BD3531F - Documentation
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.
For Automotive usage, please contact Sales.
Application Note
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Basics of Linear Regulators
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A linear regulator, also referred to as a "three-terminal regulator" or "dropper," is a power supply long known to many designers owning to its simple circuitry and ease of use...
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Linear Regulator Specifications
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Very important information such as maximum ratings, operating conditions and characteristic graphs are described in the table.
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Reverse Voltage Protection
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A linear regulator integrated circuit (IC) is a DC-to-DC buck converter system that reduces a DC supply from higher voltage level to a lower voltage level...
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Power Source ON/OFF Characteristics for Linear Regulator
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When a linear regulator IC is turned ON, the electric charge is stored in the output capacitor and the output voltage increases up to the specified value.
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Thermal Calculation for Linear Regulator
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This application note explains how to estimate the junction temperature of the IC chip, and provides calculation examples for the ROHM’s standard circuit boards.
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Simple Test Method for Estimating the Stability of Linear Regulators
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Low drop-out (LDO) regulators developed back in the age when large-capacitance multi-layer ceramic capacitors (hereinafter, MLCCs) were uncommon cause a phase delay, leading to oscillation when connected to a low-ESR capacitor like an MLCC...
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Connecting LDOs in Parallel
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Provides some hints on how to connect LDOs in parallel.
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Problem Situations: Power Supply Does Not Start
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Although linear regulators can be used to easily configure power supplies, the linear regulators may cause startup problems depending on the type of loads. This application note introduces cases where the power supplies do not start correctly in the linear regulators.
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Power Supply Sequence Circuit with General Purpose Power Supply IC
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This application note proposes a circuit that accomplishes the power supply sequence without using any dedicated power supply sequence IC, by using general purpose power supply ICs.
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Suppression Method of Switching Noise Using Linear Regulator and Low Pass Filter
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This application note describes the method and result of the ripple and switching noise suppression using a linear regulator and a low pass filter.
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Measurement Method for Phase Margin with Frequency Response Analyzer (FRA)
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This application note introduces a method for easily measuring the phase margin with a Frequency Response Analyzer (FRA) made by NF Corporation.
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BAxxCC0 Series Circuit Using a Ceramic Output Capacitor
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This application note proposes a circuit using an output ceramic capacitor that allows a stable phase compensation.
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Importance of Probe Calibration When Measuring Power: Deskew
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Even when devices used for measurement are calibrated regularly, they will give incorrect results if calibration is not perfo rmed for the measurement environment. This application note explains the importance of probe calibration in power measurement environments.
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Thermal Resistance
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The definition and how to use thermal resistance and thermal characterization parameter of packages for ROHM’s integrated circuit are described in this application note.
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Impedance Characteristics of Bypass Capacitor
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This application note focuses on the impedance characteristics of capacitors, and explains cautions for selecting bypass capacitors.
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Package Ordering Unit
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For ICs
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