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- **Features**:
- Octal self-configuring low/high-side drivers
- Outputs 1–8 automatically configurable as high-side or low-side drivers without external input
- Outputs 6, 7, and 8 support PWM control via external pins (IN6–8)
- On-resistance: RON(max) = 0.7 Ω @ Tj=25°C; RON(max) = 1.2 Ω @ Tj=125°C
- Minimum current limit of 1 A per output; overcurrent protection threshold of 0.8–2.4 A
- Minimum output voltage clamp of 50 V in low-side configuration
- Maximum output voltage clamp of -14 V in high-side configuration
- SPI interface for output control and diagnostic data communication
- Independent thermal shutdown protection for each channel
- Diagnostics for open-load, short-to-ground, short-to-battery, and overcurrent (selectable latching or non-latching modes)
- Internal charge pump (no external capacitor required)
- Controlled slew rate (SR) for reduced EMC
- Automotive-grade operating temperature range: -40°C to +125°C
Technical Specifications
- **Driver Type**: Octal configurable low/high-side drivers
- **Supply Voltage Range**: 4.5 V to 5.5 V (VDD logic supply)
- **Battery Supply Voltage (Vbat)**: -0.3 V to 40 V
- **On-resistance (RON)**: 0.7 Ω max. @ Tj=25°C; 1.2 Ω max. @ Tj=125°C
- **Output Current Limit**: 1 A min. (per output)
- **Overcurrent Protection Threshold**: 0.8 A to 2.4 A (selectable via SPI: filtered shutdown or linear current limiting)
- **Low-side Output Voltage Clamp**: 50 V min.
- **High-side Output Voltage Clamp**: -14 V max.
- **Output Slew Rate**: Controlled SR for reduced EMC
- **SPI - **Interface**: 16-bit SPI input controlling 8 outputs; supports daisy-chaining
- **PWM Input**: 3 external PWM inputs (IN6, IN7, IN8)
- **Diagnostic Functions**: Open-load detection, short-to-ground, short-to-battery, overcurrent diagnosis (latching/non-latching modes)
- **Thermal Shutdown**: Independent thermal shutdown protection for each output
- **Charge Pump**: Integrated internally; no external capacitors required
- **Operating Temperature Range**: -40°C to +125°C (TA)
- **Package Type**: PowerSSO-28 (with exposed thermal pad)
- **Mounting Type**: Surface Mount (SMD/SMT)
- **Packaging**: Tube / Tape and Reel
- **RoHS Status**: Lead-free / RoHS compliant
- **Product Lifecycle**: Active (Mass Production)
Notes
- **Compatibility**: Please verify compatibility with your application before purchasing. - Package: PowerSSO-28 (28-pin with exposed thermal pad); verify PCB pad design
- Supply Voltage: VDD 4.5V–5.5V; Vbat up to 40V
- Output Configuration: Outputs 1–8 automatically configured as high-side or low-side; no external setting required
- PWM Control: Outputs 6–8 support external PWM input control
- Current Limit: Minimum 1A per output; overcurrent protection threshold 0.8A–2.4A
- Temperature Range: -40°C to +125°C; ensure compatibility with application ambient temperature
- Suffix Distinction: XP = Automotive grade; CN = Industrial grade; TR = Tape and Reel packaging
- **Installation Instructions**:
- ESD Protection: Chip is ESD-sensitive; wear an anti-static wrist strap before handling
- Soldering Temperature: Reflow peak temperature ≤260°C; compliant with lead-free standards
- Thermal Pad: The PowerSSO-28 exposed pad must be connected to a large copper area or thermal vias to ensure effective heat dissipation
- Decoupling Capacitors: Connect appropriate ceramic decoupling capacitors in parallel to ground for VDD and Vbat pins
- Inductive Loads: Internal Zener clamping provides fast turn-off when driving inductive loads in low-side mode; source voltage drops to VGND-15V during high-side turn-off
- Operate the device within the specified temperature range
- **Fault Diagnosis**:
- Output not working: Check corresponding SPI control bits, output configuration, and load connections
- Frequent overcurrent protection triggering: Check if load current exceeds the threshold or if a short circuit exists
- Chip overheating: Check thermal pad connection, load current, and ambient temperature
- SPI communication failure: Check CS, DI, DO, and SCLK connections; verify timing meets datasheet specifications
- High-side/low-side configuration error: Check load wiring; ensure drain/source pins are connected correctly
- **Alternative Part Reference**:
- L9733XP (Automotive grade, PowerSSO-28, tube packaging)
- L9733XPTR (Automotive grade, PowerSSO-28, tape & reel)
- L9733CN (Industrial grade, PowerSSO-28, tube packaging)
- L9733CNTR (Industrial grade, PowerSSO-28, tape & reel)
- L9734 (Same series, different specifications)
- L9737 (Same series, different specifications)
- L9741 (Same series, different specifications)
- Replacement models should be selected based on the specific application grade (automotive/industrial) and packaging requirements.
- **Technical Support**: If further technical support is required, it is recommended to contact STMicroelectronics or a professional automotive electronics repair service.
Summary
The L9733 is a high-performance, 8-channel configurable low-side/high-side driver manufactured by STMicroelectronics, housed in a PowerSSO-28 package. Its eight outputs can be automatically configured for high-side or low-side driving without external settings; outputs 6 through 8 support external PWM control. Features such as low on-resistance (0.7 Ω @ 25°C), a minimum current limit of 1A per channel, 50V low-side clamping, -14V high-side clamping, and comprehensive diagnostic functions (open-load, short-circuit, over-current) make it an ideal choice for driving relays, solenoids, LEDs/bulbs, and motors in automotive electronic systems. The chip supports 16-bit SPI interface control and daisy-chaining; it integrates an internal charge pump (eliminating the need for external capacitors) and utilizes a controlled slew-rate design to effectively reduce EMC emissions. An automotive-grade operating temperature range (-40°C to +125°C) ensures high reliability. During repair or replacement, key factors such as package compatibility (PowerSSO-28), thermal pad design, VDD/Vbat power supply, SPI communication timing, and load configuration methods must be considered to ensure stable system operation.
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