Global Mixed-mode Technology Inc.
G2996
DDR I/II Termination Regulator
Features
Operation Supply Voltage: 1.6V to 5.5V
Low Supply Current: 280µA @ 2.5V
Low Output Offset
Source and Sink Current
Low External Component Count
No Inductor Required
No external Resistors Required
Thermal Shutdown Protection
Suspend to RAM (STR) function
SOP-8 with Power-Pad package
General Description
The G2996 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-SDRAM. It contains a high-speed operational
amplifier that provides excellent response to the load
transients. This device can deliver 1.5A/0.9A continu-
ous current and transient peaks up to 3A/1.8A in the
application as required for DDRI/II-SDRAM termination.
With an independent V
SENSE
pin, the G2996 can pro-
vide superior load regulation. The G2996 provides a
V
REF
output as the reference for the applications of the
chipset and DIMMs.
The G2996 can easily provide the accurate V
TT
and
V
REF
voltages without external resistors that PCB ar-
eas can be reduced. The quiescent current is as low
as 280µA @ 2.5V. So the power consumption can
meet the low power consumption applications.
The G2996 also has an active low shutdown (
SD ) pin
that provides Suspend to RAM (STR) functionality.
When SD is pulled low, the V
TT
output will be tri-state
providing a high impendence, but V
REF
will remain ac-
tive. A power saving advantage can be obtained in this
mode through lowering the quiescent current to180
µ
A
@ 2.5V.
Applications
DDR-SDRAM Termination Voltage
DDR-I / DDR-II Termination Voltage
SSTL-2
SSTL-3
Ordering Information
ORDER
NUMBER
G2996P1U
G2996F1U
Note: P1:SOP-8
U: Tape & Reel
ORDER NUMBER
(Pb free)
G2996P1Uf
G2996F1Uf
F1:SOP-8(FD)
(FD): Thermal Pad
MARKING
G2996
G2996
TEMP.
RANGE
-40°C to 85°C
-40°C to 85°C
PACKAGE
SOP-8
SOP-8 (FD)
Pin Configuration
G2996
GND
SD
VSENSE
VREF
1
2
3
4
8
7
6
5
VTT
PVIN
AVIN
VDDQ
Typical Application Circuit
SD
V
DDQ
=2.5V
Thermal
Pad
V
DD
=2.5V
SD
V
DDQ
AV
IN
PV
IN
47µF
+
V
REF
+
V
REF
=1.25V
0.01µF
V
SENSE
V
TT
GND
+
V
TT
=1.25V
220µF
SOP-8
Ver: 2.3
May 16, 2006
TEL: 886-3-5788833
http://www.gmt.com.tw
1
GMT [ GLOBAL MIXED-MODE TECHNOLOGY INC ]
