参数资料
型号: LT3085IDCB#TRPBF
厂商: Linear Technology
文件页数: 16/28页
文件大小: 0K
描述: IC REG LDO ADJ .5A 6-DFN
产品培训模块: More Information on LDOs
标准包装: 2,500
稳压器拓扑结构: 正,可调式
输出电压: 可调
输入电压: 1.2 V ~ 36 V
电压 - 压降(标准): 1.35V @ 500mA
稳压器数量: 1
电流 - 输出: 500mA
电流 - 限制(最小): 500mA
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 8-WFDFN 裸露焊盘
供应商设备封装: 8-DFN-EP(3x3)
包装: 带卷 (TR)
LT3085
APPLICATIONS INFORMATION
The power in the output transistor equals:
P OUTPUT = (V IN – V OUT )(I OUT )
The total power equals:
P TOTAL = P DRIVE + P OUTPUT
The current delivered to the SET pin is negligible and can
be ignored.
V CONTROL(MAX CONTINUOUS) = 3.630V (3.3V + 10%)
V IN(MAX CONTINUOUS) = 1.575V (1.5V + 5%)
Reducing Power Dissipation
In some applications it may be necessary to reduce
the power dissipation in the LT3085 package without
sacri?cing output current capability. Two techniques are
available. The ?rst technique, illustrated in Figure 8, em-
ploys a resistor in series with the regulator’s input. The
voltage drop across R S decreases the LT3085’s IN-to-OUT
differential voltage and correspondingly decreases the
LT3085’s power dissipation.
V IN
I CONTROL = OUT =
V OUT = 0.9V, I OUT = 0.5A, T A = 50°C
Power dissipation under these conditions is equal to:
P DRIVE = (V CONTROL – V OUT )(I CONTROL )
I 0.5A
= 8.3mA
60 60
C1
V CONTROL
LT3085
+
IN
OUT
R S
V IN
V OUT
P DRIVE = (3.630V – 0.9V)(8.3mA) = 23mW
P OUTPUT = (V IN – V OUT )(I OUT )
SET
R SET
C2
3085 F08
P OUTPUT = (1.575V – 0.9V)(0.5A) = 337mW
Total Power Dissipation = 360mW
Junction Temperature will be equal to:
T J = T A + P TOTAL ? θ JA (approximated using tables)
T J = 50°C + 360mW ? 73°C/W = 76°C
Figure 8. Reducing Power Dissipation Using a Series Resistor
As an example, assume: V IN = V CONTROL = 5V, V OUT = 3.3V
and I OUT(MAX) = 0.5A. Use the formulas from the Calculating
Junction Temperature section previously discussed.
In this case, the junction temperature is below the maximum
rating, ensuring reliable operation.
3085fb
16
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