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Texas Instruments DRV3901-Q1 Single-Channel Pyro-Fuse Driver

Texas Instruments DRV3901-Q1 Single-Channel Pyro-Fuse Driver is a highly integrated squib driver for automotive EV pyro-fuse applications. It includes the power supplies, current sensing and regulation, and diagnostics and protection functions needed to drive a squib load. It incorporates several vital functions unique to the device and different from traditional squib drivers. These functions include a hardware pin trigger interface, an energy reservoir capacitor diagnostic, an addressable SPI, and an optimized driver stage with an integrated charge pump and additional deployment current options.

The hardware pin trigger (TRGx) interface allows for a deployment command to be issued directly in hardware to the Texas Instruments DRV3901-Q1. This interface enables the flexibility to trigger the deployment with MCU hardware pins, directly with an overcurrent sensor, or through other external hardware circuit monitors. The hardware trigger pins support a 2-pin interface with both threshold or PWM-based options to ensure robustness against miss deployment while still providing flexibility to support a variety of interface options. Additionally, CRC-protected deployment commands can be sent through the SPI bus as a secondary method.

Features

AEC-Q100 qualified for automotive applications
- Temperature grade 1 (–40°C to +125°C, T_A)
Functional Safety-Compliant
- Developed for functional safety applications
- Documentation to aid ISO26262 system design up to ASIL C
Highly integrated squib driver solution targeted at automotive EV pyro-fuse application
- Integration of power supplies, current regulation, diagnostics, and safety functions
- SPI or HW pin-based triggering for flexible interface options and rapid-firing reaction
- Diagnostic functions for system energy reservoir capacitor and squib health monitoring
- 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-driver drivers, and secondary monitoring logic
Up to 28V (40V abs. max) operating voltage

Compact HVSSOP-28 (DGQ) leaded package
Two-wire load interface with protected, current-controlled high-side and protected secondary low-side switches
Integrated charge pump for minimal MOSFET drop-out voltage
4-wire, addressable, 24-bit SPI with CRC protection
- Allows multiple devices to operate on the same SPI
- Allows for broadcast commands to multiple devices
Configurable deployment currents (1.2A/2ms, 1.75A/0.5ms, up to 3.4A/0.5ms)
Configurable deployment interface options
- 2-pin HW trigger with PWM or level signaling
- Protected SPI command with CRC
Comprehensive off-state diagnostics
- Device built-in-self-test
- Driver output and switch test
- Interface test
- Energy reservoir capacitor test
- Squib resistance test
Configurable fault indicator (nFAULT)

Applications

Squib driver
Automotive EV pyro-fuse

Battery disconnect unit
Battery junction box

Texas Instruments DRV3901-Q1 Single-Channel Pyro-Fuse Driver

Features

Applications

Simplified Schematic

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