ADP1882ARMZ-0.3-R7 datasheet(33/40 Pages) AD

33 / 40 page

ADP1882/ADP1883

Rev. 0 | Page 33 of 40

LAYOUT CONSIDERATIONS

The performance of a dc-to-dc converter depends highly on how

the voltage and current paths are configured on the printed

circuit board (PCB). Optimizing the placement of sensitive

analog and power components are essential to minimize output

ripple, maintain tight regulation specifications, and reduce

PWM jitter and electromagnetic interference.

Figure 83 shows the schematic of a typical ADP1882/ADP1883

used for a high power application. Blue traces denote high current

pathways. VIN, PGND, and VOUT traces should be wide and

possibly replicated, descending down into the multiple layers.

Vias should populate, mainly around the positive and negative

terminals of the input and output capacitors, alongside the

source of Q1/Q2, the drain of Q3/Q4, and the inductor.

HIGH VOLTAGE INPUT

VIN = 12V

HIGH VOLTAGE INPUT

VDD = 5V

MURATA: (HIGH VOLTAGE INPUT CAPACITORS)

22µF, 25V, X7R, 1210 GRM32ER71E226KE15 L

PANASONIC: (OUTPUT CAPACITORS)

270µF SP-SERIES, 4V, 7m

Ω EEFUE0G271LR

INFINEON MOSFETs (NO CONNECTION FOR Q2/Q4:

BSC042N03MS G (LOWER SIDE)

BSC080N03MS G (UPPER SIDE)

WURTH INDUCTORS:

1µH, 3.3m

Ω, 20A 7443552100

100k

Ω

C12

100nF

VOUT = 1.8V, 15A

22µF

N/A

C23

270µF

C24

270µF

C22

270µF

C21

270µF

C20

270µF

C14 TO C19

N/A

1.0µH

Ω

C13

1.5nF

R1 18.75k

Ω

15k

Ω

VOUT

VIN

BST

COMP/EN

DRVH

GND

PGND

VDD

DRVL

ADP1882/

ADP1883

700pF

70pF

38.1k

Ω

1µF

0.1µF

JP1

Figure 83. ADP1882 High Current Evaluation Board Schematic (Blue Traces Indicate High Current Paths)

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