LT3020 datasheet(11/16 Pages) LINER

Part #	LT3020

Description	1.1A, Low Noise, Low Dropout Linear Regulator

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Manufacturer	LINER [Linear Technology]

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LT1965

11

1965f

APPLICATIONS INFORMATION

The following tables list thermal resistance for several

different board sizes and copper areas. All measurements

were taken in still air on 1/16" FR-4 board with one ounce

copper.

Table 1. Measured Thermal Resistance for DFN Package

Copper Area

Thermal Resistance

Topside*

Backside

Board Area

(Junction-to-Ambient)

2500mm2

60°C/W

1000mm2

2500mm2

62°C/W

225mm2

2500mm2

65°C/W

100mm2

2500mm2

68°C/W

50mm2

2500mm2

70°C/W

*Device is mounted on topside

Table 2. Measured Thermal Resistance for MSOP Package

Copper Area

Thermal Resistance

Topside*

Backside

Board Area

(Junction-to-Ambient)

2500mm2

55°C/W

1000mm2

2500mm2

57°C/W

225mm2

2500mm2

60°C/W

100mm2

2500mm2

65°C/W

50mm2

2500mm2

68°C/W

*Device is mounted on topside

Table 3. Measured Thermal Resistance for DD-PAK Package

Copper Area

Thermal Resistance

Topside*

Backside

Board Area

(Junction-to-Ambient)

2500mm2

25°C/W

1000mm2

2500mm2

30°C/W

125mm2

2500mm2

35°C/W

*Device is mounted on topside

Measured Thermal Resistance for TO-220 Package

Thermal Resistance (Junction-to-Case) = 3°C/W

Calculating Junction Temperature

Example: Given an output voltage of 2.5V, an input voltage

range of 3.3V ± 5%, an output current range of 0mA to

500mA and a maximum ambient temperature of 85°C,

what will the maximum junction temperature be?

The power dissipated by the device equals:

IOUT(MAX) • (VIN(MAX) – VOUT) + IGND • VIN(MAX)

where:

IOUT(MAX) = 500mA

VIN(MAX) = 3.465V

IGND at (IOUT = 500mA, VIN = 3.465V) = 8.2mA

So,

P = 500mA(3.465V – 2.5V) + 8.2mA(3.465V) = 0.511W

Using a DFN package, the thermal resistance will be in

the range of 60°C/W to 70°C/W depending on the cop-

per area. So the junction temperature rise above ambient

approximately equals:

0.511W • 65°C/W = 33.22°C

The maximum junction temperature equals the maximum

ambient temperature plus the maximum junction tempera-

ture rise above ambient or:

TJMAX = 85°C + 33.22°C = 118.22°C

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