参数资料
| 型号： | MIC94310-SYMT T5 |
| 厂商： | Micrel Inc |
| 文件页数： | 9/14页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 3.3V .2A 4MLF |
| 标准包装： | 500 |
| 系列： | Ripple Blocker™ |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 3.3V |
| 输入电压： | 最高 3.6V |
| 电压 - 压降（标准）： | 0.04V @ 200mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 200mA |
| 电流 - 限制（最小）： | 250mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 4-UFDFN，4-TMLF? |
| 供应商设备封装： | 4-TMLF?（1.2x1.6） |
| 包装： | 带卷 (TR) |
? T J(max) ? T A ?
P D(MAX) = ? ?
?
Micrel, Inc.
Application Information
The MIC94310 is a very-high PSRR, fixed-output, 200mA
LDO utilizing Ripple Blocker? technology. The
MIC94310 is fully protected from damage due to fault
conditions, offering linear current limiting and thermal
shutdown.
Input Capacitor
The MIC94310 is a high-performance, high-bandwidth
device. An input capacitor of 0.47μF is required from the
input to ground to provide stability. Low-ESR ceramic
capacitors provide optimal performance at a minimum of
space. 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 Capacitance
In order to maintain stability, the MIC94310 requires an
output capacitor of 0.47μF or greater for the Thin DFN
and CSP packages and 10μF or greater for the SOT-23
package. For optimal ripple rejection performance a 1μF
capacitor is recommended for the CSP and Thin DFN
packages, while a 10μF capacitor is recommended for
the SOT-23 package. The design is optimized for use
with low-ESR ceramic chip capacitors. High-ESR
capacitors are not recommended because they may
cause high-frequency oscillation. The output capacitor
can be increased, but performance has been optimized
for a 1μF ceramic output capacitor and does not improve
significantly with larger capacitance.
X7R/X5R dielectric type ceramic capacitors are
recommended because of their temperature
performance. X7R type 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 their value by as much as
50% and 60%, respectively, over their operating
temperature ranges. To use a ceramic chip capacitor with
the 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.
No Load Stability
The MIC94310 will remain stable and in regulation with
no load. This is especially important in CMOS RAM keep-
alive applications.
MIC94310
Enable/Shutdown
Forcing the enable (EN) pin low disables the MIC94310
and sends it into a “zero” off mode current state. In this
state, current consumed by the MIC94310 goes nearly to
zero. Forcing EN high enables the output voltage. The
EN pin uses CMOS technology and cannot be left floating
as it could cause an indeterminate state on the output.
Thermal Considerations
The MIC94310 is designed to provide 200mA of
continuous current in a very-small package. Maximum
ambient operating temperature can be calculated based
on the output current and the voltage drop across the
part. For example if the input voltage is 2.5V, the output
voltage is 1.8V, and the output current = 200mA. The
actual power dissipation of the Ripple Blocker? can be
determined using the equation:
P D = (V IN – V OUT1 ) I OUT + V IN I GND
Because this device is CMOS and the ground current is
typically <170μA over the load range, the power
dissipation contributed by the ground current is <1% and
can be ignored for this calculation.
P D = (2.5V – 1.8V) × 200mA
P D = 0.14W
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:
?
? θ JA ?
T J(MAX) = 125oC, the maximum junction temperature of the
die, θ JA thermal resistance = 173°C/W for the Thin DFN
package.
Substituting P D for P D(MAX) and solving for the ambient
operating temperature will give the maximum operating
conditions for the regulator circuit.
For proper operation, the maximum power dissipation
must not be exceeded.
For example, when operating the MIC94310-GYMT at an
input voltage of 2.5V and 200mA load with a minimum
October 30, 2013
9
Revision 2.0
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC94310-SYMT-TR | 功能描述:Linear Voltage Regulator IC Positive Fixed 1 Output 3.3V 200mA 4-TDFN (1.2x1.6) 制造商:microchip technology 系列:Ripple Blocker?? 包装:剪切带（CT） 零件状态:有效 稳压器拓扑:正，固定式 电压 - 输出:3.3V 电流 - 输出:200mA 电压 - 跌落（典型值）:0.04V @ 200mA 稳压器数:1 电压 - 输入:最高 3.6V 电流 - 限制（最小值）:250mA 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:4-UFDFN 裸露焊盘 供应商器件封装:4-TDFN（1.2x1.6） 标准包装:1 |
| MIC94325 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:500mA LDO with Ripple Blocker??¤ Technology |
| MIC94325YMT T5 | 功能描述:电源开关 IC - 配电 500mA LDO with Ripple Blocker Technology in 1.6mm x 1.6mm Thin DFN 6-Pin Package RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5 |
| MIC94325YMT TR | 功能描述:电源开关 IC - 配电 500mA LDO with Ripple Blocker Technology in 1.6mm x 1.6mm Thin DFN 6-pin Package RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5 |
| MIC94325YMT-EV | 功能描述:MIC94325 Ripple Blocker? Series 1 - Single Channels per IC Positive Adjustable Linear Voltage Regulator Evaluation Board 制造商:microchip technology 系列:Ripple Blocker?? 零件状态:无货 每 IC 通道数:1 - 单 电压 - 输出:- 电流 - 输出:500mA 电压 - 输入:1.8 V ~ 3.6 V 稳压器类型:正，可调式 工作温度:-40°C ~ 125°C 板类型:完全填充 所含物品:板 使用的 IC/零件:MIC94325 标准包装:1 |
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