MIC5233 datasheet(10/24 Pages) MICROCHIP

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MIC5233

DS20006033E-page 10

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Total power dissipation is calculated using the following

equation:

EQUATION 4-4:

Due to the potential for input voltages up to 36V, ground

current must be taken into consideration.

If we know the maximum load current, we can solve for

the maximum input voltage using the maximum power

dissipation calculated for a +50°C ambient, 319 mW.

EQUATION 4-5:

Ground pin current is estimated using the typical

characteristics of the device.

EQUATION 4-6:

For higher current outputs, only a lower input voltage

will work for higher ambient temperatures.

Assuming a lower output current of 10 mA, the

maximum input voltage can be recalculated:

EQUATION 4-7:

Maximum input voltage for a 10 mA load current at

50°C ambient temperature is 34.55V, utilizing virtually

the entire operating voltage range of the device.

4.6

Adjustable Regulator Application

The MIC5233M5 can be adjusted from 1.24V to 20V by

using two external resistors (Figure 4-1). The resistors

set the output voltage based on the following equation:

EQUATION 4-8:

Feedback resistor R2 should be no larger than 300 kΩ.

FIGURE 4-1:

Adjustable Voltage

Application.

VIN VOUT

–

I

OUT

VIN

IGND



PDMAX



VIN VOUT

–

I

OUT

VIN

IGND



319mW

VIN 3V

–

100mA V

+2.8mA



619mW

VIN 102.8mA



Where:

VIN =6.02V

319mW

VIN 3V

–

10mA V

+0.1mA



349mW

VIN 10.1mA



Where:

VIN = 34.55V

VOUT

VREF 1

-------









Where

VREF = 1.24V

OUT

ADJ

VIN

2.2 μF

1.0 μF

VOUT

GND

MIC5233YM5

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