参数资料
| 型号： | LT1086CT-2.85 |
| 厂商： | Linear Technology |
| 文件页数： | 10/16页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 2.85V 1.5A TO220-3 |
| 标准包装： | 50 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 2.85V |
| 输入电压： | 最高 18V |
| 电压 - 压降（标准）： | 1.3V @ 1.5A |
| 稳压器数量： | 1 |
| 电流 - 输出： | 1.5A |
| 电流 - 限制（最小）： | 1.5A |
| 工作温度： | 0°C ~ 150°C |
| 安装类型： | 通孔 |
| 封装/外壳： | TO-220-3 |
| 供应商设备封装： | TO-220-3 |
| 包装： | 管件 |
LT1086 Series
APPLICATIO N S I N FOR M ATIO N
( )
Load Regulation
Because the LT1086 is a 3-terminal device, it is not
possible to provide true remote load sensing. Load regu-
lation will be limited by the resistance of the wire connect-
ing the regulator to the load. The data sheet specification
for load regulation is measured at the bottom of the
package. Negative side sensing is a true Kelvin connec-
tion, with the bottom of the output divider returned to the
negative side of the load. Although it may not be immedi-
ately obvious, best load regulation is obtained when the
top of the resistor divider R1 is connected directly to the
case not to the load, as illustrated in Figure 2. If R1 were
connected to the load, the effective resistance between the
regulator and the load would be:
R P R2 + R 1 , R P = Parasitic Line Resistance
R1
R P
PARASITIC
Thermal Considerations
The LT1086 series of regulators have internal power and
thermal limiting circuitry designed to protect the device
under overload conditions. For continuous normal load
conditions however, maximum junction temperature rat-
ings must not be exceeded. It is important to give careful
consideration to all sources of thermal resistance from
junction to ambient. This includes junction-to-case, case-
to-heat sink interface and heat sink resistance itself. New
thermal resistance specifications have been developed to
more accurately reflect device temperature and ensure
safe operating temperatures. The data section for these
new regulators provides a separate thermal resistance and
maximum junction temperature for both the Control Sec-
tion and the Power Transistor. Previous regulators, with a
single junction-to-case thermal resistance specification,
used an average of the two values provided here and
therefore could allow excessive junction temperatures
under certain conditions of ambient temperature and heat
sink resistance. To avoid this possibility, calculations
V IN
IN
LT1086
OUT
LINE RESISTANCE
should be made for both sections to ensure that both
ADJ
thermal limits are met.
*CONNECT R1 TO CASE
CONNECT R2 TO LOAD
R1*
R2*
1086 ? F02
R L
For example, using a LT1086CK (TO-3, Commercial) and
assuming:
V IN (max continuous) = 9V, V OUT = 5V, I OUT = 1A,
T A = 75 ° C, θ HEAT SINK = 3 ° C/W,
θ CASE-TO-HEAT SINK = 0.2 ° C/ W for T package with
Figure 2. Connections for Best Load Regulation
Connected as shown, R P is not multiplied by the divider
ratio. R P is about 0.004 ? per foot using 16-gauge wire.
This translates to 4mV/ft at 1A load current, so it is
important to keep the positive lead between regulator and
load as short as possible and use large wire or PC board
traces.
Note that the resistance of the package leads for the H
package ≈ 0.06 ? /inch. While it is usually not possible to
connect the load directly to the package, it is possible to
connect larger wire or PC traces close to the case to avoid
voltage drops that will degrade load regulation.
For fixed voltage devices the top of R1 is internally Kelvin
connected and the ground pin can be used for negative
side sensing.
10
thermal compound.
Power dissipation under these conditions is equal to:
P D = (V IN – V OUT )(I OUT ) = 4W
Junction temperature will be equal to:
T J = T A + P D ( θ HEAT SINK + θ CASE-TO-HEAT SINK + θ JC )
For the Control Section:
T J = 75 ° C + 4W(3 ° C/W + 0.2 ° C/ W + 1.5 ° C/ W) = 94.6 ° C
95 ° C < 125 ° C = T JMAX (Control Section
Commercial Range)
For the Power Transistor:
T J = 75 ° C + 4W(3 ° C/ W + 0.2 ° C/ W + 4 ° C/ W) = 103.8 ° C
103.8 ° C < 150 ° C = T JMAX (Power Transistor
Commercial Range)
sn1086 1086ffs
相关PDF资料 |
PDF描述 |
|---|---|
| LT3050IDDB-5#TRPBF | IC REG LDO 5V .1A 12-DFN |
| LT3050IDDB-5#TRMPBF | IC REG LDO 5V .1A 12-DFN |
| EGM40DTMS-S189 | CONN EDGECARD 80POS R/A .156 SLD |
| EMM24DREF | CONN EDGECARD 48POS .156 EYELET |
| GMM43DRSI | CONN EDGECARD 86POS DIP .156 SLD |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1086CT-3.3 | 功能描述:IC REG LDO 3.3V 1.5A TO220-3 RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 产品培训模块:More Information on LDOs 标准包装:50 系列:- 稳压器拓扑结构:正，固定式 输出电压:3.3V 输入电压:最高 15V 电压 - 压降（标准）:1.1V @ 800mA 稳压器数量:1 电流 - 输出:800mA 电流 - 限制（最小）:800mA 工作温度:0°C ~ 125°C 安装类型:表面贴装 封装/外壳:TO-263-4，D²Pak（3 引线+接片），TO-263AA 供应商设备封装:D2PAK-3 包装:管件 |
| LT1086CT-3.3#PBF | 功能描述:IC REG LDO 3.3V 1.5A TO220-3 RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:1 系列:- 稳压器拓扑结构:正，固定式 输出电压:8V 输入电压:10.5 V ~ 23 V 电压 - 压降（标准）:1.7V @ 40mA 稳压器数量:1 电流 - 输出:100mA（最小值） 电流 - 限制（最小）:- 工作温度:0°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:剪切带 (CT) 产品目录页面:1075 (CN2011-ZH PDF) 其它名称:296-24390-1 |
| LT1086CT-3.3#PBF | 制造商:Linear Technology 功能描述:IC, LDO VOLT REG, 3.3V, 1.5A, TO-220 |
| LT1086CT-3.6 | 功能描述:IC REG LDO 3.6V 1.5A TO220-3 RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 产品培训模块:More Information on LDOs 标准包装:50 系列:- 稳压器拓扑结构:正，固定式 输出电压:3.3V 输入电压:最高 15V 电压 - 压降（标准）:1.1V @ 800mA 稳压器数量:1 电流 - 输出:800mA 电流 - 限制（最小）:800mA 工作温度:0°C ~ 125°C 安装类型:表面贴装 封装/外壳:TO-263-4，D²Pak（3 引线+接片），TO-263AA 供应商设备封装:D2PAK-3 包装:管件 |
| LT1086CT-3.6#PBF | 制造商:Linear Technology 功能描述:LDO Regulator Pos 3.6V 1.5A 3-Pin(3+Tab) TO-220 |
发布紧急采购，3分钟左右您将得到回复。