42V, 4A (IOUT), Synchronous Step-Down Silent Switcher Needs Only 2.5µA of Quiescent Current

News Release  www.linear.com
42V, 4A (IOUT), Synchronous Step-Down Silent Switcher
Needs Only 2.5µA of Quiescent Current
MILPITAS, CA – October 21, 2013 – Linear Technology Corporation announces the LT8614, a
4A, 42V input capable synchronous step-down switching regulator. A unique Silent Switcher™
architecture reduces EMI/EMC emissions by more than 20dB, well below the CISPR 25 Class 5
limit. Even with switching frequencies in excess of 2MHz, synchronous rectification delivers
efficiency as high as 96% while Burst Mode® operation keeps quiescent current under 2.5µA in
no-load standby conditions. Its 3.4V to 42V input voltage range makes it ideal for automotive
and industrial applications.
The LT8614’s internal high efficiency switches can deliver up to 4A of continuous output
current to voltages as low as 0.97V. Its Burst Mode operation provides ultralow quiescent
current, making it well suited for applications such as automotive “always-on” systems, which
need to extend operating battery life. The LT8614’s unique design maintains a minimum dropout
voltage of only 200mV at 1A under all conditions, enabling it to excel in scenarios such as
automotive cold-crank. Furthermore, a fast minimum on-time of only 30ns enables 2MHz
constant frequency switching from a 16V input to a 1.0V output, enabling designers to optimize
efficiency while avoiding critical noise-sensitive frequency bands. The LT8614’s 20-lead 3mm x
4mm QFN package and high switching frequency keeps external inductors and capacitors small,
providing a compact, thermally efficient footprint.
The LT8614 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
42V, 4A (IOUT), Synchronous Step-Down Silent Switcher Needs
Only 2.5µA of Quiescent Current
page 2
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 LT8614’s current-mode topology
enables fast transient response and excellent loop stability. Other features include internal
compensation, a power good flag, output soft-start/tracking and thermal protection.
The LT8614EUDC is packaged in a 3mm x 4mm QFN package and is priced starting at
$4.25 each. An industrial temperature version, the LT8614IUDC, is tested and guaranteed to
operate from a -40°C to 125°C operating junction temperature and is priced starting at $4.68
each. An automotive temperature version, the LT8614HUDC, is tested and guaranteed to operate
from a -40°C to 150°C operating junction temperature and is priced starting at $4.93 each. All
pricing is for 1,000-piece quantities and all versions are available from stock. For more
information, visit www.linear.com/product/LT8614
Photo Caption: 42V, 4A (IOUT), 2.2MHz Synchronous Step-Down Reduces EMI/EMC
Emissions by over 20dB
Summary of Features: LT8614
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Silent Switcher™ Architecture:
o Ultralow EMI/EMC Emissions
o High Efficiency at High Frequency
Up to 96% Efficiency
Wide Input Voltage Range: 3.4V to 42V
Ultralow Quiescent Current Burst Mode® Operation: 2.5µA IQ Regulating 12VIN to 3.3VOUT with
Output Ripple < 10mVP-P
High Efficiency Synchronous Operation
Fast Minimum Switch-On Time: 30ns
Low Dropout under All Conditions: 200mV at 1A
Adjustable & Synchronizable: 200kHz to 3MHz
Peak Current-Mode Operation
Accurate 1V Enable Pin Threshold
Internal Compensation
Output Soft-Start & Tracking
Small 20-Lead 3mm × 4mm QFN
42V, 4A (IOUT), Synchronous Step-Down Silent Switcher Needs
Only 2.5µA of Quiescent Current
page 3
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
Silent Switcher is a trademark of Linear Technology Corp. All other trademarks are the property of their respective
owners.
Press Contacts:
North America / Worldwide
UK & Nordic
John Hamburger, Director Marketing
Communications
[email protected]
Tel: 408-432-1900 ext 2419
Alan Timmins
[email protected]
Tel: +44-1-252-629937
Doug Dickinson, Media Relations Manager
[email protected]
Tel: 408-432-1900 ext 2233
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