LINEAR TECHNOLOGY CORPORATION
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MILPITAS, CA December 10, 2014 Linear Technology Corporation announces the LT8640, a 5A, 42V input capable synchronous stepdown switching regulator. A unique Silent Switcher™ architecture, combined with spread spectrum frequency modulation, reduces EMI/EMC emissions by more than 25dB even with switching frequencies in excess of 2MHz, enabling it to easily pass the automotive CISPR25, Class 5 peak limits. Synchronous rectification delivers efficiency as high as 95% with a switching frequency of 2MHz. Its 3.4V to 42V input voltage range makes it ideal for automotive and industrial applications.
The LT8640's internal high efficiency switches deliver up to 5A of continuous output current and peak loads of 7A to voltages as low as 0.97V. The devices's Burst Mode® operation keeps quiescent current under 2.5µA in noload standby conditions, making it well suited for applications such as automotive "alwayson" systems, which need to extend operating battery life. The LT8640's unique design maintains a minimum dropout voltage of only 100mV at
1A under all conditions, enabling it to excel in scenarios such as automotive coldcrank. Furthermore, a fast minimum ontime of only 40ns enables 2MHz constant frequency switching from a 16V input to a 1.5V output, equipping designers to optimize efficiency while avoiding critical noisesensitive frequency bands. The LT8640's 20 lead 3mm x 4mm QFN package and high switching frequency keep external inductors and capacitors small, providing a compact, thermally efficient footprint.
The LT8640 utilizes internal top and bottom high efficiency power switches with the necessary boost diode, oscillator, control and logic circuitry integrated into a single die. Low ripple Burst Mode operation maintains high efficiency at low output currents while keeping output ripple below 10mVPK
PK. Special design techniques and a
new high speed process enable high
efficiency over a wide input voltage range, and the LT8640's currentmode topology enables fast transient response and excellent loop stability. Other features include internal compensation, a power good flag, output softstart/tracking and thermal
protection.
The LT8640EUDC is packaged in a 3mm x 4mm QFN package and is priced at $4.35 each. An industrial
temperature version, the LT8640IUDC, is tested and guaranteed to operate from a 40°C to 125°C operating junction temperature and is priced at $4.79 each. An automotive temperature version, the LT8640HUDC, is tested and guaranteed to operate from a 40°C to 150°C operating junction temperature and is priced at $5.04 each. All pricing is for 1,000piece quantities and all versions are available from stock. For more information, visit www.linear.com/product/LT8640.
Silent Switcher™ Architecture: Ultralow EMI/EMC Emissions Spread Spectrum Frequency Modulation
High Efficiency at High Frequency
Up to 96% Efficiency at 1MHz
Up to 95% Efficiency at 2MHz
Wide Input Voltage Range:
3.4V to 42V
Ultralow Quiescent Current Burst Mode® Operation:
2.5µA IQ Regulating 12VIN to 3.3VOUT, Output Ripple PP
Fast Minimum SwitchOn Time: 40ns
Low Dropout Under All Conditions:
100mV at 1A
Safely Tolerates Inductor Saturation in
Overload
LT8640 Click Photo for HighRes ImageAdjustable & Synchronizable:
200kHz to 3MHz
Peak Current Mode Operation Accurate 1V Enable Pin Threshold Internal Compensation
Output SoftStart & Tracking
Small 18Lead 3mm x 4mm QFN
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
Ralf Stegmann
Tel: +49 (0) 7131 923411 ralf@ezwire.com
Clotilde Zeller
Tel: +33 1 4614 87 09 clotilde@ezwire.com
Desiree Park
Tel: +8225656625 desiree@ezwire.com
Alan Timmins
Tel: +441252629937 alan@ezwire.com
Simona Labianca
Tel: +39 340 0571697 simona@ezwire.com
Alice Wang
Tel: + 886228974705 alice@ezwire.com
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