Product category: Power Supply ICs and Controllers
News Release from: Linear Technology Corp | Subject: LTC3776
Edited by the Electronicstalk Editorial Team on 14 July 2005
Dual output regulator takes care of
memories
The LTC3776 is a two-phase, dual output synchronous step-down switching regulator controller for DDR/QDR memory termination applications.
Linear Technology has released the LTC3776, a two-phase, dual output synchronous step-down switching regulator controller for DDR/QDR memory termination applications The second output of the controller (VTT) regulates its output voltage to half of VREF (usually VDDQ) while providing symmetrical source and sink output current capability
This article was originally published on Electronicstalk on 28 Jul 2004 at 8.00am (UK)
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The LTC3776 operates from input range of 2.75 to 9.8V, enabling it to operate from 3.3V input rails without any external biasing.
A no-Rsense constant-frequency current-mode architecture eliminates the need for sense resistors while improving efficiency.
Power losses and switching noise due to input capacitance ESR are minimised by operating the two controllers out of phase.
The LTC3776's switching frequency can be programmed up to 750kHz, enabling the use of small, surface mount inductors and capacitors.
For noise sensitive applications, the LTC3776's switching frequency can be externally synchronised from 250 to 850kHz with phase-lock-loop circuitry, or spread spectrum operation an be enabled.
Forced continuous operation also reduces noise and RF interference.
Soft-start for VDDQ is provided internally and can be extended using an external capacitor.
Other features include: low dropout 100% duty cycle operation, a power good output voltage monitor and output overvoltage protection.
The LTC3776EUF and LTC3776EGN are both available from stock in 4 x 4mm QFN-24 and SSOP-24 packages, respectively.
Pricing starts at $3.75 each for both the LTC3776EUF and the LTC3776EGN, in 1000-piece quantities. Request a free brochure from Linear Technology Corp ...
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