ROHM BD9853AFV datasheet manual
Summary
Rohm BD9853AFV 2-channel synchronous DC/DC step-down controller datasheet. Operates up to 2MHz for compact designs. Features FET direct drive, adjustable frequency, UVLO, TSD, SCP, and independent ON/OFF per channel with soft start. SSOP-B16 package. For power engineers designing regulators for TVs, PCs, and portable devices.
Page 1 Text Content
Large Current External FET Controller Type Switching Regulators
Single/Dual-output High-frequency Step-down Switching Regulator(Controller type)
BD9853AFV No.09028EAT05
●Description The BD9853AFV is a 2-ch 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.
●Features 1) Synchronous Switching Regulator Controller 2channels 2) FET(Pch/Nch) Direct Drive 3) Adjustable Oscillator Frequency with External Resistor (Max. 2MHz) 4) Under Voltage Lockout Function (UVLO) 5) Thermal Shut Down Function (TSD) 6) Short Circuit Protection (SCP) 7) Independent ON/OFF Function in Each Channel with Soft Start Pin 8) SSOP-B16 Package SSOPB16
●Applications TVSTB, PC, Portable CD・DVD,DVC etc.
●Absolute Maximum Ratings (Ta = 25℃)
Parameter Symbol Limits Unit
Supply Voltage (VCC-GND) Vcc 18 V VREGA-GND Voltage VREGA 7 V VCC-VREGB Voltage VREGB 7 V Power Dissipation Pd 562(*1) m W Operating Temperature Range Topr -40 to +85 ℃ Junction Temperature Tjmax +150 ℃ Storage Temperature Range Tstg -55 to +150 ℃ * Reduced by 4.49m W for each increase in Ta of 1℃ over 25℃ (When mounted on a board 70×70×1.6tmm grass-epoxy PCB)
●Recommended Operating Conditions
Limits
Parameter Symbol Unit
Min. Typ. Max.
Supply Voltage Vcc 4.5 12 16 V Oscillator Frequency fosc 100 1000 2000 KHz
www.rohm.com 2009.05 - Rev.A
© 2009 ROHM Co., Ltd. All rights reserved.
Page Summary Contents For ROHM BD9853AFV datasheet manual
Manual Details
| Brand | ROHM |
|---|---|
| Pages | 17 |
| File Size | 466.50 KB |
| Published | June 17, 2026 |
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Frequently Asked Questions
What is the maximum switching frequency of the BD9853AFV?
The maximum switching frequency is 2MHz, adjustable via an external resistor.
What is the recommended supply voltage range for this regulator?
The recommended supply voltage range is 4.5V to 16V, with a typical value of 12V.
What safety protection features does the BD9853AFV include?
It includes Under Voltage Lockout (UVLO), Thermal Shut Down (TSD), and Short Circuit Protection (SCP).
Can each channel of the regulator be turned on or off independently?
Yes, each channel has an independent ON/OFF function via the soft start pin.