MIC4681_05 MICREL [Micrel Semiconductor], MIC4681_05 Datasheet - Page 15

• Manufacturer Part Number: MIC4681_05
• Description: 2A-Peak SuperSwitcher SOP-8 Buck Regulator
• Manufacturer: MICREL [Micrel Semiconductor]

Applications Circuits*
For continuously updated circuits using the MIC4681, see Application Hint 37 at www.micrel.com.
* See Application Hint 37 at www.micrel.com for bills of material.
April 2005
MIC4681
SHUTDOWN
+4.5V to +17V
ENABLE
+30V max.
GND
J1
J3
100 F
22 F
20V
35V
C1
C1
OFF
+12V
GND
ON
J1
J2
C6
0.1 F
50V
S1
NKK G12AP
100nF
C4
68 F
20V
Figure 7. Constant Current and Constant Voltage Battery Charger
2
1
C2
SOP-8
IN
SHDN
U1 MIC4681
GND
Figure 8. +12V to –12V/150mA Buck-Boost Converter
C5
33 F
35V
2
1
SOP-8
5–8
IN
SHDN
U1 MIC4681
SW
FB
2
1
GND
SOP-8
IN
SHDN
3
4
MIC4417BM4
Figure 9. 5V to 3.3V/5A Power Supply
5–8
U1 MIC4681
SW
GND
FB
5–8
3
4
U2
R1
1k
1%
SW
FB
LM4041DIM3-1.2
3
4
D1
MMBR140LT3
D1
5A
100 H
L1
D1
ES1B
1A 100V
Si4425DY
Q1
15
33 H
L1
50 H
470 F
L1*
1N4148
6.3V
C2
D3
* I
C3
220 F
10V
SAT
C3
0.022 F
50V
U2
10k
= 7.5A
R6
C3
470 F
6.3V
C5
220nF
0.100
R4
16.2k
R5
221k
R1
8.87k
R2
1k
R1
20m
R3
1k
1%
R2
4
3
R7
4.99k
R4
1k
1%
R5
16k
1%
C1
68 F
20V
5
2
10nF
C4
MIC6211BM5
U3
16k 1%
MIC6211BM5
–12V/150mA
C2
0.1 F
R6
1N4148
U3
C4
1000pF
D2
GND
J3
J4
1N4148
D2
R2
3.01k
R3
976
3.01k
1.78k
1%
1%
R7
R8
800mA 5%
5V 2%
GND
J2
J4
MIC4681
3.3V/5A
C5
0.1 F
GND
Micrel