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G2992 Datasheet, PDF (1/1 Pages) Global Mixed-mode Technology Inc – 3A DDR Bus Termination Regulator
Global Mixed-mode Technology
G2992
3A DDR Bus Termination Regulator
Features
„ VCNTL Supply Voltage: 3.3V to 5.5V
„ Termination Supply Voltage: 1.2V to 3.6V
„ Support DDR I(1.25VTT), DDR II (0.9 VTT), DDR III
(0.75VTT), and DDR IIIL (0.675VTT) 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
Applications
„ DDR-SDRAM Termination Voltage
„ DDR I / DDR II / DDR III / DDR IIIL Termination
Voltage
„ SSTL-18
„ SSTL-2
„ SSTL-3
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/III/IIIL -SDRAM. It contains a high-speed operational
amplifier that provides excellent response to the load
transients. This device can deliver 3A continuous cur-
rent in the application such as required for DDR I/II/III
/IIIL SDRAM termination. The G2992 can easily provide
the accurate VTT voltage with two external resistors
generating reference voltage. The quiescent current is
as low as 750µA @ VCNTL = 3.3V. So the power con-
sumption can meet the low power consumption applica-
tions. The G2992 also has a shutdown function by set-
ting VREF smaller than 0.2V, that provides Suspend to
RAM (STR) functionality. When in the shutdown mode,
the VTT output (on VOUT pin) will be tri-state providing a
high impendence. A power saving advantage can be
obtained in this mode through lowering the quiescent
current to 50μA @ VCNTL = 3.3V.
Ordering Information
ORDER
NUMBER
G2992F1U
Note: F1: SOP-8 (FD)
U: Tape & Reel
MARKING
G2992
Pin Configuration
G2992
VIN 1
8 NC
GND 2
VREF 3
Thermal
Pad
7 NC
6 VCNTL
VOUT 4
5 NC
SOP-8 (FD)
Note: Recommend connecting the Thermal Pad to
the Ground for excellent power dissipation.
Typical Application Circuit
TEMP.
RANGE
-40°C to +85°C
PACKAGE
(Green)
SOP-8 (FD)
VCNTL=3.3V
VIN=1.8V
2N7002
EN
DDR II
R1
VIN VCNTL
VREF VOUT
R2
CSS
GND
CIN CCNTL
RTT
COUT RDUMMY
VCNTL=3.3V
VIN=2.5V
2N7002
EN
DDR I
R1
VIN VCNTL
VREF VOUT
R2
CSS
GND
CIN CCNTL
RTT
COUT RDUMMY
VCNTL=3.3V
VIN=1.5V
2N7002
EN
DDR III*
R1
VIN VCNTL
VREF VOUT
R2
CSS
GND
CIN CCNTL
RTT
COUT RDUMMY
Ver: 1.7
Jun 26, 2012
* Recommended VCTRL =3.3V
1
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http://www.gmt.com.tw