ROHM BD3539FVM Data Sheet
Summary
Master the design of high-speed memory interfaces with these termination regulator ICs. This component offers a linear power solution for DDR1, DDR2, and DDR3 SDRAM, providing robust sink/source current up to 1A while maintaining excellent voltage accuracy. The manual provides comprehensive technical guidance, including operational parameters, absolute maximum ratings, and integration details for dependable use in general-purpose electronic equipment. Ideal for electronics designers requiring reliable and precise power regulation for critical memory subsystems.
Page 1 Text Content
Hi-performance Regulator IC Series for PCs
Termination Regulators for DDR-SDRAMs
BD3539FVM,BD3539NUX No.09030EAT24
Description BD3539FVM/NUX is a termination regulator compatible with JEDEC DDR1-SDRAM, DDR2-SDRAM, DDR3-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 (DDR2, DDR3) or 5.0 volts (DDR1, DDR2, DDR3) 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. Also has a reference power supply output pin (VREF) for DDR-SDRAM or a memory controller. When EN pin turns to “Low”, VTT output becomes “Hi-Z” while VREF output is kept unchanged, compatible with “Self Refresh” state of DDR-SDRAM.
Features 1) Incorporates a push-pull power supply for termination (VTT) 2) Incorporates a reference voltage circuit (VREF) 3) Incorporates an enabler 4) Incorporates an under voltage lockout (UVLO) 5) Employs MSOP8 package : 2.9×4.0×0.9(mm) : BD3539FVM 6) Employs VSON008X2030 package : 2.0×3.0×0.6(mm) : BD3539NUX 7) Incorporates a thermal shutdown protector (TSD) 8) Operates with input voltage from 2.7 to 5.5 volts 9) Compatible with Dual Channel (DDR1, DDR2, DDR3) 10) Usable ceramic capacitor at output
Use Power supply for DDR1- SDRAM (VCC=5V only) Power supply for DDR2-SDRAM (VCC=3.3V or 5V) Power supply for DDR3-SDRAM (VCC=3.3V or 5V)
●ABSOLUTE MAXIMUM RATINGS
Limit
Parameter Symbol Unit
BD3539FVM BD3539NUX
Input Voltage VCC 7 *1*2 V Enable Input Voltage VEN 7 *1*2 V Termination Input Voltage VTT_IN 7 *1*2 V VDDQ Reference Voltage VDDQ 7 *1*2 V Output Current ITT 1 A
Power Dissipation1 Pd1 387.4 *3 242.0
Power Dissipation2 Pd2 587.4 *4 515.0
Power Dissipation3 Pd3 - 877.2 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 With Ta≧25℃ (With no heat sink) θja=322.6℃/W *4 With Ta≧25℃ when mounting a 70mm×70mm×1.6mm glass-epoxy substrate, with no heat sinkθja=212.8℃/W *5 With Ta≧25℃ (With no heat sink) θja=516.5℃/W *6 With Ta≧25℃ when mounting a 70mm×70mm×1.6mm glass-epoxy substrate 1-layer board, θja=242.7℃/W *7 With Ta≧25℃ when mounting a 70mm×70mm×1.6mm glass-epoxy substrate 4-layer board (copper foil density: 5505mm2 (copper foil area in each layer) ), θja=142.5℃/W
www.rohm.com 2009.10 - Rev.A
© 2009 ROHM Co., Ltd. All rights reserved.
Page Summary Contents For ROHM BD3539FVM Data Sheet
Manual Details
| Brand | ROHM |
|---|---|
| Pages | 12 |
| File Size | 433.42 KB |
| Published | June 18, 2026 |
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Frequently Asked Questions
Which DDR SDRAM types are compatible with this regulator IC?
It is compatible with JEDEC DDR1-SDRAM, DDR2-SDRAM, and DDR3-SDRAM.
What is required for the bias power supply voltage?
A 5.0 volts supply is needed for DDR1/DDR2/DDR3, while 3.3 volts suffices for DDR2/DDR3.
How does the circuit behave during a Self Refresh state?
When the EN pin goes low, the VTT output becomes "Hi-Z," but the VREF output remains unchanged.
What is the maximum current capability and load regulation accuracy?
It provides sink/source current up to 1A and features a load regulation of 30mV.