ADP5020ACPZ-R7 datasheet(24/28 Pages) AD

24 / 28 page

ADP5020

Rev. 0 | Page 24 of 2

PCB BOARD LAYOUT RECOMMENDATIONS

•

Place the input and output capacitors, C1, C2, C3, C4, and

C5, as close as possible to the respective ADP5020 pin, and

make the grounding connection to the ADP5020 ground

pins as short as possible.

•

Connect C3, C5, and C6 to the analog ground, and connect

C1, C2, and C4 to the power ground.

•

Place the L1 and L2 inductors as close as possible to the

respective output pins.

•

The power and analog ground planes are recommended to

keep the noise low. Use one layer for power ground and one

layer for analog ground. Tie the power and analog grounds

at a single point.

•

Use wide traces to connect the inductor and the input and

output capacitors.

•

Add the L3 inductor and the C8 capacitor, if needed, to

improve the LDO noise rejection at the switching fre-

quency of the Buck 1 regulator (3 MHz) because the LDO

PSRR typically degrades at higher frequencies. If switching

noise is not an issue, remove the L3 inductor.

EXTERNAL COMPONENT LIST

Table 19. Recommended External Components List

Reference

Designator

Description

Size

Proposed Vendor

Vendor Part No.

C1, C4

10 μF, X5R, 6.3 V, ±20%

0603

Murata

GRM188R60J106M

C1, C4

10 μF, X5R, 6.3 V, ±20%

0603

Taiyo Yuden

JMK107BJ106MA

4.7 μF, X5R, 6.3 V, ±10%

0603

Murata

GRM188R60J475K

1.0 μF, X5R, 6.3 V, ±10%

0603

Murata

GRM155R60J105K

0.1 μF, X5R, 10 V, ±10%

0402

Murata

GRM155R61A104K

1.0 μF, X5R, 6.3 V, ±10%

0603

Murata

GRM155R60J105K

2.2 μH, DCR = 0.13 Ω, IDC = 1 A

2.5 mm × 1.8 mm × 1.2 mm

Taiyo Yuden

BRL2518T2R2M

2.2 μH, DCR = 0.23 Ω, IDC = 0.53 A

2.0 mm × 1.2 mm × 1.0 mm

Taiyo Yuden

BRL2012T2R2M

R1, R2

10 kΩ, 1%, thick film resistor

0402

KOA Speer Electronics

RK73H1ETTP1002F

ADP5020ACPZ-R7 Datasheet(PDF) 24 Page - Analog Devices

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