ADP2121 Analog Devices, ADP2121 Datasheet - Page 19

• Manufacturer Part Number: ADP2121
• Description: 600 mA, 6 MHz Synchronous Step-Down DC-to-DC Converter
• Manufacturer: Analog Devices

2.5mm
PCB LAYOUT GUIDELINES
2.0mm
Figure 56. Solution Size with a 1008 Inductor
Figure 57. Solution Size with a 0805 Inductor
L1
L1
VOUT
SW
2.65mm
3.4mm
VOUT
SW
MODE
ADP2121
COUT
MODE
ADP2121
COUT
VIN
EN
GND
VIN
CIN
EN
GND
CIN
Rev. B | Page 19 of 20
For high efficiency, good regulation, and stability with the
ADP2121, a well-designed PCB is required.
Use the following guidelines when designing PCBs:
•
•
•
•
Keep the low ESR input capacitor, CIN, close to VIN
and GND.
Keep high current traces as short and as wide as possible.
Avoid routing high impedance traces near any node
connected to SW or near the inductor to prevent radiated
noise injection.
Keep the low ESR output capacitor, COUT, close to FB and
GND of the ADP2121. Long trace lengths from the part to
the output capacitor add series inductance and may cause
instability or increased ripple.
1.8mm
Figure 58. Solution Size with a 0603 Inductor
L1
VOUT
SW
MODE
2.2mm
ADP2121
COUT
EN
VIN
GND
ADP2121
CIN