参数资料
| 型号： | LT3028EDHC#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 13/16页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO ADJ .5A/.1A 16-DFN |
| 产品培训模块： | More Information on LDOs |
| 标准包装： | 73 |
| 稳压器拓扑结构： | 正，可调式 |
| 输出电压： | 1.22 V ~ 20 V |
| 输入电压： | 1.8 V ~ 20 V |
| 电压 - 压降（标准）： | 0.32V @ 500mA，0.3V @ 100mA |
| 稳压器数量： | 2 |
| 电流 - 输出： | 500mA，100mA |
| 电流 - 限制（最小）： | 520mA，110mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WFDFN 裸露焊盘 |
| 供应商设备封装： | 16-DFN（5x3） |
| 包装： | 管件 |
| 产品目录页面： | 1330 (CN2011-ZH PDF) |
LT3028
APPLICATIO S I FOR ATIO
Voltage and temperature coefficients are not the only
sources of problems. Some ceramic capacitors have a
piezoelectric response. A piezoelectric device generates
voltage across its terminals due to mechanical stress,
similar to the way a piezoelectric accelerometer or
microphone works. For a ceramic capacitor the stress
can be induced by vibrations in the system or thermal
transients. The resulting voltages produced can cause
appreciable amounts of noise, especially when a ceramic
capacitor is used for noise bypassing. A ceramic capaci-
tor produced Figure 6’s trace in response to light tapping
from a pencil. Similar vibration induced behavior can
masquerade as increased output voltage noise.
C OUT = 10 μ F
C BYP = 0.01 μ F
I LOAD = 100mA
For continuous normal conditions, the maximum junction
temperature rating of 125 ° C must not be exceeded. It is
important to give careful consideration to all sources of
thermal resistance from junction to ambient. Additional
heat sources mounted nearby must also be considered.
For surface mount devices, heat sinking is accomplished
by using the heat spreading capabilities of the PC board
and its copper traces. Copper board stiffeners and plated
through-holes can also be used to spread the heat gener-
ated by power devices.
The following tables list thermal resistance for several
different board sizes and copper areas. All measurements
were taken in still air on 3/32" FR-4 board with one ounce
copper.
Table 1. FE Package, 16-Lead TSSOP
COPPER AREA
THERMAL RESISTANCE
V OUT
TOPSIDE* BACKSIDE
BOARD AREA
(JUNCTION-TO-AMBIENT)
500 μ V/DIV
2500mm 2
2500mm 2
2500mm 2
38 ° C/W
1000mm
2500mm
2
2500mm
2
2
43 ° C/W
2500mm
225mm
2
2500mm
2
2
48 ° C/W
100mm 2
2500mm 2
2500mm 2
60 ° C/W
100ms/DIV
3028 F05
*Device is mounted on topside.
Figure 6. Noise Resulting from Tapping on a Ceramic Capacitor
Table 2. DHC Package, 16-Lead DFN
COPPER AREA
THERMAL RESISTANCE
TOPSIDE* BACKSIDE
BOARD AREA
(JUNCTION-TO-AMBIENT)
Thermal Considerations
2500mm 2
2500mm 2
2500mm 2
40 ° C/W
1000mm
The power handling capability of the device will be limited
2
2500mm
2
2500mm 2
45 ° C/W
2500mm
2500mm
by the maximum rated junction temperature (125 ° C). The
power dissipated by the device will be made up of two
225mm
100mm
2
2
2500mm
2500mm
2
2
2
2
50 ° C/W
62 ° C/W
components for each output:
1. Output current multiplied by the input/output voltage
differential: (I OUT )(V IN – V OUT ), and
2. GND pin current multiplied by the input voltage:
(I GND )(V IN ).
The ground pin current can be found by examining the
GND Pin Current curves in the Typical Performance Char-
acteristics section. Power dissipation will be equal to the
sum of the two components listed above.
The LT3028 regulator has internal thermal limiting de-
signed to protect the device during overload conditions.
*Device is mounted on topside.
The thermal resistance junction-to-case ( θ JC ), measured
at the Exposed Pad on the back of the die is 10 ° C/W for the
DFN package and 8 ° C/W for the TSSOP package.
Calculating Junction Temperature
Example: Given Output 1 set for an output voltage of 3.3V,
Output 2 set for an output voltage of 2.5V, an input voltage
range of 3.8V to 5V, an output current range of 0mA to
500mA for Output 1, an output current range of 0mA to
100mA for Output 2 and a maximum ambient temperature
of 50 ° C, what will the maximum junction temperature be?
3028f
13
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3028EFE | 制造商:Linear Technology 功能描述:LDO Regulator Pos 1.22V to 20V 0.1A/0.5A 16-Pin TSSOP EP |
| LT3028EFE#PBF | 功能描述:IC REG LDO ADJ .5A/.1A 16-TSSOP 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 |
| LT3028EFE#TRPBF | 功能描述:IC REG LDO ADJ .5A/.1A 16-TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:800 系列:- 稳压器拓扑结构:正，固定式 输出电压:2.5V 输入电压:最高 16V 电压 - 压降（标准）:0.7V @ 4A 稳压器数量:1 电流 - 输出:4A 电流 - 限制（最小）:4.2A 工作温度:0°C ~ 125°C 安装类型:表面贴装 封装/外壳:TO-263-6，D²Pak（5 引线+接片），TO-263BA 供应商设备封装:TO-263-5 包装:带卷 (TR) 其它名称:AP1184K525L-13AP1184K525LDITR |
| LT3028EFEPBF | 制造商:Linear Technology 功能描述:LT3028 dual adj 500/100mA LDO regulator |
| LT3028IDHC | 制造商:Linear Technology 功能描述:LDO Regulator Pos 1.22V to 20V1.22V to 20V 0.1A/0.5A 16-Pin DFN EP |
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