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Dual, Redundant, H-Bridge Motor Driver with ASIL Diagnostics

Designed for Fault-Tolerant Automotive Applications Using Brushed DC Motors

Product Details

Key Features

Simplified Block Diagram

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Key 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/Uses

  • Automotive Motor Drivers
  • Industrial Motor Drivers

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-protection circuit to limit the current in the event of motor faults.

Integrated diagnostics provide indication of undervoltage, overtemperature, H-bridge, and pin faults and can be configured to protect the power MOSFETs under most short-circuit conditions. In addition, the device supports 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 × 6.1mm, TSSOP package.

Simplified Block Diagram

MAX20082: Typical Application Circuit MAX20082: Typical Application Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.