Low quiescent current DCDCs for Automotive

Synchronous Buck Converters

Low quiescent current DCDCs for Automotive

ROHM's BD9901x Family is a synchronous buck converter series that integrates low resistances MOSFETs. It achieves a continuous output current of 2A over a wide input supply range. The SLLMTM (Simple Light Load Mode) control ensures an ultra low quiescent current and high efficiency at low load situation as well as a high efficiency at high load situations while maintaining a regulated output voltage. The product is compliant with automotive standards and accommodates a maximum voltage of 42V. The minimum input voltage is 3.6 V in order to sustain output at cold cranking conditions. The current mode regulation loop gives a fast transient response and easy phase compensation.


  • Input Voltage Range: 3.6V to 42V
  • Output Voltage: 3.3V or 5.0V
  • Output Current: 2.0A
  • Switching Frequency: 200 to 500kHz (typ.)
  • High Efficiency
  • Low Quiescent Current: typ. 22μA over temperature range (-40 ~ 105°C)
  • Integrated Power MOSFETs for synchronous rectification (High side p-type and low side n-type)
  • Integrated Feedback Resistors
  • Fixed Soft Start Time (typ. 6ms)
  • Int. Protection Function: OCP, SCP, TSD, UVLO, OVP
Synchronous Buck Converters Graph

BD9901x Low IQ DC/DC Converters are AEC-Q100 qualified. Ideal for use in Automotive Battery Powered Supplies (Cluster Panel, Car Multimedia).

Part Number VIN VOUT IOUT Circuit Current Package Status
BD99010EFV-M 3.6-35V 3.3V 2A 22µ HTSSOP-B24 MP
BD99011EFV-M 3.6-35V 5.0V 2A 22µ HTSSOP-B24 MP

Download the datasheet here

Tools & Support:
The products have been AEC Q100 qualified and PPAP material is available on request. Samples and demo-boards are available and can be ordered.

For more information about the new BD9901x Family please contact your local ROHM sales organization.

More info about ROHM's DCDC line-up:

ROHM DCDC boards