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NCV51198 Datasheet

1.5A DDR Memory Termination Regulator

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NCV51198 pdf
NCP51198, NCV51198
1.5A DDR Memory
Termination Regulator
The NCP/NCV51198 is a simple, cost−effective, high−speed linear
regulator designed to generate the VTT termination voltage rail for
DDR−I, DDR−II and DDR−III memory. The regulator is capable of
actively sourcing or sinking up to ±1.5 A for DDR−I, or up to ±0.5 A
for DDR−II /−III while regulating the output voltage to within
±30 mV.
The output termination voltage is tightly regulated to track VTT =
(VDDQ / 2) over the entire current range.
The NCP/NCV51198 incorporates a high−speed differential
amplifier to provide ultra−fast response to line and load transients.
Other features include extremely low initial offset voltage, excellent
load regulation, source/sink soft−start and on−chip thermal shut−down
protection.
The NCP/NCV51198 features the power−saving Suspend To Ram
(STR) function which will tri−state the regulator output and lower the
quiescent current drawn when the /SS pin is pulled low.
The NCP/NCV51198 is available in a SOIC−8 Exposed Pad
package.
Features
Generate DDR Memory Termination Voltage (VTT)
For DDR−I, DDR−II, DDR−III Source / Sink Currents
Supports DDR−I to ±1.5 A, DDR−II to ±0.5 A (peak)
Integrated Power MOSFETs with Thermal Protection
Stable with 10 mF Ceramic VTT Capacitor
High Accuracy Output Voltage at Full−Load
Minimal External Component Count
Shutdown for Standby or Suspend to RAM (STR) mode
Built−in Soft Start
NCV Prefix for Automotive and Other Applications Requiring
Unique Site and Control Change Requirements; AEC−Q100
Qualified and PPAP Capable
These are Pb−Free Devices
Appications
Desktop PC’s, Notebooks, and Workstations
Graphics Card DDR Memory Termination
Set Top Boxes, Digital TV’s, Printers
Embedded Systems
Active Bus Termination
www.onsemi.com
MARKING
DIAGRAM
8
1
SOIC8−NB EP
PD SUFFIX
CASE 751BU
XXXXXX
AYWWG
G
XXXXXX = Specific Device Code
A = Assembly Location
Y = Year
WW = Work Week
G = Pb−Free Package
PIN CONNECTION
1
GND
8
/SS
VTTS
VREF
SOIC−8 EP
VTT
PVCC
VCC
VDDQ
ORDERING INFORMATION
See detailed ordering, marking and shipping information in the
package dimensions section on page 8 of this data sheet.
© Semiconductor Components Industries, LLC, 2015
April, 2015 − Rev. 3
1
Publication Order Number:
NCP51198/D


  ON Semiconductor Electronic Components Datasheet  

NCV51198 Datasheet

1.5A DDR Memory Termination Regulator

No Preview Available !

NCV51198 pdf
NCP51198, NCV51198
1.5 A, DDR−I /−II /−III TERMINATION REGULATOR
Figure 1. Typical Application Schematic
PIN FUNCTION DESCRIPTION – NCP51198
Pin Number
SO8−EP
Pin Name
Pin Function
1
GND
Common Ground.
2 /SS Suspend Shutdown supports Suspend To RAM function. CMOS compatible input sets VTT output to
high impedance state. Logic HI = Enable, Logic LO = Shutdown.
3
VTTS
VTTS is the VTT sense input.
4
VREF
VREF is an output pin that provides the buffered output of the internal reference voltage equal to half of
VDDQ. Two resistors dividing down the VDDQ voltage on the pin to create the regulated output voltage.
5
VDDQ
The VDDQ pin is an input pin for creating the internal reference voltage to regulate VTT. The VDDQ volt-
age is connected to an internal resistor divider. The central tap of resistor divider (VDDQ /2) is con-
nected to the internal voltage buffer, which output is connected to VREF pin and the non−inverting input
of the error amplifier as the reference voltage.
6 VCC Power for the analog control circuitry.
7
PVCC
The PVCC pin provides the rail voltage from where the VTT pin draws load current. There is a limitation
between VCC and PVCC. The PVCC voltage must be less or equal to the VCC voltage to ensure the
correct output voltage regulation. The VTT source current capability is dependent on PVCC voltage. The
higher the voltage on PVCC, the higher the source current.
8 VTT Regulator output voltage capable of sinking and sourcing current while regulating the output rail.
THERMAL Pad for thermal connection. The exposed pad must be connected to the ground plane using multiple
PAD
vias for maximum power dissipation performance.
www.onsemi.com
2


Part Number NCV51198
Description 1.5A DDR Memory Termination Regulator
Maker ON Semiconductor
Total Page 9 Pages
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