RT9173C Datasheet, PDF (1/13 Pages) Richtek Technology Corporation – Cost-Effective, 2A Sink/Source Bus Termination Regulator

RT9173C
Cost-Effective, 2A Sink/Source Bus Termination Regulator
General Description
Features
The RT9173C is a simple, cost-effective and high-speed
linear regulator designed to generate termination voltage
in double data rate (DDR) memory system to comply with
the JEDEC SSTL_2 and SSTL_18 or other specific
interfaces such as HSTL, SCSI-2 and SCSI-3 etc. devices
requirements. The regulator is capable of actively sinking
or sourcing up to 2A while regulating an output voltage to
within 40mV. The output termination voltage cab be tightly
regulated to track 1/2V_DDQ by two external voltage divider
resistors or the desired output voltage can be pro-grammed
by externally forcing the REFEN pin voltage.
The RT9173C also incorporates a high-speed differential
amplifier to provide ultra-fast response in line/load transient.
Other features include extremely low initial offset voltage,
excellent load regulation, current limiting in bi-directions
and on-chip thermal shut-down protection.
The RT9173C are available in the SOP-8 (Exposed Pad)
surface mount packages.
Ordering Information
RT9173C
Package Type
SP : SOP-8 (Exposed Pad-Option 1)
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
Note :
Richtek Pb-free and Green products are :
`RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
`Suitable for use in SnPb or Pb-free soldering processes.
`100% matte tin (Sn) plating.
z Ideal for DDR-I, DDR-II and DDR-III V_TT Applications
z Sink and Source 2A Continuous Current
z Integrated Power MOSFETs
z Generates Termination Voltage for SSTL_2,
SSTL _18, HSTL, SCSI-2 and SCSI-3 Interfaces
z High Accuracy Output Voltage at Full-Load
z Output Adjustment by Two External Resistors
z Low External Component Count
z Shutdown for Suspend to RAM (STR) Functionality
with High-Impedance Output
z Current Limiting Protection
z On-Chip Thermal Protection
z Available in SOP-8 (Exposed Pad) Packages
z V_IN and V_CNTL No Power Sequence Issue
z RoHS Compliant and 100% Lead (Pb)-Free
Applications
z Desktop PCs, Notebooks, and Workstations
z Graphics Card Memory Termination
z Set Top Boxes, Digital TVs, Printers
z Embedded Systems
z Active Termination Buses
z DDR-I, DDR-II and DDR-III Memory Systems
Pin Configurations
(TOP VIEW)
VIN
GND
REFEN
VOUT
8
2
7
GND
3
96
4
5
NC
NC
VCNTL
NC
SOP-8 (Exposed Pad)
DS9173C-12 September 2007
www.richtek.com
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