LTC1628 datasheet(28/32 Pages) LINER

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LTC1628/LTC1628-PG

Figure 11. Branch Current Waveforms

APPLICATIO S I FOR ATIO

signal ground and a small VOSENSE decoupling capacitor

should be as close as possible to the LTC1628 SGND pin.

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 connections 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 1

µF 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 LTC1628 and occupy minimum PC trace area.

RL1

SW1

RSENSE1

VOUT1

COUT1

VIN

CIN

RIN

RL2

BOLD LINES INDICATE

HIGH, SWITCHING

CURRENT LINES.

KEEP LINES TO A

MINIMUM LENGTH.

SW2

1628 F11

RSENSE2

VOUT2

COUT2

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