TC7662AEPA datasheet(7/14 Pages) MICROCHIP

No de pièce	TC7662AEPA

Description	Charge Pump DC-to-DC Converter

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Fabricant	MICROCHIP [Microchip Technology]

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 2002 Microchip Technology Inc.

DS21468B-page 7

TC7662A

4.2

Output Ripple

ESR also affects the ripple voltage seen at the output.

The total ripple is determined by 2 voltages, A and B,

as shown in Figure 4-2. Segment A is the voltage drop

across the ESR of CR at the instant it goes from being

charged by CP (current flowing into CR) to being dis-

charged through the load (current flowing out of CR).

The magnitude of this current change is 2 x IOUT, hence

the total drop is 2 x IOUT x ESRCR volts. Segment B is

the voltage change across CR during time t2, the half of

the cycle when CR supplies current to the load. The

drop at B is IOUT x t2/CR volts. The peak-to-peak ripple

voltage is the sum of these voltage drops:

FIGURE 4-2:

OUTPUT RIPPLE

4.3

Paralleling Devices

Any number of TC7662A voltage converters may be

paralleled to reduce output resistance (Figure 4-3).

The reservoir capacitor, CR, serves all devices, while

each device requires its own pump capacitor, CP. The

resultant output resistance would be approximately:

4.4

Cascading Devices

The TC7662A may be cascaded as shown (Figure 4-4)

to produce larger negative multiplication of the initial

supply voltage. However, due to the finite efficiency of

each device, the practical limit is 10 devices for light

loads. The output voltage is defined by:

VOUT = – n (VIN)

where n is an integer representing the number of

devices cascaded. The resulting output resistance

would be approximately the weighted sum of the

individual TC7662A ROUT values.

FIGURE 4-3:

PARALLELING DEVICES LOWERS OUTPUT IMPEDANCE

FIGURE 4-4:

INCREASED OUTPUT VOLTAGE BY CASCADING DEVICES

1

2 x fPUMP x CR

VRIPPLE ≅ (

+ 2 x ESRCR x IOUT)

t2

t1

B

A

V

0

-(VDD)

ROUT =

ROUT (of TC7662A)

n (number of devices)

1

2

3

4

8

7

6

5

TC7662A

VDD

1

2

3

4

8

7

6

5

TC7662A

RL

C2

C1

"n"

"1"

+

C1

1

2

3

4

8

7

6

5

VDD

1

2

3

4

8

7

6

5

10

µF

10

µF

"n"

"1"

10

µF

V

OUT*

+

TC7662A

*VOUT = -nVDD

10

µF

Numéro de pièce similaire - TC7662AEPA

Fabricant	No de pièce	Fiches technique	Description
TelCom Semiconductor, I...	TC7662AEPA	62Kb / 5P	CHARGE PUMP DC-TO-DC CONVERTER
Microchip Technology	TC7662AEPA	53Kb / 7P	CHARGE PUMP DC-TO-DC CONVERTER 2001
Microchip Technology	TC7662AEPA	231Kb / 16P	Charge Pump DC-to-DC Converter 11/29/12

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Description similaire - TC7662AEPA

Fabricant	No de pièce	Fiches technique	Description
Microchip Technology	TC7662A	231Kb / 16P	Charge Pump DC-to-DC Converter 11/29/12
TelCom Semiconductor, I...	TC7662A	62Kb / 5P	CHARGE PUMP DC-TO-DC CONVERTER
Microchip Technology	TC7662A	53Kb / 7P	CHARGE PUMP DC-TO-DC CONVERTER 2001
Microchip Technology	TC7660	91Kb / 12P	CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER 2001
ON Semiconductor	MC7660	191Kb / 12P	Charge Pump DC-to-DC Voltage Converter February, 2000 ??Rev. 2
Microchip Technology	TC1044S	92Kb / 11P	Charge Pump DC-TO-DC Voltage Converter 2001
TelCom Semiconductor, I...	TC1044S	141Kb / 8P	CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER
TelCom Semiconductor, I...	TC7662B	133Kb / 9P	CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER
Microchip Technology	TC7660	1Mb / 20P	Charge Pump DC-to-DC Voltage Converter 11/29/11
Microchip Technology	TC7660	386Kb / 18P	Charge Pump DC-to-DC Voltage Converter 2002

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