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
Cadence breaks into top four in semi IP core ranking
April 23, 2014
Cadence Design Systems Inc. moved into the top four of semiconductor IP core suppliers in 2013 spurred by its renewed IP ...
Get your IT infrastructure assessed for free
Custom processor tool wins $2.8m backing
Mixture of graphene/carbon nanotubes produce low-cost ultracapacitors
OLEDs help NASA focus space biology research
Display Stream Compression standard boosts display interfaces to 8K
April 23, 2014
The Video Electronics Standards Association (VESA), working in liaison with the MIPI Alliance, has unveiled the Display Stream ...
Hard wired floating point changes FPGA
Printoo: printed electronics made Arduino-compatible
Magnetic RAM set for 50% CAGR, says report
- 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.