Global Mixed-mode Technology Inc.
DDR I/II Termination Regulator
General Description
G2996
Features
Operation Supply Voltage: 1.6V to 5.5V
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 VSENSE pin, the G2996 can pro-
vide superior load regulation. The G2996 provides a
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
VREF output as the reference for the applications of the
chipset and DIMMs.
Applications
DDR-SDRAM Termination Voltage
The G2996 can easily provide the accurate VTT and
VREF 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.
DDR-I / DDR-II Termination Voltage
SSTL-2
SSTL-3
The G2996 also has an active low shutdown ( SD ) pin
that provides Suspend to RAM (STR) functionality.
When SD is pulled low, the VTT output will be tri-state
providing a high impendence, but VREF will remain ac-
tive. A power saving advantage can be obtained in this
mode through lowering the quiescent current to180µA
@ 2.5V.
Ordering Information
ORDER
NUMBER
G2996P1U
G2996F1U
ORDER NUMBER
TEMP.
RANGE
MARKING
PACKAGE
(Pb free)
G2996P1Uf
G2996F1Uf
G2996
G2996
-40°C to 85°C
-40°C to 85°C
SOP-8
SOP-8 (FD)
Note: P1:SOP-8
U: Tape & Reel
F1:SOP-8(FD)
(FD): Thermal Pad
Pin Configuration
Typical Application Circuit
G2996
8
7
6
5
1
2
3
4
VTT
GND
SD
SD
VREF
V
REF=1.25V
SD
+
+
0.01µF
VDDQ
VDDQ=2.5V
PVIN
AVIN
VDDQ
Thermal
Pad
V
DD=2.5V
AVIN
PVIN
VSENSE
VTT
VSENSE
VREF
VTT=1.25V
220µF
+
GND
47µF
SOP-8
Ver: 2.3
May 16, 2006
TEL: 886-3-5788833
http://www.gmt.com.tw
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