Global Mixed-mode Technology Inc.
DDR Termination Regulator
General Description
G2995
Features
Operation Supply Voltage: 1.6V to 5.5V
The G2995 is a linear regulator designed to meet the
JEDEC SSTL-2 and SSTL-3 (Series Stub Termination
Logic) specifications for termination of DDR-SDRAM.
It contains a high-speed operational amplifier that pro-
vides excellent response to the load transients. This
device can deliver 1.5A continuous current and tran-
sient peaks up to 3A in the application as required for
DDR-SDRAM termination. With an independent VSENSE
pin, the G2995 can provide superior load regulation.
The G2995 provides a VREF output as the reference for
the applications of the chipset and DIMMs.
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
SOP-8L with Power-Pad package
Applications
DDR-SDRAM Termination Voltage
The G2995 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
Ordering Information
ORDER
NUMBER
G2995P1U
G2995F1U
ORDER NUMBER
TEMP.
RANGE
MARKING
PACKAGE
(Pb free)
G2995P1Uf
G2995F1Uf
G2995
G2995
-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
G2995
8
7
6
5
1
2
3
4
VTT
NC
GND
VDDQ
VDDQ=2.5V
VREF
VREF=1.25V
+
0.01µF
PVIN
AVIN
VDDQ
Thermal
Pad
V
DD=2.5V
AVIN
PVIN
VSENSE
VTT
VSENSE
VREF
VTT=1.25V
+
+
GND
47µF
220µF
SOP-8
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 1.7
May 10, 2005
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