LTC3732CUHF View Datasheet(PDF) - Linear Technology

Part Name

Description

Manufacturer

LTC3732CUHF

3-Phase, 5-Bit VID, 600kHz, Synchronous Buck Switching Regulator Controller

Linear Technology 

LTC3732

APPLICATIO S I FOR ATIO

3) Are the SENSE– and SENSE+ printed circuit traces for

each channel routed together with minimum PC trace

spacing? The filter capacitors between SENSE+ and SENSE–

for each channel should be as close as possible to the pins

of the IC. Connect the SENSE– and SENSE+ pins to the

pads of the sense resistor as illustrated in Figure 12.

4) Do the (+) plates of CPWR connect to the drains of the

topside MOSFETs as closely as possible? This capacitor

provides the pulsed current to the MOSFETs.

5) Keep the switching nodes, SWITCH, BOOST and TG

away from sensitive small-signal nodes (SENSE+, SENSE–

IN+, IN–, EAIN). Ideally the SWITCH, BOOST and TG

printed circuit traces should be routed away and separated

from the IC and the “quiet” side of the IC. Separate the high

dV/dt traces from sensitive small-signal nodes with ground

traces or ground planes.

6) Use a low impedance source such as a logic gate to drive

the PLLIN pin and keep the lead as short as possible.

SW1

L1

RSENSE1

D1

VIN

RIN +

CIN

L2

VOUT

SW2

RSENSE2

+

D2

COUT

RL

BOLD LINES INDICATE HIGH,

SWITCHING CURRENT LINES.

KEEP LINES TO A MININMUM

LENGTH

SW3

D3

L3

RSENSE3

3732 F11

Figure 11. Branch Current Waveforms

3732f

23

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