MAX20082 Datasheet, PDF (1/29 Pages) Maxim Integrated Products – Dual, Redundant, H-Bridge Motor Driver

MAX20082
EVALUATION KIT AVAILABLE
Dual, Redundant, H-Bridge Motor Driver
with ASIL Diagnostics
General Description
The MAX20082 is a dual, full-bridge controller specifically
designed for fault-tolerant automotive applications with
high-power inductive loads such as brushed DC motors.
The device has two fully independent motor-control
channels designed for use with external n-channel power
MOSFETs. Each channel operates from a 4.75V to 5.25V
input supply voltage range, and is capable of working with
motor supply voltages up to 35V.
A charge-pump regulator provides 9.8V gate drive with
a 5V input supply voltage. A bootstrap capacitor is used
to provide the voltage above the input battery voltage
necessary to drive the high-side n-channel MOSFETs in
the H-bridge. An internal top-off charge pump for the high-
side drive allows DC (100% duty cycle) operation.
The device also includes programmable dead time, gate-
drive slew rate, and MOSFET short-circuit threshold.
The H-bridge can be driven in forward mode (clockwise),
reverse mode (counterclockwise), braking mode, and
coast mode. In braking mode, both the low-side MOSFETs
are turned on (synchronous slow decay). In coast mode,
all the MOSFETs in the H-bridge are off (asynchronous
fast decay). The power MOSFETs are protected from
shoot-through by a resistor-adjustable dead-time circuit.
Each channel also integrates a low-side current-sense
amplifier. Used for sensing motor (H-bridge) current, the
current-sense amplifier includes an overcurrent-protec-
tion circuit to limit the current in the event of motor faults.
Integrated diagnostics provide indication of undervolt-
age, overtemperature, H-bridge, and pin faults and can
be configured to protect the power MOSFETs under
most short-circuit conditions. In addition, the device sup-
ports implementation in ASIL systems by having two
completely redundant H-bridge drivers in one package.
The two channels are completely independent and fully
redundant, with no shared pins or functions.
The MAX20082 is specified for operation over the
full -40°C to +125°C ambient temperature range. The
maximum junction temperature is 150°C, with thermal
shutdown at 170°C (typ). The device is available in a
56-pin, 14mm x 6.1mm, TSSOP package.
Ordering Information appears at end of data sheet.
Benefits and Features
●● Comprehensive IC Diagnostics Detect Both IC and
H-Bridge Faults, Enhancing System Safety
●● Both Channels are Fully Independent Without
Any Shared Pins or Circuitry, Providing Complete
Redundancy
●● Resistor-Programmable Functionality Simplifies
Software Development
●● All nFET Operation, Including 100% Duty Cycle,
Saves System Cost
Applications
●● Automotive Motor Drivers
●● Industrial Motor Drivers
Block Diagram
CP1 CN1
IN1
CHARGE-PUMP DOUBLER
DSTH1
UV
SUP1
LXA1
LXB1
V_DSTH1 LS1
VDS
COMPs
MAX20082
SUP1
TOP-OFF
CHARGE
PUMP A
TOP-OFF
CHARGE
PUMP B
CR1
UV
SUP1
UV/OV
BOOTSTRAP MONITOR
BSTA1
DHA1
LXA1
FLT1
IC AND ASIL DIAGNOSTICS
DIAG1
DT1
SLEW1
PA1
PB1
COAST1
EN1
CSO1
CL
3.8V
CONTROL
LOGIC
TEMP
SENSOR
PGND1
DLA1
LS1
BOOTSTRAP MONITOR
BSTB1
DHB1
LXB1
DLB1
PGND1
CSP1
CSN1
AGND1
1 OF 2 CHANNELS
19-7047; Rev 0; 8/14