ADP1871 datasheet(34/44 Pages) AD

Part #	ADP1871

Description	Synchronous Buck Controller with Constant On-Time and Valley Current Mode

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Manufacturer	AD [Analog Devices]

Direct Link	http://www.analog.com

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34 / 44 page

ADP1870/ADP1871

Rev. 0 | Page 34 of 44

OUTPUT CAPACITORS

ARE MOUNTED ON THE

RIGHTMOST AREA OF

THE EVB, WRAPPING

BACK AROUND TO THE

MAIN POWER GROUND

PLANE, WHERE IT MEETS

WITH THE NEGATIVE

TERMINALS OF THE

INPUT CAPACITORS

ARE MOUNTED CLOSE

TO DRAIN OF Q1/Q2

AND SOURCE OF Q3/Q4.

BYPASS POWER CAPACITOR (C1)

FOR VREG BIAS DECOUPLING

AND HIGH FREQUENCY

CAPACITOR (C2) AS CLOSE AS

POSSIBLE TO THE IC.

SENSITIVE ANALOG

COMPONENTS

LOCATED FAR

FROM THE NOISY

POWER SECTION.

SEPARATE ANALOG GROUND

PLANE FOR THE ANALOG

COMPONENTS (THAT IS,

COMPENSATION AND

FEEDBACK RESISTORS).

Figure 85. Overall Layout of the ADP1870 High Current Evaluation Board

Similar Part No. - ADP1871

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Cirrus Logic	ADP1873-0.3-EVALZ	1Mb / 10P	Evaluation Kit Rev A
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Analog Devices	ADP1874-0.3-EVALZ	2Mb / 44P	Synchronous Buck Controller with Constant On-Time and Valley Current Mode REV. 0

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