參數(shù)資料
型號(hào)： MIC4681BM
廠商： MICREL INC
元件分類(lèi)： 穩(wěn)壓器
英文描述： 2A-Peak SuperSwitcher⑩ SOP-8 Buck Regulator
中文描述： 2.1 A SWITCHING REGULATOR, 220 kHz SWITCHING FREQ-MAX, PDSO8
封裝： SOP-8
文件頁(yè)數(shù)： 13/19頁(yè)
文件大小： 395K
代理商： MIC4681BM
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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