EUP7996
1.5A DDR Termination Regulator
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 V
SENSE
pin to provide
superior load regulation and a V
REF
output as a reference
for chipset and DIMMs.
An additional feature found on the EUP7996 is an active
low shutdown (SD) pin. When SD is pulled low the V
TT
output will Tri-state providing a high impedance output,
but, V
REF
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.
FEATURES
Extremely low quiescent current (305uA)
Fast transient response time
Capable of sourcing and sinking 1.5A for DDR-I
termination
Reference out for other memory and control
components
Low-current shutdown mode
Over-temperature protection
High accuracy output voltage at full-load
Low external component count
Available in SOP-8, SOP(FD) package
RoHS compliant and 100% lead (Pb)-free
APPLICATIONS
DDR-I and DDR-II termination voltage
SIMPLIFIED SYSTEM DIRGRAM
Figure 1.
DS7996 Ver2.5
June.2005
1
EUTECH [ EUTECH MICROELECTRONICS INC ]
