6A, 2.5MHz, 42V Boost/Inverting DC/DC Converter with Fault Protection

News Release ⎜ www.linear.com
6A, 2.5MHz, 42V Boost/Inverting DC/DC
Converter with Fault Protection
MILPITAS, CA – June 3, 2010 – Linear Technology Corporation announces the LT3579, a
current mode, fixed frequency step-up DC/DC converter with integrated fault protection features
for output shorts, input/output overvoltages, and overtemperature conditions. The LT3579
incorporates two integrated 42V switches, a 3.4A master switch and a 2.6A slave switch, which
can be tied together for a total current of 6A. The LT3579 operates from an input voltage range
of 2.5V to 16V, with transient protection to 40V, making it suitable for applications with input
sources ranging from a single-cell Li-Ion to automotive inputs. The LT3579 is ideal for many
local power supply designs as it can be configured as either a boost, SEPIC or an inverting
converter. The device’s 4mm x 5mm QFN package (or TSSOP-20E) and tiny externals ensure a
very compact footprint while minimizing solution cost.
The LT3579’s low VCESAT switches, 0.25V (tied together at 5.5A), deliver efficiencies up
to 90%. With both switches combined from a 5V input, the LT3579 can deliver up to 1.7A at
12V or 1.2A at -12V. For high voltage outputs, the LT3579’s slave switch enables high power
charge pump topologies which are very efficient and require few external components. The
LT3579’s switching frequency can be programmed via a single resistor or synchronized to an
external clock between 200kHz and 2.5MHz, minimizing external component sizes and avoiding
“noise critical” frequency bands. Undervoltage lockout (UVLO) is user adjustable for optimal
system performance. A single feedback resistor sets the output voltage, minimizing external
6A, 2.5MHz, 42V Boost/Inverting DC/DC
Converter with Fault Protection
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components. Other features include external synchronization capability and junction temperature
For applications requiring higher output current, the LT3579-1 offers a CLKOUT pin
signal that is 180°C out of phase with the internal oscillator, enabling the device to be used in
multiphase applications.
The LT3579EUF and LT3579-1EUF are available in 4mm x 5mm QFN-20 packages,
priced starting at $3.30 each for 1,000 piece quantities. The LT3579EFE and
LT3579-1EFE are also available in a thermally enhanced TSSOP-20 packages, priced starting at
$3.45 each for 1,000 piece quantities. Industrial temperature (-40°C to 125°C) versions, the
LT3579IUFD, LT3579-1IUFD and the LT3579IFE, LT3579-1IFE are also available from stock.
Pricing starts at $3.67 and $3.83 each, respectively for 1,000 piece quantities. For more
information, visit http://www.linear.com/pr/3579.
Photo Caption: 6A, 42V Boost/Inverting DC/DC Converter with Integrated Fault Protection
Summary of Features: LT3579/-1
6A, 42V Combined Power Switch
Output Short Circuit Protection
Wide Input Range: 2.5V to 16V Operating, 40V Maximum Transient
LT3579-1: Dual-Phase Capable
Master/Slave (3.4A/2.6A) Switch Design
User Configurable Undervoltage Lockout
Easily Configurable as a Boost, SEPIC, Inverting or Flyback Converter
Low VCESAT Switch: 250mV at 5.5A (Typical)
Can be Synchronized to External Clock
Can Synchronize Other Switching Regulators
High Gain SHDN Pin Accepts Slowly Varying Input Signals
20-Lead TSSOP & 20-Pin 4mm × 5mm QFN Packages
6A, 2.5MHz, 42V Boost/Inverting DC/DC
Converter with Fault Protection
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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 and
are registered trademarks of Linear Technology Corp. All other trademarks are the
property of their respective owners.
Press Contacts:
North America / Worldwide
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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