Synchronous step-down regulator features input and output current limiting and current monitoring
July 20, 2012 // Paul Buckley
Linear Technology has introduced a high efficiency, 3 MHz synchronous buck regulator that offers both input and output current limiting and monitoring.
The LTC3626 incorporates a constant frequency/controlled on-time, current-mode architecture that delivers up to 2.5 A of continuous output current at output voltages as low as 0.6V from a 3 mm x 4 mm QFN package.
The device's current-mode operation offers excellent line and load transient response even with high step-down ratios. The LTC3626 operates from an input voltage range of 3.6 V to 20 V, making it suitable for a wide range of applications, including dual/multiple-cell Li-Ion battery stacks and 5 V to 18 V intermediate bus systems. Its average input current and output current limiting are pin-programmable, making it well suited for applications such as USB power. The LTC3626’s switching frequency is user programmable and synchronizable from 500 kHz to 3 MHz, enabling the use oflow cost capacitors and inductors.
The LTC3626 uses internal switches with RDS(ON) of 11 5mOhms and 70 mOhms to deliver efficiencies as high as 95%. Its unique control architecture enables it to achieve duty cycles as low as 5%, while maintaining switching frequencies up to 2.25 MHz, making it ideal for high step-down ratio applications, such as 12 VIN to 1.2 VOUT conversions. Burst Mode operation is used to maximize light load efficiency, requiring only 300 µA (at no load), important for applications demanding maximum battery run time.
For applications requiring the lowest possible noise, the LTC3626 can be configured to run in forced continuous mode, for minimum noise and potential RF interference. Furthermore, an internal die temperature monitor provides a voltage proportional to temperature which can be programmed to limit maximum die temperatures.
Additional features include a power good voltage monitor, output voltage tracking capability and short circuit protection.
Availability and Pricing
The LTC3626EUDC is available in a 3 mm x 4 mm QFN-20. Pricing starts at $3.45 each in 1,000-piece quantities. An industrial grade version, the LTC3626IUDC offers guaranteed performance over the -40 to 125°C operating junction temperature range, priced at $3.97 each in 1,000-piece quantities. Both versions are available from stock.
More information about the LTC3626 synchronous buck regulator visit www.linear.com/product/LTC3626
Oscilloscope engine plugs into portable Apple products
September 30, 2014
This month, Oscium is giving away three of its iMSO-204L dual analogue iOS oscilloscopes, worth USD400 each. Designed with ...
BMW joins forces with Baidu for automated driving
Self-tuning acoustic-ready chip increases audio focus
16nm FinFETs boost ARM's 64-bit big.LITTLE
X-ray imaging reveals path to extending battery lifetimes
Electron innovation prolongs power in mobile devices
September 30, 2014
Researchers from The University of Texas at Dallas have created technology that could be the first step toward wearable computers ...
What Is Digital Power System Management?
Qualcomm increases share of smartphone processor market
Aggregating disparate data protocols from IoT
- Solutions for Millimeter Wave Wireless Backhaul
- Enter Linduino
- A Novel Approach to Industrial Rectifier Systems
- Putting FPGAs to Work in Software Radio Systems Handbook
InterviewCEO interview: AMS' Laney on driving a sensor-driven business
Kirk Laney, CEO of Austrian mixed-signal chip and sensor company AMS, wants to leverage the opportunity that technology affords to create new markets for sensors and sensor interfaces.
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, Oscium is giving away three of its iMSO-204L dual analogue iOS oscilloscopes, worth USD400 each. Designed with native Lightning compatibility, the iMSO-204L transforms the iPad, iPhone, and iPod touch into an ultra-portable, two-channel oscilloscope.
Since Apple changed its connector, Oscium has been working to bring native compatibility to its customers. The third generation...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.