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參數(shù)資料
| 型號： | MIC4681 |
| 廠商： | Micrel Semiconductor,Inc. |
| 英文描述： | 2A-Peak SuperSwitcher⑩ SOP-8 Buck Regulator |
| 中文描述： | 甲峰SuperSwitcher⑩SOP - 8和降壓穩(wěn)壓器 |
| 文件頁數(shù)： | 13/19頁 |
| 文件大?。?/td> | 395K |
| 代理商： | MIC4681 |
February 2001
13
MIC4681
MIC4681
Micrel
L
SW
L1
68
μ
H
IN
FB
GND
5
6
SHDN
C
OUT
R1
R2
D1
V
OUT
MIC4681BM
GND
C
IN
V
+4V to +30V
Power
SOP-8
7
8
4
3
2
1
Figure 5. Critical Traces for Layout
SW
L1
68
μ
H
IN
FB
GND
SHDN
D1
B340A
or
SS36
J2
V
1A
J4
GND
U1
MIC4681BM
C2
0.1
μ
F
50V
C1
22
μ
F
35V
J3
GND
J1
V
4V to +30V
SOP-8
5
–
8
4
3
2
1
JP1
ON
OFF
C4
220
μ
F
10V
C3* 1800pF / 50V
optional
C5
0.1
μ
F
50V
R1
3.01k
R2
6.49k
JP2a
1.8V
R6
optional
R3
2.94k
R4
1.78k
R5
976
JP2b
2.5V
JP2c
3.3V
JP2d
5.0V
1
2
3
4
5
6
7
8
* C3 can be used to provide additional stability
and improved transient response.
Figure 6a. Evaluation Board Schematic Diagram
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
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.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MIC4681_05 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:2A-Peak SuperSwitcher SOP-8 Buck Regulator |
| MIC4681-2.5BM | 功能描述:IC REG BUCK 2.5V 1A 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:SuperSwitcher™ 標(biāo)準(zhǔn)包裝:20 系列:SIMPLE SWITCHER® 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:12V 輸入電壓:4 V ~ 60 V PWM 型:電壓模式 頻率 - 開關(guān):52kHz 電流 - 輸出:1A 同步整流器:無 工作溫度:-40°C ~ 125°C 安裝類型:通孔 封裝/外殼:16-DIP（0.300"，7.62mm） 包裝:管件 供應(yīng)商設(shè)備封裝:16-DIP 其它名稱:*LM2575HVN-12LM2575HVN-12 |
| MIC4681-2.5BM TR | 功能描述:IC REG BUCK 2.5V 1A 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:SuperSwitcher™ 標(biāo)準(zhǔn)包裝:20 系列:SIMPLE SWITCHER® 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:12V 輸入電壓:4 V ~ 60 V PWM 型:電壓模式 頻率 - 開關(guān):52kHz 電流 - 輸出:1A 同步整流器:無 工作溫度:-40°C ~ 125°C 安裝類型:通孔 封裝/外殼:16-DIP（0.300"，7.62mm） 包裝:管件 供應(yīng)商設(shè)備封裝:16-DIP 其它名稱:*LM2575HVN-12LM2575HVN-12 |
| MIC4681-3.3BM | 功能描述:IC REG BUCK 3.3V 1A 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:SuperSwitcher™ 標(biāo)準(zhǔn)包裝:20 系列:SIMPLE SWITCHER® 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:12V 輸入電壓:4 V ~ 60 V PWM 型:電壓模式 頻率 - 開關(guān):52kHz 電流 - 輸出:1A 同步整流器:無 工作溫度:-40°C ~ 125°C 安裝類型:通孔 封裝/外殼:16-DIP（0.300"，7.62mm） 包裝:管件 供應(yīng)商設(shè)備封裝:16-DIP 其它名稱:*LM2575HVN-12LM2575HVN-12 |
| MIC4681-3.3BM TR | 功能描述:IC REG BUCK 3.3V 1A 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:SuperSwitcher™ 標(biāo)準(zhǔn)包裝:20 系列:SIMPLE SWITCHER® 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:12V 輸入電壓:4 V ~ 60 V PWM 型:電壓模式 頻率 - 開關(guān):52kHz 電流 - 輸出:1A 同步整流器:無 工作溫度:-40°C ~ 125°C 安裝類型:通孔 封裝/外殼:16-DIP（0.300"，7.62mm） 包裝:管件 供應(yīng)商設(shè)備封裝:16-DIP 其它名稱:*LM2575HVN-12LM2575HVN-12 |
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