LINEAR TECHNOLOGY CORPORATION
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MILPITAS, CA March 2, 2015 Linear Technology Corporation announces the LTC3899, a triple output (buck, buck, boost) 29µA quiescent current, synchronous DC/DC controller that maintains output voltage regulation over a
2.2V to 60V input range. A 12V car battery can droop to less than 4 volts during engine restart or cold crank, causing reset of infotainment systems and other electronics that operate from 5 volts and higher. The boost converter feeds two stepdown converters, avoiding output voltage dropout when a car battery droops, a useful feature in automotive start/stop systems that shut off the engine at idle to save fuel. The 60V maximum input voltage covers double battery truck applications. Alternatively, the buck controllers can be powered from the input as a general purpose triple output controller.
The LTC3899 operates from an input voltage of 4.5V to 60V during startup and maintains operation down to 2.2V
after startup. The boost and buck converters can produce output voltages up to 60V with efficiencies as high as
95%. In applications where the input voltage may exceed the regulated output voltage, the LTC3899 keeps the synchronous boost MOSFET on continuously so that the output voltage follows the input voltage with minimal power loss.
In addition, the LTC3899 can be configured for Burst Mode® operation, reducing quiescent current to 29µA for one channel (39µA for all three channels on) with outputs in regulation in standby mode, a useful feature for preserving battery run times. The powerful 1ohm onboard all Nchannel gate drivers minimize MOSFET switching losses and provide for output currents of more than 10 amps per channel, limited only by external components. Furthermore, the output current for each converter can be sensed by monitoring the voltage drop across the inductor (DCR) or by using a sense resistor. The LTC3899's constant frequency current mode architecture enables a fixed frequency from
50kHz to 900kHz or it can be synchronized to an external clock from 75kHz to 850kHz. Additional features include an onboard LDO for IC power and gate drive, output voltage tracking or adjustable softstart, a power good signal and an optional external VCC bias input.
The LTC3899 is available in 38lead SSOP and 38pin 5mm x 7mm QFN packages. Four temperature grades are available, with operation from 40 to 125°C for the extended and industrial grades, a high temp automotive grade of
40°C to 150°C and a military grade of 55°C to 150°C. The 1,000piece price starts at $4.95 each. For more information, visit www.linear.com/product/LTC3899.
All Outputs Remain in Regulation During
Engine Restart
Wide Input Voltage Range: 4.5V to 38V During StartUp, Down to 2.2V After StartUp
Boost Output Voltage Up to 60V Buck Output Voltage Range: 0.8V to
60V
Low 29µA Quiescent Current During
Standby Condition
Up to 95% Efficiency
Powerful Onboard All NChannel Gate
Drivers
RSENSE or DCR Current Sensing
Power Up/Down Tracking & Sequencing
Current Mode Control
Fixed Programmable Operating Frequency from 50kHz to 900kHz Synchronizable Operating Frequency from 75kHz to 850kHz
Extended & Industrial Temp Grades:
40°C to 125°C Operating Junction Temp
Automotive Temp Grade: 40°C to 150°C
Triple Output Buck/Buck/Boost DC/DC Controller Click Photo for HighRes ImageOperating Junction Temp
Military Temp Grade: 55°C to 150°C Operating Junction Temp
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 of
Linear Technology Corp. All other trademarks are the property of their respective owners.
John Hamburger
Tel: (408) 4321900 ext. 2419 jhamburger@linear.com
Doug Dickinson
Tel: (408) 432 1900 ext. 2233 ddickinson@linear.com
Fanny Lau
Tel: 85224280303 flau@linear.com
Angela Ao
Tel: (8610)6522 8081 angela.ao@ebacomms.com
Yoshikazu Funasaki Tel: 81352267291 yfunasaki@linear.com
Takashi Matsuda
Tel: +81332558411 linear@chugaiad.co.jp
Desiree Park
Tel: +8225656625 desiree@ezwire.com
Alice Wang
Tel: +886228974705 alice@ezwire.com
Ralf Stegmann
Tel: +49 (0) 7131923411 ralf@ezwire.com
Alan Timmins
Tel: +441252629937 alan@ezwire.com
Simona Labianca
Tel: +39 340 0571697 simona@ezwire.com
Clotilde Zeller
Tel: +33 1 4614 87 09 clotilde@ezwire.com
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