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MIC4690BM Datasheet(PDF) 8 Page - Micrel Semiconductor

Part # MIC4690BM
Description  500kHz 1A SuperSwitcher Buck Regulator
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Manufacturer  MICREL [Micrel Semiconductor]
Direct Link  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

MIC4690BM Datasheet(HTML) 8 Page - Micrel Semiconductor

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MIC4690
Micrel
MIC4690
8
June 2001
Applications Information
Adjustable Regulators
Adjustable regulators require a 1.23V feedback signal. Rec-
ommended voltage-divider resistor values for common out-
put voltages are included in Figure 1b.
For other voltages, the resistor values can be determined
using the following formulas:
VV
R1
R2
1
R1 R2
V
V
1
V
1.23V
OUT
REF
OUT
REF
REF
=+


=−


=
SW
L1
VIN
FB
GND
SHDN
C2
220µF
10V
R1
3.01k
R2
1.27k
D1
2A
40V
5.0V/1A
MIC4690BM
C1
22µF
35V
+6.8V to +30V
SHUTDOWN
ENABLE
5Ð8
4
3
2
1
Power
SOP-8
18µH
Figure 1a. Adjustable Regulator Circuit
Bill of Material Matrix
V
OUT
R1(1)
R2(1)
V
IN
C
IN
D1
L1
C
OUT
I
OUT
5.0V
3.01k
976
6.8V-30V
22
µF, 35V
2A, 40V
18
µH
220
µF, 10V
see SOA
Vishay-Dale
Schotty
Sumida
Vishay-Dale
595D226X0035D2T
SS24
CDRH6D38-180ML
594D227X0010D2T
Micro Commercial
5.0V
3.01k
976
6.8V-14V
47
µF, 20V
2A, 20V
18
µH
100
µF, 6.3V
1.0A
Vishay-Dale
Schotty
Sumida
Vishay-Dale
595D476X0020C2T
SS22
CDRH6D38-180ML
595D107X06R3C2T
Micro Commercial
3.3V
3.01k
1.78k
4.9V-14V
47
µF, 20V
2A, 20V
15
µH
120
µF, 4.0V
1.0A
Vishay-Dale
Schotty
Sumida
Vishay-Dale
595D476X0020C2T
SS22
CDRH6D38-150ML
595D127X0004C2T
Micro Commercial
2.5V
3.01k
2.94k
4.25V-14V 47
µF, 20V
2A, 20V
10
µH
120
µF, 4.0V
1.0A
Vishay-Dale
Schotty
Sumida
Vishay-Dale
595D476X0020C2T
SS22
CDRH6D38-100ML
595D127X0004C2T
Micro Commercial
1.8V
3.01k
6.49k
4.0V-14V
47
µF, 20V
2A, 20V
10
µH
120
µF, 4.0V
1.0A
Vishay-Dale
Schotty
Sumida
Vishay-Dale
595D476X0020C2T
SS22
CDRH6D38-100ML
595D127X0004C2T
Micro Commercial
Note 1.
All resistors 1%
Figure 1b. Recommended Components for Common Ouput Voltages


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