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.
Connected Car: Dramatic growth ahead
January 27, 2015
Already in a few years, the number of connected cars out on the roads will reach a quarter billion. Market research and IT ...
The automation obituaries
TSVs to split more chips: re-integration is the focus
Analog, embedded drive TI upwards in 2014
Maxim exits consumer MEMS, touch sensors
Algorithm indicates the electricity consumption of individual appliances
January 27, 2015
Researchers at Austria's Alpen-Adria-Universität Klagenfurt have developed an algorithm that claims to reveal the electricity ...
Graphene enables electrical control light emitter energy flows
ARM backs printed electronics startup
Infineon takes the lead in auto semiconductors
- Sensing Elements for Current Measurements
- Investigating Die attach Failure in IGBTs using Power Cycling Tests
- Power Semiconductor Failure Diagnosis using Thermal Characterization and Power Cycling
- Top 5 Trends in Product Development and Test Engineering
InterviewCEO interview: Bosch's IoT startup is all about the system
Thorsten Mueller, CEO of Bosch Connected Devices and Solutions GmbH (Reutlingen, Germany), has been guiding the latest startup subsidiary of Robert Bosch GmbH since 2013 when he started the initiative ...
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
To ensure you have a good start in 2015, Freescale is giving away five of its QorIQ TWR-LS1021A Tower system modules, worth USD269 each, for EETimes Europe's readers to win.
The module is the most feature-rich and high-performance Tower system offered by Freescale, enabling compatibility and interoperability with the growing list of Tower expansion modules, offering an easily accessible...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.