参数资料
| 型号： | LT3009IDC#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 15/20页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO ADJ 20MA 6-DFN |
| 产品培训模块： | More Information on LDOs |
| 标准包装： | 500 |
| 稳压器拓扑结构： | 正，可调式 |
| 输出电压： | 0.6 V ~ 19.5 V |
| 输入电压： | 1.6 V ~ 20 V |
| 电压 - 压降（标准）： | 0.28V @ 20mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 20mA |
| 电流 - 限制（最小）： | 22mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 6-WFDFN 裸露焊盘 |
| 供应商设备封装： | 6-DFN-EP（2x2） |
| 包装： | 带卷 (TR) |
LT3009 Series
APPLICATIONS INFORMATION
BOARD
THERMAL RESISTANCE
The following tables list thermal resistance for several dif-
ferent board sizes and copper areas. All measurements
were taken in still air on 3/32" FR-4 board with one ounce
copper.
Table 2: Measured Thermal Resistance for DC Package
COPPER AREA
TOPSIDE* BACKSIDE AREA (JUNCTION-TO-AMBIENT)
Calculating Junction Temperature
Example: Given an output voltage of 3.3V, an input volt-
age range of 12V ±5%, an output current range of 0mA
to 20mA and a maximum ambient temperature of 85°C,
what will the maximum junction temperature be for an
application using the DC package?
The power dissipated by the device is equal to:
2500mm 2
1000mm 2
225mm 2
100mm 2
50mm 2
2500mm 2
2500mm 2
2500mm 2
2500mm 2
2500mm 2
2500mm 2
2500mm 2
2500mm 2
2500mm 2
2500mm 2
65°C/W
70°C/W
75°C/W
80°C/W
85°C/W
I OUT(MAX) (V IN(MAX) – V OUT ) + I GND (V IN(MAX) )
where,
I OUT(MAX) = 20mA
V IN(MAX) = 12.6V
*Device is mounted on the topside.
Table 3: Measured Thermal Resistance for SC70 Package
I GND at (I OUT = 20mA, V IN = 12.6V) = 0.45mA
So,
COPPER AREA
TOPSIDE* BACKSIDE
BOARD
AREA
THERMAL RESISTANCE
(JUNCTION-TO-AMBIENT)
P = 20mA(12.6V – 3.3V) + 0.45mA(12.6V) = 191.7mW
2500mm 2
1000mm 2
225mm 2
100mm 2
50mm 2
2500mm 2
2500mm 2
2500mm 2
2500mm 2
2500mm 2
2500mm 2
2500mm 2
2500mm 2
2500mm 2
2500mm 2
75°C/W
80°C/W
85°C/W
90°C/W
95°C/W
The thermal resistance will be in the range of 65°C/W to
85°C/W depending on the copper area. So the junction
temperature rise above ambient will be approximately
equal to:
0.1917W(75°C/W) = 14.4°C
*Device is mounted on the topside.
The maximum junction temperature equals the maximum
junction temperature rise above ambient plus the maximum
ambient temperature or:
T J(MAX) = 85°C + 14.4°C = 99.4°C
3009fd
15
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3009IDC-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:3μA IQ, 20mA Low Dropout Linear Regulators |
| LT300-AC | 制造商:ABB Low Voltage Products and Systems 功能描述:TERMINAL SHROUD,A210-A300 |
| LT300-AL | 制造商:ABB Control 功能描述:TERM SHROUD,A210-300,COMPR. |
| LT300-B | 制造商:Itox, Inc. 功能描述:UATXINTEL 945GC,LGA775,DDR2 400/533/667,PCI-EX16, 3PCI - Bulk |
| LT300-EN | 功能描述:钳型万用表及配件 100-280V SNGL PHASE Hi Current Loop Tstr RoHS:否 制造商:Fluke 准确性:2 % 测距:400 A |
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