Product category: Power Supply ICs and Controllers
News Release from: Linear Technology Corp | Subject: LTC3828
Edited by the Electronicstalk Editorial Team on 08 August 2005
Switching controller takes on system
duties
A dual step-down synchronous switching controller integrates tracking for sequencing multiple voltage rails, a PLL for precision synchronisation and PolyPhase operation for reducing input capacitance.
Linear Technology has introduced the LTC3828, a dual step-down synchronous switching controller with integrated tracking for sequencing multiple voltage rails, phase-locked loop (PLL) for precision synchronisation and PolyPhase operation for reducing input capacitance The LTC3828 has a unique capability to daisychain to multiple LTC3828s or other DC/DC convertors to provide tracking for more than two voltages while operating at three, four or six phases
This article was originally published on Electronicstalk on 28 Jul 2004 at 8.00am (UK)
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The IC has a constant 550kHz frequency current mode architecture and can also be locked to a 260 to 550kHz clock to reduce EMI at sensitive frequencies.
The LTC3828 is used to convert 4.5 to 28V (30V maximum) input voltage to two regulated output voltages, adjustable from 0.8V to as high as 99% of the value of the input voltage.
The LTC3828's wide operating voltage and unique integrated functions enable the design of compact multiple output power supplies in applications such as single-board computers, industrial equipment, automotive electronics and FPGA-based systems.
The LTC3828 uses a constant frequency, current mode all N-channel MOSFET synchronous architecture with the two control channels operating 180 degrees out of phase.
A clock output pin enables synchronisation of multiple controllers.
The IC allows the user to program how the channel outputs ramp up and down.
Both coincident and ratiometric tracking are supported.
Moreover, high current gate drivers allow high power density solutions.
Powering difficult loads such as starting with prebiased outputs, common when power ASICs, is supported by preventing reverse inductor currents and disabling current fold back during start-up.
The LTC3828 is rated for operation from -40 to +85C and is offered in 28-lead SSOP and 5 x 5mm QFN packages.
1000-piece pricing starts at $4.65 each. Request a free brochure from Linear Technology Corp ...
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