- 您现在的位置：买卖IC网 > PDF目录17080 > MIC94095YC6 TR (Micrel Inc)IC LOAD SW HGH SIDE 1.2A SC70-6 PDF资料下载
参数资料
| 型号： | MIC94095YC6 TR |
| 厂商： | Micrel Inc |
| 文件页数： | 13/16页 |
| 文件大小： | 0K |
| 描述： | IC LOAD SW HGH SIDE 1.2A SC70-6 |
| 标准包装： | 1 |
| 类型： | 高端开关 |
| 输出数： | 1 |
| Rds（开）： | 225 毫欧 |
| 内部开关： | 是 |
| 电流限制： | 1.2A |
| 输入电压： | 1.7 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 6-TSSOP，SC-88，SOT-363 |
| 供应商设备封装： | SC-70-6 |
| 包装： | 标准包装 |
| 产品目录页面： | 1085 (CN2011-ZH PDF) |
| 其它名称： | 576-3494-6 |
Micrel, Inc.
Application Information
Power Dissipation Considerations
As with all power switches, the ultimate current rating of
the switch is limited by the thermal properties of the
package and the PCB it is mounted on. There is a
simple, ohms law type relationship between thermal
resistance, power dissipation and temperature which are
analogous to an electrical circuit:
MIC94090/1/2/3/4/5
A switch is intended to drive a 500mA load and is placed
on a printed circuit board which has a ground plane area
of at least 25mm square. The Voltage source is a Li-ion
battery with a lower operating threshold of 3V and the
ambient temperature of the assembly can be up to 50 o C.
Summary of variables:
I SW = 0.5A
VIN = 3V to 4.2V
Tamb = 50 o C
R θ JC = 60 o C/W from Datasheet (P. 3)
R θ CA = 53 o C/W Read from Graph in Fig. 3
Figure 1. Electrical Circuit
From this simple circuit we can calculate Vx if we know
Isource, Vz and the resistor values, Rxy and Ryz using
the equation:
Vx = Isource ? ( Rxy + Ryz ) + Vz
Thermal circuits can be considered using these same
rules and can be drawn similarly replacing current
sources with Power dissipation (in Watts), Resistance
with Thermal Resistance (in o C/W) and Voltage sources
with temperature (in o C).
Figure 3. Excerpt from the LDO Book (1)
P DISS = I SW2 x R SWmax
The worst case switch resistance (R SWmax ) at the lowest
VIN of 3V is not available in the datasheet, so the next
Figure 2. Thermal Equivalent Circuit
Now replacing the variables in the equation for Vx, we
can find the junction temperature (Tj) from power
dissipation, ambient temperature and the known thermal
resistance of the PCB (R θ CA ) and the package (R θ JA ).
T J = P DISS ? ( R θ JC + R θ CA ) + T AMB (1)
It is this equation that is used to determine the graphs on
page 7. P DISS is calculated as (I SWITCH2 x R SWmax ). R θ JC is
lower value of VIN is used.
R SWmax @ 2.5v = 315m Ω
If this were a figure for worst case R SWmax for 25 o C, an
additional consideration is to allow for the maximum
junction temperature of 125 o C, the actual worst case
resistance in this case will be 30% higher (See R DS(on)
variance vs. temperature graph).
R SWmax @ 2.5v (@ 125’C) = 315 x 1.3 = 410m Ω
found in the operating ratings section of the datasheet
and R θ CA (the PCB thermal resistance) values for
various PCB copper areas can be taken from ‘Designing
with Low Dropout Voltage Regulators’ (1) available from
the Micrel website (LDO Application Hints).
Example:
March 2009
13
Therefore junction temperature (T J ):
T J = 0.5 2 x 0.41 x (60+53) + 50
T J = 62 o C
This is well below the maximum 125 o C.
from (Eqn. 1)
M9999-033109-A
相关PDF资料 |
PDF描述 |
|---|---|
| V48C2E50BF3 | CONVERTER MOD DC/DC 2V 50W |
| HCC10DRXH | CONN EDGECARD 20POS DIP .100 SLD |
| MIC94093YC6 TR | IC LOAD SW HGH SIDE 1.2A SC70-6 |
| AP2182AMPG-13 | IC PWR SW USB 2CH 1.5A 8-MSOP |
| SC52-4R7 | INDUCTOR SMD 4.7UH 1.66A 7.96MHZ |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC94095YMT | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:High Side Load Switches for Consumer Applications |
| MIC94095YMT TR | 功能描述:电源开关 IC - USB High Side Load Switch 1.2A, 130m? RoHS:否 制造商:Micrel 电源电压-最小:2.7 V 电源电压-最大:5.5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-8 封装:Tube |
| MIC94095YMT-TR | 功能描述:IC LOAD SW HGH SIDE 1.2A 4-TMLF 制造商:microchip technology 系列:- 包装:剪切带（CT） 零件状态:停产 开关类型:通用 输出数:1 比率 - 输入:输出:1:1 输出配置:高端 输出类型:P 通道 接口:开/关 电压 - 负载:1.7 V ~ 5.5 V 电压 - 电源（Vcc/Vdd）:不需要 电流 - 输出（最大值）:1.2A 导通电阻（典型值）:130 毫欧 输入类型:非反相 特性:负载释放，压摆率受控型 故障保护:- 工作温度:-40°C ~ 125°C （TJ） 封装/外壳:4-UDFN 裸露焊盘，4-TMLF? 供应商器件封装:4-TMLF?（1.2x1.2） 标准包装:1 |
| MIC9409X | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:High Side Load Switches for Consumer Applications |
| MIC94161YCS TR | 制造商:Micrel Inc 功能描述: |
发布紧急采购，3分钟左右您将得到回复。