RT9045A Datasheet, PDF (1/11 Pages) Richtek Technology Corporation – The RT9045A is a simple

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RT9045A
Cost-Effective, 1.8A Sink/Source Bus Termination Regulator
General Description
The RT9045A 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 1.8A while regulating
an output voltage to within 20mV. The output termination
voltage can be tightly regulated to track V_DDQ / 2 by two
external voltage divider resistors or the desired output
voltage can be programmed by externally forcing the
REFEN pin voltage.
The RT9045A 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 shutdown protection.
Ordering Information
RT9045A
Package Type
SP : SOP-8 (Exposed Pad-Option 2)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Note :
Richtek 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.
Marking Information
RT9045A
GSPYMDNN
RT9045AGSP : Product Number
YMDNN : Date Code
Features
 Ideal for DDR V_TT Applications
 Sink and Source Current :
 DDRII 1.8A Sink/Source @ V_IN = 1.8V
 DDRIII 1.5A Sink/Source @ V_IN = 1.5V
 LPDDRIII 1.2A Sink/Source @ V_IN = 1.35V
 DDRIV 1.2A Sink/Source @ V_IN = 1.2V
 Integrated Power MOSFETs
 Generate Termination Voltage for DDR Memory
Interfaces
 Stable with Output Ceramic Capacitor
 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
Applications
 Desktop PCs, Notebooks, and Workstations
 Graphics Card Memory Termination
 Set Top Boxes, Digital TVs, Printers
 Embedded Systems
 Active Termination Buses
 DDR Memory Systems
Pin Configurations
(TOP VIEW)
VIN
GND
REFEN
VOUT
8
2
7
3
GND
9
6
4
5
NC
NC
VCNTL
NC
SOP-8 (Exposed Pad)
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
DS9045A-00 January 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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