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| 型号： | MIC4681-5.0BM |
| 厂商： | Micrel Inc |
| 文件页数： | 13/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK 5V 1A 8SOIC |
| 标准包装： | 380 |
| 系列： | SuperSwitcher™ |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 5V |
| 输入电压： | 4 V ~ 30 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 200kHz |
| 电流 - 输出： | 1A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 8-SOIC |
MIC4681
T A = ambient temperature
T A(max) = maximum ambient operating temperature
for the specific design.
Calculating the maximum junction temperature given a
maximum ambient temperature of 65 ° C:
T J = 1.064 × 20 ° C/W + (45 ° C – 25 ° C) + 65 ° C
T J = 106.3 ° C
This value is within the allowable maximum operating junc-
tion temperature of 125 ° C as listed in “ Operating Ratings. ”
Typical thermal shutdown is 160 ° C and is listed in “ Electrical
Characteristics. ”
Layout Considerations
Layout is very important when designing any switching regu-
lator. Rapidly changing currents through the printed circuit
board traces and stray inductance can generate voltage
transients which can cause problems.
To minimize stray inductance and ground loops, keep trace
lengths, indicated by the heavy lines in Figure 5, as short as
possible. For example, keep D1 close to pin 3 and pins 5
through 8, keep L1 away from sensitive node FB, and keep
Micrel
C IN close to pin 2 and pins 5 though 8. See “ Applications
Information: Thermal Considerations ” for ground plane lay-
out.
The feedback pin should be kept as far way from the switching
elements (usually L1 and D1) as possible.
A circuit with sample layouts are provided. See Figures 6a
though 6e. Gerber files are available upon request.
V IN
+4V to +30V
C IN
2
1
MIC4681BM
IN SW
SHDN FB
3
4
L1
68 μ H
C OUT
V OUT
R1
Power
SOP-8
GND
5 6 7 8
D1
R2
GND
Figure 5. Critical Traces for Layout
J1
J2
V IN
4V to +30V
C1
22 μ F
35V
J3
GND
OFF
ON
JP1
C2
0.1 μ F
50V
2
1
U1 MIC4681BM
IN SW
SHDN FB
GND
SOP-8 5 – 8
3
4
L1
68 μ H
D1 R6
B340A optional
or 1
SS36
R1
3.01k
R2
6.49k
3
JP2a
C3* 1800pF / 50V
optional
R3 R4 R5
2.94k 1.78k 976 ?
5 7
JP2b JP2c JP2d
C4
220 μ F
10V
V OUT
1A
C5
0.1 μ F
50V
1.8V
2.5V
3.3V
5.0V
J4
* C3 can be used to provide additional stability
2
4
6
8
GND
and improved transient response.
Figure 6a. Evaluation Board Schematic Diagram
April 2005
13
MIC4681
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC4681BM | 功能描述:IC REG BUCK ADJ 1A 8SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:SuperSwitcher™ 标准包装:20 系列:SIMPLE SWITCHER® 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:12V 输入电压:4 V ~ 60 V PWM 型:电压模式 频率 - 开关:52kHz 电流 - 输出:1A 同步整流器:无 工作温度:-40°C ~ 125°C 安装类型:通孔 封装/外壳:16-DIP（0.300"，7.62mm） 包装:管件 供应商设备封装:16-DIP 其它名称:*LM2575HVN-12LM2575HVN-12 |
| MIC4681BM TR | 功能描述:IC REG BUCK ADJ 1A 8SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:SuperSwitcher™ 标准包装:20 系列:SIMPLE SWITCHER® 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:12V 输入电压:4 V ~ 60 V PWM 型:电压模式 频率 - 开关:52kHz 电流 - 输出:1A 同步整流器:无 工作温度:-40°C ~ 125°C 安装类型:通孔 封装/外壳:16-DIP（0.300"，7.62mm） 包装:管件 供应商设备封装:16-DIP 其它名称:*LM2575HVN-12LM2575HVN-12 |
| MIC4681YM | 功能描述:直流/直流开关调节器 2A Peak SuperSwitcher in SO-8 (Lead Free) RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MIC4681YM TR | 功能描述:直流/直流开关调节器 2A Peak SuperSwitcher in SO-8 (Lead Free) RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MIC4682 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:PRECISION CURRENT LIMIT SO-8 SUPERSWITCHER BUCK REGULATOR |
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