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LT3467/LT3467A

3467afe

APPLICATIONS INFORMATION

VOUT

200mV/DIV

AC COUPLED

IL1

5A/DIV

AC COUPLED

LOAD CURRENT

100mA/DIV

AC COUPLED

20μs/DIV

3467 F03

Figure 3. Transient Response of Figure 8’s Step-Up

Converter without Phase Lead Capacitor

VOUT

200mV/DIV

AC COUPLED

IL1

5A/DIV

AC COUPLED

LOAD CURRENT

100mA/DIV

AC COUPLED

20μs/DIV

3467 F04

Figure 4. Transient Response of Figure 8’s Step-Up

Converter with a 22pF Phase Lead Capacitor

Setting Output Voltage

To set the output voltage, select the values of R1 and R2

(see Figure 2) according to the following equation.

=R2

VOUT

1.255V

–1

⎛

⎝⎜

⎞

⎠⎟

A good value for R2 is 13.3k which sets the current in the

resistor divider chain to 1.255V/13.3k = 94μA.

Layout Hints

The high speed operation of the LT3467/LT3467A demands

careful attention to board layout. You will not get adver-

tised performance with careless layout. Figure 5a shows

the recommended component placement for the ThinSOT

package. Figure 5b shows the recommended component

placement for the DFN package. Note the vias under the

Exposed Pad. These should connect to a local ground

plane for better thermal performance.

GND

VOUT

VIN

SHDN

3467 F05a

CSS

Figure 5a. Suggested Layout—ThinSOT

GND

VOUT

3467 F05b

CSS

VIN

SHDN

Figure 5b. Suggested Layout—DFN

LT3467 Datasheet(PDF) 9 Page - Linear Technology

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