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參數資料
| 型號： | MIC4682BM |
| 廠商： | MICREL INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | PRECISION CURRENT LIMIT SO-8 SUPERSWITCHER BUCK REGULATOR |
| 中文描述： | 1.1 A SWITCHING REGULATOR, 220 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | SOIC-8 |
| 文件頁數： | 12/15頁 |
| 文件大?。?/td> | 226K |
| 代理商： | MIC4682BM |
MIC4682
Micrel
October 2003
12
M0334-102203
L
SW
L1
68
μ
H
IN
FB
GND
SHDN
C
OUT
R1
R2
I
SET
D1
V
OUT
MIC4682BM
GND
C
IN
V
+4V to +34V
Power
SOP-8
2
6
7
3
1
8
5
4
Figure 4. Critical Traces for Layout
SW
L1
68
μ
H
IN
GND
GND
GND
SHDN
FB
ISET
D1
B340A
J3
V
OUT
J4
GND
U1
MIC4682BM
JP1 1-2=OFF
JP1 2-3-ON
C3
0.1
F
50V
J1
V
IN
4V to 34V
2
6
7
1
2
1
1
2
8
5
4
3
2
1
3
J2
GND
JP1
ON
OFF
C5
220
μ
F
10V
C6
Option
C4
Option
R5
6.49k
JP2a
1.8V
R4
2.94k
R1
3.01k
R2
976
C2
10
F
50V
C1
10
F
50V
C7
0.1
μ
F
50V
JP2b
2.5V
JP2d
5.0V
2
1
4
3
R3
1.78k
JP2c
3.3V
6
5
8
7
R8
option
JP3c
2.0A
R7
16.2k
R6
25k
R9
10M
JP3b
1.0A
JP3a
0.6A
2
1
4
3
6
5
Figure 5a. Evaluation Board Schematic Diagram
T
C
=
“
pin
”
temperature measurement taken at the
entry point of pins 6 or 7.
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
= 0.936
×
20
°
C/W + (45
°
C
–
25
°
C) + 65
°
C
T
J
= 103.7
°
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 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 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 5a
though 5e. Gerber files are available upon request.
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