MAX864C View Datasheet(PDF) - Maxim Integrated

Part Name

Description

Manufacturer

MAX864C

Dual-Output Charge Pump with Shutdown

Maxim Integrated 

Dual-Output Charge Pump with Shutdown

__________Applications Information

Positive and Negative Converter

The most common application of the MAX864 is as a

dual charge-pump voltage converter that provides pos-

itive and negative outputs of two times a positive input

voltage for biasing analog circuitry (Figure 3). Select a

charge-pump frequency high enough so it does not

interfere with other circuitry, but low enough to maintain

low supply current. See Table 1 for the correct device

configuration.

Paralleling Devices

Paralleling multiple MAX864s reduces the output resis-

tance of both the positive and negative converters

(Figure 4). The effective output resistance is the output

resistance of one device divided by the total number of

devices. Separate C1 and C2 charge-pump capacitors

are required for each MAX864, but the reservoir capac-

itors C3 and C4 can be shared.

VIN

(+1.75V TO +6.0V)

C1

C2

IN

SEE TABLE 1

1 C1- MAX864 C1+ 16

2 C2+

3

GND

V+ 15

N.C. 14

4 C2-

N.C. 13

5 V-

6 SHDN

7 FC1

IN 12

GND 11

N.C. 10

8 FC0

N.C. 9

Figure 3. Positive and Negative Converter

+2 x VIN

C3

C4

-2 x VIN

8 _______________________________________________________________________________________

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