140V, 250mA High Efficiency Buck Converter with Only 12µA Quiescent Current

News Release  www.linear.com
140V, 250mA High Efficiency Buck Converter with
Only 12µA Quiescent Current
MILPITAS, CA – February 4, 2014 – Linear Technology announces the LTC3638, a 140V inputcapable high efficiency buck converter that delivers up to 250mA of continuous output current. It
operates from an input voltage range of 4V to 140V, making it ideal for telecom, industrial,
avionic and automotive applications. The LTC3638 utilizes internal synchronous rectification
and a programmable hysteretic-mode design to optimize efficiency over a broad range of output
currents. It delivers efficiencies as high as 88% and requires only 12µA of quiescent current,
maximizing battery run time. A user-programmable output current limit can be set from 20mA to
250mA as required by the application. The LTC3638 can be programmed with fixed output
voltages of 1.8V, 3.3V or 5V or a resistor divider can be used to program outputs from 0.8V to
VIN. The LTC3638’s thermally enhanced skipped-lead MSOP package offers the additional pin
spacing required for high voltage inputs. The combination of its MSOP package and only four
tiny externals provide a highly compact solution footprint for a wide range of applications.
The LTC3638 utilizes internal high side and synchronous power switches which draw
only 12µA at no load while maintaining output voltage regulation, making it ideal for always on
battery-powered applications. Due to the inherent stability of the converter, no external
compensation is required, thereby simplifying design and minimizing the solution footprint.
Additional features include a precise 0.8V +1% feedback voltage reference, internal or external
soft-start and a feedback comparator output, which enables multiple LTC3638s to be connected
in parallel for higher current applications.
140V, 250mA High Efficiency Buck Converter with
Only 12µA Quiescent Current
page 2
Pricing for the LTC3638EMSE starts at $3.65 each. An industrial temperature version,
the LTC3638IMSE, is guaranteed over a -40°C to 125°C operating junction temperature and is
priced starting at $4.02 each. An automotive temperature version, the LTC3638HMSE, is
guaranteed from -40°C to 150°C operating junction temperature and is priced starting at $4.27
each. Finally, a high reliability military plastic version, the LTC3638MPMSE, is tested and
guaranteed to meet spectacular over a -55°C to 150°C operating junction temperature and is
priced starting at $10.84 each. All pricing is in 1,000-piece quantities and all versions are
available from stock. For more information, visit www.linear.com/product/LTC3638
Photo Caption: 140V, 250mA Synchronous Buck Converter
Summary of Features: LTC3638
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Wide Operating Input Voltage Range: 4V to 140V
Synchronous Operation for Highest Efficiency
Adjustable 20mA to 250mA Maximum Output Current
Internal High Side & Low Side Power MOSFETs
No Compensation Required
Low Dropout Operation: 100% Duty Cycle
Low Quiescent Current: 12μA
Wide Output Range: 0.8V to VIN
0.8V +1% Feedback Voltage Reference
Precise RUN Pin Threshold
Internal or External Soft-Start
Programmable 1.8V, 3.3V, 5V or Adjustable Output
Few External Components Required
Programmable Input Overvoltage Lockout
Thermally Enhanced High Voltage MSOP Package
About Linear Technology 140V, 250mA High Efficiency Buck Converter with
Only 12µA 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 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 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
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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