20-V synchronous buck controller drives high-current point-of-load applications
July 06, 2010 // Paul Buckley
National Semiconductor Corp. has unveiled a new synchronous voltage-mode buck controller that drives a variety of high-current point-of-load applications in printers, telecom, networking and embedded computing applications.
A new addition to National's PowerWise energy-efficient product family, the LM27402's advanced features make it the industry's most feature-rich 20 V synchronous buck controller. Until today, point-of-load controllers have incorporated one or two complex features, such as a wide input voltage range, integrated high-current gate drivers with adaptive dead-time, inductor DCR current sensing or on-chip bias supply sub-regulator. National's LM27402, however, is the first universal point-of-load controller to integrate all these advanced features into a single chip - key features required for many types of DC-DC applications.
A wide input voltage range of 3 V to 20 V allows the LM27402 to interface with all intermediate bus voltages, including 3.3 V, 5.0 V and 12 V rails. Integrated inductor DC resistance current sense eliminates the need for resistive power train elements to detect output current. This increases overall power conversion efficiency and allows accurate continuous current limit sensing. The current sense threshold level is programmable to accommodate a wide range of load current levels using the smallest inductor possible.
Output voltage is adjustable down to 0.6 V with a one percent voltage reference providing output voltage set-point accuracy over the full -40 to 125 degrees C operating temperature range. An integrated bias supply sub-regulator eliminates the external bias voltage supply to simplify PC board layout. Integrated, high-current MOSFET gate drivers with adaptive dead-time control enable ultra-efficient power conversion with load currents as high as 30 A. It also supports programmable soft-start, tracking and pre-biased startup.
Offered in 16-pin thermally enhanced TSSOP and 4 mm by 4 mm LLP packages, the LM27402 is available for design on National's WEBENCH Power Designer.
Availability and Pricing
Available now, National's LM27402 is priced at 1.68 US Dollars in 1,000-unit quantities.
Related link: LM27402
Is 3D XPoint based on phase-change memory?
July 31, 2015
What would be the simplest way to explain the technology behind 3D XPoint non-volatile memory; a scaled version of phase-change ...
Google Glass refocuses on enterprises, circumvents privacy issues
IoT wireless sensors and the problem of short battery life
High speed DAC for wide bandwidth signal generation
IBM's Watson to help CVS manage patient health data
3D printing as seen by the engineering community
July 30, 2015
Distributor RS Components has conducted some research over the past 12 months to understand what engineers and consumers ...
Green mobility, automation drive power electronics market
Sol-gel capacitor dielectric achieves record energy storage
Filament bulb replacements: The GaN-on-Silicon LED solution arrives
- Dual Phase Buck Controller Drives High Density 1.2V/60A Supply with Submilliohm DCR Sensing
- Test environment for the positioning elements of wearable devices
- Automotive Circuit Protection using Littelfuse Automotive TVS Diodes
- Top 5 Challenges for testing Today's Consumer Electronics
InterviewGlobalfoundries' CEO on why FD-SOI and why now
With its latest news Globalfoundries Inc. has not only confirmed itself as a supporter of the fully-depleted silicon-on-insulator (FD-SOI) approach to IC manufacturing but that it also thinks sufficiently ...
Filter WizardCheck out the Filter Wizard Series of articles by Filter Guru Kendall Castor-Perry which provide invaluable practical Analog Design guidelines.
Linear video channel
READER OFFERRead more
This month, Novelda is giving away two full XeThru Inspiration kits worth 1499 US Dollars each, for EETimes Europe's readers to experiment first hand with its XeThru technology.Based on the use of radio waves, rather than infrared, ultrasound or light, the company's X2M1000 Inspiration modules can detect presence just from the chest movement while breathing, and measure both the rate and... MORE INFO AND LAST MONTH' WINNERS...
December 15, 2011 | Texas instruments | 222901974
Unique Ser/Des technology supports encrypted video and audio content with full duplex bi-directional control channel over a single wire interface.