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LTC3728L-1

3728l1fc

APPLICATIONS INFORMATION

be connected between the (+) terminal of COUT and signal

ground. The R2 and R4 connections should not be along

the high current input feeds from the input capacitor(s).

4. Are the SENSE – and SENSE + leads routed together with

minimum PC trace spacing? The ﬁlter capacitor between

SENSE+ and SENSE– should be as close as possible to

the IC. Ensure accurate current sensing with Kelvin con-

nections at the SENSE resistor.

5. Is the INTVCC decoupling capacitor connected close to

the IC, between the INTVCC and the power ground pins?

This capacitor carries the MOSFET drivers current peaks.

An additional 1μF ceramic capacitor placed immediately

next to the INTVCC and PGND pins can help improve noise

performance substantially.

6. Keep the switching nodes (SW1, SW2), top gate nodes

(TG1, TG2), and boost nodes (BOOST1, BOOST2) away

from sensitive small-signal nodes, especially from the

opposites channel’s voltage and current sensing feedback

pins. All of these nodes have very large and fast moving

signals and therefore should be kept on the “output side”

of the LTC3728L-1 and occupy minimum PC trace area.

Figure 11. Branch Current Waveforms

RL1

SW1

RSENSE1

VOUT1

COUT1

VIN

CERAMIC

CIN

RIN

RL2

BOLD LINES INDICATE

HIGH SWITCHING

CURRENT. KEEP LINES

TO A MINIMUM LENGTH.

SW2

3728L1 F11

RSENSE2

VOUT2

COUT2

CERAMIC

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