RT9199
Cost-Effective, 2A Peak Sink/Source Bus Termination Regulator
General Description
The RT9199 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 devices requirements. The regulator is capable of
actively sinking or sourcing up to 2A peak while regulating
an output voltage to within 20mV. The output termination
voltage can 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 RT9199 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 RT9199 are available in both SOP-8 and SOP-8
(Exposed Pad) surface mount packages.
Features
Ideal for DDR-II V
TT
Applications
Sink and Source 2A Peak Current
Integrated Power MOSFETs
Generate Termination Voltage for DDR Memory
Interfaces
High Accuracy Output Voltage at Full-Load
Output Adjustment by Two External Resistors
Low External Component Count
Shutdown for Suspend to RAM (STR) Functionality
with High-Impedance Output
Current Limiting Protection
On-Chip Thermal Protection
RoHS Compliant and 100% Lead (Pb)-Free
Applications
Desktop PCs, Notebooks, and Workstations
Graphics Card Memory Termination
Set Top Boxes, Digital TVs, Printers
Embedded Systems
Active Termination Buses
DDR/II Memory Systems
Ordering Information
RT9199
Package Type
S : SOP-8
SP : SOP-8 (Exposed Pad-Option 2)
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.
Pin Configurations
(TOP VIEW)
VIN
GND
REFEN
VOUT
2
3
4
8
7
6
5
VCNTL
VCNTL
VCNTL
VCNTL
SOP-8
VIN
GND
REFEN
VOUT
2
8
7
GND
3
6
9
4
5
NC
NC
VCNTL
NC
SOP-8 (Exposed Pad)
DS9199-07
September 2007
www.richtek.com
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RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
