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Global Mixed-mode Technology

G2992 Datasheet Preview

G2992 Datasheet

3A DDR Bus Termination Regulator

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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 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
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 opera-
tional 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 con-
sumption can meet the low power consumption appli-
cations. 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 advan-
tage can be obtained in this mode through lowering
the quiescent current to 50μA @ VCNTL = 3.3V.
Ordering Information
ORDER
NUMBER
MARKING
TEMP.
RANGE
G2992F1U G2992 -40°C to +85°C
Note: U: Tape & Reel
(FD): Thermal Pad
PACKAGE
(Pb free)
SOP-8 (FD)
Pin Configuration
Typical Application Circuit
G2992
VIN 1
8 NC
GND 2
7 NC
VREF 3
VOUT 4
SOP-8(FD)
6 VCNTL
5 NC
VCNTL=3.3V
VIN=2.5V
2N7002
EN
R1 VIN VCNTL
VREF
VOUT
R2 CSS
GND
CIN CCNTL
RTT
COUT RDUMMY
Ver: 1.0
Aug 29, 2006
TEL: 886-3-5788833
http://www.gmt.com.tw
1




Global Mixed-mode Technology

G2992 Datasheet Preview

G2992 Datasheet

3A DDR Bus Termination Regulator

No Preview Available !

www.DataSheet4U.com
Global Mixed-mode Technology Inc.
G2992
Absolute Maximum Ratings (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)
Recommend Operation Range (3)
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.
(2) : Human body model : C = 100pF, R = 1500Ω, 3 positive pulses plus 3 negative pulses.
(3) :VIN and VREF mustnt be higher than VCNTL.
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
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=½VIN
|IVTT|<1.5A,VREF=½VIN
|IVTT|<3A, VREF =½VIN
IOUT=0A
VREF<0.2V
3.3VVCNTL5.5V
Output active
Output disable
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
µA
µA
A
°C
°C
V
V
Ver: 1.0
Aug 29, 2006
TEL: 886-3-5788833
http://www.gmt.com.tw
2


Part Number G2992
Description 3A DDR Bus Termination Regulator
Maker Global Mixed-mode Technology
Total Page 7 Pages
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