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Texas Instruments DRV3946-Q1 Dual-Channel Solenoid Driver

Texas Instruments DRV3946-Q1 Dual-Channel Solenoid Driver is a highly integrated solution to drive two solenoids for automotive applications, such as contactor relays in EV battery management systems. It includes power supplies, current sensing and regulation, configurable peak and hold currents and associated timings, and diagnostics and protection functions. The Texas Instruments DRV3946-Q1 also incorporates several unique functions that enhance performance compared to traditional discrete solenoid drivers. These functions include integrated redundant clamp circuits to discharge the load current quickly, an addressable SPI, and a modified half-bridge driver stage with low on-resistance switches.

Features

AEC-Q100 qualified for automotive applications
- Temperature grade 1 (-40°C to +125°C, T_A)
Functional Safety-Compliant targeted
- Developed for functional safety applications
- Documentation to aid ISO26262 system design up to ASIL C will be available
Highly integrated solenoid driver targeted at automotive EV contactor relay and solenoid control applications
- Integration of power supplies, current regulations, diagnostics, and safety functions
- High-efficiency solenoid driving with configurable peak and hold current settings
- Built-in-self-test and diagnostic functions for power supplies, interfaces, drivers, and monitors
- Architecture for reliable operation with redundant power supplies, low-side and high-side drivers, and secondary monitoring logic
Up to 28V (40V abs. max) operating voltage
Integrated modified half-bridge
- For charging, recirculation, and clamping
- Typical R_DS(ON) of 37mΩ (low-side), 57mΩ (high-side)
- Quick Turn Off with integrated clamp circuits
- High-side clamp with redundant low-side clamp

Low-side load control by single wire connection
- Allows external high-side switch for redundant shut-off
±5% accurate Low and High-side current sense
- Analog load current feedback pin (IPROPI)
Internal control mode
- Closed loop PWM current regulation
- Configurable peak time, peak, and hold currents
External control mode
- Vary duty cycle at fixed PWM frequency
- Vary PWM frequency at a fixed duty cycle
4-wire, addressable, 24-bit SPI with CRC
- Allows multiple devices to operate on the same SPI
- Can broadcast commands to multiple devices
Comprehensive protection and diagnostics
- Device built-in-self-test
- Load monitoring for open/short detection
- Sensing loss of control during driver ON and OFF–Forced relay open for undercurrent or undervoltage
- Redundant pin shut-off
- Fault notification on nFAULT pin

Applications

EV Contactor relays
Peak and hold solenoids
On and off relays
Proportional solenoids
Battery Disconnect Units (BDUs)

Battery Junction Boxes (BJBs)
Power Distribution Boxes (PDBs)
Active Suspension Systems
Vehicle Control Units (VCUs)

Texas Instruments DRV3946-Q1 Dual-Channel Solenoid Driver

Features

Applications

Simplified Schematic

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