MIC5314-FFYMT datasheet(11/14 Pages) MICREL

Part #	MIC5314-FFYMT

Description	Low Voltage Dual 300mA LDO with Power on Reset

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Manufacturer	MICREL [Micrel Semiconductor]

Direct Link	http://www.micrel.com

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11 / 14 page

Micrel, Inc.

MIC5314

July 2008

11

M9999-070208-A

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 MIC5314-FCYMT 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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MIC5314-FFYMT Datasheet(PDF) 11 Page - Micrel Semiconductor

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