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STMicroelectronics A6986I

Automotive 38 V, 5W synchronous iso-buck converter

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:
- T_j 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
8 µA IQ-SHTDWN
Adjustable f_SW and synchronization
Embedded primary output voltage supervisor
Adjustable soft-start time
Internal primary current limiting
Overvoltage protection
R_DS(ON) HS = 180 mΩ, R_DS(ON) LS = 150 mΩ
Thermal shutdown

Applications

Automotive isolated IGBT/SiC MOSFET gate drive supply
OBC (On-board charger) for HEV/EV
Electric traction systems

Available tools

STEVAL-A6986IV1:
- 38 V, 5 W synchronous iso-buck converter evaluation board with dual isolated output based on the A6986I
- https://www.st.com/content/st_com/en/products/evaluation-tools/product-evaluation-tools/automotive-ic-eval-boards/steval-a6986iv1.html
STEVAL-A6986IV2:
- 38 V, 5 W synchronous iso-buck converter evaluation board with single isolated output based on the A6986I
- https://www.st.com/content/st_com/en/products/evaluation-tools/product-evaluation-tools/automotive-ic-eval-boards/steval-a6986iv2.html

STEVAL-A6986IV3:

Isobuck-boost converter with four selectable dual voltages

The A6986I is designed for isolated applications and normally implements an iso-buck architecture. The STEVAL-A6986IV3 board adopts an inverting buck-boost topology at the primary side (instead of a standard buck), hence building an isobuck-boost (so called from now on).

Data brief