G2998 台湾致新代理商 GMT LDO系列 DDR终结器

General Description
The G2998/G2999 is a 3A sink/source tracking termi-nation regulator. It is specifically designed for low-cost/low-external component count systems. The G2998/ G2999 maintains a high speed operational amplifier that provides fast load transient response and only requires 20μF (2 × 10μF) of ceramic output capacitance. The G2998/G2999 supports remote sensing functions and all features required to power the DDR I / DDR II / DDR III / DDR IIIL VTT bus termination according to the JEDEC specification. In addition, the G2998/ G2999 also has an Enable (EN) pin that provides Suspend to RAM (STR) functionality. When EN is pulled low, VREF will remain active, but VTT output will be turned off and discharged to the ground through internal MOSFETs in G2998 version and VTT output will be in tri-state in G2999 version. A power saving advantage can be ob-tained in this mode through lowering the quiescent cur-rent to150μA @ VCC=3.3V.

The G2998/G2999 is available in the MSOP-8 and SOP-8 package with the Thermal pad.

Features
Support and DDR I (1.25VTT), DDR II (0.9 VTT) , DDR III (0.75 VTT) , and DDR IIIL (0.675VTT)   Requirements
Input Voltage Range: 3V to 5.5V
VTT_IN Voltage Range: 1.2V to 3.6V
Requires Only 20μF Ceramic Output Capacitance
VTT Pulled Low by 2kΩResistor in Stand-By Mode (G2998 version)
VTT Tri-State in Stand-By Mode   (G2999 version)
Integrated Divider Tracks 1/2 VDDQ for Both
VTT and VREF Remote Sensing (VTTS)
±20mV Accuracy for VTT
±30mV Accuracy for VREF
Built-In Soft-Start
Over Current Protection
Thermal Shutdown Protection
MSOP-8 and SOP-8(Thermal Pad) Package

Applications
DDR I/II/III/IIIL Memory Termination
SSTL−2, SSTL−18
HSTL Termination

Ordering Information

ORDER NUMBER (Pb free/Green)	MARKING	TEMP. RANGE	PACKAGE
G2998P81U	G2998	40°C~ +85°C	MSOP-8
G2998F11U	G2998	40°C~ +85°C	SOP-8（FD）
G2999F11U	G2999	40°C~ +125°C	SOP-8（FD）