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| 型号： | LT3021ES8-1.8#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 12/16页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 1.8V .5A 8-SOIC |
| 产品培训模块： | More Information on LDOs |
| 标准包装： | 2,500 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 1.8V |
| 输入电压： | 最高 10V |
| 电压 - 压降（标准）： | 0.155V @ 500mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 500mA |
| 电流 - 限制（最小）： | 550mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 带卷 (TR) |
LT3021/LT3021-1.2/
LT3021-1.5/LT3021-1.8
APPLICATIONS INFORMATION
The LT3021 regulator has internal thermal limiting (with
hysteresis) designed to protect the device during overload
conditions. For normal continuous conditions, do not ex-
ceed the maximum junction temperature rating of 125°C.
Carefully consider all sources of thermal resistance from
junction to ambient including other heat sources mounted
in proximity to the LT3021.
The underside of the LT3021 DH package has exposed
metal (14mm 2 ) from the lead frame to where the die is
attached. This allows heat to directly transfer from the
die junction to the printed circuit board metal to control
maximum operating junction temperature. The dual-in-line
pin arrangement allows metal to extend beyond the ends
of the package on the topside (component side) of a PCB.
Connect this metal to GND on the PCB. The multiple IN
and OUT pins of the LT3021 also assist in spreading heat
to the PCB.
The LT3021 S8 package has Pin 4 fused with the lead
frame. This also allows heat to transfer from the die to the
printed circuit board metal, therefore reducing the thermal
resistance. Copper board stiffeners and plated through-
holes can also be used to spread the heat generated by
power devices.
The following tables list thermal resistance for several
different board sizes and copper areas for two different
packages. Measurements were taken in still air on 3/32”
FR-4 board with one ounce copper.
Table 1. Measured Thermal Resistance For DH Package
Calculating Junction Temperature
Example: Given an output voltage of 1.2V, an input voltage
range of 1.8V ±10%, an output current range of 1mA to
500mA, and a maximum ambient temperature of 70°C,
what will the maximum junction temperature be for an
application using the DH package?
The power dissipated by the device is equal to:
I OUT(MAX) (V IN(MAX) – V OUT ) + I GND (V IN(MAX) )
where
I OUT(MAX) = 500mA
V IN(MAX) = 1.98V
I GND at (I OUT = 500mA, V IN = 1.98V) = 10mA
so
P = 500mA(1.98V – 1.2V) + 10mA(1.98V) = 0.41W
The thermal resistance is in the range of 35°C/W to 70°C/W
depending on the copper area. So the junction temperature
rise above ambient is approximately equal to:
0.41W(52.5°C/W) = 21.5°C
The maximum junction temperature equals the maximum
junction temperature rise above ambient plus the maximum
ambient temperature or:
T JMAX = 21.5°C + 70°C = 91.5°C
Protection Features
COPPER AREA
THERMAL RESISTANCE
The LT3021 incorporates several protection features
TOPSIDE* BACKSIDE
2500mm 2 2500mm 2
BOARD AREA
2500mm 2
(JUNCTION-TO-AMBIENT)
30°C/W
that make it ideal for use in battery-powered circuits.
In addition to the normal protection features associated
900mm 2
225mm 2
100mm 2
50mm 2
2500mm 2
2500mm 2
2500mm 2
2500mm 2
2500mm 2
2500mm 2
2500mm 2
2500mm 2
35°C/W
50°C/W
55°C/W
65°C/W
with monolithic regulators, such as current limiting and
thermal limiting, the device also protects against reverse-
input voltages, reverse-output voltages and reverse out-
put-to-input voltages.
Table 2. Measured Thermal Resistance For S8 Package
Current limit protection and thermal overload protection
protect the device against current overload conditions at
COPPER AREA
TOPSIDE* BACKSIDE
2500mm 2 2500mm 2
BOARD AREA
2500mm 2
THERMAL RESISTANCE
(JUNCTION-TO-AMBIENT)
70°C/W
the output of the device. For normal operation, do not
exceed a junction temperature of 125°C.
1000mm 2
2500mm 2
2500mm 2
70°C/W
The IN pins of the device withstand reverse voltages of
225mm 2 2500mm 2
100mm 2 2500mm 2
50mm 2 2500mm 2
*Device is mounted on topside.
2500mm 2
2500mm 2
2500mm 2
78°C/W
84°C/W
96°C/W
10V. The LT3021 limits current ?ow to less than 1μA and
no negative voltage appears at OUT. The device protects
both itself and the load against batteries that are plugged
in backwards.
3021fc
12
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