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| 型号： | LTC4009CUF-2#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | BATTERY CHARGE CONTROLLER, 633 kHz SWITCHING FREQ-MAX, PQCC20 |
| 封装： | 4 X 4 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, MO-220WGGD-1, QFN-20 |
| 文件页数： | 17/28页 |
| 文件大小： | 351K |
| 代理商： | LTC4009CUF-2#TRPBF |
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LTC4009
LTC4009-1/LTC4009-2
4009fd
PCB Layout Considerations
To prevent magnetic and electrical field radiation and
high frequency resonant problems, proper layout of the
components connected to the LTC4009 is essential. Refer
to Figure 12. For maximum efficiency, the switch node
rise and fall times should be minimized. The following
PCB design priority list will help insure proper topology.
Layout the PCB using this specific order.
1. Input capacitors should be placed as close as possible
to switching FET supply and ground connections with
the shortest copper traces possible. The switching
FETs must be on the same layer of copper as the input
capacitors. Vias should not be used to make these
connections.
2. Place the LTC4009 close to the switching FET gate
terminals, keeping the connecting traces short to
producecleandrivesignals.ThisrulealsoappliestoIC
supply and ground pins that connect to the switching
FET source pins. The IC can be placed on the opposite
side of the PCB from the switching FETs.
3. Place the inductor input as close as possible to the
switchingFETs.Minimizethesurfaceareaoftheswitch
node. Make the trace width the minimum needed to
support the programmed charge current. Use no cop-
per fills or pours. Avoid running the connection on
multiplecopperlayersinparallel.Minimizecapacitance
from the switch node to any other trace or plane.
4. Place the charge current sense resistor immediately
adjacent to the inductor output, and orient it such
that current sense traces to the LTC4009 are not long.
These feedback traces need to be run together as a
single pair with the smallest spacing possible on any
given layer on which they are routed. Locate any filter
component on these traces next to the LTC4009, and
not at the sense resistor location.
5. Place output capacitors adjacent to the sense resistor
output and ground.
6. Output capacitor ground connections must feed into
the same copper that connects to the input capacitor
ground before connecting back to system ground.
7. Connection of switching ground to system ground,
or any internal ground plane, should be single-point.
If the system has an internal system ground plane,
a good way to do this is to cluster vias into a single
star point to make the connection.
8. RouteanaloggroundasatracetiedbacktotheLTC4009
GND paddle before connecting to any other ground.
Avoid using the system ground plane. A useful CAD
technique is to make analog ground a separate ground
net and use a 0
Ω resistor to connect analog ground
to system ground.
9. A good rule of thumb for via count in a given high
current path is to use 0.5A per via. Be consistent when
applying this rule.
Figure 12. High Speed Switching Path
4009 F12
VBAT
L1
RSENSE
HIGH
FREQUENCY
CIRCULATING
PATH
BAT
ANALOG
GROUND
SYSTEM
GROUND
SWITCH NODE
CIN
SWITCHING GROUND
COUT
VIN
GND
D1
+
applicaTions inForMaTion
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4009CUF-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Effi ciency, Multi-Chemistry Battery Charger |
| LTC4009CUF-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Effi ciency, Multi-Chemistry Battery Charger |
| LTC4009IUF#PBF | 功能描述:IC CHARGER BATTERY MC 20-QFN 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) |
| LTC4009IUF#TRPBF | 功能描述:IC CTLR BATT CHARGER 20QFN 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) |
| LTC4009IUF-1#PBF | 功能描述:IC CHARGER BATTERY MC 20-QFN 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) |
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