Analog Devices has introduced the LT8645S to its Power by Linear portfolio, the LT8645S is an 8A, 65V input capable synchronous step-down switching regulator. Its unique Silent Switcher®2 architecture uses two internal input capacitors as well as internal BST and INTVCC capacitors to minimize the area of the hot loops. Combined with very well controlled switching edges and internal construction with an integral ground plane and the use of copper pillars in lieu of bond wires, the LT8645S dramatically reduces EMI/EMC emissions. This improved EMI/EMC performance is not sensitive to board layout, simplifying design and reducing risk even when using two layer PC boards. The LT8645S can easily pass the automotive CISPR25, Class 5 peak EMI limits with a 2MHz switching frequency over its entire load range. Spread spectrum frequency modulation is also available to lower EMI/EMC levels further.
The LT8645S’s synchronous rectification delivers efficiency as high as 94% with a switching frequency of 2MHz. Its 3.4V to 65V input voltage range is ideal for dual cell transportation, 48V automotive and industrial applications. The internal high efficiency switches can deliver up to 8A of continuous output current to voltages as low as 0.97V. The LT8645S’s Burst Mode® operation offers only 2.5µA of quiescent current, well suited for applications such as automotive/transportation always-on systems, which need to extend operating battery life. The LT8645S’s unique design maintains a minimum dropout voltage of only 60mV (at 1A) under all conditions, enabling it to excel in scenarios such as automotive cold-crank. Furthermore, a fast minimum on-time of only 40ns enables 2MHz constant frequency switching from a 24V input to a 2.0V output, enabling designers to optimize efficiency while avoiding critical noise-sensitive frequency bands. The LT8645S’s 32-lead, 4mm × 6mm LQFN package and high switching frequency keeps external inductors and capacitors small, providing a compact, thermally efficient footprint.
The LT8645S utilizes internal top and bottom high efficiency power switches with the necessary boost diode, oscillator, control and logic circuitry integrated into a single die. Low ripple Burst Mode operation maintains high efficiency at low output currents while keeping output ripple below 10mVP-P. For applications requiring the lowest noise operation, the LT8645S can be programmed to run in pulse-skipping mode. Its switching frequency is programmable and synchronizable from 200kHz to 2.2MHz. Special design techniques and a new high speed process enable high efficiency over a wide input voltage range, and the LT8645’s current mode topology enables fast transient response and excellent loop stability. Other features include internal compensation, a power good flag, output soft-start/tracking and thermal protection.
The LT8645SEV is packaged in a 4mm × 6mm LQFN package and is also available in an industrial temperature version, the LT8645SIV, which is tested and guaranteed to operate from a –40°C to 125°C operating junction temperature.
Summary of Features: LT8645S
Analog Devices have also made the DC2468A Demonstration circuit available which allows designers to quickly evaluate the performance of the LT8645S 8A Micropower Synchronous Step-Down Silent Switcher 2 device. The demo board is designed for 5V output from a 5.6V to 65V input, its wide input range allows a variety of input sources, such as automotive batteries and industrial supplies.
Click here for more information or to buy from Anglia Live.
Click here to download the LT8645S Datasheet.
Click here to download the DC2468A manual.
Anglia are offering customers a FREE demo board and samples of the LT8645S 8A synchronous step-down switching regulator from Analog Devices, please fill in the form below to register for your FREE samples now.
FREE samples for UK and Ireland customers only, subject to availability.
The ADMV1013 and ADMV1014 devices from Analog Devices are a paired highly integrated microwave upconverter and downconverter, respectively.
The Power by Linear LTC4126 from Analog Devices expands their offerings in wireless battery charging, the LTC4126 combines a wireless powered battery charger for Li-Ion cells with a high efficiency multi-mode charge pump DC/DC converter.
Analog Devices has expanded its suite of Power by Linear µModule regulators with the introduction of the LTM4700 step-down DC/DC power regulator
Analog Devices has released the Power by Linear™ LTC3310S monolithic synchronous buck converter. The device's fixed frequency peak current mode architecture is ideal for high step-down ratio applications that demand fast transient response.
Analog Devices has released robust industrial Ethernet physical layer (PHY) products to help manufacturers address key Industry 4.0 and smart factory communication challenges.
Analog Devices have a broad range of solutions within its advanced Industry 4.0 roadmap aimed at helping industrial equipment OEMs accelerate their path to Industry 4.0. These new solutions deliver next-generation flexibility, connectivity, and efficiency