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BD3531F-E2 Fiches technique(PDF) 1 Page - Rohm

No de pièce BD3531F-E2
Description  Termination Regulator for DDR-SDRAMs
Download  19 Pages
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Fabricant  ROHM [Rohm]
Site Internet  http://www.rohm.com
Logo ROHM - Rohm

BD3531F-E2 Fiches technique(HTML) 1 Page - Rohm

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○Product structure:Silicon monolithic integrated circuit ○This product has no designed protection against radioactive rays
1/15
© 2015 ROHM Co., Ltd. All rights reserved.
www.rohm.com
TSZ22111・14・001
TSZ02201-0J2J0A900950-1-2
02.Nov.2015 Rev.001
Termination Regulator for DDR-SDRAMs
BD3531F
General Description
BD3531F is a termination regulator that complies with
JEDEC requirements for DDR-SDRAM. This linear
power supply uses a built-in N-channel MOSFET and
high-speed OP-AMPS specially designed to provide
excellent transient response. It has a sink/source
current capability up to 1.5A and has a power supply
bias requirement of 5.0V for driving the N-channel
MOSFET. By employing an independent reference
voltage input (VDDQ) and a feedback pin (VTTS), this
termination regulator provides excellent output voltage
accuracy and load regulation as required by JEDEC
standards. Additionally, BD3531F has a reference
power supply output (VREF) for DDR-SDRAM or for
memory controllers. Unlike the VTT output that goes to
“Hi-Z” state, the VREF output is kept unchanged when
EN input is changed to “Low”, making this IC suitable
for DDR-
SDRAM under “Self Refresh” state.
Features
Incorporates
a
Push-Pull
Power
Supply
for
Termination (VTT)
Incorporates a Reference Voltage Circuit (VREF)
Incorporates an Enabler
Incorporates an Undervoltage Lockout (UVLO)
Incorporates a Thermal Shutdown Protector (TSD)
Compatible with Dual Channel (DDR-II)
Applications
Power supply for DDR I/II - SDRAM
Key Specifications
Termination Input Voltage Range:
1.0V to 5.5V
VCC Input Voltage Range:
4.5V to 5.5V
Output Voltage:
1/2xVVDDQ V(Typ)
Output Current:
1.5A(Max)
High Side FET ON-Resistance:
0.4
Ω(Typ)
Low side FET ON-Resistance:
0.4Ω(Typ)
Standby Current:
0.8mA (Typ)
Operating Temperature Range:
-10°C to +100°C
Package
W(Typ) x D(Typ) x H(Max)
Typical Application Circuit, Block Diagram
SOP8
5.00mm x 6.20mm x 1.71mm
TSD
Reference
Block
Thermal
Protection
GND
VREF
VDDQ
½ x
VTTS
VTT
VTT
VCC
VDDQ
VTT_IN
VCC
VDDQ
VTT_IN
VCC
UVLO
50k
Ω
50k
Ω
VCC
VCC
UVLO
VCC
TSD
EN
UVLO
TSD
EN
UVLO
Enable
EN
Datasheet
Datasheet


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