Global Mixed-mode Technology Inc.
G2992
3A DDR Bus Termination Regulator
Features
V
CNTL
Supply Voltage: 3.3V to 5.5V
Termination Supply Voltage: 1.8V to 3.6V
Support Both DDR I(1.25V
TT
) and DDR II (0.9
V
TT
) Requirements
Requires Only 20µF Ceramic Output Capacitor
Low Output Offset
3A Source and Sink Current
Low External Component Count
No Inductor Required
Thermal Shutdown Protection
Over Current Protection
Suspend to RAM (STR) Function with
High-impedance output
SOP-8 (FD) Package
General Description
The G2992 is a linear regulator designed to meet the
JEDEC SSTL-18, SSTL-2 and SSTL-3 (Series Stub
Termination Logic) specifications for termination of
DDR I / II -SDRAM. It contains a high-speed opera-
tional amplifier that provides excellent response to the
load transients. This device can deliver 3A continuous
current in the application such as required for DDR I/ II
SDRAM termination. The G2992 can easily provide
the accurate V
TT
voltage with two external resistors
generating reference voltage. The quiescent current is
as low as 750µA @ V
CNTL
= 3.3V. So the power con-
sumption can meet the low power consumption appli-
cations. The G2992 also has a shutdown function by
setting V
REF
smaller than 0.2V, that provides Suspend
to RAM (STR) functionality. When in the shutdown
mode, the V
TT
output (on V
OUT
pin) will be tri-state
providing a high impendence. A power saving advan-
tage can be obtained in this mode through lowering
the quiescent current to 50μA @ V
CNTL
= 3.3V.
Applications
DDR-SDRAM Termination Voltage
DDR I / DDR II Termination Voltage
SSTL-18
SSTL-2
SSTL-3
Ordering Information
ORDER
MARKING
NUMBER
G2992F1U
G2992
Note: U: Tape & Reel
(FD): Thermal Pad
TEMP.
RANGE
-40°C to +85°C
PACKAGE
(Pb free)
SOP-8 (FD)
Pin Configuration
Typical Application Circuit
G2992
VIN
GND
1
2
8
7
6
5
V
CNTL
=3.3V
NC
NC
VCNTL
NC
2N7002
EN
V
IN
=2.5V
R
1
VIN
VREF
R
2
C
SS
VCNTL
VOUT
GND
C
OUT
R
DUMMY
C
IN
C
CNTL
R
TT
VREF
3
VOUT
4
SOP-8(FD)
Ver: 1.0
Aug 29, 2006
TEL: 886-3-5788833
http://www.gmt.com.tw
1
GMT [ GLOBAL MIXED-MODE TECHNOLOGY INC ]
