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| 型号： | LT1763CS8-3.3#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 18/22页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 3.3V .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： | 3.3V |
| 输入电压： | 最高 20V |
| 电压 - 压降（标准）： | 0.3V @ 500mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 500mA |
| 电流 - 限制（最小）： | 520mA |
| 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) |
LT1763 Series
APPLICATIONS INFORMATION
Table 2. SO-8 Package, 8-Lead SO
Protection Features
COPPER AREA
TOPSIDE* BACKSIDE
BOARD AREA
THERMAL RESISTANCE
(JUNCTION-TO-AMBIENT)
The LT1763 regulators incorporate several protection
features which make them ideal for use in battery-powered
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
60°C/W
60°C/W
68°C/W
74°C/W
86°C/W
circuits. In addition to the normal protection features
associated with monolithic regulators, such as current
limiting and thermal limiting, the devices are protected
against reverse input voltages, reverse output voltages
and reverse voltages from output to input.
* Device is mounted on topside
Calculating Junction Temperature
Example: Given an output voltage of 3.3V, an input voltage
range of 4V to 6V, an output current range of 0mA to 250mA
and a maximum ambient temperature of 50°C, what will
the maximum junction temperature be?
The power dissipated by the device will be equal to:
I OUT(MAX) (V IN(MAX) – V OUT ) + I GND (V IN(MAX) )
where,
I OUT(MAX) = 250mA
V IN(MAX) = 6V
I GND at (I OUT = 250mA, V IN = 6V) = 5mA
So,
P = 250mA(6V – 3.3V) + 5mA(6V) = 0.71W
The thermal resistance will be in the range of 60°C/W to
86°C/W, depending on the copper area. So, the junction
temperature rise above ambient will be approximately
equal to:
0.71W(75°C/W) = 53.3°C
The maximum junction temperature will then be equal to
the maximum junction temperature rise above ambient
plus the maximum ambient temperature, or :
T JMAX = 50°C + 53.3°C = 103.3°C
Current limit protection and thermal overload protection
are intended to protect the device against current overload
conditions at the output of the device. For normal operation,
the junction temperature should not exceed 125°C.
The input of the device will withstand reverse voltages of
20V. Current ?ow into the device will be limited to less
than 1mA (typically less than 100μA) and no negative
voltage will appear at the output. The device will protect
both itself and the load. This provides protection against
batteries which can be plugged in backward.
The output of the LT1763-X can be pulled below ground
without damaging the device. If the input is left open-circuit
or grounded, the output can be pulled below ground by
20V. For ?xed voltage versions, the output will act like a
large resistor, typically 500k or higher, limiting current ?ow
to less than 100μA. For adjustable versions, the output
will act like an open circuit; no current will ?ow out of the
pin. If the input is powered by a voltage source, the output
will source the short-circuit current of the device and will
protect itself by thermal limiting. In this case, grounding
the SHDN pin will turn off the device and stop the output
from sourcing the short-circuit current.
The ADJ pin of the adjustable device can be pulled above
or below ground by as much as 7V without damaging the
device. If the input is left open-circuit or grounded, the
ADJ pin will act like an open circuit when pulled below
ground and like a large resistor (typically 100k) in series
with a diode when pulled above ground.
In situations where the ADJ pin is connected to a resistor
divider that would pull the ADJ pin above its 7V clamp
voltage if the output is pulled high, the ADJ pin input current
must be limited to less than 5mA. For example, a resistor
divider is used to provide a regulated 1.5V output from the
1.22V reference when the output is forced to 20V.
1763fg
18
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相关代理商/技术参数 |
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|---|---|
| LT1763CS8-3PBF | 制造商:Linear Technology 功能描述:LDO Regulator Positive 3V 0.5A SOIC8 |
| LT1763CS8-3-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:500mA, Low Noise, LDO Micropower Regulators |
| LT1763CS8-3TR | 制造商:LINER 制造商全称:Linear Technology 功能描述:500mA, Low Noise, LDO Micropower Regulators |
| LT1763CS8-3-TR | 制造商:LINER 制造商全称:Linear Technology 功能描述:500mA, Low Noise, LDO Micropower Regulators |
| LT1763CS8-3TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:500mA, Low Noise, LDO Micropower Regulators |
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