ADP2121 datasheet(19/20 Pages) AD

19 / 20 page

ADP2121

Rev. B | Page 19 of 20

PCB LAYOUT GUIDELINES

VIN

MODE

ADP2121

CIN

GND

COUT

VOUT

3.4mm

2.5mm

Figure 56. Solution Size with a 1008 Inductor

2.0mm

VIN

MODE

ADP2121

CIN

GND

COUT

VOUT

2.65mm

Figure 57. Solution Size with a 0805 Inductor

1.8mm

2.2mm

COUT

VIN

MODE

ADP2121

CIN

GND

VOUT

Figure 58. Solution Size with a 0603 Inductor

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.

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