ADP5020ACPZ-R7 datasheet(22/28 Pages) AD

Part #	ADP5020ACPZ-R7

Description	Power Management Unit for Imaging Modules

PDF	28 Pages

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Manufacturer	AD [Analog Devices]

Direct Link	http://www.analog.com

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22 / 28 page

ADP5020

Rev. 0 | Page 22 of 2

LDO INPUT FILTER

To improve the LDO input-to-output ripple suppression in the

critical switching frequency range of the buck converters, it may be

necessary to add an LC filter tuned to 1 MHz, as shown in

Figure 28. Additional tests and simulation must be performed

to assess if this filter is necessary.

The filter resonance frequency is determined by the following

equation:

(3)

where L3 = 250 nH, assuming that fLC = 1 MHz and C8 = 100 nF.

The inductor must be able to withstand the LDO load current,

including the overload condition, which is limited to 400 mA.

VBATT

SW1

VOUT1

2.2µH

3.3V

2.8V

LDO

INPUT FILTER

10µF

0.1µF

1µF

VDD3

VOUT1

VOUT3

BUCK 1

LDO

ADP5020

Figure 28. Optional LDO Input Filter

ADP5020ACPZ-R7 Datasheet(PDF) 22 Page - Analog Devices