ROHM BD9850FVM Data Sheet Manual
Summary
These advanced DC/DC switching regulator controllers provide robust and efficient power solutions for demanding applications, including consumer electronics, PCs, routers, and display panels. Featuring high-frequency operation up to 3 MHz, these single- or dual-channel regulators offer FET direct drive and integrated protections like UVLO and TSD, ensuring system reliability. The manual provides comprehensive details on operating limits, electrical characteristics, and performance across various supply voltage ranges, making it essential for engineers designing compact, high-performance digital devices.
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TECHNICAL NOTE
Large Current External FET Controller Type Switching Regulators
High temperature ESD operating Resistance
Single-output High-frequency Step-down
Now available Now available
Switching Regulator(Controller type) BD9850FVM Dual-output Step-up, Negative, Step-down Switching Regulator(Controller type) BD9851EFV Description The BD9850FVM is a 1-channel DC/DC step-down switching regulator controller, while the BD9851EFV is a 2-channel DC/DC step-down switching regulator controller. The BD9850FVM is adaptable for a maximum switching frequency of 2 MHz and the BD9851EFV for that of 3 MHz. Both provide space saving in all applications.
Features 1) Adaptable for 2-MHz switching frequency (externally variable) (BD9850FVM) Adaptable for 3-MHz switching frequency (externally variable) (BD9851EFV) 2) FET direct drive 3) High-accuracy reference voltage (Accuracy: ±1%) 4) Built-in Under Voltage Lock Out circuit (UVLO) 5) Built-in Thermal Shutdown circuit (TSD) 6) The BD9851EFV provides two channels: Channel 1 available for selection of step-down/step-up switching Channel 2 available for selection of step-down/inverting switching. 7) Compact MSOP8 package (BD9850FVM) / HTSSOP-B20 package (BD9851EFV)
Applications TFT panel, TA/Router, digital consumer electronics, PC, and portable CD/DVD/DVC
Product lineup
BD9850FVM BD9851EFV Input range 4V to 9V 4V to 18V Oscillation frequency range 100k Hz to 2MHz 10k Hz to 3MHz External synchronization Not provided Not provided Standby function Not provided Provided Operating temperature –40 C̊ to 85 C̊ –40 C̊ to 85 C̊ Package MSOP8 HTSSOP-B20
Sep. 2008
ROHM CO., LTD
Page Summary Contents For ROHM BD9850FVM Data Sheet Manual
Manual Details
| Brand | ROHM |
|---|---|
| Pages | 17 |
| File Size | 785.99 KB |
| Published | May 31, 2026 |
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Frequently Asked Questions
Which regulator is suitable for single-channel DC/DC step-down conversion?
The BD9850FVM handles 1-channel DC/DC step-down switching regulation.
What are the maximum switching frequencies supported by each controller?
BD9850FVM is adaptable up to 2 MHz, while BD9851EFV supports up to 3 MHz.
Does the BD9851EFV support different power conversion modes?
Yes, it offers two channels: Channel 1 can be step-down or step-up, and Channel 2 can be used for step-down or inverting switching.
What protection features do these regulators include?
They both feature built-in Under Voltage Lock Out (UVLO) circuit and Thermal Shutdown (TSD) circuit.