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60V, 4A Synchronous Step­Down Regulator with Adjustable Rail­to­Rail Output & Wire Drop Compensation


MILPITAS, CA ­ January 18, 2016 ­ The LTC3649 is a high efficiency, 60V, 4A synchronous buck regulator that incorporates a constant frequency, current mode architecture and programmable output current and output voltage, which are set with a single external resistor. The LTC3649 operates from an input voltage range of 3.1V to 60V and

provides an adjustable rail­to­rail output voltage range from 0V to 0.5V below VIN, while delivering up to 4A of continuous output current. Its wide input and output voltage range is ideal for a wide range of test, measurement and

industrial applications. The LTC3649's unique design includes an accurate internally generated 50µA current

source on the ISET pin, enabling it to deliver outputs as low as 0V with the use of a single external programming resistor. Furthermore, the LTC3649 offers ±0.8% output voltage accuracy and programmable output current with

±4% accuracy without a sense resistor. Its switching frequency is user programmable from 300kHz to 3MHz, enabling the use of tiny, low cost capacitors and inductors. Combined with a 28­lead 4mm x 5mm QFN or thermally enhanced TSSOP package, the LTC3649 offers a very compact solution footprint.


The LTC3649 uses internal power switches with RDS(ON) of only 100mOhms and 50mOhms to deliver efficiencies as high as 95%. Burst Mode® operation offers high efficiency at light loads, requiring only 440µA of quiescent

current. For noise sensitive applications, the LTC3649 can run in forced continuous mode, offering very low output ripple. Additional features include ±4% accurate output current monitoring, a power good voltage monitor, programmable wire drop compensation, external synchronization capability and thermal protection.


The LTC3649EUFD is available in a 4mm x 5mm QFN­28, the LTC3649EFE is offered in a 28­lead, thermally enhanced TSSOP package. Industrial grade versions, the LTC3649IUFD and LTC3649IFE, are guaranteed to operate over the ­40°C to 125°C operating junction temperature range. Pricing starts at $5.65 each in 1,000­piece quantities. All versions are available from stock. For more information, visit www.linear.com/product/LTC3649.


Summary of Features: LTC3649


Wide VIN Range: 3.1V to 60V

Wide VOUT Range: 0V to (VIN ­ 0.5V) Single Resistor VOUT Programming Integrated 110mΩ Top N­Channel/50mΩ

Bottom N­Channel MOSFETs

95% Efficiency with 12VIN and 5VOUT Active IQ: 440µA, Shutdown IQ: 15µA Accurate Current Monitoring (±4%)

without Sense Resistor

Accurate Resistor Programmable Frequency (300kHz to 3MHz) with ±50% Frequency Sync Range

Accurate Programmable Output Current Limit

Input Voltage Regulation for MPPT Applications

±0.8% Output Voltage Accuracy Peak Current Mode Operation

Programmable Wire Drop Compensation Burst Mode® Operation, Forced

Continuous Mode

Internal Compensation & Programmable Soft­Start

Overtemperature Protection Available in Thermally Enhanced 28­ Lead 4mm x 5mm QFN & TSSOP Packages

60V, 4A Monolithic Synchronous Step­Down Regulator Offers 95% Efficiency & Rail­to­Rail Outputs



Click Photo for High­Res Image

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, Burst Mode and µModule are registered trademarks and Hot Swap is a trademark of Linear Technology Corp. All other trademarks are the property of their respective owners.


Worldwide Contacts


North America and General Information John Hamburger

Tel: (408) 432­1900 ext. 2419

jhamburger@linear.com


Doug Dickinson

Tel: (408) 432 1900 ext. 2233

ddickinson@linear.com

China (PRC) Fanny Lau

Tel: 852­2428­0303

flau@linear.com


Angela Ao

Tel: (8610)6522 8081

angela.ao@ebacomms.com

Japan

Yoshikazu Funasaki Tel: 81­3­5226­7291

yfunasaki@linear.com


Takashi Matsuda

Tel: +81­3­3255­8411

linear@chugai­ad.co.jp


Korea Desiree Park

Tel: +82­2­565­6625

desiree@ezwire.com

Taiwan Alice Wang

Tel: +886­2­28974705

alice@ezwire.com

Germany

Ralf Stegmann

Tel: +49 (0) 71319234­11

ralf@ezwire.com


UK & Nordic Alan Timmins

Tel: +44­1252­629937

alan@ezwire.com

Italy

Simona Labianca

Tel: +39 340 0571697

simona@ezwire.com

France Clotilde Zeller

Tel: +33 1 4614 87 09

clotilde@ezwire.com


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Linear Technology Corporation issued this content on 2016-01-18 and is solely responsible for the information contained herein. Distributed by Public, unedited and unaltered, on 2016-01-19 18:09:17 UTC

Original Document: http://www.linear.com/docs/47622