G2985 Global Mixed-mode Technology DDR Termination Regulator Features General Description VIN Input Voltage Range: 2.5V to 5.5V VLDOIN Voltage Range: 1.1V to 3.5V 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 Stable with Output Ceramic Capacitor PGOOD to Monitor Output Regulation EN Input for Shutdown Function (S3 Mode) Remote Sensing (VOSNS) 2A Source and Sink Current ±25mV Accuracy for VTT Refers to VTTREF ±10mA Buffered Reference (VTTREF) Built-In Soft-Start and UVLO Over Current Protection Thermal Shutdown Protection TDFN3X3-10 (Thermal Pad) Package The G2985 is a linear regulator designed to meet the JEDEC SSTL (Series Stub Termination Logic) specifications in DDRI/II/III/IIIL/IV –SDRAM systems. It is designed for the system which has low input voltage, low cost, low noise and space consideration. The G2985 provides accurate and fast response with up to 2A source/sink ability in load transient to track reference voltage with typically 20µF output capacitor. The terminated voltage can be generated by two external resistors or programmed by forcing REFIN pin at a desired voltage. Also the G2985 provides an open-drain PGOOD flag which monitors the output regulation and an EN signal to discharge VTT during STR (S3) mode. Applications DDR I/II/III/IIIL/IV Memory Termination SSTL_3, SSTL_2, SSTL_18, SSTL_15 HSTL Termination Notebook/Desktop/Server Telecom/Datacom, GSM Base Station, LCD-TV/PDP-TV, Copier/Printer, Set-Top Box Ordering Information ORDER NUMBER MARKING TEMP. RANGE PACKAGE (Green) G2985RE1D 2985 -40°C~85°C TDFN3X3-10 Note: RE: TDFN3X3-10 1: Bonding code D: Tape & Reel Pin Configuration Typical Application 1 VDDQ REFIN VIN 10 G2985 REFIN 1 VLDOIN 2 VO 3 PGND 4 VOSNS 5 10 10 VIN Thermal Pad 9 PGOOD 8 GND 7 EN 6 REFOUT VLDOIN VTT 2 3 4 5 TDFN3X3-10 G2985 VLDOIN VO PGND VOSNS PGOOD GND EN REFOUT 9 PGOOD 8 7 6 SLP_S3 VTTREF 0.1µF Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation. TEL: 886-3-5788833 http://www.gmt.com.tw Ver:1.0 Mar 07, 2014 1