The BD9853AFV is a 2-channel synchronous DC/DC controller that can operate at a maximum switching frequency of 2MHz, enabling the use of a smaller external coil than conventional lower-frequency switching regulators. This makes the BD9853AFV a suitable choice for downsizing applications.
This technical note describes the BD9853AFV, a 2‑channel synchronous DC/DC controller that operates up to 2 MHz switching frequency, allowing the use of a smaller external coil. It outlines key features such as direct‑drive FETs, adjustable oscillator frequency, UVLO, thermal shutdown, and independent channel control.
The document includes absolute maximum ratings, recommended operating conditions, detailed electrical characteristics, pin assignments, block diagrams, timing charts, and ordering information for the SSOP‑B16 package.
| Supply Voltage (VCC‑GND) | 18 V |
|---|---|
| Maximum Oscillator Frequency | 2 MHz |
| Package | SSOP‑B16 |
| Number of Channels | 2 |
| UVLO Threshold Voltage | 4.1 V |
| Thermal Shutdown Threshold | 175 °C |
The controller can operate at a maximum switching frequency of 2 MHz.
It is a dual‑channel (2‑channel) synchronous DC/DC controller.
The device is supplied in an SSOP‑B16 package.
UVLO activates when the supply voltage drops to 4.1 V or lower.