January 2000

9

MIC5216

MIC5216

Micrel

The total power dissipation of the device under these condi-

tions is the sum of the two power dissipation figures.

P

P

P

The total power dissipation of the regulator is less than the

maximum power dissipation of the SOT-23-5 package at

room temperature, on a minimum footprint board and there-

fore would operate properly.

Multilayer boards with a ground plane, wide traces near the

pads, and large supply-bus lines will have better thermal

conductivity.

For additional heat sink characteristics, please refer to Micrel

Application Hint 17, “Designing P.C. Board Heat Sinks”,

included in Micrel’s

Databook. For a full discussion of heat

sinking and thermal effects on voltage regulators, refer to

Regulator Thermals section of Micrel’s

Designing with Low-

Dropout Voltage Regulators handbook.

Fixed Regulator Circuits

MIC5216

IN

OUT

GND

1µF

EN

FLG

100k

Figure 5. Low-Noise Fixed Voltage Regulator

Figure 5 shows a basic MIC5216-x.xBMx fixed-voltage regu-

lator circuit. A 1

µF minimum output capacitor is required for

basic fixed-voltage applications.

The flag output is an open-collector output and requires a

pull-up resistor to the input voltage. The flag indicates an

undervoltage condition on the output of the device.