Overview
The L9651, produced by STMicroelectronics, is a smart quad switch integrated circuit designed for various power management applications. It consists of four identical low side power switches, each capable of handling up to 2.2 amperes. The device features a serial diagnostic interface that provides detailed failure mode indications, including short circuits to VBAT or ground, open loads, and overtemperature conditions. This makes it particularly suitable for applications requiring robust fault detection and management.
Key Specifications
| Parameter | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|
| Operating Supply Voltage (VBAT) | 4.7 | - | 30 | V |
| Output Current (IOUT) | - | - | 2.2 | A |
| On Resistance (RDSON) at TJ = 25°C | - | 500 | - | mΩ |
| On Resistance (RDSON) at TJ = 150°C | - | 850 | - | mΩ |
| Clamping Voltage (VCL) for Inductive Load | 63 | 70 | 76 | V |
| Operating Temperature (TJ) | -40 | - | 150 | °C |
| Serial Clock Frequency (fCL) | 0 | - | 500 | kHz |
Key Features
- Wide operating supply voltage from 4.7V to 30V
- Outputs internally clamped at 70V for fast inductive load switch off
- Modified VDMOS power stage with UDSBR > 80V
- CMOS compatible inputs
- Enable input (Reset)
- Diagnostic functions including open load detection, short to ground detection, short to battery detection, and overtemperature detection
- Serial diagnostic interface with daisy chain capability
- Fault signal indication at serial data out without need to read out the serial interface
Applications
The L9651 is primarily recommended for automotive applications due to its robust fault detection and management capabilities. It is suitable for use in various power distribution and load driver scenarios within vehicles, ensuring reliable and safe operation under diverse conditions.
Q & A
- What is the L9651?
The L9651 is a smart quad switch integrated circuit produced by STMicroelectronics, featuring four identical low side power switches with a serial diagnostic interface.
- What is the operating supply voltage range of the L9651?
The L9651 operates within a supply voltage range of 4.7V to 30V.
- What is the maximum output current of each switch in the L9651?
Each switch in the L9651 can handle up to 2.2 amperes.
- What type of fault detection does the L9651 support?
The L9651 supports detection of short circuits to VBAT or ground, open loads, and overtemperature conditions.
- How does the L9651 indicate fault signals?
The L9651 indicates fault signals through its serial data out without the need to read out the serial interface.
- What is the typical on resistance (RDSON) of the L9651 at 25°C?
The typical on resistance (RDSON) of the L9651 at 25°C is 500 mΩ.
- What is the clamping voltage for inductive loads in the L9651?
The outputs of the L9651 are internally clamped at 70V for fast inductive load switch off.
- What is the operating temperature range of the L9651?
The L9651 operates within a temperature range of -40°C to 150°C.
- What is the maximum serial clock frequency supported by the L9651?
The L9651 supports a serial clock frequency up to 500 kHz.
- In what package is the L9651 available?
The L9651 is available in a 20-SOIC (PowerSO-20) package with an exposed pad.
