EUP7996 Datasheet | Eutech Microelectronics

DESCRIPTION The EUP7996 is a high performance linear regulator designed to provide power for termination of a DDR memory bus. It significantly reduces parts count, board space and overall system cost over previous switching solutions. The EUP7996 contains a high-speed operational amplifier to provide excellent response to load transients. The EUP7996 also incorporates a VSENSE pin to provide superior load regulation and a VREF output as a reference for chipset and DIMMs. .. FEATURES z z z z z z z z z z Extremely low quiescent current (305u A) Fast transient response time Capable of sourcing and sinking 1.5A for DDR-I termination Reference out for other memory and control ponents Low-current shutdown mode Over-temperature protection High accuracy output voltage at full-load Low external ponent count Available in SOP-8, SOP(FD) package Ro HS pliant and 100% lead (Pb)-free An additional feature found on the EUP7996 is an active low shutdown (SD) pin. When SD is pulled low the VTT output will Tri-state providing a high impedance output, but, VREF will remain active. A power savings advantage can be obtained in this mode through lower quiescent current. The EUP7996, used in conjunction with series termination resistors, provides an excellent voltage source for active termination schemes of high speed transmission lines as those seen in high speed memory buses. A typical DDR memory system is seen in Figure 1. APPLICATIONS z DDR-I and DDR-II termination voltage SIMPLIFIED SYSTEM DIRGRAM Figure 1. DS7996 Ver2.5 June.2005 Pin Configurations Package Type Pin Configurations (TOP VIEW) Plastic SOP-8(FD) ¡¯ Thermal Pad ¡¯ Pin Description .. SYMBOL GND SD VSENSE VREF VDDQ AVIN PVIN VTT DESCRIPTION Ground Shutdown Feedback pin for regulating VTT Buffered internal reference voltage of VDDQ/2 Input for internal reference equal to VDDQ/2 Analog input pin Power Input pin Output voltage for connection to termination resistors 1 2 3 4 5 6 7 8 Typical...