MIC5249-2.85YMM datasheet(6/7 Pages) MICREL

Part #	MIC5249-2.85YMM

Description	300mA 關Cap LDO with Programmable Power-On Reset Delay

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Manufacturer	MICREL [Micrel Semiconductor]

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Micrel, Inc.

MIC5249

March 2012

6

M9999-030812

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

conditions that are critical to the application will give the

maximum operating conditions for the regulator circuit.

For example, when operating the MIC5249-3.0YMM at

50°C with a minimum footprint layout, the maximum

input voltage for a set output current can be determined

as follows:

Thermal Considerations

The MIC5249 is designed to provide 300mA of

continuous current in a very small package. Maximum

power dissipation can be calculated based on the output

current and the voltage drop across the device. To

determine the maximum power dissipation of the

package, use the junction-to-ambient thermal resistance

of the device and the following basic equation:

⎟

⎠

⎞

⎜

⎝

⎛

°

−

°

=

C/W

160

C

50

C

125

P

D(max)

⎟

⎠

⎞

⎜

⎝

⎛

−

=

JA

A

J(max)

D(max)

θ

T

P

The junction-to-ambient thermal resistance for the

minimum footprint is 160°C/W, from Table 1. The

maximum power dissipation must not be exceeded for

proper operation. Using the output voltage of 3.0V, and

an output current of 300mA, the maximum input voltage

can be determined. Because this device is CMOS and

the ground current is typically 90µA over the load range,

the power dissipation contributed by the ground current

is < 1.0% and can be ignored for this calculation:

TJ(max) is the maximum junction temperature of the die,

125°C and TA is the ambient operating temperature. θJA

is layout dependent; Table 1 shows examples of the

junction-to-ambient thermal resistance for the MIC5249.

Package

θ

JA Recommended Minimum Footprint

MSOP-8

160°C/W

468mW = (VIN – 3.0V) 300mA

Table 1. MSOP-8 Thermal Resistance

468mW = VIN × 300mA – 900mW

1368mW = VIN × 300mA

VIN(max) = 4.56V

The actual power dissipation of the regulator circuit can

be determined using the equation:

Therefore, a 3.0V application at 300mA of output current

can accept a maximum input voltage of 4.56V in the

MSOP-8 package. For a full discussion of heat sinking

and thermal effects on the voltage regulators, refer to the

“Regulator Thermals” section of Micrel’s Designing with

Low-Dropout Voltage Regulators Handbook

.

PD = (VIN – VOUT ) IOUT + VIN IGND

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MIC5249-2.85YMM Datasheet(PDF) 6 Page - Micrel Semiconductor

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