AP1270AMP Datasheet, PDF (1/5 Pages) Advanced Power Electronics Corp. – 2.5A SINK/SOURCE BUS TERMINATION REGULATOR

Advanced Power
Electronics Corp.
AP1270AMP
2.5A SINK/SOURCE BUS TERMINATION REGULATOR
FEATURES
Ideal for DDR-I, DDR-II and DDR-III V_TT Applications
Sink and Source up to 2.5Amp
Integrated Power MOSFETs
Generates Termination Voltage for SSTL_2, SSTL_18,
HSTL, SCSI-2 and SCSI-3 Interfaces.
High Accuracy Output Voltage at Full-Load
Output Adjustment by Two External Resistors
Built-in Soft-start Function
Shutdown for Suspend to RAM (STR) Functionality
with High-Impedance Output
Current Limiting Protection
On-Chip Thermal Protection
Available in ESOP-8 Packages
V_IN and V_CNTL Under Voltage Protection
RoHS Compliant and Halogen Free Product
APPLICATION
Desktop PCs, Notebooks, and Workstations
Graphics Card Memory Termination
Set Top Boxes, Digital TVs, Printers
Embedded Systems
Active Termination Buses
DDR-I, DDR-II and DDR-III Memory Systems
DESCRIPTIOON
The AP1270AMP is a simple, cost-effective and
high-speed linear regulator designed to generate
termination voltage in double data rate (DDR) memory
system to comply with the JEDEC SSTL_2 and
SSTL_18 or other specific interfaces such as HSTL,
SCSI-2 and SCSI-3 etc. devices requirements. The
regulator is capable of actively sinking or sourcing up to
2.5A while regulating an output voltage to within 40mV.
The output termination voltage cab be tightly regulated
to track 1/2V_DDQ by two external voltage divider resistors
or the desired output voltage can be pro-grammed by
externally forcing the REFEN pin voltage.
The AP1270AMP also incorporates a high-speed
differential amplifier to provide ultra-fast response in
line/load transient. Other features include extremely low
initial offset voltage, excellent load regulation, current
limiting in bi-directions and on-chip thermal shut-down
protection.Built-in softstart function avoids a
misoperation by inrush current.
The AP1270AMP are available in the ESOP-8
surface mount packages.
TYPICAL APPLICATION
VIN
CIN
Shutdown
VIN
VCNTL
R1
AP1270AMP
REFEN VOUT
R2
CSS
GND
VCNTL
CCNTL
RTT
VOUT
COUT
RDUMMY
Enable
R1 = R2 = 100 KΩ , RTT = 50Ω / 33Ω / 25Ω
COUT = 10uF ( + 100 uF under the worst case testing condition )
CSS = 1uF , CIN = 470 uF (Low ESR) , CCNTL = 47uF
Data and specifications subject to change without notice
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20130617V3.1