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Micrel, Inc.
Application Information
The MIC94300 utilizes Ripple Blocker ? technology to
integrate a load switch with a high-performance active
filter. The MIC94300 includes a low-voltage logic enable
pin, and is fully protected from damage due to fault
conditions, offering linear current limiting and thermal
shutdown.
Input Capacitor
The MIC94300 is a high-performance, high-bandwidth
device. An input capacitor of 470nF 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 Capacitor
The MIC94300 requires an output capacitor of 0.47μF or
greater to maintain stability. For optimal ripple rejection
performance a 1μF capacitor is recommended. 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 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
MIC94300
Enable/Shutdown
The MIC94300 comes with an active-high enable pin
that allows the Ripple Blocker ? to be disabled. Forcing
the enable pin low disables the MIC94300 and sends it
into a “zero” off mode current state. In this state, current
consumed by the MIC94300 goes nearly to zero. Forcing
the enable pin high enables the output voltage. The
active-high enable pin uses CMOS technology and the
enable pin cannot be left floating; a floating enable pin
may cause an indeterminate state on the output.
Thermal Considerations
The MIC94300 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 which is fixed at 170mV typical, 250mV worst case.
For example if the input voltage is 2.75V, the output
voltage is 2.5V, 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 <100μA over the load range, the power
dissipation contributed by the ground current is <1% and
can be ignored for this calculation:
P D = (2.75V ? 2.5V) × 200mA
P D = 0.05W
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) = ? ?
?
?
capacitance over the equivalent operating temperature
range.
No Load Stability
? T J(MAX) ? T A
? θ JA
?
?
The MIC94300 will remain stable with no load. This is
especially important in CMOS RAM keep-alive
applications.
T J(max) = 125°C, the maximum junction temperature of the
die, θ JA thermal resistance = 250°C/W for the YCS
package and 173°C/W for the YMT package.
February 2012
9
M9999-020312-A
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相关代理商/技术参数
MIC94300YCS TR
功能描述:电源开关 IC - 配电 200mA Ripple Blocker Voltage Follower in 0.88mm x 0.88mm Chip Scale Pkg
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
MIC94300YCSEV
制造商:Micrel Inc 功能描述:BOARD EVAL FOR MIC94300CS
MIC94300YCS-TR
功能描述:IC LOAD SWITCH 200MA 4WLCSP 制造商:microchip technology 系列:Ripple Blocker?? 包装:剪切带（CT） 零件状态:过期 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:N 通道 接口:开/关 电压 - 负载:1.8 V ~ 3.6 V 电压 - 电源（Vcc/Vdd）:不需要 电流 - 输出（最大值）:200mA 导通电阻（典型值）:- 输入类型:非反相 特性:- 故障保护:限流（固定），超温 工作温度:-40°C ~ 125°C （TJ） 封装/外壳:4-UFBGA，WLCSP 供应商器件封装:4-WLCSP（0.88x0.88） 标准包装:1
MIC94300YMT
制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:200mA Switch with Ripple Blockera?￠ Technology
MIC94300YMT EV
功能描述:电源管理IC开发工具 200mA Ripple Blocker Voltage Follower in 1.2mm x 1.6mm Thin MLF Pkg - Evaluation Board
RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V
MIC94300YMT T5
功能描述:电源开关 IC - 配电 200mA Ripple Blocker Voltage Follower in 1.2mm x 1.6mm Thin MLF Pkg
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
MIC94300YMT TR
功能描述:电源开关 IC - 配电 200mA Ripple Blocker Voltage Follower in 1.2mm x 1.6mm Thin MLF Pkg
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
MIC94300YMTEV
制造商:Micrel Inc 功能描述:Evaluation Board for MIC94300YMT 制造商:Micrel Inc 功能描述:BOARD EVAL FOR MIC94300MT