Micrel, Inc.
MIC45208 Evaluation Board
August 19, 2015
2
Revision 2.0
Features
Feedback Resistors
The output voltage on the MIC45208 evaluation board,
which is preset to 5.0V, is determined by the feedback
divider:
+
×
=
BOTTOM
REF
OUT
R
R14
1
V
V
Eq. 1
where V
REF
= 0.8V, and R
BOTTOM
is one of R3 thru R9.
Leaving the R
BOTTOM
open by removing all jumpers on the
feedback headers gives a 0.8V output voltage.
All other voltages not listed above can be set by modifying
R
BOTTOM
value according to:
REF
OUT
REF
BOTTOM
V
V
V
R1
R
−
×
=
Eq. 2
Note that the output voltage should not be set to exceed
5V.
Table 1. Typical Values of Some Components
V
OUT
V
IN
R14
(Top Feedback Resistor)
R
(Bottom Feedback Resistor)
C12
(C
ff
)
C
OUT
1.0V
5V to 26V
10kΩ
40.2
kΩ
2.2nF
100µF/6.3V
1.2V
5V to 26V
10kΩ
20kΩ
2.2nF
100µF/6.3V
1.5V
5V to 26V
10kΩ
11.5
kΩ
2.2nF
100µF/6.3V
1.8V
5V to 26V
10kΩ
8.06kΩ
2.2nF
100µF/6.3V
2.5V
5V to 26V
10kΩ
4.75kΩ
2.2nF
100µF/6.3V
3.3V
5V to 26V
10kΩ
3.24kΩ
2.2nF
100µF/6.3V
5V
7V to 26V
10kΩ
1.9kΩ
2.2nF
100µF/6.3V
