Rainbow-electronics MAX861 Manual do Utilizador descarregar pdf (Página 9)

MAX860/MAX861

50mA, Frequency-Selectable,

Switched-Capacitor Voltage Converters

_______________________________________________________________________________________ 9

Compatibility with

MAX660/MAX665/ICL7660

The MAX860/MAX861 can be used in sockets

designed for the MAX660, MAX665, and ICL7660 with

a minimum of one wiring change. This section gives

advice on installing a MAX860/MAX861 into a socket

designed for one of the earlier devices.

The MAX660, MAX665, and ICL7660 have an OSC pin

instead of

–

—

–

. MAX660, MAX665, and ICL7660 nor-

mal operation is with OSC floating (although OSC can

be overdriven). If OSC is floating, pin 7 (

–

—

–

) should

be jumpered to V

to enable the MAX860/MAX861

permanently. Do not leave

–

—

–

on the MAX860/

MAX861 floating.

The MAX860/MAX861 operate with FC either floating or

connected to V

, OUT, or GND; each connection

defines the oscillator frequency. Thus, any of the nor-

mal MAX660, MAX665, or ICL7660 connections to pin 1

will work with the MAX860/MAX861, without modifica-

tions. Changes to the FC connection are only required

if you want to adjust the operating frequency.

MAX860

MAX861

OUT

= (2V

) -

FD1

) - (V

FD2

)



OUT

= -V

D1, D2 = 1N4148

Figure 3. Combined Doubler and Inverter

PART

NUMBER

OUTPUT

CURRENT

(mA)

OUTPUT

RESISTANCE

(Ω)

SWITCHING

FREQUENCY

(kHz)

MAX660 100 6.5 5/40

MAX665 100 6.5 5/40

MAX860 50 12 6/50/130

MAX861 50 12 13/100/250

ICL7660 10 55 5

Table 5. Product Selection Guide

TRANSISTOR COUNT: 101

SUBSTRATE CONNECTED TO V

SHDN

OUT

C1+

GND

C1-

0.084"

(2.13mm)

0.058"

(1.47mm)

___________________Chip Topography

1 2 3 4 5 6 7 8 9 10 11 12

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