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Global Mixed-mode Technology Inc.
G2992
3A DDR Bus Termination Regulator
Features
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 20F 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
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 750A @ 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 50A @ VCNTL = 3.3V.
Applications
DDR-SDRAM Termination Voltage DDR I / DDR II Termination Voltage SSTL-18 SSTL-2 SSTL-3
Ordering Information
ORDER MARKING NUMBER
G2992F1U G2992 Note: U: Tape & Reel (FD): Thermal Pad
TEMP. RANGE
-40C to +85C
PACKAGE (Pb free)
SOP-8 (FD)
Pin Configuration
Typical Application Circuit
G2992
VIN GND
1 2 8 7 6 5
VCNTL=3.3V NC NC VCNTL NC 2N7002 EN VIN=2.5V R1 VIN VREF R2 CSS VCNTL VOUT GND COUT RDUMMY CIN CCNTL RTT
VREF 3 VOUT 4 SOP-8(FD)
Ver: 1.0 Aug 29, 2006
TEL: 886-3-5788833 http://www.gmt.com.tw
1
Global Mixed-mode Technology Inc.
Absolute Maximum Ratings
(1)
G2992
Recommend Operation Range (3)
Operating Ambient Temperature Range TA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40C to +85C VCNTL to GND. . . . . . . . . . . . . . . . . . . . . . 3.3V to 5.5V VIN to GND. . . . . . . . . . . . . . . . . . . . . . . . 1.8V to 3.6V VREF to GND . . . . . . . . . . . . . . . . . . . . . . . .0 to VCNTL
Supply Voltage VCNTL to GND. . . . . . . . . . . . . . . . . . . . . . -0.3V to +7V Maximum Junction Temperature, TJ. . . . . . . . 150C Storage Temperature Range, TSTG. . -65C to+150C Reflow Temperature (soldering, 10sec) . . . . . . 260C Thermal Resistance Junction to Ambient, (JA) SOP-8 (FD). . . . . . . . . . . . . . . . . . . . . . . . . . ..50C/W Electrostatic Discharge, VESD Human body mode. . . . . . . . . . . . . . . . . . . . . 2000V(2)
Note:
(1) (2)
: Absolute maximum rating indicates limits beyond which damage to the device may occurs. : Human body model : C = 100pF, R = 1500, 3 positive pulses plus 3 negative pulses. (3) :VIN and VREF mustn't be higher than VCNTL.
Electrical Characteristics
Specifications with standard typeface are for TA=25C, VIN=2.5V, VCNTL=3.3V, VREF=1.25V, COUT=20F. Unless otherwise specified. PARAMETER
Output Offset Voltage VTT output voltage VTT Output Voltage Load Regulation (DDR I/DDR II) Input Voltage Range (DDR I/DDR II) Control Voltage Range (DDR I/DDR II) Quiescent Current Quiescent Current in Shutdown Current Limit Thermal Shutdown Temperature Thermal Shutdown Hysteresis Shutdown High Trigger Level Output Shutdown Low Trigger Level Output
SYMBOL
VOS VTT VTT VIN VCNTL ICNTL ISD ILIMIT TTS THYS VIH VIL
CONDITIONS
(DDR I/DDR II) IVTT=0, VREF=1/2VIN |IVTT|<1.5A,VREF=1/2VIN |IVTT|<3A, VREF =1/2VIN
MIN
-20 ---20 -30 -40 1.8 ------3 ----0.8 ---
TYP
0 1.25/0.9 ------2.5/1.8 3.3 750 50 --160 20 -----
MAX
20 --20 30 40 3.6 5.5 1500 90 --------0.2
UNIT
mV V mV V V A A A C C V V
IOUT=0A VREF<0.2V 3.3VVCNTL5.5V Output active Output disable
Ver: 1.0 Aug 29, 2006
TEL: 886-3-5788833 http://www.gmt.com.tw
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Global Mixed-mode Technology Inc.
Typical Performance Characteristics
G2992
CCNTL=1F/MLCC/X5R, CIN=22F/MLCC/X7R, CSS=1F/MLCC/X5R, COUT=20F/X5R/MLCC unless otherwise noted.
VOUT is Shorted to GND
VCNTL=5.0V,VIN=2.5V
VOUT is Shorted to 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
5.6 5.4 5.2 3.9 4
Sourcing Current Limit vs Temperature
Sourcing Current Limit (A)
5 4.8 4.6 4.4 4.2 4 3.8 3.6 3.4 3.2
Sourcing Current Limit (A)
3.8
VCNTL=3.3V,VIN=2.5V
3.7 3.6 3.5 3.4 3.3
VCNTL=3.3V,VIN=1.8V
VCNTL=5.5V,VIN=1.8V
VCNTL=5.5V,VIN=2.5V
-40
-20
0
20
40
60
80
100
120
-40
-20
0
20
40
60
80
100
120
Temperature (C)
Temperature (C)
Ver: 1.0 Aug 29, 2006
TEL: 886-3-5788833 http://www.gmt.com.tw
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Global Mixed-mode Technology Inc.
Typical Performance Characteristics (continued)
G2992
Sinking Current Limit vs Temperature
Sinking Current Limit vs Temperature
4.4 4.3 4.2 4.4 4.3 4.2
Sinking Current Limit (A)
4.1 4 3.9 3.8 3.7 3.6 3.5 3.4 3.3 3.2
Sinking Current Limit (A)
VCNTL=5.5V,VIN=1.8V
4.1 4 3.9 3.8 3.7 3.6 3.5 3.4 3.3 3.2
VCNTL=5.5V,VIN=2.5V
VCNTL=3.3V,VIN=1.8V
VCNTL=3.3V,VIN=2.5V
-40
-20
0
20 40 60 80 Temperature (C)
100
120
-40
-20
0
20
40
60
80
100
120
Temperature (C)
VREF Shutdown Threshold vs Temperature
0.8 1.2 1.15
VCNTL Supply Current vs Vout Load Current
VREF Shutdown Threshold (V)
VCNTL Supply Current (mA)
0.7 0.6 0.5 0.4 0.3 0.2
VCNTL=5.0V,VIN=1.8V
1.1 1.05 1 0.95 0.9 0.85 0.8
VCNTL=5V
VCNTL=3.3V
-40
-20
0
20 40 60 Temperature (C)
80
100
120
-2
-1.5
-1
-0.5
0
0.5
1
1.5
2
VOUT Load Current (A)
RDS(ON) vs Temperature
0.18 0.17 0.16
RDS(ON) vs Temperature
0.16
VIN=0.9V VIN=0.85V RDS(ON) ()
0.15 0.14 0.13 0.12 0.11
VIN=0.9V VIN=0.85V
RDS(ON) ()
0.15 0.14 0.13 0.12 0.11 0.1
VIN=0.8V
VIN=0.8V VCNTL=5.0V
VCNTL=3.3V
0.1 0.09
-40
-20
0
20
40
60
80
100
120
-40
-20
0
Temperature (C)
20 40 60 80 Temperature (C)
100
120
Ver: 1.0 Aug 29, 2006
TEL: 886-3-5788833 http://www.gmt.com.tw
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Global Mixed-mode Technology Inc.
Typical Performance Characteristics (continued)
G2992
VCNTL Supply Current vs. VCNTL Supply Voltage
1
VCNTL Supply Current vs Temperature
1 0.95 VCNTL Supply Current (mA) VCNTL Supply Current (mA) 0.9 0.85 0.8 0.75 0.7 0.65 -40 -20 0 20 40 60 80 100 120 Temperature (C)
0.95 0.9 0.85 0.8 0.75 0.7 0.65 3.3 3.6
TA=120C
TA=25C
VCNTL=5.0V,VIN=2.5V
TA=0C
3.9
4.2 4.5 4.8 5.1 5.4 VCNTL Supply Voltage (V)
5.7
6
VCNTL Shutdown Current vs Temperature
62 60 VCNTL Shutdown Current (A) 58 56 54 52 50 48 46 -40 -20 0 20 40 60 Temperature (C) 80 100 120 VCNTL Shutdown Current (A) 69 66 63 60 57 54 51 48 45 3.3
VCNTL Shutdown Current vs VCNTL Supply Voltage
TA=120C
TA=25C
VCNTL=5.0V,VIN=2.5V
TA=0C
3.6 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
1.2 1 Dropout Voltage (V) 0.8 0.6 0.4 0.2 0
0 0.5 1 1.5 2 2.5 3 Output Current (A)
Recommended Minimum Footprint SOP-8 (FD)
VREF=0.9V VCNTL=3.3V TA=25C TA=75C TA=125C
TA=-50C
Ver: 1.0 Aug 29, 2006
TEL: 886-3-5788833 http://www.gmt.com.tw
5
Global Mixed-mode Technology Inc.
Pin Description
PIN
1 2 3 4 5,7,8 6
G2992
NAME
VIN GND VREF VOUT NC VCNTL Terminator Power pin. Ground
FUNCTION
Terminator reference input voltage, 1.25V for DDR I, 0.9V for DDR II. Below 0.2V, the chip will be shutdown. Terminator output pin (VTT voltage supplied) No Connection Internal circuit power pin, at least 3.3V
Block Diagram
VCNTL
VIN
Shutdown
VREF
+
VOUT
GND
Application Information
Output Capacitor For stable operation, total capacitance of the VTT output terminal can be equal or greater than 20F. The output capacitor should be located near VTT output terminal as close as possible to minimize the effect of ESR and ESL. 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. Consideration of the VREF Voltage The VREF voltage is applied by a buffered mid-rail 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. 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. A ceramic capacitance with a value between 1.0F and 4.7F close to the VCNTL pin is recommended to stabilize the VCNTL voltage.
Ver: 1.0 Aug 29, 2006
TEL: 886-3-5788833 http://www.gmt.com.tw
6
Global Mixed-mode Technology Inc.
Package Information
D1
G2992
0.008TYP
E1
E
H
L D 0.015x45
A2 0.004MAX. B A1
A
SEATING PLANE
e
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 E e H L D1 E1
MIN.
1.35 0.00 -----
DIMENSION IN MM MAX.
1.75 0.13 1.50 0.41TYP 4.98 3.99 1.27TYP 6.20 1.27 8 2.29 2.29
DIMENSION IN INCH MIN. MAX.
0.053 0.000 ----0.016TYP 0.189 0.150 0.05TYP 0.228 0.016 0 --------0.244 0.050 8 0.090 0.090 0.196 0.157 0.069 0.005 0.059
4.80 3.81 5.80 0.41 0 ---------
Taping Specification
PACKAGE
SOP-8 (FD)
Feed Direction Typical SOP Package Orientation
Q'TY/REEL
2,500 ea
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.
Ver: 1.0 Aug 29, 2006
TEL: 886-3-5788833 http://www.gmt.com.tw
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