5A DC/DC Converter Generates Either a Positive or a Negative Regulated Voltage

News Release ⎜ www.linear.com
5A DC/DC Converter Generates Either a
Positive or a Negative Regulated Voltage
MILPITAS, CA – June 15, 2010 – Linear Technology Corporation announces the LT3957, a
highly versatile DC/DC converter for boost, flyback, SEPIC and inverting power supply
applications. This device operates over an input voltage range of 3V to 40V, has an onboard
5A/40V power switch and achieves efficiencies up to 96%, making it well suited for industrial,
automotive, medical and telecom applications.
The LT3957 can generate either a positive or negative regulated output voltage with its
two internal voltage feedback error amplifiers and reference voltages. One set is for positive
output voltages and the other is for negative output voltages, both off a single feedback pin. With
a programmable fixed or synchronizable operating frequency from 100kHz to 1MHz, designers
can choose a wide range of inductors and capacitors to optimize size, performance and cost. Its
current-mode control results in stable operation over a wide range of supply and output voltages.
The device supports designs using only ceramic capacitors, enabling a smaller solution size.
Additional features include programmable soft-start, adjustable input undervoltage lockout, as
well as output overvoltage and overcurrent protection.
The LT3957 operates from a -40°C to 125°C temperature range and is offered in a
5mm x 6mm QFN-36 package with additional pin spacing to support high voltage operation. The
1000-piece price starts at $2.95 each. For more information, visit http://www.linear.com/pr/3957.
5A DC/DC Converter Generates Either a
Positive or a Negative Regulated Voltage
page 2
Photo Caption: Boost, Flyback, SEPIC & Inverting DC/DC Converter
Summary of Features: LT3957
For Boost, Flyback, SEPIC & Inverting Applications
Wide Input Operating Voltage: 3V to 40V
Onboard 5A/40V Power Switch
Positive or Negative Output Voltage Setting with a Single Feedback Pin
Selectable Fixed 100kHz to 1MHz Operating Frequency
Synchronizable to an External Clock
Programmable Soft Start
True Current-Mode Control
Additional Pin to Pin IC Spacing
Output Overvoltage & Overcurrent Protection
Programmable Input Undervoltage Lockout with Hysteresis
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
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