36V, 3.5A, 2.4MHz Step-Down DC/DC Converter Requires Only 75µA of Quiescent Current & Operates with 150ºC Maximum Junction Temperature

News Release ⎜ www.linear.com
36V, 3.5A, 2.4MHz Step-Down DC/DC Converter Requires Only
75uA of Quiescent Current & Operates with 150˚C
Maximum Junction Temperature
MILPITAS, CA – September 9, 2009 – Linear Technology announces the “H-grade” version of
the LT3680, a 3.5A, 36V step-down switching regulator with Burst Mode® operation to keep
quiescent current under 75uA. The LT3680 operates within a VIN range of 3.6V to 36V, making
it ideal for load dump and cold-crank conditions found in automotive applications. The H-grade
version operates up to a junction temperature of 150˚C, compared to the “E” and “I” versions’
125˚C maximum junction temperature. All electrical specifications are identical for the E, I and
H-grade versions. The H-grade devices are tested and guaranteed to the maximum junction
temperature of 150˚C, making them are ideal for automotive and industrial applications which
are subjected to high ambient temperatures.
The LT3680’s 4.6A internal switch can deliver up to 3.5A of continuous output current at
voltages as low as 0.79V. The LT3680’s Burst Mode operation ensures 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
250kHz to 2.4MHz, enabling the designer to optimize efficiency while avoiding critical
noise-sensitive frequency bands. The LT3680’s thermally enhanced MSOP-10E package and
high switching frequency keep external inductors and capacitors small, providing a compact,
thermally efficient footprint. Other features include external synchronization (from 250kHz to
2MHz), a power good flag and soft-start capability.
The LT3680HMSE is priced starting at $5.35 each in 1,000-piece quantities and is
available from stock. For more information, visit www.linear.com.
36V, 3.5A, 2.4MHz Step-Down DC/DC Converter Requires Only
75uA of Quiescent Current & Operates with 150˚C
Maximum Junction Temperature
page 2
Photo Caption: 36V, 3.5A Step-Down with Only 75uA Quiescent Current
Summary of Features: LT3680
Wide Input Range: 3.6V to 36V
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: 95m Ohm On-Resistance
0.790V Feedback Reference Voltage
Output Voltage: 0.79V to 30V
Thermal Protection
Soft-Start Capability
Small 10-Pin Thermally Enhanced MSOP
Maximum Junction Temperature of 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