G2992 Global Mixed-mode Technology 3A DDR Bus Termination Regulator Features 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 current 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 consumption can meet the low power consumption applications. The G2992 also has a shutdown function by setting 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. 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 Ordering Information ORDER 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 G2992 1 8 NC GND 2 7 NC 6 VCNTL 5 NC VREF 3 DDR II VCNTL=3.3V VIN Thermal Pad VOUT 4 VIN=1.8V RTT R1 2N7002 EN VIN VCNTL VREF R2 CSS CIN CCNTL VOUT COUT RDUMMY GND SOP-8 (FD) Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation. Typical Application Circuit DDR III* DDR I VCNTL=3.3V VCNTL=3.3V VIN=2.5V 2N7002 EN VIN=1.5V RTT R1 VIN VREF R2 CSS VCNTL CIN CCNTL VOUT GND RTT R1 2N7002 EN COUT RDUMMY VIN VREF R2 CSS VCNTL CIN CCNTL VOUT GND COUT R DUMMY * Recommended VCTRL =3.3V TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.7 Jun 26, 2012 1