Key Features
1．Linear output voltage control ensures high accuracy control of motor rotational
speed
With conventional discrete configurations there is no output voltage linearity with respect to the pulse duty supplied to the PWM terminal, making it difficult to accurately control the motor rotational speed.
In contrast, the BD922F provides linear control of the output voltage based on the PWM duty signal generated by the MCU, enabling high accuracy control of the rotational speed of DC fan motors.
2．Mounting area reduced by 75%
Discrete solutions do not support higher frequency PWM signal input from the MCU. As a
result larger coils and capacitors are required, which can present problems by significantly increasing mounting area.
The BD9227F, on the other hand, features internal frequency control that allows for drive frequencies up to 1MHz, reducing mounting area by approx. 75% over conventional systems by enabling the use of smaller peripheral components, including coils and capacitors.
3．High efficiency across the entire load range
The BD9227F improves efficiency across the entire load range. For example, at a load of
300mA power conversion efficiency is increased by 19%, and the difference becomes even more pronounced at higher loads.
4．Supports 100% duty
Integrating a high-side PMOS makes it possible to generate an output voltage at 100% duty – rare for an IC.
Specifications
| Part No. | Package | Input Voltage Range | Output Voltage Range | Reference Voltage | Switching Frequency | Output Current | Operating Temp. Range |
| BD9227F | SOP8
(5.00mm x 6.20mm x 1.71mm) |
6V to 20V | VCC*0.25V
to VCC |
1.0V±1.0% (25°C)
±2.0% (-40°C to 85°C) |
1.0MHz (typ.) | 1A (max.) | -40°C to 85°C |
Terminology
PWM (Pulse Width Modulation) / Duty
PWM is a method for controlling the output voltage by varying the ON/OFF times in each cycle through repeated switching. Duty refers to the ON-time ratio within each PWM period, with a higher ratio corresponding to higher output voltage.
