Rainbow-electronics MAX864 Manual de usuario descargar pdf (Pagina 9)

MAX864

Dual-Output Charge Pump with Shutdown

_______________________________________________________________________________________ 9

Heavy Output Current Loads

When under heavy loads, where V+ is sourcing current

into V- (i.e., load current flows from V+ to V-, rather than

from supply to ground), do not allow the V- supply to

pull above ground. In applications where large currents

flow from V+ to V-, use a Schottky diode (1N5817)

between GND and V-, with the anode connected to

GND (Figure 5).

Layout and Grounding

Good layout is important, primarily for good noise per-

formance. To ensure good layout, mount all compo-

nents as close together as possible, keep traces short

to minimize parasitic inductance and capacitance, and

use a ground plane. Connecting all N.C. pins to a

ground plane improves thermal dissipation.

MAX864

V+

C1-

GND

3.3µF

3.3µF 3.3µF

V+ OUT

V- OUT

C2+

C2-

V-

C1+

GND

MAX864

V+

C1-

C2+

C2-

V-

C1+

GND

Figure 4. Paralleling Two MAX864s

MAX864

GND

V-

Figure 5. High V- Load Circuit

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

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Rainbow-electronics MAX864 Manual de usuario Pagina 9

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