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| 型号： | LT3009ESC8-1.5#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 15/20页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 1.5V 20MA SC70-8 |
| 产品培训模块： | More Information on LDOs |
| 标准包装： | 1 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 1.5V |
| 输入电压： | 最高 20V |
| 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： | 8-VFSOP（0.492"，1.25mm 宽） |
| 供应商设备封装： | SC-70-8 |
| 包装： | 剪切带 (CT) |
| 产品目录页面： | 1330 (CN2011-ZH PDF) |
| 其它名称： | LT3009ESC8-1.5#TRMPBFCT |
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 |
|---|---|
| LT3009ESC8-2.5#PBF | 制造商:Linear Technology 功能描述:LDO Regulator Pos 2.5V 0.02A 8-Pin SC-70 制造商:Linear Technology 功能描述:LDO Regulator Pos 2.5V 0.02A 8-Pin SC-70 Bulk |
| LT3009ESC8-2.5#TRMPBF | 制造商:Linear Technology 功能描述:LDO Regulator Pos 2.5V 0.02A 8-Pin SC-70 |
| LT3009ESC8-2.5#TRPBF | 制造商:Linear Technology 功能描述:LDO Regulator Pos 2.5V 0.02A 8-Pin SC-70 T/R |
| LT3009ESC8-3.3#PBF | 制造商:Linear Technology 功能描述:LDO Regulator Pos 3.3V 0.02A 8-Pin SC-70 制造商:Linear Technology 功能描述:LDO Regulator Pos 3.3V 0.02A 8-Pin SC-70 Bulk |
| LT3009ESC8-3.3#TRMPBF | 功能描述:IC REG LDO 3.3V 20MA SC70-8 RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:1 系列:- 稳压器拓扑结构:正，固定式 输出电压:2.7V 输入电压:最高 5.5V 电压 - 压降（标准）:0.21V @ 150mA 稳压器数量:1 电流 - 输出:150mA 电流 - 限制（最小）:- 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:SOT-23-5 细型，TSOT-23-5 供应商设备封装:TSOT-23-5 包装:剪切带 (CT) 产品目录页面:1100 (CN2011-ZH PDF) 其它名称:576-1852-1 |
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