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| 型号： | MIC5219YMM |
| 厂商： | Micrel Inc |
| 文件页数： | 12/14页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO ADJ .5A 8-MSOP |
| 标准包装： | 100 |
| 稳压器拓扑结构： | 正，可调式 |
| 输出电压： | 可调 |
| 输入电压： | 2.5 V ~ 12 V |
| 电压 - 压降（标准）： | 0.35V @ 500mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 500mA |
| 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） |
| 供应商设备封装： | 8-MSOP |
| 包装： | 管件 |
| 产品目录页面： | 1098 (CN2011-ZH PDF) |
| 其它名称： | 576-3437 MIC5219YMM-ND |
V IN
V OU T
Micrel, Inc.
P D × 50mA = 0.875 × 173mW
P D × 50mA = 151mW
The power dissipation at 500mA must also be calculated.
P D × 500mA = (5V – 3.3V) 500mA + 5V × 20mA
P D × 500mA = 950mW
This number must be multiplied by the duty cycle at which it
would be operating, 12.5%.
P D × = 0.125 × 950mW
P D × = 119mW
The total power dissipation of the device under these condi -
tions is the sum of the two power dissipation figures.
MIC5219
MIC5219-x.x
IN OUT
EN BYP
GND 2.2μF
470pF
Figure 6. Ultra-Low-Noise Fixed Voltage Regulator
Figure 6 includes the optional 470pF noise bypass capacitor
between BYP and GND to reduce output noise. Note that the
minimum value of C OUT must be increased when the bypass
capacitor is used.
V IN
P D(total) = P D × 50mA + P D × 500mA
P D(total) = 151mW + 119mW
P D(total) = 270mW
The total power dissipation of the regulator is less than the
maximum power dissipation of the SOT-23-5 package at room
temperature, on a minimum footprint board and therefore
would operate properly.
Adjustable Regulator Circuits
MIC5219
IN OUT
EN ADJ
GND
R1
R2
V OU T
1μF
V IN
V OU T
V OUT = 1.242V ?
? R2 ?
? R1
?
V IN
V OU T
Multilayer boards with a ground plane, wide traces near the
pads, and large supply-bus lines will have better thermal
conductivity.
For additional heat sink characteristics, please refer to Mi -
crel “Application Hint 17, Designing P.C. Board Heat Sinks”,
included in Micrel’s Databook. 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.
Fixed Regulator Circuits
MIC5219-x.x
IN OUT
Figure 7. Low-Noise Adjustable Voltage Regulator
Figure 7 shows the basic circuit for the MIC5219 adjustable
regulator. The output voltage is configured by selecting values
for R1 and R2 using the following formula:
+ 1 ?
Although ADJ is a high-impedance input, for best performance,
R2 should not exceed 470kΩ.
MIC5219
IN OUT
EN
BYP
GND
1μF
EN
ADJ
GND
470pF
R1
R2
2.2μF
Figure 5. Low-Noise Fixed Voltage Regulator
Figure 5 shows a basic MIC5219-x.xBMX fixed-voltage regu -
lator circuit. A 1μF minimum output capacitor is required for
basic fixed-voltage applications.
Figure 8. Ultra-Low-Noise Adjustable Application
Figure 8 includes the optional 470pF bypass capacitor from
ADJ to GND to reduce output noise.
June 2009
12
M0371-061809
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相关代理商/技术参数 |
参数描述 |
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| MIC5219YMM TR | 功能描述:低压差稳压器 - LDO 500mA Peak 1% Low Noise LDO(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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| MIC5219YMT-TR | 功能描述:Linear Voltage Regulator IC Positive Adjustable 1 Output Adjustable 500mA 6-TMLF? (2x2) 制造商:microchip technology 系列:- 包装:剪切带（CT） 零件状态:有效 稳压器拓扑:正，可调式 电压 - 输出:可调 电流 - 输出:500mA 电压 - 跌落（典型值）:0.35V @ 500mA 稳压器数:1 电压 - 输入:2.5 V ~ 12 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:6-UDFN 裸露焊盘，6-TMLF? 供应商器件封装:6-TMLF?（2x2） 标准包装:1 |
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