G2992_06 Datasheet, PDF (1/7 Pages) Global Mixed-mode Technology Inc – 3A DDR Bus Termination Regulator

Global Mixed-mode Technology Inc.
G2992
3A DDR Bus Termination Regulator
Features
„ V_CNTL Supply Voltage: 3.3V to 5.5V
„ Termination Supply Voltage: 1.8V to 3.6V
„ Support Both DDR I(1.25V_TT) and DDR II (0.9
V_TT) 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 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 -SDRAM. It contains a high-speed opera-
tional amplifier that provides excellent response to the
load transients. This device can deliver 3A continuous
current in the application such as required for DDR I/ II
SDRAM termination. The G2992 can easily provide
the accurate V_TT voltage with two external resistors
generating reference voltage. The quiescent current is
as low as 750µA @ V_CNTL = 3.3V. So the power con-
sumption can meet the low power consumption appli-
cations. The G2992 also has a shutdown function by
setting V_REF smaller than 0.2V, that provides Suspend
to RAM (STR) functionality. When in the shutdown
mode, the V_TT output (on V_OUT pin) will be tri-state
providing a high impendence. A power saving advan-
tage can be obtained in this mode through lowering
the quiescent current to 50μA @ V_CNTL = 3.3V.
Ordering Information
ORDER
NUMBER
MARKING
TEMP.
RANGE
G2992F1U G2992 -40°C to +85°C
Note: U: Tape & Reel
(FD): Thermal Pad
PACKAGE
(Pb free)
SOP-8 (FD)
Pin Configuration
Typical Application Circuit
G2992
VIN 1
8 NC
GND 2
7 NC
VREF ³
VOUT ⁴
SOP-8(FD)
6 VCNTL
5 NC
V_CNTL=3.3V
V_IN=2.5V
2N7002
EN
R₁
VIN VCNTL
VREF VOUT
R₂
C_SS
GND
C_IN C_CNTL
R_TT
C_{OUT RDUMMY}
Ver: 1.0
Aug 29, 2006
TEL: [phone]
http://www.gmt.com.tw
1