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| 型号： | MIC5270-5.0YM5 TR |
| 厂商： | Micrel Inc |
| 文件页数： | 7/8页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO -5V .1A SOT23-5 |
| 标准包装： | 1 |
| 稳压器拓扑结构： | 负，固定式 |
| 输出电压： | -5V |
| 输入电压： | -16 V ~ -3.3 V |
| 电压 - 压降（标准）： | 0.5V @ 100mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 100mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SC-74A，SOT-753 |
| 供应商设备封装： | SOT-23-5 |
| 包装： | 标准包装 |
| 产品目录页面： | 1100 (CN2011-ZH PDF) |
| 其它名称： | 576-1294-6 |
MIC5270
Applications Information
The MIC5270 is a general-purpose negative regulator that
can be used in any system that requires a clean negative
Micrel, Inc.
minimum footprint board layout, is 235 ° C/W. The maximum
power dissipation at an ambient temperature of 25 ° C can be
determined with the following equation:
voltage from a negative output. This includes post regulating
of DC-DC converters (transformer based or charge pump
based voltage converters). These negative voltages typically
require a negative low-dropout voltage regulator to provide a
clean output from typically noisy lines.
Input Capacitor
P D(max) =
P D(max) =
T J(max) ? T A
θ JA
125 ° C ? 25 ° C
235 ° C/W
P D ( IN ? V OUT ) OUT + V IN ? I GND
425mW = ( V IN ) IN × 1mA
425mW = ( 100mA × V IN IN ) ? 500mW
A 1μF input capacitor should be placed from IN to GND if
there is more than 2 inches of wire or trace between the input
and the AC filter capacitor, or if a battery is used as the input.
Output Capacitor
The MIC5270 requires an output capacitor for stable opera-
tion. A minimum of 1 μ F of output capacitance is required. The
output capacitor can be increased without limitation to im-
prove transient response. The output does not require ESR
to maintain stability, therefore a ceramic capacitor can be
used. High-ESR capacitors may cause instability. Capacitors
with an ESR of 3 ? or greater at 100kHz may cause a high
frequency oscillation.
Low-ESR tantalums are recommended due to the tight ca-
pacitance tolerance over temperature.
Ceramic chip capacitors have a much greater dependence
on temperature, depending upon the dielectric. The X7R is
recommended for ceramic capacitors because the dielectric
will change capacitance value by approximately 15% over
temperature. The Z5U dielectric can change capacitance
value by as much 50% over temperature, and the Y5V
dielectric can change capacitance value by as much as 60%
over temperature. To use a ceramic chip capacitor with the
Y5V dielectric, the value must be much higher than a tanta-
lum to ensure the same minimum capacitor value over
temperature.
No-Load Stability
The MIC5270 does not require a load for stability.
Thermal Considerations
Absolute values will be used for thermal calculations to clarify
what is meant by power dissipation and voltage drops across
P D(max) = 425mW
The actual power dissipation of the regulator circuit can be
determined using one simple equation.
= V I
Substituting P D(max) , determined above, for P D and solving
for the operating conditions that are critical to the application
will give the maximum operating conditions for the regulator
circuit. The maximum power dissipation number cannot be
exceeded for proper operation of the device. The maximum
input voltage can be determined using the output voltage of
5.0V and an output current of 100mA. Ground current, of 1mA
for 100mA of output current, can be taken from the “Electrical
Characteristics ” section of the data sheet.
? 5.0V 100mA + V
+ 1mA × V
925mW = 101mA × V IN
V IN = 9.16Vmax
Therefore, a –5.0V application at 100mA of output current
can accept a maximum input voltage of –9.16V in a SOT-23-5
package. For a full discussion of heat sinking and thermal
effects on voltage regulators, refer to Regulator Thermals
section of Micrel’s “Designing with Low-Dropout Voltage
Regulators ” handbook.
Adjustable Regulator Application
MIC5270BM
the part.
Proper thermal design for the MIC5270-5.0BM5 can be
accomplished with some basic design criteria and some
–V IN
5
2
–IN –OUT
GND ADJ
4
3
R2
–V OUT
simple equations. The following information must be known
to implement your regulator design:
V IN = input voltage
V OUT = output voltage
I OUT = output current
T A = ambient operating temperature
I GND = ground current
R1
Figure 1. Adjustable Voltage Application
The MIC5270BM5 can be adjusted from 1.20V to 14V by
using two external resistors (Figure 1). The resistors set the
output voltage based on the following equation:
Maximum power dissipation can be determined by knowing
the ambient temperature, T A , the maximum junction tem-
perature, 125 ° C, and the thermal resistance, junction to
ambient. The thermal resistance for this part, assuming a
May 2005
7
? V OUT ? = V REF (1 +
Where V REF = 1.20V
R 2
R 1
)
M9999-052705
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC5270BM5 TR | 功能描述:IC REG LDO NEG ADJ .1A SOT23-5 RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:3,000 系列:- 稳压器拓扑结构:正，固定式 输出电压:3.8V 输入电压:最高 16V 电压 - 压降（标准）:0.3V @ 80mA 稳压器数量:1 电流 - 输出:80mA 电流 - 限制（最小）:- 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:SC-74A，SOT-753 供应商设备封装:SOT-23-5 包装:带卷 (TR) 其它名称:MIC5203-3.8BM5TRMIC5203-3.8BM5TR-ND |
| MIC5270YM5 | 制造商:Rochester Electronics LLC 功能描述: 制造商:RF Micro Devices Inc 功能描述: 制造商:Micrel Inc 功能描述: |
| MIC5270YM5 TR | 功能描述:低压差稳压器 - LDO 100mA Negative uCap LDO Regulator(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 |
| MIC5270YM5TR | 制造商:Micrel 功能描述:LDO Regulator Neg -1.2V to -14V 0.1A |
| MIC5270YM5-TR | 功能描述:Linear Voltage Regulator IC Negative Adjustable 1 Output -1.2 V ~ -14 V 100mA SOT-23-5 制造商:microchip technology 系列:- 包装:剪切带（CT） 零件状态:有效 稳压器拓扑:负，可调式 电压 - 输出:-1.2 V ~ -14 V 电流 - 输出:100mA 电压 - 跌落（典型值）:0.5V @ 100mA 稳压器数:1 电压 - 输入:-3.3 V ~ -16 V 电流 - 限制（最小值）:- 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:SC-74A，SOT-753 供应商器件封装:SOT-23-5 标准包装:1 |
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