Automatically Controlled Buck-Boost Switching Regulator - BD9035AEFV-C

The BD9035AEFV-C is a buck-boost switching controller with a high withstand voltage and a wide input range (VIN=3.8~30V) capable of generating buck-boost output with one inductor. The IC has a ±7% high accuracy switching frequency for the entire operating temperature range (Ta=-40°C~+125°C). Because of the automatically controlled buck-boost system the BD9035AEFV-C also has a higher efficiency compared to regular switching regulators employing Sepic or H-bridge systems.

Part number
Unit Quantity
Minimum Package Quantity
Packing Type
BD9035AEFV-CE2 Active HTSSOP-B24 2000 2000 Taping Yes
Grade Automotive
ch 1
Integrated FET / Controller Controller
Buck / Boost / Buck-Boost / Inverting Buck-Boost
Synchronous / Nonsynchronous Synchronous
Vin1(Min.)[V] 3.8
Vin1(Max.)[V] 30.0
Vout1(Min.)[V] 3.3
Vout1(Max.)[V] 3.7
SW frequency(Max.)[MHz] 0.6
EN Yes
Operating Temperature (Min.)[°C] -40
Operating Temperature (Max.)[°C] 125
  • · Power supply voltage: 40V(maximum rating)
    · Automatically controlled buck-boost system.
    · ±7% High accuracy switching frequency (Ta=-40°C~+125°C).
    · PLL circuit for external synchronization: 100kHz~600kHz
    · Two-stage overcurrent protection through one external resistor.
    · Various protection functions
    · Undervoltage, overvoltage output detection circuit & constant output monitor pin (PGOOD)
    · AEC-Q100 Qualified
Other New/Updated Products Relating to Power Management
PART NUMBER Product Name Package Datasheet Distribution Inventory
BD8303MUV 2.7-14V 1ch Buck-Boost converter (Controller) VQFN016V3030   Buy Sample
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Technical Data
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.

Calculation of Power Loss (Synchronous)

This application note describes how to obtain the power loss required to calculate the temperature of a semiconductor device. Temperature control is important to ensuring product reliability.

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.

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.

Resistor Value Table to set Output Voltage of Buck Converter IC

This Application Note offers reference table to easily set resistor values for output voltage with various internal reference voltages VREF.

PCB Layout Techniques of Buck Converter

Major problems that arise from in appropriate layout may cause increase in noise superposed by output and switching signal, the deterioration of regulator, and also lack of stability...

Snubber Circuit for Buck Converter IC

In buck converter ICs, many high-frequency noises are generated at switch nodes. A snubber circuit provides one way of eliminating such harmonic noise. This application note explains how to set up the RC snubber circuits.

Capacitor Calculation for Buck converter IC

This application note explains the calculation of external capacitor value for buck converter IC circuit.

Inductor Calculation for Buck converter IC

This application note covers the steps required in choosing the inductor and to calculate the value used in buck regulator IC circuits.

Efficiency of Buck Converter

This application note explains power loss factors and methods for calculating them. It also explains how the relative importance of power loss factors depends on the specifications of the switching power source.

The Important Points of Multi-layer Ceramic Capacitor Used in Buck Converter circuit

Using unmatched MLCC may not obtain required target characteristics for power supply circuit and may cause abnormal operation. This application note explains the important points while using MLCC.

Considerations for Power Inductors Used for Buck Converters

This application note explains the features and things to consider when shopping for power inductors.