Nano Cap™, QuiCur™, 150mA, Adjustable Output LDO Regulator for Automotive

The BD900N1WG-C is linear regulator using the Nano Cap™ topology designed as low current consumption products for power supplies in various automotive applications requiring a direct connection to the battery. This product is designed for up to 45V as an absolute maximum voltage and to operate until 150mA for the output current with low current consumption 28μA(Typ). This can regulate the output with a very high accuracy ±2.0%.

What is Nano Cap™?
Nano Cap™ is a combination of technologies which allow stable operation even if output capacitance is connected with the range of nF unit.

What is QuiCur™?
QuiCur™ is a combination of technologies that provides high-speed load response.

Product Detail

Part Number | BD900N1WG-CTR
Status | Recommended
Package | SSOP5
Unit Quantity | 3000
Minimum Package Quantity | 3000
Packing Type | Taping
RoHS | Yes
Product Longevity Program | 10 Years

Functional Safety:

Category : FS supportive
A product that has been developed for automotive use and is capable of supporting safety analysis with regard to the functional safety.




Withstand Voltage (Max.)[V]








Vout Type


Vout Accuracy


Circuit Current[mA]


Dropout Voltage (Typ.)[V]


Ripple Rejection [dB]


Load Regulation[mV]

0.1%(Io=0 to 150mA)

Output Capacitor[µF]



Nano Cap™

Shutdown Function


Thermal Shut-down


Over Current Protection


Over Voltage Protection


Under Voltage Lock Out


Discharge Function


Soft Start


Operating Temperature (Min.)[°C]


Operating Temperature (Max.)[°C]


Common Standard

AEC-Q100 (Automotive Grade)

Find Similar


  • Nano Cap™ Topology
  • QuiCur™ Topology
  • AEC-Q100(Grade 1)
  • Automotive grade
  • Over Current Protection(OCP)
  • Thermal Shutdown Protection(TSD)
  • Under Voltage Lock Out(UVLO)

Supporting Information



In recent years, the continuing digitization of all types of equipment has been increasing the number of electronic components, which in turn has been driving the demand to reduce the number of capacitors used for circuit stabilization to shrink both the size and the bill of material (BOM). This requires power supply ICs in power supply circuits that can achieve stable operation with small sized capacitors, but until now it had been difficult to achieve stable operation in applications with output capacitances of 1μF or less.

Key Features of Nano Cap™ Ultra-Stable Control Technology

Operation Comparison: Automotive Primary LDO Regulators

New Product Details

The new BD9xxN1 series of automotive primary LDOs meets the basic requirements of automotive products, such as operation above 125°C, qualification under the AEC-Q100 automotive reliability standard, and input voltages greater than 40V for the primary power supply. Incorporating ROHM’s Nano Cap™ ultra-stable control technology supports an output capacitance of 100nF, which is less than 1/10 of the value of standard products, to ensure stable operation required by applications (output voltage variation within 100mV: condition is 1mA ⇔ 50mA/1μs load current variation) even when the input voltage and load current fluctuate. This makes it possible to provide high performance with a good balance in terms of output capacitance range and response characteristics.

Characteristics Comparison: Automotive Primary LDO Regulators

Application Examples

◇Powertrain (i.e. fuel injection) and tire pressure monitoring systems (TPMS)
◇Body systems (e.g. body control modules)
◇ADAS (e.g. Domain Controllers, ECUs, Zonal processing)
◇AInfotainment including instrument clusters and head-up displays (HUD)
Suitable for a wide range of applications in addition to automotive primary power supply systems.

Support Tools

As a simulation model for verifying these new products, ROHM Real Model is a high accuracy SPICE model that utilizes original model-based technology to faithfully reproduce the electrical and temperature characteristics of the actual IC, resulting in an outstanding match between the IC and simulation values such as “load response” waveform which is difficult to reproduce. This ensures reliable verification, contributing to more efficient application development – for example by preventing rework after prototyping.

ROHM Real Model is now available on ROHM’s website at:

Reference Design / Application Evaluation Kit

    • Reference Design - REF66009
    • LogiCoA™ Solution BUCK Converter (12V Input, 5V Output, 25W)
    • LogiCoA001-EVK-001 is a reference design for a BUCK converter that uses ROHM's analog-digital fusion control technology LogiCoA™, which includes a microcontroller ML62Q2035 suitable for LogiCoA™, a 100V gate driver BD2320EFJ-LA, LDO BD950N1WG-C, BD900N1WG-C, operational amplifier BU7481SG, and shunt resistor LTR100LJZPFSR020. Design data, sample software, and an operating system for power supply control are available for this reference design, as well as a reference board. We hope that you will have a chance to experience the analog-digital fusion control LogiCoA™ and make use of it in your future power supply device development.

      Reference Program

      We offer a reference program comprising an OS for power control and firmware for BUCK converter control. Additionally, we provide a communication GUI that allows communication from a Windows PC. Please utilize these as design references. For inquiries regarding the provision of these, please contact us via the inquiry form on our website.

      • Reference Program: LogiCoA™ Solutions Buck Converter Reference Program
      • Communication GUI (Excel file): LogiCoA™ Solution Back Converter Communication GUI


Most Viewed