G2997 Global Mixed-mode Technology Inc. DDR Termination Regulator Features General Description Support Both DDR I (1.25VTT) and DDR II (0.9 VTT) Requirements Input Voltage Range: 3.3V to 5.5V VLDOIN Voltage Range: 1.2V to 3.6V Requires Only 20µF Ceramic Output Capacitance Supports High-Z in S3 and Soft-Off in S5 Integrated Divider Tracks 1/2 VDDQSNS for Both VTT and VTTREF Remote Sensing (VTTSNS) ±20mV Accuracy for VTT and VTTREF 10mA Buffered Reference (VTTREF) Built-In Soft-Start Over Current Protection Thermal Shutdown Protection MSOP-10 and MSOP-10(Exposed Pad) Package The G2997 is a 3A sink/source tracking termination regulator. It is specifically designed for low-cost/ low-external component count systems. The G2997 maintains a high speed operational amplifier that provides fast load transient response and only requires 20µF (2x10µF) of ceramic output capacitance. The G2997 supports remote sensing functions and all features required to power the DDR I / DDR II VTT bus termination according to the JEDEC specification. In addition, the G2997 includes integrated sleep-state controls placing VTT in High-Z in S3 (suspend to RAM) and soft-off for VTT and VTTREF in S5 (Shutdown). The G2997 is available in the thermally efficient 10pin MSOP and MSOP (Exposed PAD). Ordering Information Applications DDR I/II Memory Termination SSTL−2, SSTL−18 HSTL Termination ORDER NUMBER MARKING TEMP. RANGE PACKAGE (Pb free) G2997P7U G2997F6U G2997 G2997 -40°C~85°C -40°C~85°C MSOP-10 MSOP-10 (FD) Note: P7: MSOP-10 F6: MSOP-10 (FD) U: Tape & Reel (FD): Thermal Pad Pin Configuration Typical Application Circuit G2997 VDDQSNS 1 2.5V 10 VIN VDDQSNS VLDOIN VLDOIN VTT 2 9 3 8 S5 GND PGND 4 7 S3 VTTSNS 5 6 VTTREF Top View MSOP-10 VTT Thermal Pad C1 2*10µF PGND VTTSNS VIN S5 VIN=5V S5 GND S3 S3 VTTREF C2 0.1µF Bottom View Note: Recommend connecting the Thermal Pad to the GND for excellent power dissipation. TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.1 Jul 06, 2006 1 G2997 Global Mixed-mode Technology Inc. Absolute Maximum Ratings (1) Recommend Operating Range (1) (2) Supply Voltage Range VIN, VLDOIN, VTTSNS, VDDQSNS, S3, S5..-0.3V to +6V PGND . . . . . . . . . . . . . . . . . . . . . . . . . . .-0.3V to 0.3V Output Voltage Range VTT, VTTREF . . . . . . . . . . . . . . . . . . . . . .-0.3V to 6V Maximum Junction Temperature,TJ . . . . .. . . ..160°C Storage Temperature Range, TSTG.-55°C to +160°C Reflow Temperature (soldering, 10sec). . . . . 260°C Thermal Resistance Junction to Ambient, (θJA) MSOP-10 . . . . . . . . . . . . . . . . . . . . . . . . . . 120°C/W MSOP-10 (FD) . . . . . . .. . . . . . . . . . . . . . . 60°C/W(3) VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3.3V to 5.5V S3, S5 . . . . . . . . . . . . . . . . . . . . . . . . . . .-0.1V to 5.5V VDDQSNS. . . . . . . .. . . . . . . . . . . . . . . . .1.6V to 3.6V VLDOIN . . . . . . . . . . . . . . . . . . . . . . . . . .1.2V to 3.6V PGND . . . . . . . . . . . . . . . . . . . . . .-0.1V to 0.1V Operating Ambient Temperature Range TA . . . . . . . . . . . . . . . . . . . . . . . .. . . . .-40°C to 85°C Note: (1) All voltage values are with respect to the network ground terminal unless otherwise noted. (2) VLDOIN, VTTSNS, VDDQSNS, S3, S5 must be lower than VIN on operation. (3) Please refer to PCB size described in EV2997-10. Electrical Characteristics Specifications with standard typeface are for TA=25°C, VIN=5V, VLDOIN=2.5V and VDDQSNS=2.5V. Unless otherwise specified. PARAMETER Supply current, VIN SYMBOL MIN TYP VVIN=5V, no load, S5=5V, S3 =5V VVIN=5V, no load, S5=5V, S3 =0V VVIN=5V, no load, S5=0V, S3 =0V 0.5 ----- 0.8 110 --- VVIN=5V, no load, S5=5V, S3 =5V IVLDOINSTB VVIN=5V, no load, S5=5V, S3 =0V IVLDOINSDN VVIN=5V, no load, S5=0V, S3 =0V ZVDDQSNS VVIN=5V, S5=5V, S3 =5V ------- IVIN Standby current, VIN IVINSTB Shutdown current, VIN Supply current, VLDOIN IVINSDN IVLDOIN Standby current, VLDOIN Shutdown current, VLDOIN VDDQSNS input Impedance VTTSNS input current VTT output voltage VTT Output Voltage Load Regulation (VTTREF-VTT) IVTTSNS VTT VOSVTT CONDITIONS VVIN=5V, S5=5V, S3 =5V (DDR I/DDR II) IVTT=0 |IVTT|<1.5A |IVTT|<3A VTT Source Current limit IVTTOCLSRC VTT=VDDQSNS/2 *0.95, PGOOD=Hi VTT=0 VTT Sink Current limit IVTTOCLSNK VTT=VDDQSNS/2 *1.05, PGOOD=Hi VTT=VVDDQSNS VTT leakage current in S3 mode VTT Discharge Current VTTREF output voltage IVTTLK S3=0V, S5=5V IDISCHARGE S5=0V, VDDQSNS=0, VTT=0.5V VTTREF (DDR I/DDR II) ∆VTTREF |IVTTREF|<10mA VIH S3 and S5 pin VIL S3 and S5 pin IILEAK S3 and S5 pin VTTREF Voltage Load Regulation High Level Input Voltage Low Level Input Voltage Logic input leakage current Thermal Shutdown Thermal Shutdown Hystersis TSD MAX UNIT 2 200 1 mA µA µA 0.03 2 mA 0.1 0.1 10 1 ------- 200 0.3 1.25/0.9 --1 --- µA µA KΩ -20 -30 -40 3 1.5 ------4 2 20 30 40 ----- µA V mV A 3 4 --- 1.5 --10 2 0.01 20 ------- µA mA ---20 1.6 1.25/0.9 ----- --20 --- V mV V ---1 ----- ----160 20 1 1 ----- V µA °C °C A TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.1 Jul 06, 2006 2 G2997 Global Mixed-mode Technology Inc. Typical Performance Characteristics CVLDOIN=10µF/MLCC/X5R, CVIN=1µF/MLCC/X5R, CVTTREF =0.1µF,CVTT=20µF/X5R/MLCC unless otherwise noted. VIN Supply Current vs Temperature VIN Shutdown Current vs Temperature 1.1 0.14 1 0.12 V IN Shutdown Current (µA) V IN supply current (mA) 0.9 0.8 0.7 0.6 0.5 V IN =5.0V 0.4 V DDQSNS=2.5V 0.3 V LDOIN =2.5V 0.2 0.1 0 -40 -20 0 20 40 60 80 0.1 0.08 0.06 V IN =5.0V 0.04 V DDQSNS=2.5V 0.02 V LDOIN =2.5V 0 -40 -20 100 120 140 0 Temperature( °C) VLDOIN Supply Current vs Temperature 20 40 60 80 Temperature( °C) 100 120 140 VLDOIN Shutdown Current vs Temperature 32 0.6 V LDOIN Shutdown Current (µA) V LDOIN Supply Current (µA) 31 30 29 28 27 V IN =5.0V V DDQSNS=2.5V V LDOIN =2.5V 26 25 24 23 22 -40 -20 0 20 40 60 80 Temperature ( °C) 0.5 0.4 0.3 0.1 0 -40 -20 100 120 140 VTT Discharge Current (mA) V TTREF Discharge Current (mA) 100 120 140 26 0.41 V TTREF =0.5V 0.4 0.39 0.38 0.37 0.33 20 40 60 80 Temperature ( °C) VTT Discharge Current vs Temperature 0.42 0.34 0 28 0.43 0.35 V LDOIN =2.5V 0.2 VTTREF Discharge Current vs Temperature 0.36 V IN =5.0V V DDQSNS=2.5V V IN =5.0V V DDQSNS=2.5V V LDOIN =2.5V 0.32 -40 -20 0 20 22 20 18 16 40 60 V TT=0.5V 24 V IN =5.0V V DDQSNS=2.5V V LDOIN =2.5V 14 -40 -20 80 100 120 140 Temperature ( °C) 0 20 40 60 80 100 120 140 Temperature ( °C) TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.1 Jul 06, 2006 3 G2997 Global Mixed-mode Technology Inc. Typical Performance Characteristics (continued) VTT Voltage Regulation vs VTT Voltage Regulation vs VTT Load Current (DDR I ) VTT Load Current (DDR II ) 1.27 0.918 1.26 V IN =5.0V 0.912 V DDQSNS=2.5V 0.906 V LDOIN =2.5V or 1.8V V TT Volatge (V) VTT Volatge (V) 1.265 1.255 1.25 0.9 1.24 0.876 -1 0 1 2 V DDQSNS=1.8V 0.888 0.882 -2 V IN =5.0V 0.894 1.245 -3 V LDOIN =1.8V 3 V LDOIN =1.5V V LDOIN =1.2V -3 -2 -1 0 1 V TT Load Current (A) V TT Load Current (A) 1.268 0.918 1.264 0.914 1.26 1.256 1.252 1.248 V IN =5.0V 1.244 V DDQSNS=2.5V V LDOIN =2.5V 1.24 1.236 -10 -8 -6 -4 -2 0 2 4 6 0.91 0.906 0.902 V IN =5.0V 0.898 V DDQSNS=1.8V 0.894 8 V LDOIN =1.8V 0.89 -10 -8 10 V TTREF Load Current (mA) -4 -2 0 2 4 6 8 10 VIN Supply Current vs VTT Load Current VDDQSNS Current vs Temperature 1.2 1.15 V IN =5.0V 13.5 V DDQSNS=2.5V 13 V IN Supply Current (mA) V DDQSNS Current (µA) -6 V TTREF Load Current (mA) 14 V LDOIN =2.5V 12.5 12 11.5 11 10.5 -40 -20 3 VTTREF Voltage Load Regulation vs VTTREF Load Current (DDR II ) V TTREF Voltage (V) V TTREF Voltage (V) VTTREF Voltage Load Regulation vs VTTREF Load Current (DDR I) 2 V IN =5.0V 1.1 V DDQSNS=1.8V V LDOIN =1.8V 1.05 1 0.95 0.9 0.85 0.8 0 20 40 60 80 -2 100 120 140 Temperature ( °C) -1.5 -1 -0.5 0 0.5 1 V TT Load Current (A) 1.5 2 TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.1 Jul 06, 2006 4 G2997 Global Mixed-mode Technology Inc. Typical Performance Characteristics (continued) Start Up Waveforms S5 Low to High Start Up Waveforms S5 Low to High Start Up Waveforms S3 Low to High Shutdown Waveforms S3 High to Low Shutdown Waveforms S3 and S5 High to Low VTTREF Voltage Transient Response ILoad=±10mA TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.1 Jul 06, 2006 5 Global Mixed-mode Technology Inc. G2997 Typical Performance Characteristics (continued) VTT Voltage Load Transient Response Recommended Minimum Footprint MSOP-10 MSOP-10 (FD) TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.1 Jul 06, 2006 6 G2997 Global Mixed-mode Technology Inc. Pin Description PIN NAME 1 2 DESCRIPTIONS VDDQSNS VDDQ sense input VLDOIN Power supply for the VTT and VTTREF output stage 3 4 VTT PGND Output voltage for connection to termination resistors, equal to VDDQSNS/2 Power ground output for the VTT output 5 6 VTTSNS VTTREF 7 8 9 S3 GND S5 Active low suspend to RAM mode control pin, VTT is turned off and left Hi-Z Ground Active low shutdown control pin, both VTT and VTTREF are turned off and discharged to ground 10 Thermal Pad VIN Analog input pin Recommend connecting the Thermal Pad to the GND for excellent power dissipation. Voltage sense input for the VTT LDO. Connect to plus terminal of the output capacitor Buffered output that is a reference output ,equal to VDDQSNS/2 Block Diagram VIN VLDOIN VDDQSNS VTTSNS S3 S5 SD/STB VTT VTTREF PGOOD GND PGND TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.1 Jul 06, 2006 7 G2997 Global Mixed-mode Technology Inc. Description S3, S5 Control and Soft-Off The S3 and S5 terminals should be connected to SLP_S3 and SLP_S5 signals respectively. Both VTTREF and VTT are turned on at normal state (S3 = high, S5 = high). VTTREF is kept alive while VTT is turned off and left high impedance in standby state (S3 = low, S5 = high). Both VTT and VTTREF outputs are turned off and discharged to the ground through internal MOSFETs during shutdown state (S5 = low). The control function is showed on the Table 1. VTT SINK/SOURCE REGULATOR The G2997 is a 3A sink/source tracking termination regulator designed specially for low-cost, low external components system where space is at premium such as notebook PC applications. The G2997 integrates high performance low-dropout linear regulator that is capable of sourcing and sinking current up to 3 A. This VTT linear regulator is implemented with ultimately fast response feedback loop so that small ceramic capacitors are enough to keep tracking to the VTTREF within 40mV at all conditions including fast load transient. To achieve tight regulation with minimum effect of trace resistance, a remote sensing terminal, VTTSNS, should be connected to the positive node of VTT output capacitor as a separate trace from the high current line from VTT. Table 1. S3 and S5 Control Table VTTREF REGULATOR The VTTREF block consists of an on-chip 1/2 divider, LPF and buffer. This regulator can source/sink current up to 10mA. Bypass VTTREF to GND using a 0.1µF ceramic capacitor to ensure stable operation. To ensure better start-up and transient performance, the larger 1µF ceramic capacitors are recommended. STATE S3 S5 VTT VREF Normal Hi Hi 1.25V/0.9V 1.25V/0.9V Standby Lo Hi 12mV/6mV (High-Z) 1.25V/0.9V Shutdown Lo Lo Shutdown Hi Lo 0V (Discharge) 0V (Discharge) 0V (Discharge) 0V (Discharge) VTT Current Protection The LDO has a constant overcurrent limit (OCL) at 4A. This trip point is reduced to 2A before the outputvoltage comes within 5% of the target voltage or goes outside of 10% of the target voltage. Power on sequence To operate safely, the G2997 must keep VIN voltage larger than other Input-PIN voltage .This condition is due to the internal parasitic diodes between VIN to others PIN for ESD issue. If the VIN voltage is lower than the other pins voltage, the G2997 will consume extra current through the parasitic diodes during the power-on period. Input Capacitor Adding a capacitance close to VLDOIN pin can improve the VTT performance when fast load- transient. In general, 1/2 COUT is recommended for the VLDOIN capacitance. Separating the VDDQSNS and VLDOIN pins will get better transient performance. The recommended capacitor types are tabulated in the Table 2. Soft-Start The soft-start function of the VTT is achieved via a current clamp, allowing the output capacitors to be charged with low and constant current that gives linear ramp up of the output voltage. The current limit threshold is changed in two stages using an internal powergood signal. When VTT is outside the powergood threshold, the current limit level is 2A. When VTT rises above (VTTREF - 5%) or falls below (VTTREF + 5%) the current limit level switches to 4 A. The thresholds are typically VTTREF 5% (from outside regulation to inside) and 10% (when it falls outside). The soft-start function is completely symmetrical and it works not only from GND to VTTREF voltage, but also from VDDQSNS to VTTREF voltage. Note that the VTT output is in a high impedance state during the S3 state (S3 = low, S5 = high) and its voltage can be up to VDDQSNS voltage depending on the external condition. Note that VTT does not start under a full load condition. 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. The recommended capacitor types are tabulated in the Table 2. Table 2. CAP C1 C2 MANUF TAYO YUDEN TAYO YUDEN PART NUMBER EMK 325BJ106KD UMK 212BJ104KG TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.1 Jul 06, 2006 8 G2997 Global Mixed-mode Technology Inc. Package Information A 10 A e E1 CL E b 1 DETAIL “A” θ2 e A2 0.076 C 0.25 R1 A R GAUGE PLANE SEATING PLANE b A1 D θ1 L θ3 SECTION A-A MSOP-10 Package SYMBOL A A1 A2 b b1 c c1 D E1 e E L θ1 θ2 θ3 R R1 JEDEC MIN. ----0.05 0.81 0.15 0.15 0.13 0.13 2.90 2.90 0.445 0° 0.09 0.09 DIMENSION IN MM NOM. --------0.86 ----0.20 ----0.15 3.00 3.00 0.50 BSC 4.90 BSC 0.55 ----12 REF 12 REF --------- MAX. MIN. 1.10 0.15 0.91 0.30 0.25 0.23 0.18 3.10 3.10 ----0.002 0.032 0.006 0.006 0.005 0.005 0.114 0.114 0.648 6° 0.0175 0° --------- 0.004 0.004 DIMENSION IN INCH NOM. --------0.034 ----0.008 0.006 0.118 0.118 0.020 BSC 0.193 BSC 0.0217 ----12 REF 12 REF --------- MAX. 0.043 0.006 0.036 0.012 0.010 0.009 0.007 0.122 0.122 0.0255 6° --------- MO-187BA TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.1 Jul 06, 2006 9 G2997 Global Mixed-mode Technology Inc. E2 E1 E L D1 D θ A2 c 0.05 e b A A1 MSOP-10 (FD) Package Note:1. JEDEC Outline: MO-187 BA/MO-187 BA-T (Thermally Enhanced Variations Only) 2. Dimension “D” does not include mold flash. Protrusions or gate burrs. Mold flash. Protrusions or gate burrs shall not exceed 0.15 per side. 3. Dimension “E1” does not include interlead flash or protrusion. Interlead flash or protrusion shall not exceed 0.25 per side. 4. Dimension “0.22” does not include dambar protrusion. Allowable dambar protrusion shall be 0.08mm total in excess of the “0.22” dimension at maximum material condition. Dambar cannot be located on the lower radius of the foot. Minimum spac between protrusion and adjacent lead is 0.07mm. 5. Dimensions “D” and “E1” to be determined at datum plane. SYMBOL A A1 A2 b c D D1 E E1 E2 e L θ MIN. DIMENSION IN MM NOM. ----0.00 0.75 0.17 0.08 0.40 0° --------0.85 --------3.00 BSC 1.60 REF 4.90 BSC 3.00 BSC 1.715 REF 0.50 BSC 0.60 ----- MAX. MIN. 1.10 0.15 0.95 0.27 0.23 ----0.000 0.030 0.007 0.003 0.80 8° 0.016 0° DIMENSION IN INCH NOM. --------0.033 --------0.118 BSC 0.063 REF 0.193 BSC 0.118 BSC 0.068 REF 0.002 BSC 0.024 ----- MAX. 0.043 0.006 0.037 0.011 0.009 0.031 8° Taping Specification PACKAGE MSOP-10 MSOP-10 (FD) Q’TY/BY REEL 2,500 ea 2,500 ea F eed D irection T ypical M S O P P ackag e O rientation 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: 1.1 Jul 06, 2006 10