3.3V-Input to Regulated 5V-Output

Charge Pumps

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9

Power Dissipation

The power dissipated in the MAX682/MAX683/MAX684

depends on output current and is accurately described

by:

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

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