Product category:
Power Supply ICs and Controllers
News Release from: Linear Technology Corp | Subject: LT3845
Edited by the Electronicstalk Editorial
Team on 17 May 2007
Power controller trades off size and
efficiency
Wide-input-range synchronous DC/DC step-down controller features adjustable 100 to 500kHz operating frequency.
Available immediately from Linear Technology, the LT3845 is a 4 to 60V input, synchronous DC/DC step-down controller with adjustable 100 to 500kHz operating frequency At higher frequencies users can implement a smaller inductor and capacitors, or at lower frequencies they can optimise the efficiency of the circuit
This article was originally published on Electronicstalk on 28 Jul 2004 at 8.00am (UK)
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For noise- sensitive applications, the LT3845 can be synchronised to an external clock from 100kHz to 600kHz.
The minimum 4V input maintains operation during automotive cold cranking and the 60V maximum input withstands inductive load dump peak voltages.
In addition, the output voltage can be adjusted over a wide range from 1.23 to 36V at load currents up to 20A.
Applications include 12 and 42V automotive, 48V telecomms supplies, heavy equipment systems, avionics, industrial controls and distributed power systems.
The LT3845 is a current mode controller with an integrated biasing regulator that drives N-channel MOSFETs.
Current mode operation provides fast line and load transient response, as well as cycle-by-cycle overcurrent protection.
The integrated regulator provides IC power directly from the input supply without the need for a separate bias voltage.
It maintains high efficiency at light loads with its Burst Mode operation and 120uA quiescent current, a feature required in many automotive and battery-supplied input applications.
Other features include short-circuit protection, adjustable soft-start, thermal shutdown and precision input undervoltage lockout.
The LT3845 employs adaptive overlap control, which maintains a constant dead time, preventing shoot-through switch currents, independent of the type, sise or operating conditions of the external MOSFET switches.
The LT3845 is offered in a 16-pin thermally enhanced TSSOP package and is rated for operation from -40 to +125C.
The 1000-piece price starts at US $3.56. Request a free brochure from Linear Technology Corp ...
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