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MIC5268

150mA µCap CMOS LDO Regulator w/Power Good

Micrel 

Micrel, Inc.

The junction-to-ambient thermal resistance for the

minimum footprint is 235°C/W, from Table 1. The

maximum power dissipation must not be exceeded for

proper operation. Using the output voltage of 1.2V and

an output current of 150mA, the maximum input voltage

can be determined. Because this device is CMOS and

the ground current is typically 100µA over the load

range, the power dissipation contributed by the ground

current is < 1% and can be ignored for this calculation.

315mW = (VIN – 1.2V) 150mA

315mW = VIN·150mA – 195mW

510mW = VIN·150mA

VIN (max) = 3.4V

MIC5268

Therefore, a 1.2V application at 150mA of output current

can accept a maximum input voltage of 3.4V in a SOT-

23-5 package. For a full discussion of heat sinking and

thermal effects on voltage regulators, refer to the

Regulator Thermals section of Micrel’s Designing with

Low-Dropout Voltage Regulators handbook.

Dual-Supply Operation

When used in dual supply systems where the regulator

load is returned to a negative supply, the output voltage

must be diode clamped to ground.

September 2006

7

M9999-091506

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