DC/DC Controller Makes Positive or Negative Regulated Voltages

News Release ⎜ www.linear.com
DC/DC Controller Makes Positive or Negative Regulated Voltages
MILPITAS, CA – May 18, 2009 – Linear Technology Corporation announces the LT3757, a
wide input range DC/DC controller for boost, flyback, SEPIC and inverting power supply
applications, capable of generating either positive or negative regulated output voltages. The
LT3757 has two voltage feedback error amplifiers and reference voltages. One set is for positive
output voltages, with a 1.60V reference voltage, the other is for negative output voltages, with a
-0.80V reference voltage, both off a single feedback pin, making the LT3757 a highly versatile
DC/DC controller for many types of power supply designs.
The LT3757 operates with an input voltage range from 2.9V to 40V, achieves
efficiencies up to 96%, and is well suited for industrial, automotive, medical and telecom
applications. 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. The fixed frequency, current-mode control results in stable operation over
a wide range of supply and output voltages, along with all ceramic capacitor designs, enabling a
smaller solution size.
The LT3757 drives an external N-channel MOSFET from an internally regulated 7.2V
supply. Programmable soft-start allows for control of the output voltage turn-on time. In
addition, the LT3757 features a programmable input undervoltage lockout with hysteresis, along
with output overvoltage and overcurrent protection.
The LT3757 is offered in thermally enhanced MSOP-10 and 3mm x 3mm DFN-10
packages, both with extended and industrial temperature ranges from -40°C to 125°C. The
1000-piece price starts at $2.06 each. For more information, visit www.linear.com.
DC/DC Controller Makes Positive or Negative Regulated Voltages
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Photo Caption: Boost, Flyback, SEPIC & Inverting Controller
Summary of Features: LT3757
For Boost, Flyback, SEPIC & Inverting Applications
Wide Input Operating Voltage: 2.9V to 40V
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
Integrated Low-Side Driver
True Current Mode Control
Internal 7.2V Low Dropout Voltage Regulator
Low Shutdown Current < 1uA
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.
are registered trademarks of Linear Technology Corp. All other
LT, LTC, LTM, uModule and
trademarks are the property of their respective owners.
Press Contacts:
John Hamburger, Director Marketing Communications
[email protected]
408-432-1900 ext 2419
Doug Dickinson, Media Relations Manager
[email protected]
408-432-1900 ext 2233