LT3467AIDDB-TRPBF(RevD) Ver la hoja de datos (PDF) - Linear Technology

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componentes Descripción

Fabricante

LT3467AIDDB-TRPBF
(Rev.:RevD)

1.1A Step-Up DC/DC Converter with Integrated Soft-Start

Linear Technology 

LT3467/LT3467A

APPLICATIONS INFORMATION

LOAD CURRENT

100mA/DIV

AC COUPLED

VOUT

200mV/DIV

AC COUPLED

IL1

5A/DIV

AC COUPLED

20μs/DIV

3467 F03

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

Converter without Phase Lead Capacitor

LOAD CURRENT

100mA/DIV

AC COUPLED

VOUT

200mV/DIV

AC COUPLED

IL1

5A/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.

R1=

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.

L1

D1

VOUT

C2

1

2

GND

3

FB

C1

VIN

6

CSS

5 SS

4

SHDN

R2

R1

C3

VOUT 3467 F05a

Figure 5a. Suggested Layout—ThinSOT

GND

C2

VOUT

FB 1

2

3

4

D1

L1

VOUT

C3

R1

R2

8

7

CSS

6

5

C1

SHDN

VIN

3467 F05b

Figure 5b. Suggested Layout—DFN

3467afd

9

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