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LTM8003

8003fc

For more information www.linear.com/LTM8003

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 CFF, CIN, COUT, RFB and RT

values.

3. Apply the CFF (from VOUT to FB) as required.

4. Connect BIAS as indicated.

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,

APPLICATIONS INFORMATION

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

magnitude and polarity and other factors. Please refer to

the graphs in the Typical Performance Characteristics

section for guidance.

The maximum frequency (and attendant RT value) at

which the LTM8003 should be allowed to switch is given

in Table 1 in the Maximum fSW column, while the recom-

mended frequency (and RT value) for optimal efficiency

over the given input condition is given in the fSW column.

There are additional conditions that must be satisfied if

the synchronization function is used. Please refer to the

Synchronization section for details.

Table 1. Recommended Component Values and Configuration (TA = 25°C)

VIN

VOUT

(V)

RFB

(k)

CIN2

COUT

CFF

(pF)

BIAS

(V)

fSW

(k)

Maximum

fSW

Minimum RT

(k)

3.4V to 40V

0.97 Open 4.7µF 50V 1206 X5R 2x 100µF 6.3V 1210 X5R

450kHz

97.6

675kHz

63.4

3.4V to 40V

1.2

402 4.7µF 50V 1206 X5R 2x 100µF 6.3V 1210 X5R

550kHz

78.7

850kHz

49.9

3.4V to 40V

1.5

174 4.7µF 50V 1206 X5R 100µF 6.3V 1210 X5R

600kHz

71.5

1.1MHz

36.5

3.4V to 40V

1.8

115 4.7µF 50V 1206 X5R 100µF 6.3V 1210 X5R

600kHz

71.5

1.3MHz

30.9

3.4V to 40V

2.0

90.9 4.7µF 50V 1206 X5R 100µF 0805 4V X5R

650kHz

64.9

1.4MHz

28.0

4V to 40V1

2.5

63.4 4.7µF 50V 1206 X5R 100µF 0805 4V X5R

750kHz

56.2

1.8MHz

20.5

5V to 40V1

3.3

41.2 4.7µF 50V 1206 X5R 100µF 0805 4V X5R

850kHz

48.7

2.3MHz

14.7

7V to 40V1

24.3 4.7µF 50V 1206 X5R 47µF 6.3V 0805 X5R

1MHz

40.2

3MHz

10.7

11V to 40V1

13.7 4.7µF 50V 1206 X5R 22µF 1206 10V X7R

1.2MHz

33.2

3MHz

10.7

16V to 40V1

8.66 4.7µF 50V 1206 X5R 10µF 0805 16V X7S

1.5MHz

25.5

3MHz

10.7

19.5 to 40V1

6.81 4.7µF 50V 1206 X5R 10µF 0805 16V X7S

1.5MHz

25.5

3MHz

10.7

23.5V to 40V1

5.62 4.7µF 50V 1206 X5R 10µF 1206 25V X5R

1.5MHz

25.5

3MHz

10.7

5V to 22V1

–18

5.62 4.7µF 50V 1206 X5R 10µF 1206 25V X5R

LTM8003 GND 1.5MHz

25.5

3MHz

10.7

4.5V to 25V1

–15

6.81 4.7µF 50V 1206 X5R 10µF 0805 16V X7S

LTM8003 GND 1.5MHz

25.5

3MHz

10.7

3.4V to 28V1

–12

8.66 4.7µF 50V 1206 X5R 10µF 0805 16V X7S

LTM8003 GND 1.5MHz

25.5

3MHz

10.7

3.4V to 32V1

–8

13.7 4.7µF 50V 1206 X5R 22µF 1206 10V X7R

LTM8003 GND 1.2MHz

33.2

3MHz

10.7

3.4V to 351

–5

24.3 4.7µF 50V 1206 X5R 47µF 6.3V 0805 X5R

LTM8003 GND

1MHz

40.2

3MHz

10.7

3.4V to 36V1

–3.3

41.2 4.7µF 50V 1206 X5R 100µF 0805 4V X5R

LTM8003 GND 850kHz

48.7

2.3MHz

14.7

1. The LTM8003 may be capable of lower input voltages but may skip switching cycles.

2. An input bulk capacitor is required

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