A6862 Datasheet, PDF (1/14 Pages) Allegro MicroSystems – Automotive 3-Phase Isolator MOSFET Driver

A6862
Automotive 3-Phase Isolator MOSFET Driver
FEATURES AND BENEFITS
• Three floating n-channel MOSFET drives
• Maintains V_GS with 100 kΩ gate-source resistors
• Integrated charge pump controller
• 4.5 to 50 V supply voltage operating range
• Two independent activation inputs
• Single phase-enable input
• VCP and VGS undervoltage protection
• 150°C ambient (165°C junction) continuous
APPLICATIONS
• 3-phase disconnect for ASIL systems up to level D
• Electric power steering (EPS)
• Electric braking
• 3-phase solid-state relay driver
PACKAGE:
16-lead TSSOP with exposed thermal pad (suffix LP)
Not to scale
DESCRIPTION
The A6862 is an n-channel power MOSFET driver capable
of controlling MOSFETs connected as a 3-phase solid-state
relay in phase-isolation applications. It has three independent
floating gate drive outputs to maintain the power MOSFETs in
the on-state over the full supply range with high phase-voltage
slew rates. An integrated charge pump regulator provides the
above battery supply voltage necessary to maintain the power
MOSFETs in the on-state continuously when the phase voltage
is equal to the battery voltage. The charge pump will maintain
sufficient gate drive (>7.5 V) for battery voltages down to 4.5 V
with 100 kΩ gate source resistors.
The three gate drives can be controlled by a single logic-level
input. In typical applications, the MOSFETs will be switched
on within 8 µs and will switch off within 1 µs.
Two independent activation inputs can be used to put theA6862
into a low-power sleep mode with the charge pump disabled.
Undervoltage monitors check that the pumped supply voltage
and the gate drive outputs are high enough to ensure that the
MOSFETs are maintained in a safe conducting state.
The A6862 is supplied in a 16-lead TSSOP (LP) with exposed
pad for enhanced thermal dissipation. They are lead (Pb) free,
with 100% matte-tin leadframe plating.
A4405
Regulator
Micro-
Controller
A4910
A4935
A4937
A4939
VBAT
A6862
3-Phase
BLDC
Motor
A6862-DS
Figure 1: Typical Application Diagram