参数资料
| 型号： | LT1965EQ-3.3#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 15/22页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 3.3V 1.1A 5-DDPAK |
| 产品培训模块： | More Information on LDOs |
| 标准包装： | 50 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 3.3V |
| 输入电压： | 最高 20V |
| 电压 - 压降（标准）： | 0.31V @ 1.1A |
| 稳压器数量： | 1 |
| 电流 - 输出： | 1.1A |
| 电流 - 限制（最小）： | 1.2A |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-263-6，D²Pak（5 引线+接片），TO-263BA |
| 供应商设备封装： | D2PAK-5 |
| 包装： | 管件 |
| 产品目录页面： | 1330 (CN2011-ZH PDF) |
LT1965 Series
APPLICATIONS INFORMATION
The following tables list thermal resistance for several
different board sizes and copper areas. All measurements
were taken in still air on a 2-layer 1/16" FR-4 board with
one ounce copper.
Table 1. Measured Thermal Resistance for DFN Package
Calculating Junction Temperature
Example: Given an output voltage of 2.5V, an input volt-
age range of 3.3V ± 5%, an output current range of 0mA
to 500mA and a maximum ambient temperature of 85°C,
what will the maximum junction temperature be?
Copper Area
Topside* Backside
Board Area
Thermal Resistance
(Junction-to-Ambient)
The power dissipated by the device equals:
1000mm
225mm
2500mm 2
2
2
2500mm 2
2500mm 2
2500mm 2
2500mm 2
2500mm 2
2500mm 2
60°C/W
62°C/W
65°C/W
I OUT(MAX) ? ( V IN(MAX) – V OUT ) + I GND ? V IN(MAX)
where:
2500mm 2
50mm
100mm 2 2500mm 2
2
*Device is mounted on topside
2500mm 2
2500mm 2
68°C/W
70°C/W
I OUT(MAX) = 500mA
V IN(MAX) = 3.465V
Table 2. Measured Thermal Resistance for MSOP Package
I GND at (I OUT = 500mA, V IN = 3.465V) = 8.2mA
Copper Area
Topside* Backside
2500mm 2 2500mm 2
Board Area
2500mm 2
Thermal Resistance
(Junction-to-Ambient)
55°C/W
So,
P = 500mA(3.465V – 2.5V) + 8.2mA(3.465V) = 0.511W
2500mm 2
2500mm 2
1000mm
57°C/W
2500mm 2
2500mm 2
225mm
60°C/W
2500mm 2
2500mm 2
50mm
68°C/W
2
2
100mm 2 2500mm 2 2500mm 2 65°C/W
2
*Device is mounted on topside
Table 3. Measured Thermal Resistance for DD-Pak Package
Copper Area Thermal Resistance
Topside* Backside Board Area (Junction-to-Ambient)
2500mm 2 2500mm 2 2500mm 2 25°C/W
Using a DFN package, the thermal resistance will be in
the range of 60°C/W to 70°C/W depending on the cop-
per area. So the junction temperature rise above ambient
approximately equals:
0.511W ? 65° C/W = 33.22°C
The maximum junction temperature equals the maximum
ambient temperature plus the maximum junction tempera-
ture rise above ambient or:
1000mm 2
125mm 2
2500mm 2
2500mm 2
2500mm 2
2500mm 2
30°C/W
35°C/W
T JMAX = 85°C + 33.22°C = 118.22°C
*Device is mounted on topside
Measured Thermal Resistance for TO-220 Package
Thermal Resistance (Junction-to-Case) = 3°C/W
Protection Features
The LT1965 regulators incorporate several protection
features that makes them ideal for use in battery-powered
circuits. In addition to the normal protection features
associated with monolithic regulators, such as current
limiting and thermal limiting, the devices also protect
against reverse-input voltages, reverse-output voltages
and reverse output-to-input voltages.
Current-limit protection and thermal overload protection
protect the device against current overload conditions
at its output. For normal operation, do not exceed the
maximum rated junction temperature of 125°C (LT1965E,
LT1965I) or 150°C (LT1965H).
15
For more information www.linear.com/LT1965
1965fb
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