A89503
80 V Automotive Half-Bridge MOSFET Driver
FEATURES AND BENEFITS
DESCRIPTION
TheA89503isanN-channelpowerMOSFETdrivercapableof
controllingMOSFETsconnectedinahalf-bridgearrangement
and is specifically designed for automotive applications with
high-power inductive loads, such as brush DC motors, BLDC
motors, VR/SR motors, solenoids, and actuators.
• Half-bridge MOSFET driver
• Bootstrap gate drive for N-channel MOSFET bridge
• Independent control of high-side and low-side gate drives
with cross-conduction capability
• Charge pump regulator for low supply voltage operation
• 5.5 to 80 V supply voltage operating range
• Integrated logic I/O supply
• SPI-compatible serial interface
• Bridge control by direct logic inputs or serial interface
• Programmable gate drive
Auniquechargepumpregulatorprovidesfullgatedriveoverthe
fullsupplyvoltagerangefrom5.5to80Vformostapplications.
A bootstrap capacitor is used to provide the above-battery
supply voltage required for N-channel MOSFETs.
EachMOSFETcanbe independentlycontrolledbylogic-level
inputs or through the SPI-compatible serial interface. Fully
independent control allows both external FETs to be turned
on at the same time.
• Current sense amplifier
• Programmable diagnostics
• A2SIL™ product—device features for
2
-
safety-critical systems
• AEC-Q100 Grade 0 qualified
Integrated diagnostics provide indication of multiple internal
faults, system faults, and power bridge faults, and can be
configured to protect the power MOSFETs under most short
circuit conditions.
In addition to providing full access to the bridge control, the
serialinterfaceisalsousedtoalterprogrammablesettingssuch
as VDS threshold and fault blank time. Detailed diagnostic
information can be read through the serial interface.
PACKAGE:
24-lead TSSOP with
exposed pad (suffix LP)
TheA89503wasdevelopedinaccordancewithISO26262:2011
asahardwaresafetyelementoutofcontextwithASILBcapability
(pending assessment) for use in automotive safety-related
systems when integrated and used in the manner prescribed in
the applicable safety application note and datasheet.
The A89503 is supplied in a 24-lead eTSSOP (suffix LP).
This package is lead (Pb) free, with 100% matte-tin leadframe
plating (suffix –T).
Not to scale
VBAT
VBAT
Control
Control
Load
Load
A89503
A89503
DSP
or
DSP
or
µC
µC
Diagnostics
Diagnostics
Current Sense
Current Sense
Figure 1: Typical Applications
A89503-DS, Rev. 1
MCO-0000797
June 15, 2020
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