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NCP5208
DDR−I/II Termination
Regulator
The NCP5208 is a linear regulator specifically designed for the
active termination of DDR−I/II SDRAM. The device can be operated
from a single supply voltage as low as 1.7 V. For DDR−I
applications, the device is capable of sourcing and sinking current up
to 1.5 A with the output voltage regulated to within
"3%
or better. A
separate voltage feedback pin ensures superior load regulation
against load and line changes.
Protective features include soft−start, source/sink current limits
and thermal shutdown. Open−drain VTT OK output (POK) is added
for system monitoring. The shutdown pin can tri−state the regulator
output for Suspend To RAM (STR) state. This device is available in a
SOIC−8 package.
Features
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1
SOIC−8
D SUFFIX
CASE 751
MARKING DIAGRAM
8
N5208
ALYW
G
1
•
•
•
•
•
•
•
•
•
•
•
•
Supports Both DDR−I and DDR−II SDRAM Requirements
Single Supply Voltage Operation as Low as 1.7 V
Integrated Power MOSFETs
Few External Components Needed
Source and Sink Current Up to 1.5 A
Load Regulation Within
"3%
Both Source and Sink Current Limits
Open−Drain VTT OK (POK) Pin
Shutdown Pin
Thermal Shutdown
Housed in SOIC−8 Package
Pb−Free Package is Available
A
L
Y
W
G
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
PIN CONNECTIONS
Typical Applications
•
DDR Termination Voltage
•
Active Bus Termination (SSTL−2, SSTL−3)
POK 1
GND 2
VFB 3
SD
4
(Top View)
8
7
6
5
VTT
PVIN
AVIN
VDDQ
VDDQ
2.5 V
VDDQ
AVIN
SD
ORDERING INFORMATION
Device
Package
SOIC−8
SOIC−8
(Pb−Free)
Shipping
†
2500/T
ape & Reel
2500/T
ape & Reel
NCP5208
POK
AVIN
PVIN
C
IN
VTT
VFB
VTT
1.25 V,
1.5 A
C
OUT
NCP5208DR2
NCP5208DR2G
2.5 V
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specifications
Brochure, BRD8011/D.
GND
Figure 1. Typical Application Circuit
©
Semiconductor Components Industries, LLC, 2006
1
May, 2006 − Rev. 5
Publication Order Number:
NCP5208/D
NCP5208
VDDQ
VDDQ
AVIN
R
−
M0
EN
SD
+
−
EN
R/50
AVIN
C
OUT
M1
R
EN
VFB
VTT
+
VTT
POK
AVIN
AVIN
PVIN
PVIN
GND
Figure 2. Simplified Functional Block Diagram
PIN FUNCTION DESCRIPTION
Pin
1
2
3
4
5
6
7
8
Symbol
POK
GND
VFB
SD
VDDQ
AVIN
PVIN
VTT
Open−drain VTT Power OK output
Ground
Remote sensing Feedback pin for regulating VTT
Active low shutdown pin to tri−state VTT output, this pin is pulled high internally
Reference input for VTT regulator
Analog supply input, this powers all the internal control circuitry
Power supply input, this provides the rail voltage for the VTT output
Termination Regulator output
Description
MAXIMUM RATINGS
Rating
AVIN, PVIN, VDDQ, VFB, VTT to GND
Input/Output Pins
Open Drain Output Pins
Thermal Characteristics
SOIC−8 Package − Thermal Resistance, Junction−to−Air
Operating Junction Temperature Range
Operating Ambient Temperature Range
Storage Temperature Range
SD
POK
Symbol
−
V
IO
V
POK
R
qJA_T
T
J
T
A
T
stg
Value
−0.3, 6.0
−0.3, 6.0
−0.3, 6.0
151
−10 to +150
0 to +70
−55 to +150
Unit
V
V
V
°C/W
°C
°C
°C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
1. This device series contains ESD protection and exceeds the following tests:
Human Body Model (HBM)
v2.0
kV per JEDEC standard: JESD22–A114.
Machine Model (MM)
v200
V per JEDEC standard: JESD22–A115.
2. Latchup Current Maximum Rating:
"150
mA per JEDEC standard: JESD78.
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2
NCP5208
ELECTRICAL CHARACTERISTICS
(AVIN = 2.5 V, PVIN = 2.5 V, VDDQ = 2.5 V, C
OUT
= 220
mF,
for typical values T
A
= 25°C, for
min/max values T
A
= 0 to 70°C, unless otherwise noted.)
Characteristic
Analog Supply Input
Power Supply Input
Termination Voltage Output
Conditions
−
−
AVIN = 2.5 V, VDDQ = PVIN = 1.8 V
IVTT = –0.6 A to +0.6 A
AVIN = PVIN = VDDQ = 2.5 V
IVTT = –1.5 A to 1.5 A
Load Regulation
VDDQ = 1.8 V, IVTT = 0 to +0.6 A
VDDQ = 1.8 V, IVTT = 0 to –0.6 A
VDDQ = 2.5 V, IVTT = 0 to +1.5 A
VDDQ = 2.5 V, IVTT = 0 to –1.5 A
Analog Current Consumption
VDDQ Input Impedance
VFB Feedback Pin Input Current
SHUTDOWN CONTROL
Shutdown Pin Enable Threshold
Shutdown Pin Hysteresis
Shutdown Pin Input Current
−
−
VDDQ = 2.5 V, VSD = 0 V
VDDQ = 2.5 V, VSD = 2.5 V
VDDQ = 2.5 V, VSD = 5.5 V
VDDQ = 2.5 V, VSD = 0 V
VSD
VSDhys
ISD
1.14
0.40
−15
−
−
−
1.24
0.55
−
−
−
−
1.34
0.68
−
10
12
15
V
V
mA
No Load
−
(Note 3)
IAVIN
ZVDDQ
IVFB
DVTT
Symbol
AVIN
PVIN
VTT
1.215
−
−18
−
−20
−
−
−
1.250
−
−
−
−
−
50
−
1.285
15
−
20
−
10
−
20
V
mV
mV
mA
kW
nA
Min
1.7
1.7
0.870
Typ
−
−
0.900
Max
5.5
AVIN
0.930
Unit
V
V
V
Shutdown Analog Supply Current
VTT POWER OK INDICATOR
VTT Power OK Window Low Threshold
VTT Power OK Window High Threshold
POK Pull−LOW Resistance
POK Leakage Current
OVER CURRENT PROTECTION
Source Current Limit
Sink Current Limit
OVER TEMPERATURE PROTECTION
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
Ishut
mA
(Note 4)
(Note 4)
IPOK = 5.0 mA
VDDQ = 2.5 V, VPOK = 6.0 V
POKLth
POKHth
RPOKL
IPOKleak
−
−
7.0
−
VDDQ
×
(1/2−0.02)
VDDQ
×
(1/2+ 0.02)
−
−
−
−
20
0.1
V
V
W
mA
−
−
ILIMsrc
ILIMsnk
1.65
−2.9
2.1
−2.0
2.9
−1.65
A
A
(Note 3)
(Note 3)
TSD
TSDhys
120
−
135
30
150
−
°C
°C
3. Values are not tested in production, guaranteed by design only.
4. Production test performed for AVIN = PVIN = VDDQ = 2.5 V only, 1.8 V performance guaranteed by design.
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3
NCP5208
TYPICAL OPERATING CHARACTERISTICS
0.950
AV
IN
= 2.5 V
PV
IN
= V
DDQ
= 1.8 V
T
A
= 25°C
1.300
AV
IN
= 2.5 V
PV
IN
= V
DDQ
= 2.5 V
T
A
= 25°C
VTT, Output Voltage (V)
0.925
VTT, Output Voltage (V)
0.8
1.275
0.900
1.250
0.875
1.225
0.850
−0.8
0.4
−0.6 −0.4
−0.2
0
0.2
0.6
IVTT, OUTPUT LOAD CURRENT (A)
1.200
−1.8
−1.4 −1.0 −0.6 −0.2 0.2
0.6 1.0 1.4
IVTT, OUTPUT LOAD CURRENT (A)
1.8
Figure 3. VTT Output Voltage vs. Load Current
(V
DDQ
= 1.8 V)
VTT, Source Current Load Regulation (mV)
0
−2
−4
−6
−8
−10
−12
−14
−16
−18
−20
0
PV
IN
= V
DDQ
, = AV
IN
= 2.5 V
10
60
20
30
40
50
T
A
, AMBIENT TEMPERATURE (°C)
70
V
DDQ
= 2.5 V, IVTT = 1.5 A
V
DDQ
= 1.8 V, IVTT = 0.6 A
Figure 4. VTT Output Voltage vs. Load Current
(V
DDQ
= 2.5 V)
20
18
16
14
12
10
8
6
4
2
0
0
10
60
20
30
40
50
T
A
, AMBIENT TEMPERATURE (°C)
70
V
DDQ
= 1.8 V, IVTT = 0.6 A
V
DDQ
= 2.5 V, IVTT = 1.5 A
PV
IN
= V
DDQ
, = AV
IN
= 2.5 V
Figure 5. Source Current Load Regulation vs.
Ambient Temperature
VTT, Sink Current Load Regulation (mV)
Figure 6. Sink Current Load Regulation vs.
Ambient Temperature
2.5
I
LIM
, Over Current Protection Limit (A)
Source Current
2.0
Sink Current
1.5
I
AVIN
, Analog Input Current (mA)
10
PV
IN
= AV
IN
= V
DDQ
= 2.5 V
IVTT = 0 A
8
6
1.0
4
0.5
PV
IN
= AV
IN
= V
DDQ
= 2.5 V
0
0
10
20
30
40
50
60
T
A
, AMBIENT TEMPERATURE (°C)
70
2
0
0
10
20
30
40
50
60
T
A
, AMBIENT TEMPERATURE (°C)
70
Figure 7. Over Current Protection Limit vs.
Ambient Temperature
Figure 8. Analog Input Current vs. Ambient
Temperature
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