参数资料
| 型号： | MIC5301-2.9YD5 TR |
| 厂商： | Micrel Inc |
| 文件页数： | 8/11页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 2.9V .15A TSOT23-5 |
| 标准包装： | 3,000 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 2.9V |
| 输入电压： | 最高 5.5V |
| 电压 - 压降（标准）： | 0.04V @ 150mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 150mA |
| 电流 - 限制（最小）： | 275mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-5 细型，TSOT-23-5 |
| 供应商设备封装： | TSOT-23-5 |
| 包装： | 带卷 (TR) |
| 其它名称： | MIC5301-2.9YD5TR MIC5301-2.9YD5TR-ND |
Micrel, Inc.
Applications Information
Enable/Shutdown
The MIC5301 comes with an active-high enable pin
that allows the regulator to be disabled. 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 MIC5301 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
MIC5301
PSRR. Turn-on time increases slightly with respect to
bypass capacitance. A unique, quick-start circuit
allows the MIC5301 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 MIC5301
will remain stable and in regulation with no load. This
is especially important in CMOS RAM keep-alive
applications.
Adjustable Regulator Application
Adjustable regulators use the ratio of two resistors to
multiply the reference voltage to produce the desired
output voltage. The MIC5301 can be adjusted from
1.25V to 5.5V by using two external resistors (Figure
1). The resistors set the output voltage based on the
following equation:
V OUT = V REF ? 1 +
?
dielectric-type capacitors, help filter out high-
frequency noise and are good practice in any RF-
based circuit.
?
?
R1 ?
R2 ?
Output Capacitor
The MIC5301 requires an output capacitor of 1μF or
V REF = 1.25V
MIC5301YMT
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
V IN
1μF
VIN VOUT
EN ADJ
GND
R1
R2
V OUT
1μF
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 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 0.1 μ F
capacitor is recommended for applications that require
low-noise outputs. The bypass capacitor can be
increased, further reducing noise and improving
Figure 1. Adjustable Voltage Output
Thermal Considerations
The MIC5301 is designed to provide 150mA of
continuous current. 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 5.0V, the output voltage is
2.8V and the output current = 150mA.
The actual power dissipation of the regulator circuit
can be determined using the equation:
P D = (V IN – V OUT ) 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 = (5V – 2.8V) × 150mA
P D = 0.33W
April 2008
8
M9999-042108
相关PDF资料 |
PDF描述 |
|---|---|
| MIC5301-2.8YD5 TR | IC REG LDO 2.8V .15A TSOT23-5 |
| MIC5301-2.1YD5 TR | IC REG LDO 2.1V .15A TSOT23-5 |
| EGM40DTKN | CONN EDGECARD 80POS DIP .156 SLD |
| GMA36DTAH | CONN EDGECARD 72POS R/A .125 SLD |
| GSA36DTAD | CONN EDGECARD 72POS R/A .125 SLD |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC5301-3.0YD5 | 制造商:Rochester Electronics LLC 功能描述: 制造商:RF Micro Devices Inc 功能描述: |
| MIC5301-3.0YD5 TR | 功能描述:低压差稳压器 - LDO 150mA Single LDO Thin SOT-23-5 (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 |
| MIC5301-3.0YD5TR | 制造商:Micrel 功能描述:LDO Regulator Positive 3V 0.15A |
| MIC5301-3.0YD5-TR | 功能描述:Linear Voltage Regulator IC Positive Fixed 1 Output 3V 150mA TSOT-23-5 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 电流 - 输出:150mA 电压 - 跌落（典型值）:0.04V @ 150mA 稳压器数:1 电压 - 输入:最高 5.5V 电流 - 限制（最小值）:275mA 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:SOT-23-5 细型，TSOT-23-5 供应商器件封装:TSOT-23-5 标准包装:1 |
| MIC5301-3.0YMT TR | 功能描述:低压差稳压器 - LDO 150mA Single LDO 1.6mm x 1.6mm Thin MLF (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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