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
Micrel's 10 criteria for choosing a MEMS foundry
April 18, 2014
Micrel Inc. (San Jose, Calif.) has prepared an article that lays out the 10 criteria to help guide someone in the choice ...
Superconducting qbits made immune to quasiparticle energy loss
The Filter Wizard: Just add a transistor
Mobile display revenues soar, leaving TV behind
European organic PV project aims for material gains
Nanomaterial-packed cathode extends range of EV lithium-sulfur batteries
April 17, 2014
Researchers at the USA's Department of Energy Pacific Northwest National Laboratory have developed a metal organic framework ...
Wearable computing market on 78% CAGR through 2018
OLED TV shipment delays stall OLED material growth
BMW updates navigation via mobile radio connection
- USB 5V 2.5A Output, 42V Input Synchronous Buck with Cable Drop Compensation
- Measurement applications across multiple test platforms
- Supplying DC input power to string inverters
- Supplying DC input power for HEV testing
InterviewHeartbleed challenges the Internet of Thing
The Heartbleed security bug is a key example of the fundamental security challenge for the Internet of Things says Green Hills Software as it launches a new security group.
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, Arrow Electronics is giving away ten XMC1200 lighting application kits, worth 100 Euros each, for EETimes Europe's readers to win.
Each kit combines Infineon’s brightness and colour control XMC1200 CPU board to drive flicker free LED dimming and colour changing, together with a colour LED card and a white LED card.
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.