Rainbow-electronics MAX864 Manual do Utilizador descarregar pdf (Página 5)

MAX864

Dual-Output Charge Pump with Shutdown

_______________________________________________________________________________________ 5

____________________________Typical Operating Characteristics (continued)

= 5.0V, capacitor values in Table 1, T

= +25°C, unless otherwise noted.)

TIME TO EXIT SHUTDOWN

+5V

+10V

-10V

MAX864-19

1ms/div

FC0 = FC1 = IN (185kHz), C1–C4 = 1µF

FC0 = FC1 = GND (7kHz), C1–C4 = 33µF

_____________________Pin Description

No Connect—no internal connection.

Connect these to ground to improve

thermal dissipation.

N.C.

9, 10,

13, 14

Positive Power-Supply Input IN12

Output of the Boost Charge PumpV+15

Positive Terminal of the Flying Boost

Capacitor

C1+16

Output of the Inverting Charge PumpV-5

Active-Low Shutdown Input. With

SHDN low, the part is in shutdown

mode and its supply current is less

than 1µA. In shutdown mode, V+

connects to IN through a 22Ω switch,

and V- connects to GND through a

6Ω switch.

SHDN

Frequency Select, MSB (see Table 1)FC17

Frequency Select, LSB (see Table 1)FC08

Negative Terminal of the Flying

Inverting Capacitor

C2-4

Ground (connect pins 3 and 11 together)GND3, 11

Positive Terminal of the Flying

Inverting Capacitor

C2+2

Negative Terminal of the Flying Boost

Capacitor

C1-

FUNCTIONNAME

MAX864

C1+

C1-

+5V

C2+

C2-

GND

V-

SHDN

FC0

FC1

V+ OUT

V- OUT

SEE TABLE 1 FOR CAPACITOR VALUES.

L-

L+

V+

N.C.

GND

N.C.

L-

Figure 1. Test Circuit

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

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