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.
Europe leads world in chip market growth
September 02, 2014
In July the European region showed the strongest year-on-year growth of all regions tracked by the World Semiconductor Trade ...
Radar-based blind spot assist to eliminate collisions during turning
German company wins bid to crash cars in China
European semiconductors sales up 14.9% this year
EE Times' annual salary & opinion survey report
Toshiba announces image sensor strategy
September 01, 2014
Toshiba Corp. has issued a press release detailing its strategy for the image sensor market.
DelfMEMS promotes CFO to CEO
Sensata to pay $1-bn for tire pressure sensor leader
ADCs for high dynamic range – successive-approximation or sigma-delta?
- Power Modules: The New Super Power
- Flexible Performance for Network Security Appliances
- Digital Power Management Reduces Energy Costs While Improving System Performance
- Using RF Recording Techniques to Resolve Interference Problems
InterviewA question of Europe
Sir Peter Bonfield sits on the board and has advisory roles in many international companies and universities. With more than 45 years of experience in electronics, computers and communications, here he ...
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, Trinamic Motion Control is offering you to win one of four TMCM-1043 development kits for its highly integrated, NEMA 17-compatible TMCM-1043 stepDancer stepper motor module.
Offering designers an easy-to-use PC-based GUI that allows one-click modification of motor drive current, micro-stepping and other key parameters, the intuitive kits are custom designed and developed for...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.