®
RT9089A
DDR Termination Regulator
General Description
The RT9089A is a sink/source tracking termination
regulator. It is specifically designed for low-cost and low-
external component count systems. The RT9089A
possesses a high speed operating amplifier that provides
fast load transient response and only requires a minimum
10μF ceramic output capacitor. The RT9089A supports
remote sensing functions and all features required to power
the DDRI / DDRII / DDRIII and Low Power DDRIII / DDRIV
VTT bus termination according to the JEDEC
specification.
The RT9089A is available in the thermal efficient package,
WDFN-10L 2x2.
Features
VIN Input Voltage Range : 1.1V to 3.5V
VCNTL Input Voltage Range : 2.9V to 5.5V
Support Ceramic Capacitors
10mA Source/Sink Reference Output
Meet DDRI, DDRII JEDEC Spec
Support DDRIII, Low Power DDRIII/DDRIV
VTT
Applications
Soft-Start Function
UVLO and OCP Protection
Thermal Shutdown
Applications
Notebook/Desktop/Server
Telecom/Datacom, GSM Base Station, LCD-TV/PDP-
TV, Copier/Printer, Set-Top Box
Ordering Information
RT9089A
Pin 1 Orientation
***
(2) : Quadrant 2, Follow EIA-481-D
Package Type
QW : WDFN-10L 2x2 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Note :
***Empty means Pin1 orientation is Quadrant 1
Richtek products are :
½
Marking Information
2N : Product Code
2NW
W : Date Code
Pin Configuration
(TOP VIEW)
VDDQSNS
VIN
VOUT
PGND
SENSE
1
2
3
4
5
10
9
8
7
6
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.
11
VCNTL
S5
GND
S3
REFOUT
½
WDFN-10L 2x2
Simplified Application Circuit
RT9089A
V
IN
C3
VDDQSNS
S5
REFOUT
C3
S3
S3
GND
REFOUT
VOUT
SENSE
PGND
C5
S5
V
OUT
VIN
VCNTL
C4
VCNTL
Copyright
©
2017 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS9089A-03 April 2017
GND
www.richtek.com
1
RT9089A
Functional Pin Description
Pin No.
1
2
3
4
5
6
7
9
10
Pin Name
VDDQSNS
VIN
VOUT
PGND
SENSE
REFOUT
S3
S5
VCNTL
Reference input.
Power input of the regulator.
Power output of the regulator.
Power ground of the regulator.
Voltage sense input for the regulator. Connect to positive terminal of the output
capacitor or the load.
Reference output. Connect to GND through a 0.1F ceramic capacitor.
S3 signal input.
S5 signal input.
Control voltage input. Connect this pin to the 3.3V or 5V power supply. A
ceramic decoupling capacitor with a value 4.7F is required.
Analog 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.
Pin Function
8,
GND
11 (Exposed Pad)
Functional Block Diagram
REFOUT
VIN
S3
OTP
S5
VCNTL
VDDQSNS
UVLO
+
-
EN_VTT
+
-
+
OCP
-
PGND
+
OCP
-
VOUT
SENSE
GND
Copyright
©
2017 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
2
DS9089A-03 April 2017
RT9089A
Operation
The RT9089A is a linear sink/source DDR termination
regulator with current capability up to 2A. The RT9089A
builds in a high-side N-MOSFET which provides current
sourcing and a low-side N-MOSFET which provides current
sinking. All the control circuits are supplied by the power
VCNTL. In normal operation, the error amplifier OP adjusts
the gate driving voltage of the power MOSFET to achieve
SENSE voltage well tracking the VDDQSNS/2 voltage.
Both the source and sink currents are detected by the
internal sensing resistor, and the OCP function will work
to limit the current to a designed value when overload
happens. Furthermore, the current will be folded back to
be one half if VOUT is out of the power good window.
Buffer
This function provides REFOUT output equal to
VDDQSNS/2 with 10mA source/sink current capability.
Control Logic
This block includes VCNTL UVLO, VDDQSNS UVLO and
Enable/Disable functions, and provides logic control to
the whole chip.
Power State Control
The input pins S3 and S5 of RT9089A, provide simple
control of the power state. Table 1 describes S3/S5
terminal logic state and corresponding state of REFOUT/
VOUT outputs. VOUT is turn-off and discharged to GND
in state S3. When both S5 and S3 pins are LOW, the
power state is set to S4/S5. In S4/S5 state, all the outputs
are turn-off and discharged to GND.
Thermal Protection
Both the high-side and low-side power MOSFETs will be
turned off when the junction temperature is higher than
typically 160°C, and be released to normal operation when
junction temperature falls below 120°C typically.
Table 1. S3 and S5 Control Table
STATE
S0
S3
S4/S5
S3
HI
LO
LO
S5
HI
HI
LO
REFOUT
ON
ON
OFF (Discharge)
VOUT
ON
OFF (Discharge)
OFF (Discharge)
Copyright
©
2017 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS9089A-03 April 2017
www.richtek.com
3
RT9089A
Absolute Maximum Ratings
(Note 1)
Supply Voltage, VIN, VCNTL -------------------------------------------------------------------------------------------
−0.3V
to 6V
Input Voltage, S3, VDDQSNS, SENSE, S5 ------------------------------------------------------------------------
−0.3V
to 6V
Output Voltage, VOUT, REFOUT --------------------------------------------------------------------------------------
−0.3V
to 6V
Power Dissipation, P
D
@ T
A
= 25°C
WDFN-10L 2x2 ------------------------------------------------------------------------------------------------------------- 1.25W
Package Thermal Resistance (Note 2)
WDFN-10L 2x2,
θ
JA
------------------------------------------------------------------------------------------------------- 80°C/W
WDFN-10L 2x2,
θ
JC
------------------------------------------------------------------------------------------------------- 7°C/W
Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------- 260°C
Junction Temperature ----------------------------------------------------------------------------------------------------- 150°C
Storage Temperature Range --------------------------------------------------------------------------------------------
−65°C
to 150°C
ESD Susceptibility (Note 3)
HBM (Human Body Model) ---------------------------------------------------------------------------------------------- 2kV
(Note 4)
Recommended Operating Conditions
Control Input Voltage, VCNTL ------------------------------------------------------------------------------------------ 2.9V to 5.5V
Supply Input Voltage, VIN ----------------------------------------------------------------------------------------------- 1.1V to 3.5V
Junction Temperature Range --------------------------------------------------------------------------------------------
−40°C
to 125°C
Ambient Temperature Range --------------------------------------------------------------------------------------------
−40°C
to 85°C
Electrical Characteristics
(V
IN
= V
VDDQSNS
= 1.5V, V
CNTL
= 3.3V, V
SENSE
= 0.75V, C
OUT
= 10μF x 1, T
A
= 25°C, unless otherwise specified)
Parameter
Supply Current
VCNTL Supply Current
VCNTL Shutdown
Current
VIN Supply Current
VIN Shutdown Current
Output
Symbol
I
VCNTL
I
SHDN_VCNTL
I
VIN
I
SHDN_VIN
Test Conditions
V
S3
= VCNTL, V
S5
= VCNTL, no load
V
S3
= 0V, V
S5
= 0V, no load
V
S3
= 0V, V
S5
= VCNTL, no load
V
S3
= VCNTL, V
S5
= VCNTL, no load
V
S3
= 0V, V
S5
= 0V, no load
V
IN
= 1.5V, V
VDDQSNS
= 1.5V,
I
OUT
= 0A
Min
--
--
--
--
--
Typ
0.7
65
200
1
0.1
Max
1
80
400
50
50
Unit
mA
A
A
A
A
--
--
--
25
25
25
0.75
0.675
0.6
--
--
--
--
--
--
25
25
25
V
V
V
VOUT Output Voltage
V
OUT
V
IN
= 1.35V, V
VDDQSNS
= 1.35V,
I
OUT
= 0A
V
IN
= 1.2V, V
VDDQSNS
= 1.2V,
I
OUT
= 0A
I
OUT
= ±2A, V
IN
= 1.5V,
V
REFOUT
= 0.75V
VOUT Output Voltage
Offset
V
OUT_OS
I
OUT
= ±2A, V
IN
= 1.35V,
V
REFOUT
= 0.675V
I
OUT
= ±2A, V
IN
= 1.2V,
V
REFOUT
= 0.6V
mV
Copyright
©
2017 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
4
DS9089A-03 April 2017
RT9089A
Parameter
VOUT Source Current Limit
VOUT Sink Current Limit
VOUT Discharge
Resistance
VDDQSNS and REFOUT
VDDQSNS Input Current
VDDQSNS Voltage Range
I
VDDQSNS
V
VDDQSNS
10mA
< I
REFOUT
< 10mA,
V
VDDQSNS
= 1.5V
REFOUT Voltage Tolerance
to V
VDDQSNS
V
TOL_REFOUT
10mA
< I
REFOUT
< 10mA,
V
VDDQSNS
= 1.35V
10mA
< I
REFOUT
< 10mA,
V
VDDQSNS
= 1.2V
REFOUT Source Current
Limit
REFOUT Sink Current Limit
UVLO/S3/S5
UVLO Threshold
S3/S5 Input
Voltage
V
UVLO_VCNTL
Logic-High V
IN_H
Logic-Low
V
IN_L
Shutdown temperature
Hysteresis
Rising
Hysteresis
2.5
--
1.7
--
--
--
2.7
120
--
--
160
15
2.85
--
--
0.3
--
--
V
mV
V
I
LIM_REFOUT_SR
I
LIM_REFOUT_SK
V
REFOUT
= 0V
V
REFOUT
= VDDQSNS / 2 + 1V
V
VDDQSNS
= 1.8V
--
0.5
15
15
12
10
10
30
--
--
--
--
40
40
--
1.8
15
15
12
--
--
mA
mA
mV
A
V
Symbol
I
LIM_VOUT_SR
I
LIM_VOUT_SK
R
DISCHARGE
Test Conditions
VOUT in PGOOD window
VOUT in PGOOD window
V
VDDQSNS
= 0V, V
OUT
= 0.3V,
V
S3
= 0V
Min
2
2
--
Typ
--
--
18
Max
--
--
25
Unit
A
A
Thermal Shutdown
Thermal Shutdown
Threshold
T
SD
°C
Note 1.
Stresses beyond those listed
“Absolute
Maximum Ratings” may cause permanent damage to the device. These are
stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in
the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions may
affect device reliability.
Note 2.
θ
JA
is measured at T
A
= 25°C on a high effective thermal conductivity four-layer test board per JEDEC 51-7.
θ
JC
is
measured at the exposed pad of the package.
Note 3.
Devices are ESD sensitive. Handling precaution is recommended.
Note 4.
The device is not guaranteed to function outside its operating conditions.
Copyright
©
2017 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS9089A-03 April 2017
www.richtek.com
5
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