|
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
TEL: 886-3-5788833
http://www.gmt.com.tw
|