G2987 Global Mixed-mode Technology DDR Termination Regulator Features General Description The G2987 is a linear regulator designed to meet the JEDEC SSTL (Series Stub Termination Logic) specifications in DDRI/II/III/IIIL/IV –SDRAM systems. It provides accurate and fast response with up to 1.8A source/sink ability in load transient to track reference voltage. The terminated voltage can be generated by two external resistors or programmed by forcing VREF pin at a desired voltage. Also the G2987 operate in low power consumption as low as 0.7mA and it has a shutdown function by setting VREF lower than 0.15V then the VTT is turned off and discharged via an internal MOSFET. This function obtains low quiescent current as 50μA for STR mode. Support DDR I (1.25 VTT), DDR II (0.9 VTT), DDR III (0.75 VTT), DDR IIIL (0.675VTT) and DDR IV (0.6 VTT) Requirements VCNTL Supply Voltage: 3V to 5.5V Termination Supply Voltage : 1.2V to 3.6V Stable with Output Ceramic Capacitor Over Current Protection Thermal Shutdown Protection Shutdown Function for STR (S3) Mode Adjustable Output Voltage with Resistors Built-In Soft-Start Power MOS integrated SOP-8 (FD) and MSOP-8 (FD) Package RoHS Compliant Applications Ordering Information DDR I/II/III/IIIL/IV Memory Termination SSTL_3, SSTL_2, SSTL_18, SSTL_15 Notebook/Desktop/Server Telecom/Datacom, GSM Base Station, LCD-TV/PDP-TV, Copier/Printer, Set-Top Box ORDER NUMBER MARKING TEMP. RANGE PACKAGE (Green) G2987F11U G2987F51U G2987 G2987 -40°C~85°C -40°C~85°C SOP-8 (FD) MSOP-8 (FD) Note: F1: SOP-8 (FD) F5: MSOP-8 (FD) 1: Bonding Code U : Tape & Reel Pin Configuration G2987 VIN 1 8 NC GND 2 7 NC 6 VCNTL 5 NC VREF 3 DDR II VCNTL=3.3V Thermal Pad VOUT 4 VIN=1.8V RTT R1 2N7002 EN VIN VCNTL VREF R2 CSS CIN CCNTL VTT VOUT COUT RDUMMY GND SOP-8 (FD)/MSOP-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 VTT VOUT GND RTT R1 2N7002 EN COUT RDUMMY VIN VREF R2 CSS CIN VCNTL CCNTL VTT VOUT GND COUT R DUMMY * Recommended VCTRL =3.3V TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 0.4 Jan 16, 2013 1