MIC94345-MYCS datasheet(11/16 Pages) MICREL

Part #	MIC94345-MYCS

Description	500mA LDO with Ripple Blocker??Technology

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Manufacturer	MICREL [Micrel Semiconductor]

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Micrel, Inc.

MIC94325/45/55

October 2012

11

M9999-102512-A

PD = (VIN – VOUT1) I OUT + VIN IGND

For more information about Micrel’s Ripple Blocker

products, go to:

Because this device is CMOS and the ground current is

typically <170µA over the load range, the power

dissipation contributed by the ground current is <1% and

can be ignored for this calculation.

http://www.micrel.com/index.php/en/products/power-

management-ics/ldos/linear-power-filters.html

PD = (2.5V – 1.8V) × 500mA

http://www.micrel.com/index.php/en/products/power-

management-ics/ldos/linear-power-filters/article/1-

mic94300.html

PD = 0.35W

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:

http://www.micrel.com/index.php/en/products/power-

management-ics/ldos/linear-power-filters/article/3-

mic94310.html

















JA

A

J(max)

D(MAX)

θ

T

P

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

die, θJA thermal resistance = 160°C/W for the YCS

package and 92°C/W for the Thin DFN package.

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 MIC94325-GYMT at

an input voltage of 2.5V and 500mA load with a

minimum footprint layout, the maximum ambient

operating temperature TA can be determined as follows:

0.35W = (125°C – TA)/(92°C/W)

TA = 92°C

Therefore, the maximum ambient operating temperature

allowed in a 1.6mm x 1.6mm Thin DFN package is 92°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.pdf

http://www.micrel.com/_PDF/other/LDO%20SG.B.pdf

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MIC94345-MYCS Datasheet(PDF) 11 Page - Micrel Semiconductor

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