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Application Note
BD71837MWV Platform Design Guide
© 2018 ROHM Co., Ltd.
No. 61AN002E Rev.001
May.2018
5.3.1.3. Parts placement for each decoupling capacitor
About the parts placement for each capacitor around BUCK1, the below reference layout can be referred to.
BUCK1_FB should be connected to near output capacitors.
Figure 5.8 BUCK1 Layout Example (Top Layer)
5.3.2. BUCK2 (VDD_ARM)
BUCK2 is a high-efficiency buck converter which converts VSYS (2.7V to 5.5V) voltage to a regulated voltage. This VR can
dynamically change its output voltage setting using the I2C interface. BUCK2 output voltage range is from 0.7V to 1.3V by 10mV
step.
5.3.2.1. Schematic Example
Figure 5.9 BUCK2 Schematic Example
Output Cap
BUCK1_VIN
BUCK1_LX
Input Cap
Feedback
point
Inductor
