EUP7171 Datasheet, PDF (1/10 Pages) Eutech Microelectronics Inc – 2A Sink/Source Bus Termination Regulator

EUP7171
2A Sink/Source Bus Termination
Regulator
DESCRIPTION
FEATURES
The EUP7171 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 EUP7171 contains a high-speed operational
amplifier to provide excellent response to load transients.
It also has an independent power source pin (VCNTL)
for achieving better output driving capability. The
regulator can both sink and source up to 2A current. The
output termination voltage can be tightly regulated to
track 1/2 V_DDQ by two external voltage divider resistors.
The EUP7171, 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.
z Compatible with DDR-I (1.25VTT) or DDR-II
(0.9VTT) SDRAM Systems.
z Low Quiescent Current (1.1mA)
z Fast Transient Response Time
z Capable of Sourcing and Sinking 2A
z Adjustable VOUT by Two External Resistors
z Current Limiting Protection
z Over-Temperature Protection
z High Accuracy Output Voltage at Full-Load
z Low External Component Count
z Available in SOP-8 Exposed Pad Package
z RoHS Compliant and 100% Lead (Pb)-Free
APPLICATIONS
z DDR SDRAM Termination Voltage
Simplified System Diagram
DS7171 Ver1.0 Mar. 2005
Figure1.
1