SC1110

SINK AND SOURCE DC/DC CONTROLLER FOR TERMINATION POWER SUPPLY APPLICATIONS PRELIMINARY - October 9, 2000 SC1110 TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com DESCRIPTION The SC1110 is a low-cost, full featured, synchronous voltage-mode controller designed to generate termination voltage in double data rate (DDR) memory systems and other applications where wide data bus need to be actively terminated. Synchronous control of the MOSFET half bridge allows power flowing bidirectionally. The termination voltage can be tightly regulated to track the chipset voltage, i.e. to be exactly 50% of that at all times. The SC1110 is ideal for low cost implementation of termination voltage supplies. SC1110 features include temperature compensated voltage reference, triangle wave oscillator and current sense comparator circuitry, and allows the use of inexpensive N-channel power switches. The SC1110 operates at a fixed 250kHz, providing an optimum compromise between efficiency, transient performance, external component size, and cost. FEATURES = Generates termination voltages for active termina= 1% set point accuracy = For ±7A output current, transient regulation is bet= VREFIN pin available = Buffered VREFOUT for system usage = RDSON sensing for over current protection in hiccup = Soft start and logic input enabling = 250kHz switching for best transient and efficiency = Gate drive capable for 0.5A sourcing and sinking APPLICATIONS = For DDR memory systems = For ...