参数资料
| 型号： | LT3083IFE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 16/28页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO ADJ 3A 16-TSSOP |
| 标准包装： | 2,500 |
| 稳压器拓扑结构： | 正，可调式 |
| 输出电压： | 可调至 23V |
| 输入电压： | 1.2 V ~ 23 V |
| 电压 - 压降（标准）： | 1.25V @ 3A |
| 稳压器数量： | 1 |
| 电流 - 输出： | 3A |
| 电流 - 限制（最小）： | 3A |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 供应商设备封装： | 16-TSSOP-EP |
| 包装： | 带卷 (TR) |
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LT3083
APPLICATIONS INFORMATION
I CONTROL =
I OUT 3A
P TOTAL = ( ) ? ?
? + ( ) ? 2A
? 2A ?
? 60 ?
R S =
= 0.6 ?
P TOTAL = ( ) ? ?
? 2A ?
? 60 ?
Thepowerinthedrivecircuitequals:
P DRIVE = (V CONTROL – V OUT )(I CONTROL )
where I CONTROL is equal to I OUT /60. I CONTROL is a function
of output current. A curve of I CONTROL vs I OUT can be found
in the Typical Performance Characteristics curves.
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%)
V OUT = 0.9V, I OUT = 3A, T A = 50°C
Power dissipation under these conditions is equal to:
P DRIVE = (V CONTROL – V OUT )(I CONTROL )
= = 50mA
60 60
P DRIVE = (3.630V – 0.9V)(50mA) = 137mW
P OUTPUT = (V IN – V OUT )(I OUT )
As an example, assume: V IN = V CONTROL = 5V, V OUT = 3.3V
and I OUT(MAX) = 2A. Use the formulas from the Calculating
Junction Temperature section previously discussed.
Without series resistor R S , power dissipation in the LT3083
equals:
5V ? 3.3V 5V ? 3.3V
= 3.46W
If the voltage differential (V DIFF ) across the NPN pass
transistor is chosen as 0.5V, then RS equals:
5V ? 3.3V ? 0.5V
2A
Power dissipation in the LT3083 now equals:
5V ? 3.3V ? + 0.5V ? 2A = 1.06W
The LT3083’s power dissipation is now only 30% compared
to no series resistor. R S dissipates 2.4W of power. Choose
appropriate wattage resistors or use multiple resistors in
parallel to handle and dissipate the power properly.
P OUTPUT = (1.575V – 0.9V)(3A) = 2.03W
Total Power Dissipation = 2.16W
Junction Temperature will be equal to:
C1
V CONTROL
LT3083
IN
R S
V IN
V IN ′
T J = T A + P TOTAL ? θ JA (using tables)
T J = 50°C + 2.16W ? 16°C/W = 84.6°C
In this case, the junction temperature is below the maxi-
mum rating, ensuring reliable operation.
+
–
SET
R SET
3083 F07
OUT
C2
V OUT
Reducing Power Dissipation
In some applications it may be necessary to reduce the
power dissipation in the LT3083 package without sacrific-
ing output current capability. Two techniques are available.
The first technique, illustrated in Figure 7, employs a
resistor in series with the regulator’s input. The voltage
drop across RS decreases the LT3083’s input-to-output
differential voltage and correspondingly decreases the
LT3083’s power dissipation.
Figure 7. Reducing Power Dissipation Using a Series Resistor
3083fa
16
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3083IQ | 制造商:LINER 制造商全称:Linear Technology 功能描述:Adjustable 3A Single Resistor Low Dropout Regulator |
| LT3083IQ#PBF | 功能描述:IC REG LDO ADJ 3A 5-DDPAK RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:3,000 系列:- 稳压器拓扑结构:正，固定式 输出电压:2.5V 输入电压:2.5 V ~ 5.5 V 电压 - 压降（标准）:- 稳压器数量:1 电流 - 输出:300mA（最小值） 电流 - 限制（最小）:360mA 工作温度:-40°C ~ 85°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:带卷 (TR) |
| LT3083IQ#TRPBF | 功能描述:IC REG LDO ADJ 3A 5-DDPAK RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:3,000 系列:- 稳压器拓扑结构:正，固定式 输出电压:2.5V 输入电压:2.5 V ~ 5.5 V 电压 - 压降（标准）:- 稳压器数量:1 电流 - 输出:300mA（最小值） 电流 - 限制（最小）:360mA 工作温度:-40°C ~ 85°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:带卷 (TR) |
| LT3083IT | 制造商:LINER 制造商全称:Linear Technology 功能描述:Adjustable 3A Single Resistor Low Dropout Regulator |
| LT3083IT#PBF | 功能描述:IC REG LDO ADJ 3A TO-220-5 RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:3,000 系列:- 稳压器拓扑结构:正，固定式 输出电压:2.5V 输入电压:2.5 V ~ 5.5 V 电压 - 压降（标准）:- 稳压器数量:1 电流 - 输出:300mA（最小值） 电流 - 限制（最小）:360mA 工作温度:-40°C ~ 85°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:带卷 (TR) |
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