参数资料
| 型号： | MIC4682BM TR |
| 厂商： | Micrel Inc |
| 文件页数： | 12/15页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK 2A 8SOIC |
| 标准包装： | 2,500 |
| 系列： | SuperSwitcher™ |
| 类型： | 降压（降压） |
| 输出数： | 1 |
| 输入电压： | 4 V ~ 34 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 200kHz |
| 电流 - 输出： | 2A |
| 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： | 带卷 (TR) |
| 供应商设备封装： | 8-SOIC |
| 其它名称： | MIC4682BMTR MIC4682BMTR-ND |
Micrel, Inc.
MIC4682
P D =
P OUT
η
? P OUT
Calculating the maximum junction temperature given a
maximum ambient temperature of 65°C:
P D =
? 5 W
5W
0.81
P D = 1.17W
A worst-case rule of thumb is to assume that 80% of the
total output power dissipation is in the MIC4682 (P D(IC) )
and 20%is in the diode-inductor-capacitor circuit.
P D(IC) = 0.8 P D
P D(IC) = 0.8 × 1.17W
P D(IC) = 0.936W
Calculate the worst-case junction temperature:
T J = P D(IC) θ JC + (T C – T A ) + T A(max)
T J = 0.936 × 20°C/W + (45°C – 25°C) + 65°C
T J = 103.7°C
This value is within the allowable maximum operating
junction 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
regulator. 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
where:
T J = MIC4682 junction temperature
P D(IC) = MIC4682 power dissipation
θ JC = junction-to-case thermal resistance.
trace lengths, indicated by the heavy lines in Figure 4, as
short as possible. For example, D1 should be close to
pin 7 and pin 8. C IN should be close to pin 5 and pin 6.
See “Applications Information: Thermal Considerations”
for ground plane layout.
The
θ JC
for the MIC4682’s power-SOIC-8 is
The feedback pin should be kept as far way from the
approximately 20°C/W.
T C = “pin” temperature measurement taken at
the entry point of pins 6 or 7.
T A = ambient temperature
switching elements (usually L1 and D1) as possible.
A circuit with sample layouts are provided. See Figures
5a though 5e. Gerber files are available upon request.
T A(max)
= maximum ambient operating
temperature for the specific design.
V IN
+4V to +34V
5
MIC4682BM
IN SW
8
L1
68μH
V OUT
C IN
4
SHDN
FB
1
C OUT
R1
Power
SOIC-8
GND I SET
2 6 7 3
D1
R2
GND
Figure 4. Critical Traces for Layout
R1
J1
V IN
4V to 34V
C1
10μF
50V
J2
C2
10μF
50V
C3
0.1μF
50V
OFF
ON
1
3
JP1 1-2=OFF
JP1 2-3-ON
2
JP1
R9
10M
5
4
3
U1 MIC4682BM
IN SW
SHDN GND
ISET FB
8
7
1
1
2
L1
68μH
1 2
D1
B340A
3.01k
C4
Option
C5
220μF
10V
C6
Option
C7
0.1μF
50V
J3
V OUT
GND
R5
R4
R3
R2
R8
option
R7
16.2k
R6
25k
GND
2
GND
6
6.49k
2.94k
1.78k
976
2
JP3c
4
JP3b
6
JP3a
2
JP2a
4
JP2b
6
JP2c
8
JP2d
2.0A
1.0A
0.6A
1.8V
2.5V
3.3V
5.0V
1
3
5
1
3
5
7
J4
GND
Figure 5a. Evaluation Board Schematic Diagram
June 2007
12
M9999-061507
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC4682YM | 功能描述:直流/直流开关调节器 Precision Current Limit SO-8 Super Switcher (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 |
| MIC4682YM TR | 功能描述:直流/直流开关调节器 Precision Current Limit SO-8 Super Switcher (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 |
| MIC4684 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:2A High-Efficiency SuperSwitcher Buck Regulator |
| MIC4684_10 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:2A High-Efficiency SuperSwitcher Buck Regulator |
| MIC4684-3.3BM | 功能描述:IC REG BUCK 3.3V 2A 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 |
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