G2996 Datasheet, PDF (1/13 Pages) Global Mixed-mode Technology Inc – DDR I/II Termination Regulator

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
Applications
„ DDR-SDRAM Termination Voltage
„ DDR-I / DDR-II Termination Voltage
„ SSTL-2
„ SSTL-3
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 to180µA
@ 2.5V.
Ordering Information
ORDER
NUMBER
ORDER NUMBER
(Pb free)
G2996P1U
G2996P1Uf
G2996F1U
G2996F1Uf
Note: P1:SOP-8
F1:SOP-8(FD)
U: Tape & Reel (FD): Thermal Pad
Pin Configuration
MARKING
G2996
G2996
TEMP.
RANGE
-40°C to 85°C
-40°C to 85°C
PACKAGE
SOP-8
SOP-8 (FD)
Typical Application Circuit
GND 1
SD 2
VSENSE 3
VREF 4
G2996
SOP-8
8 VTT
7 PVIN
6 AVIN
5 VDDQ
Thermal
Pad
SD
V_DDQ=2.5V
V_DD=2.5V
+
47µF
SD
V_DDQ
V_REF
AV_IN
V_SENSE
PV_IN
V_TT
GND
+ ^VREF=1.25V
0.01µF
V_TT=1.25V
+
220µF
Ver: 2.3
May 16, 2006
TEL: [phone]
http://www.gmt.com.tw
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