A4910 Datasheet, PDF (1/36 Pages) Allegro MicroSystems – Automotive 3-Phase MOSFET Driver

A4910
Automotive 3-Phase MOSFET Driver
Features and Benefits
• High current 3-phase gate drive for N-channel MOSFETs
• 3-phase current sense amplifiers
• SPI compatible serial or direct parallel control
• Cross conduction protection
• Programmable dead time
• Top-off charge pump for 100% PWM
• Uncommitted buffer amplifier
• 5.5 to 50 V supply voltage range
• CMOS inputs, 3.3 V to 5 V logic supply
• Extensive diagnostics output
• Low-current sleep mode
Package: 48-pin LQFP with exposed
thermal pad (suffix JP)
Not to scale
Description
The A4910 is a three-phase controller for use with N-channel
external power MOSFETs and is specifically designed for
automotive applications.
A unique charge pump regulator provides full (>10 V) gate
drive for battery voltages down to 7 V, and allows the A4910
to operate with a reduced gate drive down to 5.5 V.
A bootstrap capacitor is used to provide the above battery
supply voltage required for N-channel MOSFETs. An internal
charge pump for the high-side drive allows DC (100% duty
cycle) operation.
Full control over all six power MOSFETs in the 3-phase
bridge is provided, allowing motors to be driven with block
commutation or sinusoidal excitation. The power MOSFETs are
protected from shoot-through by integrated crossover control
and programmable dead time.
Continued on the next page…
Applications
• Electronic power steering (EPS, EHPS, EAS)
• Hydraulic pumps
• Engine cooling fan
• Gearbox actuator
Typical Application Drawing
VBAT
Regulator
VBAT
DSP
or
Micro-
controller
Control
Diagnostics
A4910
Current Sense
3-Phase
BLDC
Motor
A4910-DS