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LTM4611

4611f

Safety Considerations

The LTM4611 modules do not provide galvanic isolation

from VIN to VOUT. There is no internal fuse. If required,

a slow blow fuse with a rating twice the maximum input

current needs to be provided to protect each unit from

catastrophic failure. The device does support overvoltage

protection and overcurrent protection.

Layout Checklist/Example

The high integration of LTM4611 makes the PCB board

layout very simple and easy. However, to optimize its

electrical and thermal performance, some layout consid-

erations are still necessary.

• Use large PCB copper areas for high current paths,

including VIN, GND and VOUT. It helps to minimize the

PCB conduction loss and thermal stress.

• Place high frequency ceramic input and output capaci-

tors next to the VIN, GND and VOUT pins to minimize

high frequency noise.

• Place a dedicated power ground layer underneath the

unit.

• To minimize the via conduction loss and reduce module

thermal stress, use multiple vias for interconnection

between top layer and other power layers.

• Do not put vias directly on the pad, unless they are

capped or plated over.

• Use a separated SGND ground copper area for com-

ponents connected to signal pins. Connect the SGND

to GND underneath the unit.

• For parallel modules, tie the respective COMP, VFB,

VOUT_LCL, TRACK/SS and RUN pins together. Use an

internal layer to closely connect these pins together.

Figure 17 gives a good example of the recommended

layout. Figures 18 and 19 show schematics of the

LTM4611 devices operating in parallel.

• To facilitate stuffing verification, test and debug activi-

ties, consider routing control signals of the LTM4611

with short traces to localized test points, test pads or

test vias–as PCB layout space permits. Both in-house

and contract manufacturers enjoy gaining electrical

access to all non low impedance (>10Ω) pins of an

IC or µModule device to improve in-circuit test (ICT)

coverage.

Figure 17. Recommended PCB Layouts

GND

VIN

4611 F17

CONTROL

SIGNAL

GROUND

VOUT

COUT

CIN

applicaTions inForMaTion

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