4.3-5.5V 2.5A 1ch LDO - BD3506F

The BD3506F is an ultra-low dropout linear regulator for chipset that can achieve ultra-low voltage input to ultra-low voltage output. By using N-MOS FET for built-in power transistor, the regulator can be used at ultra-low I / O voltage difference up to voltage difference generated by ON resistor (RON = 120 m?). Because by reducing the I / O voltage difference, large current (Iomax = 2.5A) output is achieved and conversion loss can be reduced, switching power supply can be replaced. BD3506F 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. Using external resistors, optional output from 0.65V to 2.5V can be set. In addition, since voltage output start-up time can be adjusted by using the NRCS terminal, it is possible to meet the power supply sequence of the set.

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* This product is a STANDARD grade product and not recommend for on-vehicle devices.
Part number
Unit Quantity
Minimum Package Quantity
Packing Type
BD3506F-E2 Active SOP8 2500 2500 Taping Yes
Grade Standard
Breakdown Voltage(Max.)[V] 7.0
ch 1
Vin(Min.)[V] 4.3
Vin(Max.)[V] 5.5
Vin 2ch[V] 1.2 to Vcc-1
Vout (Typ.) [V] 0.65 to 2.5
Vout Precision ±1.0
Iout(Max.)[A] 2.5
Thermal Shut-down Recover
Over Current Protection Yes
Under Voltage Lock Out Yes
Soft Start Variable
Operating Temperature (Min.)[°C] -10
Operating Temperature (Max.)[°C] 100
  • ・Built-in high-accuracy reference voltage circuit (0.65V±1%)
    ・Built-in VCC low input maloperation prevention circuit (Vcc = 4.15V)
    ・Reduced rush current by NRCS
    ・Built-in ultra-low on-resistor (120 mΩ typ) Nch Power MOSFET
    ・Built-in current limiting circuit (2.5A min)
    ・Built-in thermal shutdown circuit
    ・Output variable type (0.65-2.5V)
    ・Adoption of SOP8 package (BD3506F) : 5.0 x 6.2 x 1.5 (mm)
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Technical Data
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

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Basics of Linear Regulators

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Linear Regulator Specifications

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

Reverse Voltage Protection

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Simple Test Method for Estimating the Stability of Linear Regulators

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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

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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.