Rainbow-electronics MAX684 User Manual download pdf (Page 9)

MAX682/MAX683/MAX684

3.3V-Input to Regulated 5V-Output

Charge Pumps

_______________________________________________________________________________________ 9

Power Dissipation

The power dissipated in the MAX682/MAX683/MAX684

depends on output current and is accurately described

by:

DISS

= I

OUT

(2V

- V

OUT

)

DISS

must be less than that allowed by the package

rating. See the

Absolute Maximum Ratings

for 8-pin

µMAX (MAX683/MAX684) and SO (MAX682) power-

dissipation limits and deratings.

Layout Considerations

All capacitors should be soldered in close proximity to

the IC. Connect ground and power ground through a

short, low-impedance trace. If a high-value resistor is

driving the shutdown input and is picking up noise (i.e.,

frequency jitter at CXP and CXN), bypass SHDN to

GND with a small capacitor (0.01µF).

Paralleling Devices

The MAX682/MAX683/MAX684 can be paralleled to

yield higher load currents. The circuit of Figure 6 can

deliver 500mA at 5V. It uses two MAX682s in parallel.

The devices can share the output capacitors, but each

one requires its own transfer capacitor (C

) and input

capacitor. For best performance, the paralleled devices

should operate in the same mode (skip or constant fre-

quency).

Chip Information

TRANSISTOR COUNT: 659

SUBSTRATE CONNECTED TO GND

Package Information

8LUMAXD.EPS

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

MAX682/MAX683/MAX684 1
Charge Pumps 1

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Rainbow-electronics MAX684 User Manual Page 9

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