STMicroelectronics L9026 Multi-Channel Relay Driver

30 March, 2021

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STMicroelectronics L9026 Multi-Channel Relay Driver is optimized for automotive LED and relay applications and is compatible with resistive, inductive and capacitive loads. The L9026 integrates two High-Side drivers and six configurable High-Side/Low-Side drivers and can be driven by SPI or by two dedicated parallel inputs. The device offers advanced diagnostic and protection functionalities such as short to GND, open load, overcurrent, and over-temperature detections. Limp Home functionality is also featured, which allows using two selected drivers in particular faulty conditions, such as SPI fault, micro fault, or supply UV. Daisy chaining is possible even with 8-bit SPI devices.

The L9026 Relay Driver features guaranteed operation undercranking scenarios down to V_BATT = 3 V and provides very low quiescent current under RESET conditions. The SPI interface is used for control and configuration of the loads as well as of the device and status feedback of all diagnostic functions is provided. For direct control and PWM there are two input pins available which are connected to two defined outputs by default. Additional output mapping can be controlled by SPI.

The AEC-Q100 qualified STMicroelectronics L9026 Relay Driver is available in HTSSOP24 and VFQFPN32 package options. On the VFQFPN package 2 additional pins are available for safety reasons. The NRES pin is used to reset internal registers to their default values and the DIS pin is used to disable all channels.

Block Diagram

Features

AEC-Q100 qualified
6x configurable High-Side/Low-Side drivers
2x High-Side drivers
2x parallel input pins with Input Mapping functionality
Cranking capability down to V_BATT = 3.0V
Digital supply voltage compatible with 3.3V and 5.0V microcontrollers
Reverse battery protection on V_BATT and on drain pins without external components
LED mode
Bulb Inrush Mode (BIM) to drive lamps and electronic loads
2x internal PWM generators for microcontroller offload
Very low quiescent current with usage of IDLE pin
Limp Home mode with usage of IDLE and IN pins
Safety features
- Temperature Sensor and Monitoring
- Serial communications using address feedback, 1 parity bit, frame counter, and short frame detection
16-bit Serial Peripheral Interface (SPI) for control and diagnosis
Daisy Chain capable SPI, also compatible with 8-bit SPI devices
HTSSOP24 and VFQFPN32 package options
Fully ISO26262 compliant, ASIL-B systems ready
Green Product (RoHS compliant)