4.5-5.5V 1ch Nch FET LDO Controllers - BD3520FVM

This IC is an ultra-low dropout linear regulator controller for chipset that can achieve ultra-low voltage input to ultra-low voltage output. By using N-MOSFET for external power transistor, the controller can be used at ultra-low I / O voltage difference up to voltage difference generated by ON resistance. In addition, because best suited power transistor can be chosen in accord with the output current, downsizing and cost reduction of the set can be achieved. Because by reducing the I / O voltage difference, large current output is achieved and conversion loss can be reduced, switching power supply can be replaced. This IC does not need any choke coil, diode for rectification and power transistor which are required for switching power supply, total cost of the set can be reduced and compact size can be achieved for the set. In addition, since voltage output start-up time can be adjusted by using the NRCS terminal, it is possible to flexibly meet the power supply sequence of the set.

* This product is a STANDARD grade product and not recommend for on-vehicle devices.
número de peça
Estado de Condição
Quantidade Unidade
Quantidade mínima Package
tipo de embalagem
BD3520FVM-TR Active MSOP8 3000 3000 Taping sim
Grade Standard
Breakdown Voltage(Max.)[V] 7.0
ch 1
Vin(Min.)[V] 4.5
Vin(Max.)[V] 5.5
Vin 2ch[V] Vo+(IoMax. x Ron)
Vout (Typ.) [V] 1.2
Vout Precision ±1.0
Thermal Shut-down Latch
Under Voltage Lock Out Yes
Soft Start Variable
Additional Feature Timer Latch Protection
Operating Temperature (Min.)[°C] -10
Operating Temperature (Max.)[°C] 100
  • ・Reduced rush current by NRCS
    ・Built-in driver for external Nch h transistor
    ・Adoption of MSOP8 package : 2.9 x 4.0 x 0.83 (mm)
    ・Built-in timer latch short protection circuit
    ・Built-in low input maloperation prevention circuit
    ・Output voltage Fix type
    ・Built-in overheat protection circuit
Outros Novo / Atualizado produtos em relação aPower Management
Número de peça Nome do Produto Pacote Datasheet Inventário de distribuição
BD3521FVM 4.5-5.5V 1ch Nch FET LDO Controllers MSOP8   comprar
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Table of resistance for output voltage setting on linear regulator Ics

This application notes provide tables for each series so that it is easy to set the resistance value for the output voltage setting from various internal reference voltages VREF.

Thermal Resistance

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.

Basics of Linear Regulators

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...

Linear Regulator Specifications

Very important information such as maximum ratings, operating conditions and characteristic graphs are described in the table.

Reverse Voltage Protection

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...

Simple Test Method for Estimating the Stability of Linear Regulators

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...

Thermal Calculation for Linear Regulator

The loss in linear regulators increases as the difference between the input and output voltages increases. Since most of the loss is converted to heat, a very large amount of heat may be generated in some conditions...

Power Source ON/OFF Characteristics for Linear Regulator

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.

BAxxCC0 Series Circuit Using a Ceramic Output Capacitor

This application note proposes a circuit using an output ceramic capacitor that allows a stable phase compensation.

Measurement Method for Phase Margin with Frequency Response Analyzer (FRA)

This application note introduces a method for easily measuring the phase margin with a Frequency Response Analyzer (FRA) made by NF Corporation.

Connecting LDOs in Parallel

Provides some hints on how to connect LDOs in parallel.