LTM4639

24

4639f

For more information www.linear.com/LTM4639

APPLICATIONS INFORMATION

Table 7. Recommended Heat Sinks

HEAT SINK MANUFACTURER

PART NUMBER

WEBSITE

AAVID Thermalloy

375424B00034G

www.aavidthermalloy.com

Cool Innovations

4-050503P to 4-050508P

www.coolinnovations.com

CERAMIC VENDORS

VALUE

PART NUMBER

Murata

220µF, 4V

GRM31CR60G227M

Murata

47µF, 10V

GRM31CR61A476KE15L

LTpowerCAD Can Be Used to Optimize the Control Loop Response. Examples Are Shown Using Ceramic Only for High Performance

Transient Response

(V)

(CERAMIC)

(CER)

(CER &

BULK)

(pF)

(pF)

(k)

(pF)

(pF)

(V)

DROOP

(mV)

PEAK-TO-

PEAK

DEVIATION

(mV)

REC.

TIME

(µs)

LOAD

STEP

(A/µs)

(kΩ)

FREQ (kHz)

TRACK

3.3V,5V,7V

1

22µF × 4

100µF

200µF

× 6

-

68

22

20

1200

100 2.5,

3.3,

5, 7

40

80

24

7.5

90.9

350, 400,

500, 500

1.2

22µF × 4

100µF

200µF

× 6

-

68

22

20

1200

100 2.5,

3.3,

5, 7

43

88

24

7.5

60.4

350, 400,

500, 500

1.5

22µF × 4

100µF

200µF

× 4

-

68

22

20

1200

100 2.5,

3.3,

5, 7

60

122

24

7.5

40.2

350, 400,

500, 500

1.8

22µF × 4

100µF

200µF

× 4

-

68

22

20

1200

100 2.5,

3.3,

5, 7

64

130

28

7.5

30.1

350, 400,

500, 500

2.5

22µF × 4

100µF

47µF

× 2

-

47

22

4

4700

47

3.3,

5, 7

179

320

33

5

19.1

400, 500,

550

3.3

22µF × 4

100µF

47µF

× 2

-

47

22

4

4700

47

5,7

219

400

33

5

13.3

500, 550

5

22µF × 4

100µF

47µF

× 2

-

-

22

4

4700

47

7

250

500

24

5

8.25

550

*

Additional Bulk Capacitance may be required for ≤ 3.3V input

Depends on Source Impedance

Table 6*. Output Voltage Response vs Component Matrix (Refer to Figure 22). Typical Measured Values