LBRX datasheet(14/20 Pages) LINER

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LT3466-1

34661f

COUT1

RFB1

CTRL1

CTRL2

34661 F10

COUT2

CIN

VIN

GND

Figure 11. Recommended Component Placement

APPLICATIO S I FOR ATIO

The VCE(SAT) and VBE(SAT) values for the transistor Q1 can

be obtained from the Philips BC807 data sheet:

BASE =

1650 1 0 9

075

–. – .

RBASE = 13.6k

Picking the closest 1% resistor value yields:

RBASE = 14k

BOARD LAYOUT CONSIDERATION

As with all switching regulators, careful attention must be

paid to the PCB board layout and component placement.

To prevent electromagnetic interference (EMI) problems,

proper layout of high frequency switching paths is essen-

tial. Minimize the length and area of all traces connected to

the switching node pins (SW1 and SW2). Keep the feed-

back pins (FB1 and FB2) away from the switching nodes.

The DFN package has an exposed paddle that must be

connected to the system ground. The ground connection

for the feedback resistors should be tied directly to the

ground plane and not shared with any other component,

except the RT resistor, ensuring a clean, noise-free con-

nection. Recommended component placement is shown

in the Figure 11.

LBRX Datasheet(PDF) 14 Page - Linear Technology