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
Autonomous taxis would be green and cost effective says study
July 06, 2015
A new study from Lawrence Berkeley National Laboratory (Berkeley Lab) finds that autonomous cars deployed as taxis would ...
What she sees is what you get
Prototyping in silicon photonics boosted by European collaboration
Private equity makes moves on GaN startup
TSMC overtakes Intel in chip capex ranking
3D fingerprint scanner beats Apple's
July 06, 2015
Password security is already becoming a thing of the past with biometrics taking their place. For instance, fingerprint identification ...
Solar powered flight smashes long distance records
Electric double-decker buses lead London's zero emission drive
Another kind of SUV: High agility at zero local emissions
- Critical Requirements in High Speed Signal Generation Applications
- The 400XAC Series: Two Major Advantages that Simplify Functional Testing
- A Smart Way to Drive ECU Consolidation
- Autonomous Driving: An Eye on the Road Ahead
InterviewCEO interview: Cadence is about enablement, collaboration
EDA companies are being asked to provide expertise from the circuit- to the system-level observes Lip-Bu Tan, CEO of EDA software vendor Cadence Design Systems Inc. Covering such a breadth of endeavour ...
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, Novelda is giving away two full XeThru Inspiration kits worth 1499 US Dollars each, for EETimes Europe's readers to experiment first hand with its XeThru technology.Based on the use of radio waves, rather than infrared, ultrasound or light, the company's X2M1000 Inspiration modules can detect presence just from the chest movement while breathing, and measure both the rate and... 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.