参数资料
| 型号： | LT3011EDD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 12/16页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO ADJ 50MA 10-DFN |
| 产品培训模块： | LT3011 - 50mA, 3V to 80V Low Dropout Micropower Linear Regulator with PWRGD 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： | 1.24 V ~ 60 V |
| 输入电压： | 2.8 V ~ 80 V |
| 电压 - 压降（标准）： | 0.3V @ 50mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 50mA |
| 电流 - 限制（最小）： | 60mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-WFDFN 裸露焊盘 |
| 供应商设备封装： | 10-DFN（3x3） |
| 包装： | 带卷 (TR) |
LT3011
APPLICATIONS INFORMATION
Calculating Junction Temperature
Example 1: Given an output voltage of 5V, an input volt-
age range of 24V to 30V, an output current range of 0mA
to 50mA, 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) = 50mA
V IN(MAX) = 30V
I GND at (I OUT = 50mA, V IN = 30V) = 1mA
So:
P = 50mA ? (30V – 5V) + (1mA ? 30V) = 1.28W
The thermal resistance will be in the range of 52°C/W to
64°C/W depending on the copper area. So, the junction
temperature rise above ambient will be approximately
equal to:
1.28W ? 58°C/W = 74°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 + 74°C = 124°C
Example 2: Given an output voltage of 5V, an input voltage
of 48V that rises to 72V for 5ms (max) out of every 100ms,
and a 5mA load that steps to 50mA for 50ms out of every
250ms, what is the junction temperature rise above ambi-
ent? Using a 500ms period (well under the time-constant
of the board), power dissipation is as follow:
P1 (48V IN , 5mA load) = 5mA ? (48V – 5V)
+ (200μA ? 48V) = 0.23W
P2 (48V IN , 50mA load) = 50mA ? (48V – 5V)
+ (1mA ? 48V) = 2.20W
P3 (72V IN , 5mA load) = 5mA (72V – 5V)
+ (200μA ? 72V) = 0.35W
P1 (72V IN , 50mA load) = 50mA (72V – 5V)
+ (1mA ? 72V) = 3.42W
Operation at the different power levels is as follows:
76% operation at P1, 19% for P2, 4% for P3,
and 1% for P4.
P EFF = 76%(0.23W) + 19%(2.20W) + 4%(0.35W)
+ 1%(3.42W) = 0.64W
With a thermal resistance in the range of 52°C/W to 64°C/W,
this translates to a junction temperature rise above ambi-
ent of 33°C to 41°C.
High Temperature Operation
Care must be taken when designing LT3011 applications to
operate at high ambient temperatures. The LT3011 works
at elevated temperatures but erratic operation can occur
due to unforeseen variations in external components. Some
tantalum capacitors are available for high temperature
operation, but ESR is often several ohms; capacitor ESR
above 3Ω is unsuitable for use with the LT3011. Ceramic
capacitor manufacturers (Murata, AVX, TDK and Vishay
Vitramon at this writing) now offer ceramic capacitors that
are rated to 150°C using an X8R dielectric. Device instability
will occur if the output capacitor value and ESR are outside
design limits at elevated temperature and operating DC
voltage bias (see information on capacitor characteristics
under Output Capacitance and Transient Response). Check
each passive component for absolute value and voltage
ratings over the operating temperature range.
Leakage in capacitors, or from solder ?ux left after insuf-
?cient board cleaning, adversely affects the low quies-
cent current operation. Consider junction temperature
increase due to power dissipation in both the junction
and nearby components to ensure maximum speci?ca-
tions are not violated for the LT3011E/LT3011H/LT3011I
or external components.
Protection Features
The LT3011 incorporates several protection features which
make it ideal for use in battery-powered circuits. In ad-
dition to the normal protection features associated with
monolithic regulators, such as current limiting and thermal
limiting, the device is protected against reverse-input
voltages, and reverse voltages from output-to-input.
3011f
12
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3011EMSE | 制造商:LINER 制造商全称:Linear Technology 功能描述:50mA, 3V to 80V Low Dropout Micropower Linear Regulator with PWRGD |
| LT3011EMSE#PBF | 功能描述:IC REG LDO ADJ 50MA 12-MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 产品培训模块:MIC5365/66 Ultra-small LDO Regulators 标准包装:1 系列:- 稳压器拓扑结构:正，固定式 输出电压:3V 输入电压:最高 5.5V 电压 - 压降（标准）:0.155V @ 150mA 稳压器数量:1 电流 - 输出:150mA 电流 - 限制（最小）:200mA 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:4-UDFN 裸露焊盘，4-TMLF? 供应商设备封装:4-TMLF?（1x1） 包装:Digi-Reel® 其它名称:576-3192-6 |
| LT3011EMSE#TRPBF | 功能描述:IC REG LDO ADJ 50MA 12-MSOP RoHS:是 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 |
| LT3011EMSEPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:50mA, 3V to 80V Low Dropout Micropower Linear Regulator with PWRGD |
| LT3011EMSETR | 制造商:LINER 制造商全称:Linear Technology 功能描述:50mA, 3V to 80V Low Dropout Micropower Linear Regulator with PWRGD |
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