RT7247B datasheet(13/15 Pages) RICHTEK

Part #	RT7247B

Description	2A, 18V, 1.2MHz Synchronous Step-Down Converter

PDF	15 Pages

Scroll/Zoom	100%

Manufacturer	RICHTEK [Richtek Technology Corporation]

Direct Link	http://www.richtek.com

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13 / 15 page

RT7247B

DS7247B-01

September 2012

www.richtek.com

is a registered trademark of Richtek Technology Corporation.

Figure 8. Derating Curve of Maximum Power Dissipation

(a) Copper Area = (2.3 x 2.3) mm2,

θJA = 75°C/W

(b) Copper Area = 10mm2,

θJA = 64°C/W

2 ,

θJA = 54°C/W

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

2.0

2.2

100

125

Ambient Temperature (°C)

Copper Area

70mm

50mm

30mm

10mm

Min.Layout

Four-Layer PCB

The maximum power dissipation depends on the operating

ambient temperature for fixed TJ(MAX) and thermal

resistance,

θJA. The derating curve in Figure 8 of derating

curves allows the designer to see the effect of rising

ambient temperature on the maximum power dissipation

allowed.

(d) Copper Area = 50mm2 ,

θJA = 51°C/W

(e) Copper Area = 70mm

2 ,

θJA = 49°C/W

Figure 7. Thermal Resistance vs. Copper Area Layout

Design

RT7247B Datasheet(PDF) 13 Page - Richtek Technology Corporation

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