LTM4643 datasheet(13/28 Pages) AD

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LTM8060

Rev. 0

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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. Connect BIAS as indicated.

When using the LTM8060 with different output voltages,

the higher frequency recommended by Table 1 will usu-

ally result in the best operation. 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 condi-

tions. Bear in mind that the maximum output current is

limited by junction temperature, the relationship between

the input and output voltage magnitude and other fac-

tors. Please refer to the graphs in the Typical Performance

Characteristics section for guidance.

The maximum frequency (and attendant RT value) at

which the LTM8060 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.

Set Output Voltage

The Output Voltage is programmed with a FB resistor

as shown in the Figure below. Choose the resistor value

according to Equation 1.

RFB =

249k

VOUT

0.8V

−1

(2)

1% resistor is recommended to maintain output voltage

accuracy.

249k

10pF

0.1µF

1.5µH

RFB

CURRENT MODE

CONTROLLER

0.8V

VOUT

8060 F01

Figure 1. Set Output Voltage with a FB Resistor

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