17V, 2.25MHz, Synchronous Step-Down Regulator Delivers 1A & Requires Only 3.5µA of Quiescent Current

News Release ⎜ www.linear.com
17V, 2.25MHz, Synchronous Step-Down Regulator Delivers 1A & Requires
Only 3.5µA of Quiescent Current
MILPITAS, CA – April 9, 2013 – The LTC3621 is a high efficiency, 17V input capable
synchronous buck regulator from Linear Technology that delivers up to 1A of continuous output
current to outputs as low as 0.6V. Synchronous rectification delivers efficiencies as high as 95%
while Burst Mode® operation requires only 3.5µA of no load quiescent current. The LTC3621
switches at a fixed 1MHz frequency whereas the LTC3621-2 switches at 2.25MHz. Their
constant frequency, current-mode architecture minimizes switching noise while offering very
fast line and load transient response. The LTC3621/-2 operates from an input voltage range of
2.7V to 17V, making it ideal for single or dual cell Li-Ion applications as well as 12V
intermediate bus and automotive systems. The combination of its 2mm x 3mm DFN or MSOP-8
package high switching frequency and tiny, low cost capacitors and inductors ensures a highly
compact solution footprint.
The LTC3621/-2’s 60ns minimum on-time enables it to step-down 16V inputs to 2.5V
with a 2.25MHz switching frequency without pulse skipping, making it ideal for automotive
applications that must keep switching noise above the AM radio band. It’s 3.5µA quiescent
current make it well suited for always-on applications demanding maximum battery run time.
For applications that require the lowest possible noise, the LTC3621/-2 can be configured to run
in pulse-skipping or forced continuous mode, reducing noise and potential RF interference.
Additional features include a power good voltage monitor, internal compensation and thermal
17V, 2.25MHz, Synchronous Step-Down Regulator Delivers 1A & Requires
Only 3.5µA of Quiescent Current
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The LTC3621EDCB and LTC3621EDCB-2 are available in a 2mm x 3mm DFN-6, the
LTC3621EMS8E and LTC3621EMS8E-2 are offered in an 8-lead, thermally enhanced MSOP
package. Pricing for both package and frequency options starts at $2.55 each in 1,000-piece
quantities. Industrial grade versions, the LTC3621IDCB, LTC3621IDC 2, LTC3621IMS8E and
LTC3621IMS8E-2, are guaranteed to operate over the -40°C to 125°C operating junction
temperature range and are priced at $2.81 each in 1,000-piece quantities. All versions are
available from stock. For more information, visit www.linear.com/product/LTC3621.
Photo Caption: 17V, 1A Synchronous Step-Down Regulator Requires Only 3.5µA of
Quiescent Current
Summary of Features: LTC3621/-2
Wide VIN Range: 2.7V to 17V
Wide VOUT Range: 0.6V to VIN
95% Max Efficiency
Low IQ < 3.5μA, Zero-Current Shutdown
Constant Frequency Operation
o 1MHz:LTC3621
o 2.25MHz-LTC3621-2
Full Dropout Operation with Low IQ
1A Rated Output Current
+1% Output Voltage Accuracy
Current-Mode Operation for Excellent Line & Load Transient Response
Pulse-Skipping, Forced Continuous, Burst Mode® Operation
Internal Compensation and Soft-Start
Overtemperature Protection
Compact 6-Lead DFN 2mm × 3mm Package or 8-Lead MSOP Package with Power Good Output
& Independent SGND Pin
About Linear Technology
17V, 2.25MHz, Synchronous Step-Down Regulator Delivers 1A & Requires
Only 3.5µA of Quiescent Current
page 3
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 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
, 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.
Press Contacts:
North America / Worldwide
UK & Nordic
John Hamburger, Director Marketing
[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