参数资料
| 型号： | MIC5355-SCYMME |
| 厂商： | Micrel Inc |
| 文件页数： | 9/18页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 3.3V/1V .5A 8MSOP |
| 标准包装： | 100 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 3.3V，1V |
| 输入电压： | 2.5 V ~ 5.5 V |
| 电压 - 压降（标准）： | 0.35V @ 500mA |
| 稳压器数量： | 2 |
| 电流 - 输出： | 500mA |
| 电流 - 限制（最小）： | 525mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽）裸露焊盘 |
| 供应商设备封装： | 8-MSOP-EP |
| 包装： | 管件 |
| 其它名称： | 576-3881-5 MIC5355-3.3/1.0YMME |
Micrel, Inc.
Application Information
MIC5355/6 is a dual 500mA LDO. The MIC5356
includes an auto-discharge circuit for each LDO output
that is activated when the output is disabled. The
MIC5355/6 regulator is fully protected from damage due
to fault conditions through linear current limiting and
thermal shutdown.
Input Capacitor
The MIC5355/6 is a high-performance, high-bandwidth
device. A 2.2μF input capacitor from the input pin to
ground is required to provide stability. Low-ESR ceramic
capacitors provide optimal performance in small board
area. Additional high-frequency capacitors, such as
small valued NPO dielectric type capacitors, help filter
out high-frequency noise and are good practice in any
RF based circuit. X5R or X7R dielectrics are
recommended for the input capacitor. Y5V dielectrics
lose most of their capacitance over temperature and are
therefore not recommended.
Output Capacitor
The MIC5355/6 requires an output capacitor of 2.2μF or
greater to maintain stability. The design is optimized for
use with low-ESR ceramic chip capacitors. High-ESR
capacitors may cause high-frequency oscillation. The
output capacitor can be increased, but performance has
been optimized for a 2.2μF ceramic output capacitor and
does not improve significantly with larger capacitance.
X7R and X5R dielectric ceramic capacitors are
recommended because of their temperature
performance. X7R capacitors change capacitance by
15% over their operating temperature range and are the
most stable type of ceramic capacitors. Z5U and Y5V
dielectric capacitors change value by as much as 50%
and 60% respectively over their operating temperature
ranges. To use a ceramic chip capacitor with Y5V
dielectric the value must be much higher than an X7R
ceramic capacitor to ensure the same minimum
capacitance over the equivalent operating temperature
range.
MIC5355/6
Enable/Shutdown
The MIC5355/6 comes with two active high enable pins
that allow each regulator to be disabled independently.
Forcing the enable pin low disables the regulator and
places it into an off mode current state drawing virtually
zero current. When disabled, the MIC5356 switches an
internal 30 ? load on the regulator output to discharge
the external capacitor.
Forcing the enable pin high enables the output voltage.
The active high enable pin uses CMOS technology and
cannot be left floating. A floating enable pin may cause
an indeterminate state on the output.
Thermal Considerations
The MIC5355/6 is designed to provide two 500mA
continuous current outputs in a small package.
Maximum operating temperature can be calculated
based on the output currents and the voltage drop
across the part. For example, if the input voltage is 3.0V,
V OUT1 = 2.5V, V OUT2 = 1.8V and each with an output
current = 500mA. The actual power dissipation of the
regulator circuit can be determined using the equation:
P D = (V IN ? V OUT1 ) I OUT ? (V IN ? V OUT2 ) I OUT2 ? V IN I GND
Because this is CMOS device and the ground current is
typically <100μA over the load range, the power
dissipation contributed by the ground current is <1%
which can be ignored for this calculation:
P D = (3.0V – 2.5V) × 500mA + (3.0V – 1.8V) × 500mA
P D = 0.85W
To determine the maximum ambient operating
temperature of the package, use the junction to ambient
thermal resistance of the device and the following basic
equation:
P D(MAX) ? ? ?
?
?
No Load Stability
Unlike many other voltage regulators, the MIC5355/6 will
? T J(MAX) ? T A
? θ JA
?
?
remain stable and in regulation with no load.
T J(MAX) = 125°C
θ JA = 64.4°C/W
March 2012
9
M9999-031512-A
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC5355-SCYMME TR | 功能描述:低压差稳压器 - LDO Dual 500mA Cap Low Dropout, Micropower Linear Regulator RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MIC5355-SGYMME | 功能描述:低压差稳压器 - LDO Dual 500mA Cap Low Dropout, Micropower Linear Regulator RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MIC5355-SGYMME TR | 功能描述:低压差稳压器 - LDO Dual 500mA Cap Low Dropout, Micropower Linear Regulator RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MIC5356-G4YMME | 功能描述:低压差稳压器 - LDO Dual 500mA Cap Low Dropout, Micropower Linear Regulator w/ Active Pull-Down RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MIC5356-G4YMME TR | 功能描述:低压差稳压器 - LDO Dual 500mA Cap Low Dropout, Micropower Linear Regulator w/ Active Pull-Down RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
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