2-MHz step-down DC/DC converters only require 2.7 ľA of quiescent current
July 19, 2012 // Paul Buckley
Linear Technology Corporation has introduced the LT3975, a 42 V step-down switching regulator that can deliver 2.5 A of continuous output current and requires only 2.7 ľA of quiescent current.
Similarly, the LT3976 can operate from a 40 V input, delivers up to 5 A of output current and requires 3.3 µA of quiescent current. Both devices offer a 4.2 V to a nominal 40 V input voltage range, making them ideal for automotive and industrial applications. Their internal high 75mOhm switches deliver efficiencies as high as 90%. The LT3975’s and LT3976’s Burst Mode operation offers ultralow quiescent current, a feature that is also well suited for automotive and industrial systems applications that demand always-on operation and optimum battery life.
The devices’ design maintains a minimum dropout voltage of 500 mV when the input voltage drops below the programmed output voltage, a functional necessity in applications subject to automotive cold-crank conditions. Switching frequency is user-programmable from 200 kHz to 2 MHz, and synchronizable from 250kHz to 2MHz, enabling the designer to optimize efficiency while avoiding critical noise-sensitive frequency bands. The combination of their 16-lead thermally enhanced MSOP package and high switching frequency keeps external inductors and capacitors small, providing a compact, thermally efficient footprint.
The LT3975 and LT3976 use a high efficiency 75 mOhm switch, with the boost diode, oscillator, control and logic circuitry integrated into a single die. Low ripple Burst Mode operation maintains high efficiency at low output currents while keeping output ripple below 15 mVPK-PK. Special design techniques and a new high voltage process deliver high efficiency over a wide input voltage range, and their current-mode topology enables fast transient response and excellent loop stability. Other features include a power good flag, soft-start capability and thermal protection.
Availability and Pricing
The LT3975EMSE and the LT3976EMSE are packaged in a thermally enhanced MSOP-16, priced starting at $3.10 and $3.75 each, respectively for 1,000-piece quantities. The LT3975IMSE and LT3976IMSE are tested and guaranteed to operate from a -40 to 125°C operating junction temperature and are priced at $3.41 and $4.13 each, respectively in 1,000-piece quantities. The LT3975HMSE and LT3976HMSE are tested and guaranteed to operate from a -40 to 150°C operating junction temperature and are priced at $3.66 and $4.38 each, respectively in 1,000-piece quantities All versions are available from stock.
More information about the LT3975 and LT3976 step-down switching regulators at
www.linear.com/product/LT3975 and www.linear.com/product/LT3976
Low noise rail-to-rail negative regulator with programmable current limit
August 28, 2014
The LTR3090 is a low noise single resistor programmable negative regulator based upon current reference architecture.
Study: Connected Car to spur competition between OEMs and IT players
BAE Systems develops 'smart skin' for aircraft
White-chip scale packages cut costs by 80 percent
Emberlight connects ordinary light bulbs to your smartphone
Cree targets mid-power LEDs with USD83m Lextar investment
August 27, 2014
Cree, Inc. has entered into an agreement with Lextar Electronics Corp., a vertically-integrated LED company from Taiwan, ...
Will 2D semiconductors threaten graphene's PV dominance?
IKEA GreenTech invests in energy-efficient LED technology developer
Searching through big data with the NSA
- How to Protect & Monetize Android Apps
- Building Blocks for the Internet of Things
- New Linear Regulators Solve Old Problems
- Testing GPS with a Simulator
InterviewCEO interview: Tronics' Langlois makes moves in MEMS
Pascal Langlois has been CEO at Tronics for nine months. He discusses plans for the company and directions for the complex and diverse MEMS technology sector.
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, Altium Ltd is offering EETimes Europe's readers the chance to win one TASKING VX-Toolset for ARM Cortex-M Premium Edition, normally licensed for 2.395 Euros, for ultra-rapid prototyping and code development around ARM Cortex-M based microcontrollers.
The VX-toolset for ARM is the first TASKING compiler suite to receive the Software Platform technology, which is seamlessly...Read more
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.