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
Are you worth insuring? Wearables to decide
January 30, 2015
At Cicor's first Innovation Insights Symposium held in Zurich end of January, the focus was very much on smart wearables ...
Security flaw in BMW's ConnectedDrive detected
SMBus Version 3.0 offers improved power management performance
Quantum entanglement now on-a-chip
Single crystal perovskites promise cheaper solar cells and LEDs
Wafer-scale perovskite solar cells on the horizon
January 30, 2015
Researchers from the Los Alamos National Laboratory have revealed a solution-based hot-casting technique that allows growth ...
Spread Spectrum Frequency Modulation Reduces Automotive LED Driver EMI
Privately-owned car not on the red list, study says
Private equity buys Canadian MEMS foundry
- Accelerate SDN and NFV with Off-the-Shelf Software
- Sensing Elements for Current Measurements
- Investigating Die attach Failure in IGBTs using Power Cycling Tests
- Power Semiconductor Failure Diagnosis using Thermal Characterization and Power Cycling
InterviewCEO interview: Bosch's IoT startup is all about the system
Thorsten Mueller, CEO of Bosch Connected Devices and Solutions GmbH (Reutlingen, Germany), has been guiding the latest startup subsidiary of Robert Bosch GmbH since 2013 when he started the initiative ...
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
To ensure you have a good start in 2015, Freescale is giving away five of its QorIQ TWR-LS1021A Tower system modules, worth USD269 each, for EETimes Europe's readers to win.
The module is the most feature-rich and high-performance Tower system offered by Freescale, enabling compatibility and interoperability with the growing list of Tower expansion modules, offering an easily accessible...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.