参数资料
| 型号： | MIC5357-SGYMME |
| 厂商： | Micrel Inc |
| 文件页数： | 7/11页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 3.3V/1.8V .5A 8MSOP |
| 标准包装： | 100 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 3.3V，1.8V |
| 输入电压： | 2.6 V ~ 5.5 V |
| 电压 - 压降（标准）： | 0.13V @ 500mA |
| 稳压器数量： | 2 |
| 电流 - 输出： | 500mA |
| 电流 - 限制（最小）： | 550mA |
| 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： | 576-3848 |
Micrel, Inc.
Applications Information
Enable/Shutdown
The MIC5357 is provided with dual active high enable
pins that allow each regulator to be enabled
independently. Forcing both enable pins low disables the
regulators and sends it into a “zero” off-mode-current
state. In this state, current consumed by the regulator
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.
Input Capacitor
The MIC5357 is a high performance, high bandwidth
device. Therefore, it requires a well bypassed input
supply for optimal performance. A 2.2μF capacitor 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.
Output Capacitor
The MIC5357 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/X5R dielectric type ceramic capacitors are
recommended because of their superior 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
MIC5357
A unique, quick start circuit allows the MIC5357 to drive
a large capacitor on the bypass pin without significantly
slowing the turn on time.
No-Load Stability
Unlike many other voltage regulators, the MIC5357 will
remain stable with no load. This is especially important
in CMOS RAM keep alive applications.
Thermal Considerations
The MIC5357 is designed to provide 500mA of
continuous current for V OUT1 and 500mA for V OUT2 in a
small package. The maximum ambient operating
temperature can be calculated based on the output
current and the voltage drop across the part. Given that
the input voltage is 3.6V, the output voltage is 3.3V for
V OUT1 , 2.8V for V OUT2 and the output current of 500mA
and 500mA respectively. The actual power dissipation of
the regulator circuit can be determined using the
equation:
P D = (V IN – V OUT1 ) I OUT1 + (V IN – V OUT2 ) I OUT2 + 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 = (3.6V – 3.3V) × 500mA + (3.6V -2.8) × 500mA
P D = 0.55W
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:
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
P D(MAX) =
?
?
T J(MAX) - T A
JA
an X7R ceramic capacitor to ensure the same minimum
capacitance over the equivalent operating temperature
range.
Bypass Capacitor
A capacitor can be placed from the noise bypass pin to
ground to reduce output voltage noise. The capacitor
bypasses the internal reference. A 0.1μF capacitor is
recommended for applications that require low noise
outputs. The bypass capacitor can be increased, further
reducing noise and improving PSRR. Turn on time
increases slightly with respect to bypass capacitance.
T J(max) = 125°C, the maximum junction temperature of
the die θ JA thermal resistance = 64.4°C/W.
January 2011
7
M9999-011311
相关PDF资料 |
PDF描述 |
|---|---|
| MIC5365-2.5YMT TR | IC REG LDO 2.5V .15A 4-TMLF |
| MIC5368-1.2YMT TR | IC REG LDO 1.2V .15A 6TMLF |
| MIC5371-PPYMT TR | IC REG LDO 3V .15A 6TMLF |
| MIC5374-SJG1YMT TR | IC REG LDO 3.3/2.5/1.8/1V 16MLF |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC5357-SGYMME TR | 功能描述:低压差稳压器 - LDO High Performance Dual 500mA ULDO in 8-ld MSOP ePAD 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 |
| MIC5357-SMYMME | 功能描述:低压差稳压器 - LDO High Performance Dual 500mA ULDO in 8-ld MSOP ePAD 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 |
| MIC5357-SMYMME TR | 功能描述:低压差稳压器 - LDO High Performance Dual 500mA ULDO in 8-ld MSOP ePAD 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 |
| MIC5363-1.2YMT T5 | 功能描述:低压差稳压器 - LDO Single 300mA Low Dropout LDO 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 |
| MIC5363-1.2YMT TR | 功能描述:低压差稳压器 - LDO Single 300mA Low Dropout LDO 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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