Quad 1A step-down switching regulator with 100% duty cycle operation
July 09, 2012 // Christoph Hammerschmidt
Linear Technology Corporation has announced the LT3504, a quad 1 A output, 40 V step-down switching regulator with 100% duty cycle operation. The LT3504's 3.2 V to 40 V input voltage range makes it ideal for automotive and industrial applications that require multiple outputs.
Its internal 1.5 A switches can deliver up to 1 A of continuous output current per channel to voltages as low as 0.8 V. The LT3504's unique design includes an onboard boost regulator, enabling each channel to operate at 100% duty cycle, even with input voltage as low as 3.2 V. This architecture makes the LT3504 well suited for applications requiring continuous output regulation, such as automotive cold-crank and stop-start scenarios.
Switching frequency is user-programmable from 250 kHz to 2.2 MHz and synchronizable throughout the range, enabling the designer to optimize efficiency while avoiding critical noise-sensitive frequency bands. The combination of its 28-lead 4-mm x 5-mm QFN and high switching frequency keeps external inductors and capacitors small, providing a compact, thermally efficient footprint for multiple output applications.
The LT3504 utilizes four internal 1.5 A switches for the step-down conversion and a 220 mA switch for the internal boost circuit, with the necessary oscillator, control and logic circuitry integrated into a single die. Special design techniques and a new high voltage process deliver efficiencies up to 88% over a wide input voltage range, while the LT3504's current mode topology enables fast transient response and excellent loop stability. Anti-phase switching reduces input ripple and robust short-circuit protection enhances system reliability. Other features include output voltage tracking, programmable undervoltage lockout and a power good pin to indicate when all outputs are in regulation.
The LT3504EUFD is packaged in a 4-mm x 5-mm QFN-28, priced starting at $3.50 each for 1,000-piece quantities. The LT3504IUFD is tested and guaranteed to operate from a -40°C to 125°C operating junction temperature and is priced at $3.85 each in 1,000-piece quantities. Both versions are available from stock.
Extensible CPU cores exploit IoT's vast potential
May 22, 2015
Cisco Systems has predicted that by 2020, there will be 50 billion “things” connected to the Internet up from 15 billion ...
Audi connects to Baidu, Huawei at CES Asia
New class of magnets attract energy harvesting attention
Sony raises image sensor capex...again
OneSpin Solutions takes formal verification to the App store
Why the speculations on Nokia’s map service HERE run hot
May 21, 2015
Nokia’s digital map service HERE is on the block – and a crowd of suitors are outbidding each other. But some remain at the ...
Flexible OLED display peels off the wall
Irish battery R&D facility targets advanced material development
Bosch adjusts course for future mobility requirements
- Integrating GPS into consumer products
- Controlling LED Lighting Using Triacs and Quadracs
- Automotive Designs Demand Low EMI Synchronous Buck Converters
- Smart Capacitive Design Tips
InterviewCEO interview: What's next after Tower's turn-around?
May 2015 marks the tenth anniversary of Russell Ellwanger taking over as CEO of speciality foundry Tower Semiconductor Ltd. (Migdael Haemek, Israel), which now trades as TowerJazz. And so EE Times Europe ...
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
In this month's reader offer, Analog Devices is giving away five Blackfin Low-Power Imaging Platform (BLIP) Development Systems (ADZS-BF707-BLIP2), worth 199 dollars each, for EETimes Europe's readers to win.
Targeting demanding ultra-low-power, real-time applications for image sensing and advanced audio, the development platform leverages the company’s ADSP-BF707BBCZ-4 Blackfin processor as...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.