂聚合物（Li-Pol） |
| 电源电压： | 9 V ~ 32 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 12-TSSOP （0.118"，3.00mm 宽）裸露焊盘 |
| 供应商设备封装： | 12-MSOP，裸露焊盘 |
| 包装： | 管件 |
LT3650-8.2/LT3650-8.4
APPLICATIONS INFORMATION
I DIODE(MAX) >
I MAX ? (V IN(MAX) ? V BAT(PRE) )
R CLP =
RectifierSelection
The rectifier diode in an LT3650 battery charger provides a
current path for the inductor current when the main power
switch is disabled. The rectifier is selected based upon
forward voltage, reverse voltage, and maximum current.
A Schottky diode is required, as low forward voltage yields
the lowest power loss and highest efficiency. The rectifier
diode must be rated to withstand reverse voltages greater
than the maximum V IN voltage.
The minimum average diode current rating (I DIODE(MAX) ) is
calculated with maximum output current (I MAX ), maximum
operational V IN , and output at the precondition threshold
(V BAT(PRE) ):
(A)
V IN(MAX)
For example, a rectifier diode for an 8.2V, 1.5A charger
with a 20V maximum input voltage would require:
CLP: System Current Limit
The LT3650 contains a PowerPath TM control feature to
support multiple load systems. The charger adjusts out-
put current in response to a system load if overall input
supply current exceeds the programmed maximum value.
Maximum input supply current is set by choosing a sense
resistor (R CLP ) such that the desired maximum current
through that sense resistor creates a 50mV drop, or:
0.05
I MAX(IN)
where I MAX(IN) is the maximum input current. A 1.5A sys-
tem limit, for example, would use a 33mΩ sense resistor.
The LT3650 integrates the CLP signal internally, so aver-
age current limiting is performed in most cases without
the need for external filter elements.
I DIODE(MAX) >
1.5 ? (20 ? 5.65)
20
,or
I DIODE(MAX) > 1.1A
1.5A
SYSTEM LOAD
CURRENT
INPUT SUPPLY
R CLP
SYSTEM LOAD
V IN
1.0A
LT3650 INPUT
CURRENT (I VIN )
LT3650
0.5A
CLP
365082 F04
Figure 4. R CLP Sets the Input Supply Current Limit
365082 F05
Figure 5. CLP Limit: Charger Current vs
System Load Current with 1.5A Limit
36508284fd
13
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3651 | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Voltage High Current Controller for Battery Charging and Power Management |
| LT3651-4.1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Monolithic 4A High Voltage Monolithic 4A High Voltage |
| LT3651-4.2 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Monolithic 4A High Voltage Li-Ion Battery Charger |
| LT3651-8.2 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Monolithic 4A HIgh Voltage 2-Cell Li-Ion Battery Charger |
| LT3651-8.4 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Monolithic 4A HIgh Voltage 2-Cell Li-Ion Battery Charger |
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