Firmware
DRV81X4X-EVM-FIRMWARE — DRV81x4x-EVM FIRMWARE
DRV81x4x-EVM FIRMWARE
DRV81646
65V, 4A 4-channel low-side driver with H/W, SPI and configurable slew rate and cut-off duration
Data sheet
DRV81646
- Four-channel integrated low-side switches
- 140mΩ RDS(ON) at 25°C
- Operating supply voltage range: 4.5V to 65V (70V absolute maximum)
- Selectable current limit from 0.5A up to 4A per channel
- Fast PWM switching up to 500kHz
- Flexible interface options:
- Hardware interface with independent channel PWM input
- SPI enables reduction in GPIO and isolation overhead for high channel count designs
- Integrated catch diodes for flexible decay modes with optional external TVS/Zener diode as alternate current path on switch turnoff
- Slew rate configurable (100ns – 1500ns) enables both slow/fast switching applications
- Diagnostic feedback
- MCU fault interrupt signal (nFAULT)
- Per channel fault report available through SPI
- Protection Features
- User settable current limit
- Independent overtemperature and overcurrent protection for each channel
- Configurable overcurrent cut-off delay (COD) 0.5ms-2ms
The DRV81646 is a four-channel low-side switch driver that operates from 4.5V to 65V and supports a wide range of load currents. The device integrates four low-side switches with a RDS(ON) of 140mΩ, each with a freewheeling diode to the VCLAMP pin. This feature allows the user to either recirculate current or connect an external TVS for inductive load turn-off.
The device can be controlled through a hardware GPIO interface or standard 4-wire SPI. Each channel features individual overtemperature protection, and an analog current limit adjustable with an external resistor on the ILIM pin. There is an optional cut-off delay (COD) configuration which limits the duration of a current-limiting condition on the respective channel, helping to prevent damage to the device or the load. The output slew rates are configurable by setting a resistor on the RSLEW/CNTL pin, providing further flexibility in the control of the output switches. The device has an INRUSH mode boosting the current limit threshold for capacitive loads.
The DRV81646 provides a fault output pin (nFAULT) to indicate fault conditions, and per-channel fault status can be monitored in SPI mode. This feature allows the user to quickly identify and respond to any faults that occur.
Technical documentation
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View all 5 | Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | DRV81646 : 65V Four-Channel Low-side Driver with Hardware, SPI, and Configurable Slew Rate and Cut-off Duration datasheet (Rev. A) | PDF | HTML | 10 Dec 2025 |
| Certificate | DRV81646EVM EU Declaration of Conformity (DoC) | 22 Oct 2025 | ||
| White paper | 軟體定義車輛將汽車電子的未來推入正軌 (Rev. B) | PDF | HTML | 29 Jan 2025 | |
| White paper | 차량용 전자장치의 미래를 바꾸는 소프트웨어 정의 차량 (Rev. B) | PDF | HTML | 29 Jan 2025 | |
| White paper | Software-Defined Vehicles Shift the Future of Automotive Electronics Into Gear (Rev. B) | PDF | HTML | 21 Jan 2025 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.
Evaluation board
DRV81646DGQEVM — DRV81646 evaluation module (DGQ package)
The DRV81x4x evaluation module (EVM) allows for evaluation of the DRV81545, DRV81646, and DRV81646DGQ devices. The EVM has been programmed to work out of the box and begin driving loads right away. To simplify control and configuration, the EVM is accompanied by a graphical user interface (GUI) (...)
Evaluation board
DRV81646EVM — DRV81646 evaluation module
The DRV81x4x evaluation module (EVM) allows for evaluation of the DRV81545, DRV81646, and DRV81646DGQ devices. The EVM has been programmed to work out of the box and begin driving loads right away. To simplify control and configuration, the EVM is accompanied by a graphical user interface (GUI) (...)
GUI for evaluation module (EVM)
DRV81X4X-EVM-GUI — DRV81X4X-GUI
DRV81X4X-GUI
Supported products & hardware
Products
Solenoid drivers
Hardware development
Evaluation board
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| HTSSOP (PWP) | 20 | Ultra Librarian |
| HVSSOP (DGQ) | 24 | Ultra Librarian |
Ordering & quality
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