LTM8021 datasheet(15/28 Pages) LINER

15 / 28 page

LTM8053

8053fc

For more information www.linear.com/LTM8053

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.

3. Apply the CFF (from AUX to FB) or CSHARE (from SHARE

to GND) capacitors as required.

4. Connect BIAS as indicated.

Whilethesecomponentcombinationshavebeentestedfor

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 temperature, the

relationship between the input and output voltage mag-

nitude 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 LTM8053 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

RFB

CIN2

COUT

CFF

CSHARE

BIAS

fSW

MAX fSW MINRT

3.4V to 40V

0.97V

Open

4.7µF 50V 1206 X5R 2x 100µF 4V 0805 X5R 47pF

450kHz 100k 675kHz 63.4k

3.4V to 40V

1.2V

1.05M 4.7µF 50V 1206 X5R 2x 100µF 4V 0805 X5R 47pF

550kHz 78.7k 850kHz 49.9k

3.4V to 40V

1.5V

464k

4.7µF 50V 1206 X5R 100µF 4V 0805 X5R

27pF

600kHz 71.5k 1.1MHz 36.5k

3.4V to 40V

1.8V

294k

4.7µF 50V 1206 X5R 100µF 4V 0805 X5R

10pF

600kHz 71.5k 1.3MHz 30.9k

3.4V to 40V

237k

4.7µF 50V 1206 X5R 100µF 4V 0805 X5R

650kHz 64.9k 1.4MHz

28k

4V to 40V1

2.5V

158k

4.7µF 50V 1206 X5R 100µF 4V 0805 X5R

750kHz 56.2k 1.8MHz 20.5k

5V to 40V1

3.3V

102k

4.7µF 50V 1206 X5R 100µF 4V 0805 X5R

850kHz 48.7k 2.3MHz 14.7k

7V to 40V1

60.4k

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

1MHz

40.2k

3MHz

10.7k

11V to 40V1

34k

4.7µF 50V 1206 X5R 47µF 10V 1210 X7R

1.2MHz 33.2k

3MHz

10.7k

16V to 40V1

12V

21.5k

4.7µF 50V 1206 X5R 22µF 16V 1210 X5S

1.5MHz 25.5k

3MHz

10.7k

19.5V to 40V1

15V

16.9k

4.7µF 50V 1206 X5R 22µF 16V 1210 X5S

47pF

1.5MHz 25.5k

3MHz

10.7k

4.5V to 25V1

–15V

16.9k

4.7µF 50V 1206 X5R 22µF 16V 1210 X5S

47pF

LTM8053 GND 1.5MHz 25.5k

3MHz

10.7k

3.4V to 28V1

–12V

21.5k

4.7µF 50V 1206 X5R 22µF 16V 1210 X5S

LTM8053 GND 1.5MHz 25.5k

3MHz

10.7k

3.4V to 32V1

–8V

34k

4.7µF 50V 1206 X5R 47µF 10V 1210 X7R

LTM8053 GND 1.2MHz 33.2k

3MHz

10.7k

3.4V to 35V1

–5V

60.4k

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

LTM8053 GND

1MHz

40.2k

3MHz

10.7k

3.4V to 36V1

–3.3

102k

4.7µF 50V 1206 X5R 100µF 4V 0805 X5R

LTM8053 GND 850kHz 48.7k 2.3MHz 14.7k

Note 1: The LTM8053 may be capable of lower input voltages but may skip switching cycles.

Note 2: An input bulk capacitor is required.

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