Overview
The L9362, produced by STMicroelectronics, is an integrated quad low-side power switch designed for automotive applications. It features four identical channels, each with its own set of protections and diagnostic capabilities. The device is equipped with power limitation, load interrupt, shorted load detection, thermal shutdown, and error detection via an SPI interface. It also includes integrated Z-diodes for output clamping and free running diodes, making it suitable for managing inductive loads.
Key Specifications
| Parameter | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|
| Supply Voltage (VCC) | 4.5 | 5 | 5.5 | V |
| Operating Temperature (TJ) | -40 | - | 125 | °C |
| Standby Current (ICCRES) | - | 1.3 | - | mA |
| Operating Mode Current (ICCOPM) | - | 11 | 17 | mA |
| Short Circuit Switch Off Threshold (ISCB) | 3.0 | - | 5.0 | A |
| Short Circuit Switch Off Delay Time (t_SCB) | 3 | - | 30 | μs |
| Overtemperature Detection Threshold (TOFF) | 155 | - | 190 | °C |
| Output Clamp Voltage (Vclpa) | 45 | 50 | 60 | V |
| On-Resistance (RDSON) | - | - | - | Ω (dependent on load) |
Key Features
- Parallel Input: Allows multiple inputs to be connected in parallel for increased current capability.
- Internal Zener Clamp: Provides voltage limitation at the power transistors when inductive loads are switched off.
- Reset Input: Features an inverted reset input for system reset functionality.
- SPI for Diagnostic Information Exchange: Enables communication with a microprocessor for failure diagnostics via an SPI interface.
- Typical Internal Oscillator Frequency: Operates at a typical frequency of 325 kHz.
- Current Feedback Output: Each channel has a current feedback output that sinks a current proportional to the load current, useful for servo loop applications.
- Overtemperature and Short Circuit Protection: Includes independent overtemperature detection and shutdown for each output stage, along with short circuit detection and switch-off.
- Load Interrupt and Shorted Load Detection: Detects open-load, short to ground, and short to battery or overtemperature conditions.
- Output Voltage Slope Control: Manages output voltage ramps to reduce electromagnetic emissions.
Applications
The L9362 is primarily designed for automotive applications, where robust and reliable power switching is critical. It is suitable for use in various automotive systems, including but not limited to:
- Power distribution systems
- Load management systems
- Actuator control systems
- Automotive lighting systems
- Other high-reliability power switching applications
Q & A
- What is the primary function of the L9362?
The L9362 is an integrated quad low-side power switch designed for managing power distribution and load control in automotive applications.
- What are the key protection features of the L9362?
The device includes overtemperature protection, short circuit detection, open-load detection, and short to ground detection.
- How does the L9362 handle inductive loads?
The L9362 features internal Zener clamps to limit the output voltage when inductive loads are switched off.
- What is the role of the SPI interface in the L9362?
The SPI interface allows for diagnostic information exchange between the L9362 and a microprocessor, enabling the detection and reporting of failures.
- Can the output stages of the L9362 be connected in parallel?
- What is the typical internal oscillator frequency of the L9362?
The typical internal oscillator frequency is 325 kHz.
- How does the L9362 manage output voltage ramps?
The device controls output voltage ramps to reduce electromagnetic emissions.
- What types of failures can the L9362 detect?
The L9362 can detect short circuit to VBat or overtemperature, short circuit to ground, and open-load conditions.
- How are failures stored and reported in the L9362?
Failures are stored in a failure register and can be read out via the SPI interface.
- What is the purpose of the current feedback output in the L9362?
The current feedback output sinks a current proportional to the load current, which is useful for servo loop applications.
