LTM8048 datasheet(12/22 Pages) LINER

12 / 22 page

LTM8045

8045fa

For more information www.linear.com/8045

APPLICATIONS INFORMATION

For most applications, the design process is straight

forward, summarized as follows:

1. Look at Table 1 and find the row that has the desired

input range and output voltage.

2. Apply the recommended CIN, COUT, RFB and RT values.

While these component combinations have been tested

for proper operation, it is incumbent upon the user to

verify proper operation over the intended system’s line,

load and environmental conditions. Bear in mind that the

maximum output current is limited by junction tempera-

ture, the relationship between the input and output voltage

magnitudes, polarity and other factors. Please refer to the

graphs in the Typical Performance Characteristics section

for guidance.

Themaximumfrequency(andattendantRTvalue)atwhich

the LTM8045 should be allowed to switch is given in

Table 1 in the fMAX column, while the recommended fre-

quency (and RTvalue)foroptimalefficiencyoverthegiven

input condition is given in the fOPTIMAL column.

Table 1. Recommended Component Values and Configuration

(TA = 25°C. See the Typical Performance Characteristics for Load Conditions)

SEPIC Topology

VIN (V)

VOUT (V)

CIN

COUT

RADJ (k)

fOPTIMAL

RT(OPTIMAL) (k)

fMAX (MHz)

RT(MIN) (k)

2.8 to 18

2.5

4.7µF, 25V, 1206

100µF, 6.3V, 1210

15.4

600kHz

154

1.3

69.8

2.8 to 18

3.3

4.7µF, 25V, 1206

100µF, 6.3V, 1210

24.9

700kHz

130

1.5

60.4

2.8 to 18

4.7µF, 25V, 1206

100µF, 6.3V, 1210

45.3

800kHz

115

45.3

2.8 to 18

4.7µF, 25V, 1206

47µF, 10V, 1210

80.6

1MHz

90.9

45.3

2.8 to 18

4.7µF, 25V, 1206

22µF, 16V, 1210

130

1.2MHz

75.0

45.3

4.5 to 18

4.7µF, 25V, 1206

22µF, 25V, 1210

165

1.5MHz

60.4

45.3

Inverting Topology

VIN (V)

VOUT (V)

CIN

COUT

RADJ (k)

fOPTIMAL

RT(OPTIMAL) (k)

fMAX (MHz)

RT(MIN) (k)

2.8 to 18

–2.5

4.7µF, 25V, 0805

47µF, 6.3V, 1206

30.1

600kHz

154

1.3

69.8

2.8 to 18

–3.3

4.7µF, 25V, 0805

47µF, 6.3V, 1206

39.2

650kHz

140

1.5

60.4

2.8 to 18

–5

4.7µF, 25V, 0805

22µF, 6.3V, 1206

60.4

700kHz

130

45.3

2.8 to 18

–8

4.7µF, 25V, 1206

22µF, 10V, 1206

95.3

1MHz

90.9

45.3

2.8 to 18

–12

4.7µF, 25V, 1206

10µF, 16V, 1206

143

1.2MHz

75.0

45.3

4.5 to 18

–15

4.7µF, 25V, 1206

178

1.5MHz

60.4

45.3

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