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  Richtek Technology Electronic Components Datasheet  

RT9005A Datasheet

(RT9005A / RT9005B) DDR VDDQ and Termination Voltage Regulator

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Preliminary
RT9005A/B
DDR VDDQ and Termination Voltage Regulator
General Description
The RT9005A/B is a dual-output linear regulator for DDR-
SDRAM VDDQ supply and termination voltage VTT supply.
The Regulator is capable of actively sinking or sourcing
up to 2A. The output termination voltage can be tightly
regulated to track 1/2 VDDQ by two external voltage divider
resistors.
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Ordering Information
RT9005
Package Type
SP : SOP-8 (Exposed Pad-Option 2)
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
VOUT1 Output Voltage
A : 2.5V
B : 1.8V
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.
Features
z Ideal for DDR-I and DDR-II VDDQ, VTT Applications
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 VOUT2 Sink and Source 2A Continuous Current
z VOUT2 Adjustment by Two External Resistors
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 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 and DDR-II Memory Systems
Pin Configurations
(TOP VIEW)
BP
VIN1
VIN2
VCNTL
8
2
3
GND
9
7
6
45
VOUT1
GND
VOUT2
VREFEN
SOP-8 (Exposed Pad)
DS9005A/B-01 September 2007
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT9005A Datasheet

(RT9005A / RT9005B) DDR VDDQ and Termination Voltage Regulator

No Preview Available !

RT9005A/B
Preliminary
Typical Application Circuit
www.DataSheet4U.com
VIN1
VOUT1
2N7002
EN
CIN1
2.2uF CBP
10nF
2
VIN1
1 BP
3
VIN2
VCNTL 4
8 VOUT1
R1
COUT1
2.2uF
RT9005A/B
VOUT2 6
5 VREFEN
R2
CSS
1uF
GND
7,
Exposed Pad(9)
VIN2
4C7IN02uF
VCTNL = 3.3V
CVCNTL
47uF RTT
COUT2
470uF
GND
Note : If there is any application need to use 10μF ceramic capacitor in front of RTT, please shut one 1000μF (Aluminum
eletrolytic capacitor).
Functional Pin Description
Pin No.
Pin Name
Pin Function
1 BP
7,
Exposed Pad (9) GND
2 VIN1
Noise Reduction. Connecting a 10nF capacitor to GND to reduce output noise.
Common Ground (T he exposed pad must be soldered to a large PCB and
connected to GND for maximum power dissipation). The GND pad are a should be
as large as possible and using many vias to conduct the heat into the buried GND
plate of PCB layer.
Linear Regulator Power Input Voltage.
Input voltage which supplies current to the output pin. Connect this pin to a
well-decoupled supply voltage. To prevent the input rail from dropping during large
3
VIN2
load transient, a large, low ESR capacitor is recommended to use. The capacitor
should be placed as close as possible to the VIN2 pin.
VCNTL supplies the internal control circuitr y and provides the drive voltage. The
driving capability of output current is proportioned to the VCNTL. Connect this pin
4
VCNTL
to 3.3V bias supply to handle large output current with at least 10uF capacitor from
this pin to GND.
Reference voltage input and active low VOUT2 shutdown control pin. Two resistors
5 VREFEN dividing down the VIN voltage on the pin to create the regulated output voltage.
Pulling the pin to ground turns off the device by an open-drain, such as 2N7002,
signal N-MOSFET.
Regulator Output. VOUT2 is regulated to REFEN voltage that is used to terminate
the bus resistors. It is capable of sinking and sourcing current while regulating the
6 VOUT2 output rail. To maintain adequate large signal transient response, typical value of
1000μF AL electrolytic capacitor with 10μF ceramic capacitors are recommended to
reduce the effects of current transients on VOUT.
8 VOUT1 Regulator 2.5V/1.8/1.5V Output.
www.richtek.com
2
DS9005A/B-01 September 2007


Part Number RT9005A
Description (RT9005A / RT9005B) DDR VDDQ and Termination Voltage Regulator
Maker Richtek Technology
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RT9005A Datasheet PDF






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1 RT9005A (RT9005A / RT9005B) DDR VDDQ and Termination Voltage Regulator
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2 RT9005B (RT9005A / RT9005B) DDR VDDQ and Termination Voltage Regulator
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