参数资料
| 型号： | MIC5321-MFYML TR |
| 厂商： | Micrel Inc |
| 文件页数： | 9/12页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 2.8V/1.5V .15A 6-MLF |
| 标准包装： | 1 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 2.8V，1.5V |
| 输入电压： | 2.3 V ~ 5.5 V |
| 电压 - 压降（标准）： | 0.035V @ 150mA |
| 稳压器数量： | 2 |
| 电流 - 输出： | 150mA |
| 电流 - 限制（最小）： | 300mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 6-WFDFN 裸露焊盘，6-TMLF? |
| 供应商设备封装： | 6-MLF?（1.6x1.6） |
| 包装： | 标准包装 |
| 其它名称： | 576-1570-6 |
?
Micrel, Inc.
Applications Information
Enable/Shutdown
The MIC5321 comes with a single active-high enable
pin that allows both regulators to be disabled
simultaneously. Forcing the enable pin low disables
the regulator 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 MIC5321 is a high-performance, high bandwidth
device. Therefore, it requires a well-bypassed input
supply for optimal performance. A 1μF 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 MIC5321 requires an output capacitor of 1μF 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 1μF ceramic
output capacitor and does not improve significantly
with larger capacitance.
X7R/X5R dielectric-type ceramic capacitors are
recommended because of their temperature perform-
ance. 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
MIC5321
PSRR. Turn-on time increases slightly with respect to
bypass capacitance. A unique, quick-start circuit
allows the MIC5321 to drive a large capacitor on the
bypass pin without significantly slowing turn-on time.
Refer to the Typical Characteristics section for
performance with different bypass capacitors.
No-Load Stability
Unlike many other voltage regulators, the MIC5321
will remain stable and in regulation with no load. This
is especially important in CMOS RAM keep-alive
applications.
Thermal Considerations
The MIC5321 is designed to provide 150mA of
continuous current for both outputs in a very small
package. 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 3.3V, the output voltage is 2.8V for V OUT1 ,
2.5V for V OUT2 and the output current = 150mA. 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 <150μA over the load range, the power
dissipation contributed by the ground current is < 1%
and can be ignored for this calculation.
P D = (3.3V – 2.8V) × 150mA + (3.3V -1.5) × 150mA
P D = 0.345W
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:
? T J(MAX) - T A
P D(MAX) =
JA
T J(max) = 125°C, the maximum junction temperature of
the die θ JA thermal resistance = 100°C/W.
The table below shows junction-to-ambient thermal
resistance for the MIC5321 in the Thin MLF ? package.
minimum capacitance over the equivalent operating
temperature range.
Package
θ JA Recommended
Minimum Footprint
θ JC
Bypass Capacitor
A capacitor can be placed from the noise bypass pin
6-Pin 1.6x1.6 Thin MLF
?
100°C/W
2°C/W
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
Thermal Resistance
May 2008
9
M9999-051508-E
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC5321-MFYMT TR | 功能描述:低压差稳压器 - LDO Dual 150mA LDO Thin MLF Enable and Bypass (Lead Free) 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 |
| MIC5321-MGYD6 TR | 功能描述:低压差稳压器 - LDO Dual 150mA LDO Thin Sot Enable and Bypass (Lead Free) 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 |
| MIC5321-MGYML TR | 功能描述:低压差稳压器 - LDO Dual 150mA LDO 1.6*1.6 MLF Enable and Bypass (Lead Free) 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 |
| MIC5321-MGYMT | 制造商:Rochester Electronics LLC 功能描述: 制造商:RF Micro Devices Inc 功能描述: |
| MIC5321-MGYMT TR | 功能描述:低压差稳压器 - LDO Dual 150mA LDO Thin MLF Enable and Bypass (Lead Free) 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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