ADP3610 Просмотр технического описания (PDF) - Analog Devices

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ADP3610

320 mA Switched Capacitor Voltage Doubler

Analog Devices 

ADP3610

Unregulated Voltage Doubler

Figure 20 shows a typical application for the ADP3610 in un-

regulated voltage doubling mode. The inherent limit on the

output voltage for a voltage doubler is two times the input volt-

age. However, due to the losses in the switches and ESR of

capacitors, this scaling factor is somewhat reduced. Figure 21

shows the magnitude of unregulated output voltage as the load

current is increased from 0 mA to 320 mA. This gives a measure

of the equivalent resistance RTOTAL. RTOTAL is comprised of

internal switch resistance and ESR of the capacitors.

CP1

2.2␮F

CIN1

1␮F

INPUT

VIN = 3.3V

CIN2

1␮F

ADP3610

1 VIN

VIN 16

2 SD

VIN 15

3 CM1 CP1 14

4 GND GND 13

5 GND

6 GND

7 CM2

VOUT 12

VOUT 11

CP2 10

8 VIN

VIN 9

OUTPUT

VO = 6.2V

CO @320mA

1␮F

CP2

2.2␮F

Figure 20. Unregulated Voltage Doubler

SLOPE

=

RTOTAL

=

6

– 5.62

0.32

= 1.18⍀

6.0

(5.62, 320 mA)

4.5

3.0

1.5

0

0

100

200

300

400

LOAD CURRENT – mA

VIN = 3 V

Figure 21. Load Regulation

–8–

REV. A

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