ADP5600ACPZ-R7 datasheet(22/25 Pages) AD

Part #	ADP5600ACPZ-R7

Description	Interleaved Inverting Charge Pump with Negative LDO Regulator

PDF	25 Pages

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Manufacturer	AD [Analog Devices]

Direct Link	http://www.analog.com

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22 / 25 page

ADP5600

Data Sheet

Rev. 0 | Page 22 of 25

If LDO is the only load of CPOUT and it has not reached its

dropout region then the LDO can be represented by a constant

current source and the effective circuit at the charge pump

output is shown in Figure 62.

Figure 62. Simplified Circuit of the Output

upon Removal of External Clock on SYNC

The effective circuit is similar to a simple discharging of a

capacitor using a current source, ICPOUT. This drop can be

estimated using the following equation:

VSYNCOFF = (ICPOUT × tSYNCOFF)/CCPOUT

where:

VSYNCOFF is the drop from the initial CPOUT voltage.

tSYNCOFF is 189.63 µs (typical).

ICPOUT is the total current being pulled out of the CCPOUT

capacitor.

CCPOUT is the effective capacitance at CPOUT, this includes

tolerance, dc bias effect, and temperature coefficient.

VCPOUT

CCPOUT

ADP5600ACPZ-R7 Datasheet(PDF) 22 Page - Analog Devices