参数资料
| 型号： | MIC5335-PKYMT TR |
| 厂商： | Micrel Inc |
| 文件页数： | 8/10页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 3V/2.6V .3A 6-MLF |
| 标准包装： | 5,000 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 3V，2.6V |
| 输入电压： | 2.3 V ~ 5.5 V |
| 电压 - 压降（标准）： | 0.075V @ 300mA |
| 稳压器数量： | 2 |
| 电流 - 输出： | 300mA |
| 电流 - 限制（最小）： | 340mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 6-UFDFN 裸露焊盘，6-TMLF? |
| 供应商设备封装： | 6-TMLF?（1.6x1.6） |
| 包装： | 带卷 (TR) |
| 其它名称： | MIC5335-PKYMTTR MIC5335-PKYMTTR-ND |
Micrel, Inc.
Applications Information
Enable/Shutdown
The MIC5335 comes with dual active-high enable pins
that allow each regulator to be enabled independently.
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 MIC5335 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-
MIC5335
Thermal Considerations
The MIC5335 is designed to provide 300mA of
continuous current for both outputs in a very small
package. Maximum ambient operating temperature
can be calculated based upon 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 = 300mA. 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 = (3.3V – 2.8V) × 300mA + (3.3V – 2.5V) × 300mA
P D = 0.39W
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) = ?
θ JA
?
?
?
frequency noise and are good practice in any RF-
based circuit.
? T J(max) ? T A
?
?
?
Output Capacitor
The MIC5335 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
T J(max) = 125°C, the maximum junction temperature of
the die θ JA thermal resistance = 100°C/W.
The table that follows shows junction-to-ambient
thermal resistance for the MIC5335 in the Thin MLF ?
package.
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
Package
6-Pin 1.6 X1.6
Thin MLF?
θ JA
Recommended
Minimum
Footprint
100°C/W
θ JC
2°C/W
range and are the most stable type of ceramic
capacitors on the market. 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.
No-Load Stability
Unlike many other voltage regulators, the MIC5335
will remain stable and in regulation with no load. This
is especially important in CMOS RAM keep-alive
applications.
Thermal Resistance
Substituting P D for P D(max) and solving for the ambient
operating temperature will give the maximum
operating conditions for the regulator circuit. The
junction-to-ambient thermal resistance for the
minimum footprint is 100°C/W.
The maximum power dissipation must not be
exceeded for proper operation.
For example, when operating the MIC5335-MFYML at
an input voltage of 3.3V and 300mA loads on each
output with a minimum footprint layout, the maximum
ambient operating temperature T A can be determined
as follows:
0.39W = (125°C – T A )/(100°C/W)
May 2008
8
M9999-051508
相关PDF资料 |
PDF描述 |
|---|---|
| MIC5335-OGYMT TR | IC REG LDO 2.9V/1.8V .3A 6-MLF |
| ABC22DRTN-S93 | CONN EDGECARD 44POS DIP .100 SLD |
| ABC22DRTH-S93 | CONN EDGECARD 44POS DIP .100 SLD |
| MIC5335-OFYMT TR | IC REG LDO 2.9V/1.5V .3A 6-MLF |
| MIC5335-NNYMT TR | IC REG LDO 2.85V .3A 6-MLF |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC5335-PMYMT | 制造商:Rochester Electronics LLC 功能描述: 制造商:RF Micro Devices Inc 功能描述: |
| MIC5335-PMYMT TR | 功能描述:低压差稳压器 - LDO Dual 300mA LDO in 1.6mm x 1.6mm Thin MLF Dual EN 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 |
| MIC5335-PMYMT-TR | 功能描述:Linear Voltage Regulator IC Positive Fixed 2 Output 3V, 2.8V 300mA 6-TMLF? (1.6x1.6) 制造商:microchip technology 系列:- 包装:剪切带（CT） 零件状态:停产 稳压器拓扑:正，固定式 电压 - 输出:3V，2.8V 电流 - 输出:300mA 电压 - 跌落（典型值）:0.075V @ 300mA 稳压器数:2 电压 - 输入:2.3 V ~ 5.5 V 电流 - 限制（最小值）:340mA 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:6-UFDFN 裸露焊盘，6-TMLF? 供应商器件封装:6-TMLF?（1.6x1.6） 标准包装:1 |
| MIC5335-PNYMT | 制造商:Rochester Electronics LLC 功能描述: 制造商:RF Micro Devices Inc 功能描述: |
| MIC5335-PNYMT TR | 功能描述:低压差稳压器 - LDO Dual 300mA LDO in 1.6mm x 1.6mm Thin MLF Dual EN 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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