Coolingzone.com - Dc-dc step-down regulator with integrated heat sink delivers up to 100A

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December 2012

Dc-dc step-down regulator with integrated heat sink delivers up to 100A

linear technology ltm4620 dual 13a per output or single 26a output dc-dc micromodule step-down regulator delivers up to 100a when four devices are current shared. device is a complete dc-dc regulator system in a 15mm x 15mm x 4.41mm lga package, including inductors, power stages and all control circuits. for optimum heat dissipation, a patented top side heat sink removes heat quickly and evenly. with 200lfm air flow, 12vin to 1.0vout and at full load of 26a (or 13a per output), device’s internal temperature rises to 60c above ambient. with the addition of an external heat sink to the top of the package and 200lfm air flow, the temperature rise is 40c.

linear_tech_ltm4620_product_image_220

features

complete standalone dual output power supply

dual 13a or single 26a output

wide input voltage range: 4.5v to 16v

output voltage range: 0.6v to 2.5v

±1.5% maximum total dc output error

multiphase current sharing with multiple ltm4620s up to 100a

differential remote sense amplifier

current mode control/fast transient response

adjustable switching frequency

overcurrent foldback protection

frequency synchronization

internal temperature sensing diode output

output overvoltage protection

low profile (15mm x 15mm x 4.41mm) lga package

the device supports frequency synchronization, multiphase operation, burst mode operation and output voltage tracking for supply rail sequencing and has an onboard temperature diode for device temperature monitoring. high switching frequency and a current mode architecture enable a very fast transient response to line and load changes without sacrificing stability.

fault protection features include overvoltage and overcurrent protection. the power module is offered in a proprietary space saving and thermally enhanced 15mm x 15mm x 4.41mm lga package with integrated top-side heat sink. the ltm4620 is rohs compliant with a pb-free finish.