News Release ? www.linear.com
Synchronous Step-Down DC/DC Controller Delivers Up to 95% Efficiency with 2MHz Operating FrequencyMILPITAS, CA
- January 17, 2012 - Linear Technology Corporation introduces
the LTC3839, a high frequency controlled
on-time single output dual phase synchronous step-down DC/DC
controller that can achieve up to 92% efficiency with a 25A
output when operating at 2MHz. The operating frequency is
selectable from 200kHz to 2MHz or can be synchronized to an
external clock. A low 30ns minimum on-time allows for a high
step-down ratio at very high operating frequencies. The
controlled on-time, valley current-mode architecture and
Detect Transient Release feature provide a very fast
transient response by increasing operating frequency during a
transient event, enabling the output voltage to recover in
only a few clock cycles. Up to 12
phases can be paralleled and clocked out of phase for high
current applications (up to 250A).
The LTC3839 operates over a 4.5V to 38V input voltage range,
encompassing a wide variety of applications including most
intermediate bus voltages. Strong onboard N-channel MOSFET
gate drivers allow the use of high power external MOSFETs for
output currents up to
50A, at output voltages ranging from 0.6V to 5.5V, making the
device ideal for point-of-load requirements. The LTC3839's
differential amplifier provides true remote output voltage
sensing of both the positive and negative terminals, enabling
high accuracy regulation independent of PCB IR losses (up to
±500mV). The output current is monitored by sensing the
voltage drop across the output inductor (DCR) for highest
efficiency or by using a sense resistor for extra precision.
Additional features include an onboard bias voltage LDO,
soft-start or tracking, adjustable current limit, overvoltage
protection, current limit foldback and external
VCC control.
The LTC3839 offers superior total regulation accuracy and is
specified to account for all
error
sources including line, load and differential sensing. The
LTC3839 total output voltage accuracy is +/-0.25% at 25°C,
+/-0.67% from 0ºC to 85ºC, and ±1% maximum DC error over the
full -40°C to 125°C operating junction temperature range. The
LTC3839 is available in a thermally enhanced 5mm x 5mm QFN-32
package. The 1,000-piece price starts at $3.18 each. For more
information, visit www.linear.com/product/LTC3839
Synchronous Step-Down DC/DC Controller Delivers page 2
Up to 95% Efficiency with 2MHz Operating Frequency
Photo Caption: High Frequency/High Efficiency Step-Down DC/DC Controller Summary of Features: LTC3839? Controlled On-Time, Valley Current-Mode Control for Very Fast Transient Response
? Programmable Operating Frequency from 200kHz to 2MHz, Synchronizable to an External Clock
? Wide VIN Range: 4.5V to 38V
? VOUT Range: 0.6V to 5.5V
? Up to 50A Output Current
? High Step-Down Ratio: 30ns Minimum On-Time
? Up to 12 Phase Operation
? Detect Transient Release Feature
? Differential Amplifier for Remote Output Voltage Sensing
? ±0.67% Output Voltage Accuracy over Temperature
? RSENSE or DCR Current Sensing
? Output Voltage Tracking or Programmable Soft Start
? Adjustable Current Limit
? Overvoltage Protection
? Foldback Current Limit
About Linear Technology
Linear Technology Corporation, a member of the S&P 500, has
been designing, manufacturing and marketing a broad line of
high performance analog integrated circuits for major
companies worldwide for three decades. The Company's products
provide an essential bridge between our analog world and the
digital electronics in communications, networking,
industrial, automotive, computer, medical, instrumentation,
consumer, and military and aerospace systems. Linear
Technology produces power management, data conversion, signal
conditioning, RF and interface
ICs, and µModule® subsystems.
LT, LTC, LTM, µModule and are registered trademarks of Linear Technology Corp. All other trademarks are the property of their respective owners.
Press Contacts: North America / Worldwide UK & NordicJohn Hamburger, Director Marketing Alan Timmins Communications alan@ezwire.com jhamburger@linear.comTel: +44-1-252-629937
Tel: 408-432-1900 ext 2419
Doug Dickinson, Media Relations Manager ddickinson@linear.com
Tel: 408-432-1900 ext 2233
distribué par | Ce noodl a été diffusé par Linear Technology Corporation et initialement mise en ligne sur le site http://www.linear.com. La version originale est disponible ici. Ce noodl a été distribué par noodls dans son format d'origine et sans modification sur 2012-01-17 22:49:09 PM et restera accessible depuis ce lien permanent. Cette annonce est protégée par les règles du droit d'auteur et toute autre loi applicable, et son propriétaire est seul responsable de sa véracité et de son originalité. |
Documents associés | |
Synchronous Step-Down DC/DC Controller Delivers Up to 95% Efficiency with 2MHz Operating Frequency |