NCP5208 Datasheet, PDF (1/10 Pages) ON Semiconductor – DDR-I/II Termination Regulator

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
SO−8 package.
Features
• 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 SO−8 Package
Typical Applications
• DDR Termination Voltage
• Active Bus Termination (SSTL−2, SSTL−3)
2.5 V
VDDQ
VDDQ
SD
AVIN
2.5 V
C_IN
AVIN
PVIN
NCP5208
POK
VTT
VTT
1.25 V,
VFB
1.5 A
C_OUT
http://onsemi.com
8
1
SO−8
D SUFFIX
CASE 751
MARKING
DIAGRAM
8
N5208
ALYW
1
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
PIN CONNECTIONS
POK 1
GND 2
VFB 3
SD 4
8 VTT
7 PVIN
6 AVIN
5 VDDQ
(Top View)
ORDERING INFORMATION
Device
Package
Shipping†
NCP5208DR2
SO−8 2500 Tape & Reel
†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, 2004
1
February, 2004 − Rev. 3
Publication Order Number:
NCP5208/D