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Technical content
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 V TT voltage with two external resistors generating reference voltage. The quiescent current is as low as 750 µA @ V CNTL = 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
NUMBER MARKING TEMP. RANGE PACKAGE (Green) G2992F1U G2992 -40 °C to +85°C SOP-8 (FD) Note: F1: SOP-8 (FD) U: Tape & Reel Pin Configuration COUT RDUMMY RTT CIN CCNTL CSSR2 VIN VCNTL VREF GND VOUT EN VCNTL=3.3V VIN=2.5V 2N7002 DDR I COUT RDUMMY RTT CIN CCNTL CSSR2 VIN VCNTL VREF GND VOUT EN VCNTL=3.3V VIN=1.8V 2N7002 COUT RDUMMY RTT CIN CCNTL CSSR2 VIN VCNTL VREF GND VOUT EN VCNTL=3.3V VIN=1.5V 2N7002 DDR II DDR III* * Recommended VCTRL =3.3V VOUT VREF SOP-8 (FD) G2992 VIN GND NC NC VCNTL NC Thermal Pad Typical Application Circuit Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation. COUT RDUMMY RTT CIN CCNTL CSSR2 VIN VCNTL VREF GND VOUT EN VCNTL=3.3V VIN=2.5V 2N7002 DDR I COUT RDUMMY RTT CIN CCNTL CSSR2 VIN VCNTL VREF GND VOUT EN VCNTL=3.3V VIN=1.8V 2N7002 COUT RDUMMY RTT CIN CCNTL CSSR2 VIN VCNTL VREF GND VOUT EN VCNTL=3.3V VIN=1.5V 2N7002 DDR II DDR III* * Recommended VCTRL =3.3V VOUT VREF SOP-8 (FD) G2992 VIN GND NC NC VCNTL NC Thermal Pad VOUT VREF SOP-8 (FD) G2992 VIN GND NC NC VCNTL NC Thermal Pad Typical Application Circuit Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation.