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
Growing the seeds of electronics on the "radio"
September 02, 2015
I am looking forward to an EE Times "radio show" I am moderating next week on the topic of startups, but I could do with ...
Analog Devices is Sand 9 buyer
Butterfly wings inspire gas sensing innovation
SEMI Europe appoints new president
Will hardware-based virtualized GPU cards shrink the market?
Plessey clinches GBP6.7m grant for LED production expansion
September 01, 2015
Plessey has received a grant of Ł6.7 million the Regional Growth Fund (RGF) in the UK to help fund the expansion of the company's ...
Fraunhofer develops cost-effective wireless charging system
Grab Altera's latest MAX 10 FPGA kit
Smart mouth guard monitors health markers in real time
- High Voltage CMOS Amplifier Enables High Impedance Sensing with a Single IC
- Software-Defined Radio Handbook
- Why Making the Move from a Variable Transformer to a VariPLUS is the Right Decision
- Automating Leakage and Functional Testing
InterviewCEO interview: Ambiq sees broader options for low voltage
Mike Noonen, recently appointed interim CEO at microcontroller startup Ambiq Micro, discusses the focus and opportunities for this pioneering company designing circuits that can operate below the threshold ...
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, Altera is giving away three of its second-generation Nios II Embedded Evaluation Kit (NEEK), worth 9 each, for EETimes Europe's readers to win.
The feature-rich platform provides a fast and simple way for embedded designers to experience the capabilities of a custom embedded processor in a non-volatile FPGA.
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.