G2992 Global Mixed-mode Technology Inc. 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 -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 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: 1.8V to 3.6V Support Both DDR I(1.25VTT) and DDR II (0.9 VTT) 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 Termination Voltage SSTL-18 SSTL-2 SSTL-3 Ordering Information ORDER MARKING NUMBER G2992F1U G2992 TEMP. RANGE PACKAGE (Pb free) -40°C to +85°C SOP-8 (FD) Note: U: Tape & Reel (FD): Thermal Pad Pin Configuration Typical Application Circuit VCNTL=3.3V G2992 VIN GND 8 1 2 7 NC VIN=2.5V NC VREF 3 6 VCNTL VOUT 4 5 NC RTT R1 2N7002 EN VIN VREF R2 CSS VCNTL CIN CCNTL VOUT GND COUT RDUMMY SOP-8(FD) TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.0 Aug 29, 2006 1 G2992 Global Mixed-mode Technology Inc. Absolute Maximum Ratings Recommend Operation Range (3) (1) Supply Voltage VCNTL to GND. . . . . . . . . . . . . . . . . . . . . . -0.3V to +7V Maximum Junction Temperature, TJ. . . . . . . . 150°C Storage Temperature Range, TSTG. . -65°C to+150°C Reflow Temperature (soldering, 10sec) . . . . . . 260°C Thermal Resistance Junction to Ambient, (θJA) SOP-8 (FD). . . . . . . . . . . . . . . . . . . . . . . . . . ..50°C/W Electrostatic Discharge, VESD Human body mode. . . . . . . . . . . . . . . . . . . . . 2000V(2) Operating Ambient Temperature Range TA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40°C to +85°C VCNTL to GND. . . . . . . . . . . . . . . . . . . . . . 3.3V to 5.5V VIN to GND. . . . . . . . . . . . . . . . . . . . . . . . 1.8V to 3.6V VREF to GND . . . . . . . . . . . . . . . . . . . . . . . .0 to VCNTL Note: (1) : Absolute maximum rating indicates limits beyond which damage to the device may occurs. : Human body model : C = 100pF, R = 1500Ω, 3 positive pulses plus 3 negative pulses. (3) :VIN and VREF mustn’t be higher than VCNTL. (2) Electrical Characteristics Specifications with standard typeface are for TA=25°C, VIN=2.5V, VCNTL=3.3V, VREF=1.25V, COUT=20µF. Unless otherwise specified. PARAMETER SYMBOL Output Offset Voltage VTT output voltage VOS VTT VTT Output Voltage Load Regulation (DDR I/DDR II) ∆VTT Input Voltage Range (DDR I/DDR II) CONDITIONS VCNTL ICNTL Quiescent Current in Shutdown Current Limit Thermal Shutdown Temperature Thermal Shutdown Hysteresis Shutdown High Trigger Level Output ISD ILIMIT TTS THYS VIH Shutdown Low Trigger Level Output VIL TYP MAX UNIT -20 --- 0 1.25/0.9 20 --- mV V (DDR I/DDR II) IVTT=0, VREF=½VIN -20 --- 20 |IVTT|<1.5A,VREF=½VIN |IVTT|<3A, VREF =½VIN -30 -40 ----- 30 40 mV 1.8 ----- 2.5/1.8 3.3 750 3.6 5.5 1500 V V µA --- 50 90 µA 3.3V≦VCNTL≦5.5V 3 --- --160 ----- A °C --- 20 --- °C Output active Output disable 0.8 --- ----- --0.2 V V VIN Control Voltage Range (DDR I/DDR II) Quiescent Current MIN IOUT=0A VREF<0.2V TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.0 Aug 29, 2006 2 G2992 Global Mixed-mode Technology Inc. Typical Performance Characteristics CCNTL=1µF/MLCC/X5R, CIN=22µF/MLCC/X7R, CSS=1µF/MLCC/X5R, COUT=20µF/X5R/MLCC unless otherwise noted. VOUT is Shorted to GND VOUT is Shorted to VIN (2.5V) VCNTL=5.0V,VIN=2.5V VCNTL=5.0V,VIN=2.5V VOUT Load Transient Response VOUT Load Transient Response VCNTL=5.0V,VIN=2.5V VCNTL=5.0V,VIN=1.8V Sourcing Current Limit vs Temperature Sourcing Current Limit vs Temperature 5.6 4 5.4 3.9 Sourcing Current Limit (A) Sourcing Current Limit (A) 5.2 5 4.8 4.6 4.4 VCNTL=3.3V,VIN=1.8V 4.2 4 3.8 VCNTL=5.5V,VIN=1.8V 3.6 3.8 VCNTL=3.3V,VIN=2.5V 3.7 3.6 3.5 VCNTL=5.5V,VIN=2.5V 3.4 3.4 3.2 -40 3.3 -20 0 20 40 60 80 100 120 -40 -20 0 20 40 60 80 100 120 Temperature (°C) Temperature (°C) TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.0 Aug 29, 2006 3 G2992 Global Mixed-mode Technology Inc. Typical Performance Characteristics (continued) Sinking Current Limit vs Temperature 4.4 4.3 4.3 4.2 4.2 VCNTL=5.5V,VIN=1.8V 4.1 Sinking Current Limit (A) Sinking Current Limit (A) Sinking Current Limit vs Temperature 4.4 4 3.9 3.8 3.7 3.6 3.5 VCNTL=3.3V,VIN=1.8V 3.4 3.9 3.8 3.7 3.6 3.5 3.2 -20 0 20 40 60 80 Temperature (°C) 100 -40 120 -20 40 60 80 100 120 1.2 1.15 VCNTL Supply Current (mA) 0.7 0.6 VCNTL=5V 0.5 0.4 VCNTL=3.3V 0.3 VCNTL=5.0V,VIN=1.8V 1.1 1.05 1 0.95 0.9 0.85 0.8 0.2 -20 0 20 40 60 Temperature (°C) 80 100 -2 120 -1.5 -1 -0.5 0 0.5 1 1.5 2 100 120 VOUT Load Current (A) RDS(ON) vs Temperature RDS(ON) vs Temperature 0.16 0.18 0.17 0.15 VIN=0.9V 0.16 VIN=0.85V VIN=0.9V 0.14 0.15 RDS(ON) (Ω) RDS(ON) (Ω) 20 VCNTL Supply Current vs Vout Load Current VREF Shutdown Threshold vs Temperature 0.14 VIN=0.8V 0.13 VIN=0.85V 0.13 0.12 VIN=0.8V 0.11 0.12 VCNTL=3.3V 0.11 0.1 VCNTL=5.0V 0.09 0.1 -40 0 Temperature (°C) 0.8 VREF Shutdown Threshold (V) VCNTL=3.3V,VIN=2.5V 3.3 3.2 -40 VCNTL=5.5V,VIN=2.5V 4 3.4 3.3 -40 4.1 -20 0 20 40 60 80 100 -40 120 Temperature (°C) -20 0 20 40 60 80 Temperature (°C) TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.0 Aug 29, 2006 4 G2992 Global Mixed-mode Technology Inc. Typical Performance Characteristics (continued) VCNTL Supply Current vs. VCNTL Supply Voltage 1 1 0.95 0.95 VCNTL Supply Current (mA) VCNTL Supply Current (mA) VCNTL Supply Current vs Temperature 0.9 0.85 0.8 0.75 0.7 0.85 TA=25°C 0.8 0.75 0.7 VCNTL=5.0V,VIN=2.5V 0.65 TA=120°C 0.9 TA=0°C 0.65 -40 -20 0 20 40 60 80 100 120 3.3 3.6 3.9 Temperature (°C) 62 69 60 66 VCNTL Shutdown Current (µA) VCNTL Shutdown Current (µA) 5.7 6 VCNTL Shutdown Current vs VCNTL Supply Voltage VCNTL Shutdown Current vs Temperature 58 56 54 52 50 VCNTL=5.0V,VIN=2.5V 48 4.2 4.5 4.8 5.1 5.4 VCNTL Supply Voltage (V) 63 60 TA=120°C 57 54 TA=25°C 51 48 TA=0°C 45 46 -40 -20 0 20 40 60 Temperature (°C) 80 100 3.3 120 3.9 4.2 4.5 4.8 5.1 5.4 5.7 6 VCNTL Supply Voltage (V) VIN Dropout Voltage vs Output Current Recommended Minimum Footprint 1.2 SOP-8 (FD) VREF=0.9V VCNTL=3.3V 1 3.6 Dropout Voltage (V) TA=25°C 0.8 TA=75°C 0.6 TA=125°C 0.4 0.2 TA=-50°C 0 0 0.5 1 1.5 2 2.5 3 Output Current (A) TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.0 Aug 29, 2006 5 G2992 Global Mixed-mode Technology Inc. Pin Description PIN NAME 1 2 VIN GND Terminator Power pin. Ground FUNCTION 3 VREF Terminator reference input voltage, 1.25V for DDR I, 0.9V for DDR II. Below 0.2V, the chip will be shutdown. 4 VOUT Terminator output pin (VTT voltage supplied) 5,7,8 6 NC VCNTL No Connection Internal circuit power pin, at least 3.3V Block Diagram VIN VCNTL Shutdown VREF + VOUT GND Application Information voltage which is generated by a resistor divider between VIN and GND. Using a capacitor tapped to the voltage divider can form a low-pass filter. It can increase both the soft-start interval and the noise immunity. Output Capacitor For stable operation, total capacitance of the VTT output terminal can be equal or greater than 20µF. The output capacitor should be located near VTT output terminal as close as possible to minimize the effect of ESR and ESL. Input Capacitor Adding a capacitance close to VIN pin can improve the VTT performance when fast load- transient. In general, 1/2 COUT is recommended for the VIN capacitance. Separating the VIN and VCNTL pins will get better transient performance. Power on sequence For safely operation, The G2992 must keep VCNTL voltage larger than VIN, this condition is due to the internal parasitic diodes between VIN to VCNTL. The G2992 will consume large current when VIN voltage is larger than VCNTL. A ceramic capacitance with a value between 1.0µF and 4.7µF close to the VCNTL pin is recommended to stabilize the VCNTL voltage. Consideration of the VREF Voltage The VREF voltage is applied by a buffered mid-rail TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.0 Aug 29, 2006 6 G2992 Global Mixed-mode Technology Inc. Package Information D1 0.008TYP E1 E H L D θ 0.015x45º A2 0.004MAX. e A SEATING PLANE A1 B SOP- 8 (F1) Package Note: 1. JEDEC Outline: MS-012 AA/E.P. Version: N/A 2. Dimension “D” does not include mold flash, protrusions or gate burrs. Mold flash, protrusions and gate burrs shall not exceed .15mm (.006in) per side. 3. Dimensions “E” does not include inter-lead flash, or protrusions inter-lead flash and protrusions shall not exceed .25mm (.010in) per side. SYMBOL A A1 A2 B D MIN. DIMENSION IN MM MAX. 1.35 0.00 ----- DIMENSION IN INCH MIN. MAX. 1.75 0.13 1.50 0.053 0.000 ----- 4.98 0.189 3.99 0.150 0.41TYP 4.80 0.069 0.005 0.059 0.016TYP 0.196 E e 3.81 H L θ 5.80 0.41 6.20 1.27 0.228 0.016 0.244 0.050 0º --------- 8º 2.29 2.29 0º --------- 8º 0.090 0.090 1.27TYP D1 E1 0.157 0.05TYP Taping Specification PACKAGE Q’TY/REEL SOP-8 (FD) 2,500 ea Feed Direction Typical SOP Package Orientation GMT Inc. does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and GMT Inc. reserves the right at any time without notice to change said circuitry and specifications. TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.0 Aug 29, 2006 7