M12 Hardware Design
M12_Hardware_Design_V3.3 - 26 -
VBAT
C2C1
+
C3 C4
GND
100uF 100nF 10pF
0603
33pF
0603
Figure 4: Reference circuit for the VBAT input
3.3.3. Reference design for power supply
The power design for the module is very important, since the performance of power supply for the
module largely depends on the power source. The power supply is capable of providing the
sufficient current up to 2A at least. If the voltage drop between the input and output is not too high,
it is suggested to use a LDO as module’s power supply. If there is a big voltage difference between
the input source and the desired output (VBAT), a switcher power converter is preferred to use as
a power supply.
The following figure shows a reference design for +5V input power source. The designed output
for the power supply is 4.16V and the maximum load current is 3A. In addition, in order to get a
stable output voltage, a zener diode is placed close to the pins of VBAT. As to the zener diode, it is
suggested to use a zener diode which reverse zener voltage is 5.1V and dissipation power is more
than 1 Watt.
Figure 5: Reference circuit for power supply
DC_IN
C1
C2
MIC29302WU U1
IN OUT
EN
GND
ADJ
2 4
1
3
5
VBAT
100nF
C3
470uF
C4
100nF
R1
D1
120K
51K
R2
470uF
5.1V
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