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  Richtek Technology Electronic Components Datasheet  

RT9040 Datasheet

DDR Termination Regulator

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®
RT9040
DDR Termination Regulator
General Description
The RT9040 is a sink/source tracking termination regulator.
It is specifically designed for low-cost and low-external
component count systems. The RT9040 possesses a high
speed operating amplifier that provides fast load transient
response and only requires a minimum 20μF of ceramic
output capacitance. The RT9040 supports remote sensing
functions and all features required to power the DDRI /
DDRII / DDRIII and Low Power DDRIII VTT bus termination
according to the JEDEC specification. In addition, the
RT9040 provides an open drain PGOOD signal to monitor
the output regulation and an EN signal that can be used
to discharge VTT during S3 (suspend to RAM) for DDR
applications .
The RT9040 is available in the thermal efficient WDFN-
10L 3x3 package.
Ordering Information
RT9040 (2)
Pin 1 Orientation
(2) : Quadrant 2, Follow EIA-481-D
Package Type
QW : WDFN-10L 3x3 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Z : ECO (Ecological Element with
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.
Features
VIN Input Voltage Range : 1.1V to 3.5V
VCNTL Input Voltage Range : 2.375V to 5.5V
MLCC Stable
PGOOD to Monitor Output Regulation
±10mA Reference (REFOUT)
Meet DDRI, DDRII JEDEC Spec Supports DDRIII, Low
Power DDRIII VTT Application
Soft Start Function UVLO and OCP
UVLO and OCP Protection
Thermal Shutdown
RoHS Compliant and Halogen Free
Application
Notebook/Desktop/Server
Telecom/Datacom, GSM Base Station, LCD-TV/PDP-
TV ,Copier/Printer, Set-Top Box
Pin Configurations
(TOP VIEW)
REFIN 1
VIN 2
VOUT 3
PGND 4
SENSE 5
10 VCNTL
9 PGOOD
8 GND
7 EN
11 6 REFOUT
WDFN-10L 3x3
Marking Information
RT9040GQW(2)
G4=YM
DNN
G4= : Product Code
YMDNN : Date Code
RT9040ZQW(2)
G4 YM
DNN
G4 : Product Code
YMDNN : Date Code
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS9040-04 January 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT9040 Datasheet

DDR Termination Regulator

No Preview Available !

RT9040
Typical Application Circuit
RT9040
VIN
REFOUT
2 VIN
R1
10k 1 REFIN
C1
10µF x 2 R2 C2
10k 1nF
C3
0.1µF
Chip Enable
6 REFOUT
7 EN
VCNTL 10
PGOOD 9
VOUT 3
SENSE 5
PGND 4
R3
100k
VCNTL
C4 2.5V/3.3V/5V
4.7µF
Power Good Indicator
VOUT
C5
10µF x 3
GND 8, 11 (Exposed Pad)
Functional Pin Description
Pin No.
Pin Name Pin Function
1
REFIN
Reference Input.
2 VIN Supply Voltage for the LDO.
3
VOUT
Power Output for the LDO.
4
PGND
Power Ground Output for the LDO.
5
SENSE
Voltage Sense Output for the LDO. Connect to positive terminal of the output
capacitor or the load.
6 REFOUT Reference Output. Connect to GND through 0.1uF ceramic capacitor.
7 EN
8,
11 (Exposed Pad)
GND
9 PGOOD
10 VCNTL
Chip Enable. For DDR VTT application, connect EN to SLP_S3. For any other
application(s), use EN as the ON/OFF function.
Signal Ground. Connect to negative terminal of the output capacitor. The exposed
pad must be soldered to a large PCB and connected to GND for maximum power
dissipation.
PGOOD Output. Indicates regulation. Connect to an internal open drain
N-MOSFET.
2.5V, 3.3V or 5V power supply. A ceramic decoupling capacitor with a value
between 1F and 4.7F is required.
Function Block Diagram
EN VCNTL
REFIN
Control
Logic
Thermal
Protection
VIN
REFOUT
PGOOD
GND
Buffer
+
OCP
-
-
+OP
Power
Good
Driver
+
OCP
-
SENSE
VOUT
PGND
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS9040-04 January 2014


Part Number RT9040
Description DDR Termination Regulator
Maker Richtek
PDF Download

RT9040 Datasheet PDF






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