BD35390FJ Datasheet, PDF (1/11 Pages) Rohm – Termination Regulator for DDR-SDRAMs

Hi-performance Regulator IC Series for PCs
Termination Regulator
for DDR-SDRAMs
BD35390FJ
No.09030EAT25
●Description
BD35390FJ is a termination regulator compatible with JEDEC DDR1/2/3-SDRAM, which functions as a linear power supply
incorporating an N-channel MOSFET and provides a sink/source current capability up to 1A respectively. A built-in
high-speed OP-AMP specially designed offers an excellent transient response. Requires 3.3 volts or 5.0 volts as a bias
power supply to drive the N-channel MOSFET. Has an independent reference voltage input pin (VDDQ) and an
independent feedback pin (VTTS) to maintain the accuracy in voltage required by JEDEC, and offers an excellent output
voltage accuracy and load regulation.
●Features
1) Incorporates a push-pull power supply for termination (VTT)
2) Incorporates an enabler
3) Incorporates an under voltage lockout (UVLO)
4) Employs SOP-J8 package : 3.9×4.9×1.375(mm)
5) Incorporates a thermal shutdown protector (TSD)
6) Operates with input voltage from 2.7 to 5.5 volts
7) Compatible with Dual Channel (DDR1, DDR2, DDR3)
8) Incorporates PGOOD function
●Use
Power supply for DDR1/2/3 SDRAM
●Absolute Maximum Ratings
Parameter
Input Voltage
Enable Input Voltage
Termination Input Voltage
VDDQ Reference Voltage
Output Current (when pulse is active^*3)
Power Dissipation1
Power Dissipation2
Symbol
VCC
VEN
VTT_IN
VDDQ
ITT
Pd1
Pd2
Limit
7 ^*1*2
7 ^*1*2
7 ^*1*2
7 ^*1*2
1^*1
563^*4
675^*5
Operating Temperature Range
Topr
-30～+100
Storage Temperature Range
Tstg
-55～+150
Maximum Junction Temperature
Tjmax
+150
*1 Should not exceed Pd.
*2 Instantaneous surge voltage, back electromotive force and voltage under less than 10% duty cycle.
*3 Voltage under less than 10u sec.
*4 Reduced by 4.50℃/W for each increase in Ta of 1℃ over 25℃ (when don’t mounted on a heat radiation board)
*5 Reduced by 5.40℃/W for each increase in Ta of 1℃ over 25℃ (when mounted on a 70mm×70mm×1.6mm glass epoxy board)
Unit
V
V
V
V
A
mW
mW
℃
℃
℃
●Operating Conditions(Ta=25℃)
Parameter
Input Voltage
Termination Input Voltage
VDDQ Reference Voltage
Enable Input Voltage
Limit
Symbol
MIN
MAX
Unit
VCC
2.7
5.5
V
VTT_IN
1.0
5.5
V
VDDQ
1.0
2.75
V
VEN
-0.3
5.5
V
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2009.10 - Rev.A