High Voltage, Low Quiescent Current Synchronous Step-Down DC/DC Controller Operates from -55°C to 125°C

News Release ⎜ www.linear.com
High Voltage, Low Quiescent Current Synchronous Step-Down DC/DC
Controller Operates from -55°C to 125°C
MILPITAS, CA – February 2, 2010 – Linear Technology Corporation announces a new high
reliability (MP) grade version of the LT3845, a 4V to 60V input voltage range, low quiescent
current synchronous step-down DC/DC controller. Its Burst Mode® operation keeps quiescent
current under 120uA in no load standby conditions, useful for extending run time in
battery-powered applications. The device’s powerful onboard N-channel MOSFET gate drivers
provide output current up to 20 amps at efficiencies as high as 95%, making it ideal for 12V and
24V automotive systems, industrial controls, heavy equipment, avionics and military systems.
The LT3845 can produce an output voltage from 1.23V to 36V. The switching frequency
is programmable from 100kHz to 500kHz or can be synchronized to an external clock up to
600kHz. Current mode control provides fast line and load transient response, as well as cycle-bycycle overcurrent protection. The onboard regulator provides IC power directly from the input
supply without the need for a separate bias voltage. Other features include short-circuit
protection, adjustable soft-start, thermal shutdown and precision input undervoltage lockout. The
LT3845 employs adaptive nonoverlap control, which maintains a constant dead time, preventing
shoot-through switch currents, independent of the type, size or operating conditions of the
external MOSFET switches.
The LT3845MP operates and is 100% tested over a junction temperature range of -55°C
to 125°C, compared to the I grade version’s -40°C to 125°C operating temperature range. It is
offered in 16-lead thermally enhanced TSSOP package. 1,000-piece price starts at $10.65 each.
For more information, visit www.linear.com.
High Voltage, Low Quiescent Current Synchronous Step-Down DC/DC
Controller Operates from -55°C to 125°C
page 2
Photo Caption: 60V Synchronous Step-Down DC/DC Controller
Summary of Features: LT3845
Wide 4V to 60V Input Voltage Range
Low 120uA Quiescent Current Extends Battery Run Time
Output Voltages from 1.23V to 36V
Up to 95% Efficiency
Onboard N-Channel MOSFET Gate Drivers
Integrated Onboard Regulator for IC Bias Voltage
Current Mode Control
Programmable Fixed Frequency from 100kHz to 500kHz
Synchronizable up to 600kHz
Adjustable Soft Start
Adaptive Nonoverlap Circuitry Prevents Switch Shoot-Through
About Linear Technology
Linear Technology Corporation, a manufacturer of high performance linear integrated circuits,
was founded in 1981, became a public company in 1986 and joined the S&P 500 index of major
public companies in 2000. Linear Technology products include high performance amplifiers,
comparators, voltage references, monolithic filters, linear regulators, DC-DC converters, battery
chargers, data converters, communications interface circuits, RF signal conditioning circuits,
uModule® products, and many other analog functions. Applications for Linear Technology’s
high performance circuits include telecommunications, cellular telephones, networking products
such as optical switches, notebook and desktop computers, computer peripherals,
video/multimedia, industrial instrumentation, security monitoring devices, high-end consumer
products such as digital cameras and MP3 players, complex medical devices, automotive
electronics, factory automation, process control, and military and space systems.
LT, LTC, LTM, uModule, Burst Mode and
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]
408-432-1900 ext 2233