MIC5316-F5CYMT datasheet(11/14 Pages) MICREL

Part #	MIC5316-F5CYMT

Description	Low Voltage Dual 300mA LDO with Power on Reset and Voltage Select

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Manufacturer	MICREL [Micrel Semiconductor]

Direct Link	http://www.micrel.com

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11 / 14 page

Micrel, Inc.

MIC5316

July 2008

11

M9999-070208-A

Thermal Considerations

The MIC5316 is designed to provide 300mA of

continuous current for both outputs in a very small

package. Maximum ambient operating temperature can

be calculated based upon the output current and the

voltage drop across the part. Given that the input voltage

is 1.8V, the output voltage is 1.5V for VOUT1, 1.0V for

VOUT2 and the output current = 300mA for each output.

The actual power dissipation of the regulator circuit can

be determined using the equation:

PD = (VIN – VOUT1) IOUT1 + (VIN – VOUT2) I OUT2 + VBIAS IGND

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.

PD = (1.8V – 1.5V) × 300mA + (1.8V – 1.0V) × 300mA

PD = 0.33W

To

determine

the

maximum

ambient

operating

temperature of the package, use the junction-to-ambient

thermal resistance of the device and the following basic

equation:

⎟

⎠

⎞

⎜

⎝

⎛

−

=

JA

A

J(MAX)

D(MAX)

θ

T

P

TJ(max) = 125°C, the maximum junction temperature of

the die. The junction-to-ambient thermal resistance for

the minimum footprint, is θJA = 70°C/W.

Substituting PD for PD(max) and solving for the ambient

operating temperature will give the maximum operating

conditions for the regulator circuit.

The maximum power dissipation must not be exceeded

for proper operation.

For example, when operating the MIC5316-F5CYMT at

an input voltage of 1.8V and 300mA, loads at each

output with a minimum footprint layout, the maximum

ambient operating temperature TA can be determined as

follows:

0.33W = (125°C – TA)/(70°C/W)

TA = 101.9°C

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. This information can be found on

Micrel's website at:

http://www.micrel.com/_PDF/other/LDOBk_ds.pdf

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MIC5316-F5CYMT Datasheet(PDF) 11 Page - Micrel Semiconductor

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