MAX660C 데이터 시트보기 (PDF) - Maxim Integrated

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MAX660C

CMOS Monolithic Voltage Conver

Maxim Integrated 

CMOS Monolithic Voltage Converter

Combined Positive Supply Multiplication

and Negative Voltage Conversion

This dual function is illustrated in Figure 5. In this cir-

cuit, capacitors C1 and C3 perform the pump and

reservoir functions respectively for generation of the

negative voltage. Capacitors C2 and C4 are respec-

tively pump and reservoir for the multiplied positive

voltage. This circuit configuration, however, leads to

higher source impedances of the generated supplies.

This is due to the finite impedance of the common

charge-pump driver.

+VIN

8

2 MAX660

3

5

C1

4

6

D1 D1, D2 = 1N4148

VOUT = -VIN

C2

1M

1M

3V LITHIUM BATTERY

DURACELL DL123A

3

8

2

MAX660

150µF 4

6

5

OPEN-DRAIN

LOW-BATTERY OUTPUT

LBI

8 IN

OUT 2

5V/100mA

MAX667 LBO 7

150µF

150

µF

DD 1

620k

1M

SET 6

GND SHDN

45

220k

NOTE: ALL 150µF CAPACITORS ARE MAXC001, AVAILABLE FROM MAXIM.

Figure 6. MAX660 generates a +5V regulated output from a 3V

lithium battery and operates for 16 hours with a 40mA load.

D2

VOUT = (2VIN) -

C3

C4 (VFD1) - (VFD2)

Figure 5. Combined Positive Multiplier and Negative Converter

_______________________________________________________________________________________ 9

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