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LT1370

500kHz High Efficiency 6A Switching Regulator

Linear Technology 

UU W U

APPLICATIO S I FOR ATIO

Layout Considerations

For maximum efficiency, LT1370 switch rise and fall times

are made as short as possible. To prevent radiation and

high frequency resonance problems, proper layout of the

components connected to the switch node is essential. B

field (magnetic) radiation is minimized by keeping output

diode, switch pin and output bypass capacitor leads as

short as possible. Figure 3 shows recommended posi-

tions for these components. E field radiation is kept low by

minimizing the length and area of all traces connected to

the switch pin. A ground plane should always be used

under the switcher circuitry to prevent interplane

coupling.

LT1370

The high speed switching current path is shown schemati-

cally in Figure 4. Minimum lead length in this path is

essential to ensure clean switching and low EMI. The path

including the switch, output diode and output capacitor is

the only one containing nanosecond rise and fall times.

Keep this path as short as possible.

More Help

For more detailed information on switching regulator

circuits, please see Application Note 19. Linear

Technology also offers a computer software program,

SwitcherCADTM, to assist in designing switching convert-

ers. In addition, our Applications Department is always

ready to lend a helping hand.

SwitcherCAD is a trademark of Linear Technology Corporation.

FB GND NFB

VC S/S VSW VIN

C

C

D

KEEP PATH FROM

VSW, OUTPUT DIODE,

OUTPUT CAPACITORS

AND GROUND RETURN

AS SHORT AS POSSIBLE

LT1370 • F03

Figure 3. Layout Considerations— R Package

SWITCH

L1 NODE

HIGH

VIN

FREQUENCY

CIRCULATING

PATH

Figure 4

VOUT

LOAD

LT1370 • F04

11

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