Tag Archives: Buck

Buck regulator accepts 3.0-V to 42-V input

8608

Linear Technology Corporation announces the LT8608, a 1.5A, 42V input synchronous step-down switching regulator. A unique synchronous rectification topology delivers 93% efficiency while switching at 2MHz enabling designers to avoid critical noise-sensitive frequency bands, such as AM radio, while using a very compact solution footprint. Burst Mode® operation keeps quiescent current under 2.5μA in no-load standby conditions making it ideal for always-on systems. Its 3.0V to 42V input voltage range makes it ideal for automotive applications which must regulate through cold-crank and stop-start scenarios with minimum input voltages as low as 3.0V and load dump transients in excess of 40V. Its internal 2A switches can deliver up to 1.5A of continuous output current. The LT8608 maintains a minimum dropout voltage of only 200mV (@500mA) under all conditions, enabling it to excel in scenarios such as automotive cold-crank. Spread spectrum frequency modulation and special design techniques offer low EMI operation to minimize noise concerns in automotive and industrial environments. Furthermore, a fast minimum on-time of only 45ns enables 2MHz constant frequency switching from a 16V input to a 1.5V output. The LT8608’s 10-lead thermally enhanced MSOP package and high switching frequency keeps external inductors and capacitors small, providing a compact, thermally efficient footprint.

Buck regulator accepts 3.0-V to 42-V input – [Link]

LTC7813 – IC cascades boost/buck controllers

7813

Linear Technology Corporation introduces the LTC7813, a dual output (boost + buck), low quiescent current synchronous DC/DC controller. When cascaded, its independent step-up (boost) and step-down (buck) controllers regulate the output voltage from an input voltage that can be above, below, or equal to the output voltage, including during an automotive load dump or cold crank. Unlike conventional single inductor buck-boost regulators, the LTC7813’s cascaded boost + buck solution provides fast transient response with continuous, non-pulsating input and output currents. It substantially reduces ripple voltage and EMI, ideal for automotive, industrial and high power battery operated systems.

LTC7813 – IC cascades boost/buck controllers – [Link]

Basic Switching Voltage Regulator Tutorial

AO18-Banner-01-760x443

James Lewis @ baldengineer.com discuss about switching regulator types and uses.

A switching voltage regulator is one of my favorite circuits. In school, they were the first circuits I built where I understood how transistors worked. In fact, they were the first circuit I saw an inductor being useful! Switching regulators are incredibly efficient when designed properly. Of course, this detail about design is important.

Basic Switching Voltage Regulator Tutorial – [Link]

LTC7813 – Low IQ, 60V Synchronous Boost+Buck Controller

7813

Linear Technology Corporation introduces the LTC7813, a dual output (boost + buck), low quiescent current synchronous DC/DC controller. When cascaded, its independent step-up (boost) and step-down (buck) controllers regulate the output voltage from an input voltage that can be above, below, or equal to the output voltage, including during an automotive load dump or cold crank. Unlike conventional single inductor buck-boost regulators, the LTC7813’s cascaded boost + buck solution provides fast transient response with continuous, non-pulsating input and output currents. It substantially reduces ripple voltage and EMI, ideal for automotive, industrial and high power battery operated systems.

LTC7813 – Low IQ, 60V Synchronous Boost+Buck Controller – [Link]

LTC3106 – 300mA Low Voltage Buck-Boost Converter with PowerPath

3106

Linear Technology announces the LTC3106, a highly integrated, 1.6µA quiescent current 300mV start-up buck-boost DC/DC converter with PowerPath™ management, optimized for multisource, low power systems. The LTC3106 is ideal for powering low power wireless sensors from rechargeable or primary batteries supplemented by energy harvesting. The LTC3106 incorporates maximum power point control (MPPC) making it compatible with common high impedance power sources, including photovoltaic cells, thermoelectric generators (TEGs) and fuel cells.

LTC3106 – 300mA Low Voltage Buck-Boost Converter with PowerPath – [Link]

LTC3106 – 300mA Low Voltage Buck-Boost Converter

3106

The LTC3106 is a highly integrated, 1.6μA quiescent current 300mV startup buck-boost DC/DC converter with PowerPath management, optimized for multisource, low power systems. The LTC3106 is ideal for powering low power wireless sensors from rechargeable or primary batteries supplemented by energy harvesting. If the primary power source is unavailable, the LTC3106 seamlessly switches to the backup power source. The LTC3106 is compatible with either rechargeable or primary cell batteries and can trickle charge a backup battery whenever there is an energy surplus available.The LTC3106 provides 300mA steady state and 650mA peak load current at up to 92% efficiency.

LTC3106 – 300mA Low Voltage Buck-Boost Converter – [Link]

Single Regulator contains buck and boost controllers

7812

Linear Technology Corporation introduces the LTC7812, a dual output (boost + buck), low quiescent current synchronous DC/DC controller. When cascaded, its independent step-up (boost) and step-down (buck) controllers regulate the output voltage from an input voltage that can be above, below or equal to the output voltage, maintaining output regulation during cold crank and load dump conditions. Unlike conventional single inductor buck-boost regulators, the LTC7812’s cascaded boost + buck solution provides fast transient response with continuous, non-pulsating, input and output currents, substantially reducing ripple voltage and electromagnetic interference (EMI), making it ideal for automotive, industrial and high power battery operated systems.

Single Regulator contains buck and boost controllers – [Link]

SOS webinar – Simple and efficient solution for wide voltage range applications

image_gallery

LINEAR TECHNOLOGY
Term: 2015.11.25 10:00 – 11:30 CET

Learn more about available topologies for input voltage higher and lower from output level. Focus on the most efficient way to convert power in four-switch buck-boost topology.

  • available topologies of Vin min < Vout < Vin max and differences between them
  • four-switch buck-boost topology as the most efficient, flexible and the smallest solution
  • buck-boost solutions from Linear Technology, applied to real end-devices
  • Diskusia

SOS webinar – Simple and efficient solution for wide voltage range applications – [Link]

How to control LM2596 buck-converter with microcontroller

by hugatry @ hackvlog.com:

Every now and then someone asks on different forums if there is an way to control cheap LM2596 modules with an Arduino or another microcontroller. I decided to demonstrate one solution that might be basic electronics for some, but still many don’t know about.

Those buck converters will change the output voltage to make the feedback pin, connected to the output via a voltage divider, become 1.25V or so. If feedback is higher, output gets lower and vice versa. If one changes the ratio of resistors in voltage divider, output voltage will change. This is usually done by turning a trimmer resistor with a screwdriver. That is good enough for many applications where voltage will be set only once, but sometimes there is a need to adjust the output voltage more frequently.

How to control LM2596 buck-converter with microcontroller – [Link]

Buck-boost regulator achieves high efficiency

226094

by Susan Nordyk @ edn.com:

Using adaptive current-limit PFM (pulse frequency modulation) control, the ISL9120 switching regulator from Intersil realizes efficiencies of up to 98%, while automatically transitioning between buck and boost modes without significant output disturbance. The part accommodates a wide input voltage range of 1.8 V to 5.5 V and has an adjustable output voltage range of 1 V to 5.2 V for use with multiple power rails. It is capable of delivering up to 800 mA of output current (VIN = 2.5 V, VOUT = 3.3 V).

Buck-boost regulator achieves high efficiency – [Link]