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| 型号： | LT3650IMSE-8.2#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 12/22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
R SENSE =
V BAT ?
V BAT ? ? 1 ? ? (V ? μs)
R SENSE :ChargeCurrentProgramming
The LT3650 charger is configurable to charge at average
currents as high as 2A. Maximum charge current is set by
choosing an inductor sense resistor such that the desired
maximum average current through that sense resistor
creates a 100mV drop, or:
0.1
I MAX(AVG)
where I MAX(AVG) is the maximum average charge current.
A 2A charger, for example, would use a 0.05Ω sense
resistor.
SW
to 35% of I MAX , so an inductor value can be determined
by setting 0.25 < ?I MAX < 0.35.
Magnetics vendors typically specify inductors with
maximum RMS and saturation current ratings. Select an
inductor that has a saturation current rating at or above
(1+?I MAX /2) ? I MAX , and an RMS rating above I MAX . In-
ductors must also meet a maximum volt-second product
requirement. If this specification is not in the data sheet of
an inductor, consult the vendor to make sure the maximum
volt-second product is not being exceeded by your design.
The minimum required volt-second product is:
?
? V IN(MAX) ?
14
LT3650
BOOST
SENSE
12
10
BAT
R SENSE
8
6
365082 F01
4
Figure 1. Programming Maximum Charge Current Using R SENSE
2
Inductor Selection
0
9
12
15
18
21
24
27
30 32
? 10 ?
? ?I MAX ?
? V BAT + V F ? ?
? ? V IN(MAX) + V F ? ? ?
The primary criteria for inductor value selection in an
LT3650 charger is the ripple current created in that inductor.
Once the inductance value is determined, an inductor must
also have a saturation current equal to or exceeding the
maximum peak current in the inductor. An inductor value
(L), given the desired amount of ripple current (?I MAX )
can be approximated using the relation:
L = ? ? ? R SENSE ? (V BAT + V F )
?
? ? 1 ? ? ? ? (μH)
?
In the previous relation, ?I MAX is the normalized ripple
current, V IN(MAX) as the maximum operational voltage,
and V F is the forward voltage of the rectifying Schottky
diode. Ripple current is typically set within a range of 25%
12
MAXIMUM OPERATIONAL V IN VOLTAGE (V)
365082 F02
Figure 2. 2A Charger Switched Inductor Value
(R SENSE = 0.05Ω) 25% to 35% I MAX Ripple Current
20
18
16
14
12
10
8
6
4
2
0
9 12 15 18 21 24 27 30 32
MAXIMUM OPERATIONAL V IN VOLTAGE (V)
365082 F03
Figure 3. 1.3A Charger Switched Inductor Value
(R SENSE = 0.075Ω) 25% to 35% I MAX Ripple Current
36508284fd
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相关代理商/技术参数 |
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| 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 |
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| 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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