20A Step-Down µModule Regulator Optimized for Low VIN to Low VOUT Conversion Delivers 88% Efficiency & Only 37°C Temperature Rise

News Release  www.linear.com
20A Step-Down μModule Regulator Optimized for Low VIN to Low VOUT
Conversion Delivers 88% Efficiency & Only 37°C Temperature Rise
MILPITAS, CA – December 4, 2014 – Linear Technology Corporation introduces the LTM4639,
a 20A DC/DC step-down μModule® (micromodule) regulator capable of converting 2.5V to 7V
main-power system rails to point-of-load voltages as low as 0.6V with optimum efficiency. In
complex rack-mount systems, improved voltage conversion efficiency results in savings in
energy consumption, thermal management and equipment size. Applications include cloud-based
equipment and RAID systems where 3.3V is preferred as the main power distribution rail.
The LTM4639 is a complete switching point-of-load power supply and includes the
inductor, MOSFETs, DC/DC controller and compensation circuitry. It is housed in a 4.92mm
height BGA package with a 15mm x 15mm footprint. For 3.3V input to 1.5V output conversion
at 20A load, efficiency is 88%, power loss is 3.9W, and junction temperature rise above ambient
temperature is 37°C. The micromodule regulator provides a precise output voltage regulation:
total DC error of maximum ±1.5%, guaranteed from -40°C to 125°C. Up to four devices can be
paralleled for up to 80A output while operating out-of-phase to reduce the number of input and
output capacitors.
The LTM4639’s input supply range is 2.375V to 7V. For operation from 3.3V and lower,
a 5V low power auxiliary supply is needed to bias internal circuitry. Output voltage ranges from
0.6V to 5.5V, with protection functions for overcurrent and overvoltage conditions.
The LTM4639 is rated for operation from -40°C to 125°C. The 1,000-piece price is
$19.45 each. For more information, visit www.linear.com/product/LTM4639
20A Step-Down μModule Regulator Optimized for Low VIN to Low VOUT
Conversion Delivers 88% Efficiency & Only 37°C Temperature Rise
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Photo Caption: 20A Step-Down μModule Regulator Optimized for Low VIN to Low VOUT
Conversion
Summary of Features: LTM4639
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Low Input Supply Range, Targeting 3.3V Input Supply Rails: 2.375V to 7V
Low Output Voltage Regulation, Targeting Sub-2V & Sub-1V Loads Such as ASICs & FPGAs:
0.6V to 5.5V
Precision total DC Output Voltage Regulation Over Temperature: ±1.5% Error
Current Sharing up to 80A with Four Devices in Parallel
Small Package: 15mm x 15mm x 4.92mm BGA
The USA list pricing shown is for budgetary use only. International prices may differ due to local
duties, taxes, fees and exchange rates.
About Linear Technology Linear Technology Corporation, a member of the S&P 500, has been designing, manufacturing and marketing a broad line of high performance analog integrated circuits for major companies worldwide for over three decades. The Company’s products provide an essential bridge between our analog world and the digital electronics in communications, networking, industrial, automotive, computer, medical, instrumentation, consumer, and military and aerospace systems. Linear Technology produces power management, data conversion, signal conditioning, RF and interface ICs, µModule® subsystems, and wireless sensor network products. For more information, visit www.linear.com
, LT, LTC, LTM, Linear Technology, the Linear logo and µModule are registered trademarks of Linear
Technology Corp. All other trademarks are the property of their respective owners.
Press Contacts:
North America / Worldwide
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John Hamburger, Director Marketing
Communications
jhamburger@linear.com
Tel: 408-432-1900 ext 2419
Alan Timmins
alan@ezwire.com
Tel: +44-1-252-629937
Doug Dickinson, Media Relations Manager
ddickinson@linear.com
Tel: 408-432-1900 ext 2233