Summary of STMICROELECTRONICS A6986I AUTOMOTIVE 38 V, 5W ISO-BUCK CONVERTER
The A6986I is an automotive-grade isolated buck converter IC for iso-buck topology, supporting 4–38 V input, 100% duty cycle, and cold-crank/load-dump conditions. It provides adjustable primary output regulation with a secondary derived by transformer ratio (no optocoupler needed). It features up to 1.9 A primary sink for energy transfer and tracked soft-start, peak current-mode forced PWM, 300 ns blanking, low shutdown IQ, and AEC-Q100 qualification across –40 °C to +135 °C.
Parts used in the A6986I Project:
- A6986I iso-buck converter IC <li(Isolated transformer with appropriate turns ratio)
- Input decoupling capacitors
- Output capacitors for primary and secondary
- Gate or drive components as needed for topology
- Resistors for primary output voltage feedback/adjustment
- PCB with automotive-grade layout and grounding
- Optional snubber or EMI suppression components
- Connectors for input, primary output, and isolated secondary
The A6986I is an automotive-grade device specifically designed for the isolated buck topology
The A6986I is an automotive-grade device specifically designed for the isolated buck topology. The 100% duty cycle capability and the wide input voltage range meet the cold crank and load dump specifications for automotive systems.
The primary output voltage can be accurately adjusted, whereas the isolated secondary output is derived by using a given transformer ratio. No optocoupler is required. The primary sink capability typically up to 1.9 A (even during soft-start) allows a proper energy transfer to the secondary side as well as enabling a tracked soft-start of the secondary output.
Key Features
- AEC-Q100 qualified
- 4 V to 38 V operating input voltage
- Operating temperature range: – 40°C to + 135°C for TJ
- 8 µA IQ-SHTDWN
Additional Features
- AEC-Q100 qualified
- Operating temperature range:
- Tj from -40 °C to 135 °C
- Designed for iso-buck topology
- 4 V to 38 V operating input voltage
- Primary output voltage regulation / no optocoupler required
- 1.9 A typical sink peak primary current capability
- Peak current-mode architecture in forced PWM operation
- 300 ns blanking time
Read more: STMICROELECTRONICS A6986I AUTOMOTIVE 38 V, 5W ISO-BUCK CONVERTER
- What input voltage range does the A6986I support?
The A6986I supports a 4 V to 38 V operating input voltage. - Is the A6986I qualified for automotive use?
Yes, the A6986I is AEC-Q100 qualified. - Can the A6986I handle cold crank and load dump conditions?
Yes, the 100% duty cycle capability and wide input range meet cold crank and load dump specifications. - Does the A6986I require an optocoupler for secondary regulation?
No, the isolated secondary output is derived using a transformer ratio and no optocoupler is required. - What is the typical primary sink peak current capability?
The primary sink capability is typically up to 1.9 A. - What temperature range is the A6986I specified for?
The operating junction temperature range is from -40 °C to +135 °C. - What control architecture does the A6986I use?
It uses a peak current-mode architecture in forced PWM operation. - Does the A6986I have a low shutdown current?
Yes, it features 8 µA IQ in shutdown. - What is the blanking time specified for the A6986I?
The device includes a 300 ns blanking time.
