MIC5216-3.0BM5 Просмотр технического описания (PDF) - Micrel

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MIC5216-3.0BM5

500mA-Peak Output LDO Regulator

Micrel 

MIC5216

The total power dissipation of the device under these condi-

tions is the sum of the two power dissipation figures.

PD(total) = PD × 50mA + PD × 500mA

PD(total) = 151mW + 119mW

PD(total) = 270mW

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

VIN

IN

OUT

EN FLG

GND

100k

Micrel

VOUT

1µF

Figure 5. Low-Noise Fixed Voltage Regulator

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

lator circuit. A 1µF 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.

January 2000

9

MIC5216

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