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Voltage Regulator is used for DDR/QDR memory termination.

May 6, 2005 - Offered in 4 x 4 mm QFN and SSOP-24 packages, LTC3776 employs no RSENSE, constant frequency current mode architecture. This 2-phase, dual-output, synchronous step-down switching controller operates from 2.75–9.8 V input and features programmable switching frequency up to 750 kHz. Second output (VTT) regulates output voltage to 1/2 of VREF, while providing symmetrical source and sink output current capability. True PLL is offered for frequency locking or adjustment.

Related categories: Controls and Controllers | Electronic Components and Devices

Archive Press Release
(Products mentioned in this Archive Press Release may or may not be available from the manufacturer.)

Release date: April 14, 2005

Dual, 2-Phase No RSENSE Synchronous Controller for DDR/QDR Memory Termination in a 4mm x 4mm QFN

MILPITAS, CA – April 14, 2005 – Linear Technology Corporation announces the LTC3776, a 2-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 1/2 of VREF (usually VDDQ) while providing symmetrical source and sink output current capability. The LTC3776 operates from input range of 2.75V 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 minimized 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 synchronized from 250kHz 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 over voltage protection.

The LTC3776EUF and LTC3776EGN are both available from stock in 4mm x 4mm QFN-24 and SSOP-24 packages, respectively. Pricing starts at $3.75 each for both the LTC3776EUF and the LTC3776EGN, in 1,000-piece quantities.

Summary of Features: LTC3776

• No Current Sense Resistors Required

• Out-of-Phase Controllers Reduce Required Input Capacitance

• VOUT2 Tracks 1/2 VREF

• Symmetrical Source/Sink Output Current Capability (VOUT2)

• Spread Spectrum Operation (When Enabled)

• Wide VIN Range: 2.75V to 9.8V

• Constant Frequency Current Mode Operation

• 0.6V ±1.5% Voltage Reference (VOUT1)

• Low Dropout Operation: 100% Duty Cycle

• True PLL for Frequency Locking or Adjustment

COMPANY BACKGROUND: Linear Technology Corporation was founded in 1981 as a manufacturer of high performance linear integrated circuits. Linear Technology products include high performance amplifiers, comparators, voltage references, monolithic filters, linear regulators, DC-DC converters, battery chargers, data converters, communications interface circuits, RF signal conditioning circuits, and many other analog functions. Applications for Linear Technology’s high performance circuits include telecommunications, cellular telephones, networking products such as optical switches, notebook and desktop computers, computer peripherals, video/multimedia, industrial instrumentation, security monitoring devices, high-end consumer products such as digital cameras and MP3 players, complex medical devices, automotive electronics, factory automation, process control, and military and space systems.

For more information, contact:

Doug Dickinson, Media Relations Manager

Linear Technology Corporation

1630 McCarthy Boulevard

Milpitas, CA 95035-7417

ddickinson@linear.com

408-432-1900

Note: LT, LTC and are registered trademarks of Linear Technology Corp.

Contacts:

Marketing:
Doug Dickinson Media Relations Manager
USA
Phone: 408-432-1900 ext 2233

E-mail this person

Company Information:
Name: Linear Technology Corp.
Address: 1630 McCarthy Blvd.
City: Milpitas
State: CA
ZIP: 95035-7417
Country: USA
Phone: 408-432-1900
FAX: 408-434-6441
http://www.linear-tech.com

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