DC to DC Power Supplies (Converters)
Bus Termination Controller regulates down to 0.4 V.
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Press Release Summary:
Model LTC3831-1 synchronous, switching DC/DC controller guarantees output voltage regulation of 0.75 V or lower for systems needing active bus termination. Unit generates termination voltage with ±1.6% accuracy and can sink and source as much as 15 A at up to 90% efficiency to satisfy small to large DDR/QDR memory banks. Operating from 3-8 V, device drives 2 external MOSFETs synchronously and eliminates need for current sense resistor.
Original Press Release:
Bus Termination Controller for 0.75V DDR & QDR Memory Delivers High Current at High Efficiency
MILPITAS, CA - April 20, 2004 - Linear Technology Corporation introduces the LTC3831-1, a synchronous switching DC/DC controller that guarantees output voltage regulation of 0.75V or lower for systems needing precision active bus termination for high-speed logic interface. The LTC3831-1 generates the termination voltage with ±1.6% accuracy. Older ICs are limited to 1.25V output while the LTC3831-1 is tested and guaranteed for both 0.75V and 1.25V. If required, this DC/DC controller is can also provide even lower output voltages down to 0.4V. The LTC3831-1 can sink and source as much as 15A at up to 90% efficiency to satisfy small to large DDR/QDR memory banks. The IC drives two external MOSFETs synchronously and eliminates the need for a current sense resistor, which improves operating efficiency especially at high output currents. Applications for the LTC3831-1 include systems using DDR, DDR-II, QDR, and QDRII memory as well any other systems using high-speed logic interface such as SSTL-x and HSTL-x.
The LTC3831-1 is a voltage mode synchronous step-down DC/DC controller. The LTC3831-1 includes a fixed frequency PWM oscillator for low output ripple operation. The output voltage (termination voltage) tracks the input reference voltage and is regulated at one-half of the reference voltage. The IC's 300kHz free-running clock frequency can be externally adjusted with an external signal or synchronized from 100kHz to 500kHz to minimize noise interference.
The LTC3831-1 is housed in a 16-lead SSOP package. Pricing starts at $2.90 each for 1,000-piece quantities.
Summary of Features: LTC3831-1
Tested 0.75V Output Voltage: Regulates down to 0.4V
Output Voltage Tracks at 50% of Input Voltage
No Current Sense Resistor Required
Low Supply Voltage from 3V to 8V
Programmable Soft-Start
External Clock Synchronization
Company Background
Linear Technology Corporation was founded in 1981 as a manufacturer of high performance linear integrated circuits. Linear Technology products include operational, instrumentation and audio amplifiers; voltage regulators,power management devices, DC-DC converters and voltage references; comparators; monolithic filters; communications interface circuits; one-chip data acquisition sub-systems; pulse-width modulators and sample-and-hold devices; and high frequencydevices. Applications for Linear Technology's high performance circuits include wireless and broadband telecommunications infrastructure, cellular telephones, networking products and satellite systems, notebook and desk top computers, computer peripherals, video/multimedia, industrial and medical instrumentation, automotive electronics, factory automation, process control, military and space systems, and high-end consumer products including digital cameras, MP3 players and other electronic products.
