33V (62V Transient), 3.5A(IOUT), 2.4MHz Step-Down DC/DC Converter with TJ(MAX)=150ºC

News Release ⎜ www.linear.com
33V (62V Transient), 3.5A(IOUT), 2.4MHz
Step-Down DC/DC Converter with TJ(MAX) = 150˚C
MILPITAS, CA – September 8, 2009 – Linear Technology announces the H-grade version of the
LT3972. The LT3972 is a 3.5A, 33V step-down switching regulator with Burst Mode® operation
to keep quiescent current under 75uA. The LT3972 operates within a VIN range of 3.6V to 33V,
with overvoltage lockout protection against transients as high as 62V, making it ideal for load
dump and cold-crank conditions found in automotive applications. Its internal 4.6A switch can
deliver up to 3.5A of continuous output current to voltages as low as 0.79V. The LT3972’s Burst
Mode operation offers ultralow quiescent current, well suited for applications such as automotive
or telecom systems, which demand always-on operation and optimum battery life. Switching
frequency is user programmable from 200kHz to 2.4MHz, enabling the designer to optimize
efficiency while avoiding critical noise-sensitive frequency bands. The combination of its
thermally enhanced MSOP-10E package and high switching frequency, which keeps external
inductors and capacitors small, provides a compact, thermally efficient footprint.
The H-grade version operates up to a junction temperature of 150˚C, compared to the
125˚C maximum junction temperature of the E- and I-grade versions. All electrical specifications
are identical for the E-, I- and H-grade versions. H-Grade parts are tested and guaranteed to a
maximum junction temperature of 150˚C and are ideal for automotive and industrial
applications, which are subjected to high ambient temperatures.
Pricing for the LT3972HMSE starts at $5.47 each in 1,000-piece quantities and is
available from stock. For more information, visit www.linear.com.
33V (62V Transient), 3.5A(IOUT), 2.4MHz
Step-Down DC/DC Converter with TJ(MAX) = 150˚C
page 2
Photo Caption: 33V (62V Transient) 3.5A Step-Down Converter with TJ(MAX) = 150˚C
Summary of Features: LT3972H
Wide Input Range: Operation from 3.6V to 33V
Overvoltage Lockout Protects Circuits Through 62V Transients
3.5A Maximum Output Current
Low Ripple (<15mVP-P) Burst Mode® Operation: IQ = 75uA at 12VIN to 3.3VOUT
Adjustable Switching Frequency: 200kHz to 2.4MHz
Low Shutdown Current: IQ < 1uA
Integrated Boost Diode
Synchronizable Between 250kHz to 2MHz
Power Good Flag
Saturating Switch Design: 95mOhm On-Resistance
Output Voltage: 0.79V to 30V
Thermal Protection
Soft-Start Capability
Small 10-Pin Thermally Enhanced MSOP
TJ(MAX) = 150˚C
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