RT9026
DDR Termination Regulator
General Description
RT9026 is a 3A sink/source tracking termination regulator.
It is specifically designed for low-cost and low-external
component count systems. The RT9026 possesses a high
speed operating amplifier that provides fast load transient
response and only requires 20µF of ceramic output
capacitance. The RT9026 supports remote sensing
functions and all features required to power the DDRI/II/III
and low-power DDRIII/DDRIV VTT bus termination
according to the JEDEC specification. In addition, the
RT9026 includes integrated sleep-state controls placing
VTT in High-Z in S3 (suspend to RAM) and soft-off for VTT
and VTTREF in S5 (shutdown). The RT9026 is available
in the thermal efficient package SOP-8 (Exposed Pad),
MSOP-10 (Exposed Pad) and WDFN-10L 3x3.
Features
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Applications
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DDRI/II/III and Low-Power DDRIII/DDRIV Memory
Termination
SSTL-2, SSTL-18
HSTL Termination
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Ordering Information
RT9026
Package Type
SP : SOP-8 (Exposed Pad-Option 1)
FP : MSOP-10 (Exposed Pad)
QW : WDFN-10L 3x3 (W-Type)
Lead Plating System
P : Pb Free
G : Green (Halogen Free and Pb Free)
Note :
Richtek products are :
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Support DDRI, DDRII, DDRIII, Low-Power DDRIII and
DDRIV Requirement
}
Source/Sink 3A for DDRI and DDRII
}
Source/Sink 2A for DDRIII
}
Source/Sink 1.5A for Low-Power DDRIII
}
Source/Sink 1.2A for Low-Power DDRIV
Input Voltage Range : 3.15V to 5.5V
VLDOIN Voltage Range : 1.2V to 3.3V
Requires Only 20µF Ceramic Output Capacitance
Supports High-Z in S3 and Soft-Off in S5
Integrated Divider Tracks 1/2 VDDQSNS for Both VTT
and VTTREF
Remote Sensing (VTTSNS)
±20mV
Accuracy for VTT and VTTREF
10mA Buffered Reference (Sourcing/Sinking)
(VTTREF)
Built-In Soft-Start
Over Current Protection
Thermal Shutdown Protection
SOP-8 (Exposed Pad), MSOP-10 (Exposed Pad) and
10-Lead WDFN Package
RoHS Compliant and Halogen Free
Pin Configurations
(TOP VIEW)
GND
S3
VTTSNS
VTTREF
2
8
7
GND
3
6
9
4
5
VTT
VLDOIN
VIN
VDDQSNS
SOP-8 (Exposed Pad)
VDDQSNS
VLDOIN
VTT
PGND
VTTSNS
10
2
3
4
5
9
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.
GND
8
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11 7
6
VIN
S5
GND
S3
VTTREF
MSOP-10 (Exposed Pad)
WDFN-10L 3x3
DS9026-07
September 2011
www.richtek.com
1
9
VDDQSNS
VLDOIN
VTT
PGND
VTTSNS
1
2
3
4
5
GND
11
10
9
8
7
VIN
S5
GND
S3
VTTREF
RT9026
Marking Information
RT9026PSP
RT9026PSP : Product Code
RT9026PFP
A0- : Product Code
YMDNN : Date Code
YMDNN : Date Code
RT9026
PSPYMDNN
A0-YM
DNN
RT9026GSP
RT9026GSP : Product Code
RT9026GFP
A0= : Product Code
YMDNN : Date Code
RT9026
GSPYMDNN
A0=YM
DNN
YMDNN : Date Code
RT9026PQW
E6- : Product Code
E6-YM
DNN
YMDNN : Date Code
RT9026GQW
E6= : Product Code
E6=YM
DNN
YMDNN : Date Code
Typical Application Circuit
RT9026
VLDOIN
C1
10µF
3.3V or 5V
C2
1µF
7
VTTREF 4
5
VDDQSNS
3
VTTSNS
6 VIN
8
VTT
2 S3
S3
GND
1, 9 (Exposed Pad)
VLDOIN
VLDOIN
VTTREF
C3
0.1µF
C4
10µF x 2
VTT
VTT
C4
10µF x 2
C1
10µF
RT9026
1 VDDQSNS VIN 10
2
VLDOIN
GND
3 VTT
VTTREF
5 VTTSNS
S5
4 PGND
S3
3.3V or 5V
C2
1µF
8, 11 (Exposed Pad)
6
9
7
S5
S3
C3
0.1µF
VTTREF
Figure 1. For SOP-8 (Exposed Pad) Package
Figure 2. For MSOP-10 (Exposed Pad) / WDFN-10L 3x3
Package
Functional Pin Description
Pin No.
Pin Name
Pin Function
RT9026
□
FP
RT9026
□
SP
RT9026
□
QW
Ground. The exposed pad must be soldered to a large PCB and
1,
8,
GND
connected to GND for maximum power dissipation.
9 (Exposed Pad) 11 (Exposed Pad)
2
3
7
5
S3
VTTSNS
Active Low Suspend to RAM Mode Control Pin, VTT is turned
off and left High-Z, VTTREF is active.
VTT Voltage Sense Input Pin. Connect to plus terminal of the
output capacitor.
To be Continued
www.richtek.com
2
DS9026-07
September 2011
RT9026
Pin No.
RT9026
□
FP
RT9026
□
SP
RT9026
□
QW
4
5
6
7
8
--
--
6
1
10
2
3
4
9
Pin Name
VTTREF
Buffered output
VDDQSNS/2.
that
Pin Function
is
a
reference
output,
equal
to
VDDQSNS VLDOIN Sense Input Pin.
VIN
VLDOIN
VTT
PGND
S5
Analog Input Pin (to control loop).
Power supply of the VTT and VTTREF output stage (to power
MOS).
Output voltage for connection to termination resistors, equal to
VDDQSNS/2.
Power Ground of the VTT Output.
Active low shutdown control pin, both VTT and VTTREF are
turned off and discharged to ground.
Function Block Diagram
VDDQSNS
+
-
GND
VIN
+
-
ENVTT
S3
5V(10%)
+
S5
ENREF
+
-
PGOOD
+
+
-
-5V(10%)
VTTSNS
PGND
ENVTT
Half DDQ
+
-
VLDOIN
VTTREF
ENREF
+
2.32V/
2.2V
-
VIN OK
VTT
Table 1. S3 and S5 Control Table
State
Normal
Standby
Shutdown
Shutdown
S3
High
Low
Low
High
S5
High
High
Low
Low
VTT
VREF
1.25V/0.9V/0.75V 1.25V/0.9V/0.75V
/0.675V/0.6V
/0.675V/0.6V
12mV/6mV
1.25V/0.9V/0.75V
(High-Z)
/0.675V/0.6V
0V (Discharge)
0V (Discharge)
0V (Discharge)
0V (Discharge)
DS9026-07
September 2011
www.richtek.com
3
RT9026
Absolute Maximum Ratings
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(Note 1)
Supply Input Voltage, VIN ---------------------------------------------------------------------------------------------- 6V
Supply Input Voltage, VLDOIN, VDDQSNS ------------------------------------------------------------------------ 3.6V
Power Dissipation, P
D
@ T
A
= 25°C
SOP-8 (Exposed Pad) -------------------------------------------------------------------------------------------------- 1.333W
MSOP-10 (Exposed Pad) ---------------------------------------------------------------------------------------------- 1.163W
WDFN-10L 3x3 ----------------------------------------------------------------------------------------------------------- 1.429W
Package Thermal Resistance (Note 2)
SOP-8 (Exposed Pad),
θ
JA
-------------------------------------------------------------------------------------------- 75°C/W
SOP-8 (Exposed Pad),
θ
JC
-------------------------------------------------------------------------------------------- 28°C/W
MSOP-10 (Exposed Pad),
θ
JA
---------------------------------------------------------------------------------------- 86°C/W
MSOP-10 (Exposed Pad),
θ
JC
---------------------------------------------------------------------------------------- 30°C/W
WDFN-10L 3x3,
θ
JA
------------------------------------------------------------------------------------------------------ 70°C/W
WDFN-10L 3x3,
θ
JC
----------------------------------------------------------------------------------------------------- 8.2°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 Mode) --------------------------------------------------------------------------------------------- 2kV
MM (Machine Mode) ---------------------------------------------------------------------------------------------------- 200V
(Note 4)
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Recommended Operating Conditions
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Supply Input Voltage, VIN ---------------------------------------------------------------------------------------------- 3.15V to 5.5V
Supply Input Voltage, VLDOIN, VDDQSNS ------------------------------------------------------------------------ 1.2V to 3.3V
Junction Temperature Range ------------------------------------------------------------------------------------------
−
40°C to 125°C
Ambient Temperature Range ------------------------------------------------------------------------------------------
−
40°C to 85°C
Electrical Characteristics
(V
IN
= 5V, VLDOIN = VDDQSNS = 2.5V, C1=10µF, C2=1µF, C3=0.1µF, C4=10µFx2, T
A
= 25°C, S5 function only for RT9026PFP
and RT9026PQW, unless otherwise specified)
Parameter
Symbol
Test Conditions
V
IN
= 5V, No Load, S5 = S3 = 5V
V
IN
= 5V, No Load, S5 = 5V, S3 = 0V
V
IN
= 5V, No Load, S5 = S3 = 0V
(Only for RT9026PFP and RT9026PQW)
V
IN
= 5V, No Load, S5 = S3 = 5V
V
IN
= 5V, No Load, S5 = 5V, S3 = 0V
Min
--
--
--
--
--
--
--
--
--
--
--
Typ
--
--
--
--
--
--
--
--
1.25
0.9
0.75
Max
2
300
1
2
10
1
50
1
--
--
--
Unit
mA
µA
µA
mA
µA
µA
µA
µA
V
VIN (to control loop) Supply
I
VIN
Current
VIN Standby Current
VIN Shutdown Current
VLDOIN (to power MOS)
Supply Current
VLDOIN Standby Current
I
VINSTB
I
VINSHDN
I
VLDOIN
I
VLDOINSTB
VLDOIN Shutdown Current I
VLDOINSHDN
V
IN
= 5V, No Load, S5 = S3 = 0V
VDDQSNS Input Current
I
VDDQSNS
V
IN
= 5V, S5 = S3 = 5V
VTTSNS Input Current
VTT Output Voltage
I
VTTSNS
VTT
V
IN
= 5V, S5 = S3 = 5V
VDDQSNS = VLDOIN = 2.5V
VDDQSNS = VLDOIN = 1.8V
VDDQSNS = VLDOIN = 1.5V
To be Continued
www.richtek.com
4
DS9026-07
September 2011
RT9026
Parameter
VTT Output Voltage
Symbol
VTT
Test Conditions
VDDQSNS = VLDOIN = 1.35V
VDDQSNS = VLDOIN = 1.2V
VDDQSNS = VLDOIN =
2.5V/1.8V/1.5V/1.35V/1.2V,
∣I
VTT
∣=
0A
VTTREF, VTT Output
Tolerance
V
VTTTOL
VDDQSNS = VLDOIN = 1.2V,
∣I
VTT
∣=
1.2A
VDDQSNS = VLDOIN =
2.5V/1.8V/1.5V/1.35V,
∣I
VTT
∣=
1.5A
VDDQSNS = VLDOIN = 2.5V/1.8V,
∣I
VTT
∣=
3A
VTT = 0V
VTT = VDDQSNS
VDDQSNS = 0V, VTT = 1.25V,
S5 = S3 = 0V
V
VTTREF
=
V
VDDQSNS
2
Min
--
--
−20
−40
−40
−40
3
3
10
--
−20
20
--
--
1.6
--
--
--
--
Typ
0.675
0.6
--
--
--
--
4
4
17
1.25/0.9/
0.75/
0.675/0.6
--
40
--
0.2
--
--
--
160
20
Max
--
--
20
40
mV
40
40
--
--
--
--
A
A
mA
V
Unit
V
VTT Source Current Limit
VTT Sink Current Limit
VTT Discharge Current
VTTREF Output Voltage
VDDQSNS/2, VTTREF
Output Voltage Tolerance
I
VTTOCLsr
I
VTTOCLsk
I
DSCHRG
V
VTTREF
VLDOIN = VDDQSNS =
V
VTTREFTOL
2.5V/1.8V/1.5V/1.35V/1.2V,
I
VTTREF
< 10mA
Rising
20
60
2.7
mV
mA
V
VTTREF Source Current Limit I
VTTREFOCL
V
VTTREF
= 0V
UVLO Threshold Voltage
Logic-High
Input Voltage
Logic-Low
Logic Input Leakage Current
V
UVLO
Hysteresis
V
IH
V
IL
I
ILK
S5, S3 pin
S5, S3 pin
S5, S3 pin
--
--
V
0.4
1
--
--
µA
°C
°C
Thermal Shutdown Protection T
SD
Thermal Shutdown Hysteresis
∆T
SD
Note 1.
Stresses listed as the above
“Absolute
Maximum Ratings” may cause permanent damage to the device. These are for
stress ratings. 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 for extended
periods may remain possibility to affect device reliability.
Note 2.
θ
JA
is measured in the natural convection at T
A
= 25°C on a high effective four-layers thermal conductivity test board of
JEDEC 51-7 thermal measurement standard. The case point of
θ
JC
is on the exposed pad for SOP-8 (Exposed Pad)
, MSOP-10 (Exposed Pad) and WDFN-10L 3x3 package.
Note 3.
Devices are ESD sensitive. Handling precaution is recommended.
Note 4.
The device is not guaranteed to function outside its operating conditions.
DS9026-07
September 2011
www.richtek.com
5
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