MIC22600_09 datasheet(17/29 Pages) MICREL

Part #	MIC22600

Description	1MHz, 6A Integrated Switch Synchronous Buck Regulator

PDF	29 Pages

Scroll/Zoom	100%

Manufacturer	MICREL [Micrel Semiconductor]

Direct Link	http://www.micrel.com

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17 / 29 page

Micrel, Inc.

MIC22600

October 2009

M9999-102809-C

•

RθJA is a combination of junction to case thermal

resistance (RθJC) and Case-to-Ambient thermal

resistance (RθCA), since thermal resistance of

the solder connection from the ePAD to the PCB

is negligible; RθCA is the thermal resistance of

the ground plane to ambient, so RθJA = RθJC +

RθCA.

•

TAMB is the Operating Ambient temperature.

Example:

The Evaluation board has 2 copper planes contributing

to an RθJA of approximately 25°C/W. The worst case

RθJC of the MLF 4x4 is 14

oC/W.

JA = RθJC + RθCA

JA = 14 + 25 = 39

oC/W

To calculate the junction temperature for a 50°C

ambient:

TJ = TAMB+PDISS . RθJA

TJ = 50 + (1.5 x 39)

TJ = 109°C

This is below the maximum of 125°C.

VIN

VOUT

@6A

3.5

4.5

1.47

1.50

1.52

1.54

1.56

1.2

1.45

1.47

1.49

1.51

1.54

1.8

1.46

1.45

1.47

1.48

2.5

1.61

1.53

1.49

1.47

3.3

–

1.70

1.62

1.56

1.53

Table 2. Power Dissipation (W) for 6A output

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