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| 型号： | LT3650EMSE-8.4#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 12/22页 |
| 文件大小： | 0K |
| 描述： | IC BATTERY CHARGER LI 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 |
| 产品目录页面： | 1340 (CN2011-ZH PDF) |
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 |
参数描述 |
|---|---|
| LT3650IDD-4.1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Voltage 2 Amp Monolithic Li-Ion Battery Charger |
| LT3650IDD-4.1#PBF | 功能描述:IC CHARGER LI-ION 2A 12-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 其它有关文件:STC3100 View All Specifications 特色产品:STC3100 - Battery Monitor IC 标准包装:4,000 系列:- 功能:燃料，电量检测计/监控器 电池化学:锂离子（Li-Ion） 电源电压:2.7 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 供应商设备封装:8-MiniSO 包装:带卷 (TR) 其它名称:497-10526-2 |
| LT3650IDD-4.1#TRPBF | 功能描述:IC CHARGER LI-ION 4.1V 2A 12-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 功能:电池监控器 电池化学:碱性，锂离子，镍镉，镍金属氢化物 电源电压:1 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:带卷 (TR) |
| LT3650IDD-4.1PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Voltage 2 Amp Monolithic Li-Ion Battery Charger |
| LT3650IDD-4.1TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Voltage 2 Amp Monolithic Li-Ion Battery Charger |
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