Global Mixed-mode Technology Inc.
G2997
DDR Termination Regulator
Features
Support Both DDR I (1.25VTT) and DDR II
(0.9 VTT) Requirements
Input Voltage Range: 3.3V to 5.5V
VLDOIN Voltage Range: 1.2V to 3.6V
Requires Only 20µF Ceramic Output Capaci-
tance
Supports High-Z in S3 and Soft-Off in S5
Integrated Divider Tracks 1/2 VDDQSNS for
Both VTT and VTTREF
Remote Sensing (VTTSNS)
±20mV
Accuracy for VTT and VTTREF
10mA Buffered Reference (VTTREF)
Built-In Soft-Start
Over Current Protection
Thermal Shutdown Protection
MSOP-10 and MSOP-10(Exposed Pad) Package
General Description
The G2997 is a 3A sink/source tracking termination
regulator. It is specifically designed for low-cost/
low-external component count systems. The G2997
maintains a high speed operational amplifier that pro-
vides fast load transient response and only requires
20µF (2x10µF) of ceramic output capacitance. The
G2997 supports remote sensing functions and all fea-
tures required to power the DDR I / DDR II VTT bus
termination according to the JEDEC specification. In
addition, the G2997 includes integrated sleep-state
controls placing VTT in High-Z in S3 (suspend to RAM)
and soft-off for VTT and VTTREF in S5 (Shutdown).
The G2997 is available in the thermally efficient 10pin
MSOP and MSOP (Exposed PAD).
Applications
DDR I/II Memory Termination
SSTL−2, SSTL−18
HSTL Termination
Ordering Information
ORDER
NUMBER
G2997P7U
G2997F6U
MARKING
G2997
G2997
TEMP.
RANGE
-40°C~85°C
-40°C~85°C
PACKAGE
(Pb free)
MSOP-10
MSOP-10 (FD)
Note: P7: MSOP-10
F6: MSOP-10 (FD)
U: Tape & Reel
(FD): Thermal Pad
Pin Configuration
Typical Application Circuit
G2997
VDDQSNS
VLDOIN
VTT
PGND
VTTSNS
1
2
3
4
5
10 VIN
9
8
7
6
S5
GND
S3
VTTREF
2.5V
VDDQSNS
VLDOIN
VIN
S5
GND
S3
VTTREF
C2
0.1µF
S3
VIN=5V
S5
Thermal
Pad
VTT
C1
2*10µF
PGND
VTTSNS
Top View
MSOP-10
Bottom View
Note: Recommend connecting the Thermal Pad to the GND for excellent power dissipation.
Ver: 1.1
Jul 06, 2006
TEL: 886-3-5788833
http://www.gmt.com.tw
1
GMT [ GLOBAL MIXED-MODE TECHNOLOGY INC ]
