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DRV3946-Q1-DESIGN — DRV3946-Q1 Datasheet
DRV3946-Q1 Datasheet
DRV3946-Q1
Controlador de contactores con detección de corriente de 40 V de calidad automotriz con regulación d
Hoja de datos
DRV3946-Q1
- AEC-Q100 qualified for automotive applications
- Temperature grade 1: –40°C to +125°C, TA
- Functional Safety-Compliant
- Developed for functional safety applications
- Documentation to aid ISO26262 system design is available
- Systematic integrity up to ASIL D
- Hardware integrity up to ASIL C
- Highly integrated solenoid driver targeted at automotive EV contactor relay and solenoid control applications
- Integration of power supplies, current regulation, 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 RDS(ON): 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 fixed duty cycle
- 4-wire, addressable, 24-bit SPI with CRC
- Allows multiple devices to operate on same SPI
- All devices on shared SPI bus can receive broadcast commands
- 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
The DRV3946-Q1 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 current regulation, configurable peak and hold currents and associated timings, and diagnostics and protection functions. It also incorporates several unique functions that enhance performance compared to traditional discrete solenoid drivers. These functions include integrated redundant clamp circuits to quickly discharge the load current, an addressable SPI, and modified half-bridge driver stage with low on-resistance switches.
The device controls solenoid loads through a single wire low-side connection and can pair with an external high-side switch (that can be shared) for redundant shut-off function. Integrated switches perform charging, recirculation and clamping. The device supports internal and external current control modes. The PWM frequency is configurable, with added low frequency dithering using automatic pseudo random frequencies generation and wave shaping. Internal PWM current control loop leads to reduced software development, since MCU current control loop is not needed. The DRV3946-Q1 supports flexible current control parameters to support wide range of solenoid types. Configurable peak and hold current and corresponding timing parameters allow system level power saving.
The DRV3946-Q1 is targeted to be functional safety-compliant, with ASIL-C rated functional safety goal for relay control and avoiding unintended operation. The device supports comprehensive protection and diagnostic features, such as continuous monitoring of load for open and short detection, on and off-state diagnostics, voltage monitors, short protection and high voltage rated IOs.
An addressable SPI allows multiple devices to be controlled on a shared SPI bus. In addition to reducing required MCU resources, the addressable SPI incorporates a broadcast command structure that can enable all devices on the shared addressed bus to take certain actions simultaneously. The SPI incorporates multiple robustness functions including a CRC, address readback capability, and various bus fault detection mechanisms.
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Documentación técnica
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Ver todo 3 | Documentación principal | Tipo | Título | Opciones de formato | Fecha |
|---|---|---|---|---|
| * | Data sheet | DRV3946-Q1 Dual Channel Automotive Solenoid Driver with Current Regulation, Clamping and Diagnostics datasheet (Rev. A) | PDF | HTML | 12 jun 2024 |
| Technical article | How squib and contactor drivers help improve safety and efficiency in HEV/EV battery disconnect systems (Rev. A) | PDF | HTML | 25 abr 2025 | |
| White paper | Designing Safer, Smarter and More Connected Battery Management Systems (Rev. A) | PDF | HTML | 27 feb 2025 |
Diseño y desarrollo
Para conocer los términos adicionales o los recursos necesarios, haga clic en cualquier título de abajo para ver la página de detalles cuando esté disponible.
Placa de evaluación
DRV3946-Q1EVM — Módulo de evaluación DRV3946-Q1
El DRV3946-Q1EVM permite un fácil control y evaluación del DRV3946-Q1, que es un controlador de contactor y solenoide totalmente integrado y de doble canal. El DRV3946-Q1EVM incluye dos circuitos integrados DRV3946-Q1, cada uno de ellos capaz de controlar dos contactores en una configuración de (...)
Guía del usuario: PDF
Herramienta de diseño
DRV3946-Q1EVM-DESIGN — DRV3946-Q1EVM Design Files
Folder contains datasheet of DRV3946-Q1EVM design files, user guide, firmware source code and GUI installer
Productos y hardware compatibles
| Encapsulado | Pines | Símbolos CAD, huellas y modelos 3D |
|---|---|---|
| HTSSOP (PWP) | 28 | Ultra Librarian |
Pedidos y calidad
Información incluida:
- RoHS
- REACH
- Marcado del dispositivo
- Acabado de plomo/material de la bola
- Clasificación de nivel de sensibilidad a la humedad (MSL)/reflujo máximo
- Estimaciones de tiempo medio entre fallas (MTBF)/fallas en el tiempo (FIT)
- Contenido del material
- Resumen de calificaciones
- Monitoreo continuo de confiabilidad
Información incluida:
- Lugar de fabricación
- Lugar de ensamblaje
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