LTM8027

16

8027f

The junction-to-air and junction-to-board thermal resis-

tances given in the Pin Configuration diagram may also

be used to estimate the LTM8027 internal temperature.

These thermal coefficients are determined per JESD 51-9

(JEDEC standard, test boards for area array surface mount

package thermal measurements) through analysis and

physical correlation. Bear in mind that the actual thermal

resistance of the LTM8027 to the printed circuit board

depends upon the design of the circuit board.

APPLICATIONS INFORMATION

The die temperature of the LTM8027 must be lower than

the maximum rating of 125°C, so care should be taken in

the layout of the circuit to ensure good heat sinking of the

LTM8027. The bulk of the heat flow out of the LTM8027

is through the bottom of the module and the LGA pads

into the printed circuit board. Consequently a poor printed

circuit board design can cause excessive heating, result-

ing in impaired performance or reliability. Please refer to

the PCB Layout section for printed circuit board design

suggestions.

Table 2. Recommended Component Values and Configuration

(V)

(V)

BIAS1/BIAS2

(kΩ)

(kHz)

(kΩ)

(kHz)

(kΩ)

4.5 to 60

3.3

2

× 4.7μF 2220 100V 5 × 100μF 1812 6.3V

8.5V to 15V

301

115

154

160

107

7.5 to 60

5

2

× 4.7μF 2220 100V 4 × 100μF 1210 6.3V

8.5V to 15V

162

210

75.0

230

68.2

10.5 to 60

8

2

× 4.7μF 2220 100V 4 × 47μF 1210 10V

8.5V to 15V

90.9

260

59.0

350

40.2

16 to 60

12

2

× 4.7μF 2220 100V 4 × 22μF 1210 16V

AUX

56.2

300

48.7

500

23.7

20.5 to 60

15

2

× 4.7μF 2220 100V 4 × 22μF 1210 16V

AUX

44.2

350

40.2

500

23.7

26 to 60

18

2

× 4.7μF 2220 100V 4 × 10μF 1812 25V

8.5V to 15V

36.5

400

31.6

500

23.7

34 to 60

24

2

× 4.7μF 2220 100V 4 × 10μF 1812 25V

8.5V to 15V

26.7

430

28.7

500

23.7

4.5 to 40

2.5

2

× 10μF 2220 50V 5 × 100μF 1812 6.3V

8.5V to 15V

487

145

124

185

88.7

4.5 to 40

3.3

2

× 10μF 2220 50V 4 × 100μF 1812 6.3V

8.5V to 15V

301

165

102

240

64.9

7.5 to 40

5

2

× 10μF 2220 50V 4 × 100μF 1210 6.3V

8.5V to 15V

162

210

75.0

315

45.3

10.5 to 40

8

2

× 10μF 2220 50V

4

× 47μF 1210 10V

8.5V to 15V

90.9

260

59.0

500

23.7

16 to 40

12

2

× 10μF 2220 50V

4

× 22μF 1210 16V

AUX

56.2

300

48.7

500

23.7

20.5 to 40

15

1

× 10μF 2220 50V

4

× 22μF 1210 16V

AUX

44.2

350

40.2

500

23.7

26 to 40

18

1

× 10μF 2220 50V

4

× 10μF 1812 25V

8.5V to 15V

36.5

400

31.6

500

23.7

34 to 40

24

1

× 10μF 2220 50V

4

× 10μF 1812 25V

8.5V to 15V

26.7

430

28.7

500

23.7

4.5 to 56

–3.3

2

× 4.7μF 2220 100V 5 × 100μF 1812 6.3V 8.5V to 15V Above Output

301

115

154

155

115

4.5 to 55

–5

2

× 4.7μF 2220 100V 4 × 100μF 1210 6.3V 8.5V to 15V Above Output

162

190

90.9

230

68.2

10.5 to 52

–8

2

× 4.7μF 2220 100V 4 × 47μF 1210 10V 8.5V to 15V Above Output

90.9

260

59.0

350

40.2

16 to 48

–12

2

× 4.7μF 2220 100V 4 × 22μF 1210 16V

AUX

56.2

300

48.7

500

23.7