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STMicroelectronics L9788
- Part No.:
- L9788
- Manufacturer:
- STMicroelectronics
- Category:
- Power Management - Specialized
- Package:
- 100-LQFP Exposed Pad
- Datasheet:
-
L9788.pdf
- Description:
- MULTIFUNCTION IC FOR AUTOMOTIVE
- Quantity:
- Payment:
- Shipping:
Inventory:3,418
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Product details
Overview
L9788 from STMicroelectronics is an AEC-Q100 qualified multifunction IC for automotive engine management systems, integrating pre-boost/pre-buck regulators, five 5 V tracking regulators (150 mA each), four LS injector drivers, two O2H load drivers with current sense, CAN-FD with wake-up, LIN 2.1, VRS interface, and watchdog-designed to control 4-cylinder internal combustion engines.
For engineers reviewing the L9788 datasheet, L9788 pinout, L9788 application, or L9788 equivalent, this device serves as a full-power-supply-and-signal-preprocessing SoC for engine ECU designs requiring ISO 26262 compliance, coordinated soft-start, microsecond-channel MSC, and smart-start LS/HS drivers with low-battery function.
Technical Context
The L9788 implements a BCD-based mixed-signal architecture with dual bandgap references, integrated charge-pump for high-side gate drive, and dedicated VRS front-end for crank/cam sensing. Its MSC block supports differential single-ended mode with microsecond timing resolution for precise cylinder identification.
Regulator coordination includes synchronized soft-start across all DC-DC and LDO rails, while safety features include stop-counter with wake-up, temperature monitoring, and independent self-protection on each 5 V tracking regulator. The CAN-FD interface supports selective wake-up via bus activity without CPU intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Input Range | VBAT_Sense: 5.5–28 V - supports cold-crank down to 5.5 V and load-dump up to 40 V (with external protection) |
| 5 V Linear Regulator | VDD5: 5.0 V ±2%, 1 A output - powers core logic and MCU I/O with tight regulation under transient loads |
| Tracking Regulators | 3 × 5 V @ 150 mA each, self-protected - supplies sensors and analog circuitry with independent fault isolation |
| Injector Drivers | 4 × LS, 1.5 A peak, integrated current sense - enables closed-loop fuel injection control without external shunts |
| CAN Interface | CAN-FD compliant, 5 Mbps data rate, integrated wake-up detection - eliminates need for external wake-up comparator |
| MSC Timing Resolution | Microsecond-channel (MSC): 1 µs resolution in differential single-ended mode - enables precise crankshaft position decoding |
| Operating Temperature | −40 °C to +150 °C ambient - qualified per AEC-Q100 Grade 0 for under-hood engine bay placement |
Pinout & Package
L9788 is housed in a thermally enhanced LQFP100 package (14 mm × 14 mm × 1.4 mm) with 7.6 mm × 7.6 mm exposed thermal pad on bottom for PCB heat dissipation and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (FLW_IN_P) | Flying wheel sensor input (+) | Differential VRS interface positive input for crankshaft position sensing |
| Pin 11 (MRD) | Main relay driver output | High-current LS switch (≥10 A) with internal reverse-battery diode for ECU power sequencing |
| Pin 36 & 39 (INJ1, INJ2) | Injector driver outputs | Low-side PWM-controlled outputs with integrated current sense feedback path |
| Pin 94 & 95 (CANH, CANL) | CAN-FD physical layer | Direct connection to CAN bus; supports wake-up via dominant timeout detection |
| Pin 78 (VB_IN) | Main battery supply input | Primary 12 V/24 V rail input for buck regulator and internal power domains |
Key Features
| Feature | Design Value |
|---|---|
| Coordinated soft-start | All regulators ramp synchronously to prevent supply rail collapse during ECU power-on |
| O2H driver current sense | Integrated analog current monitoring on two O2 heater channels - enables open/short diagnostics without external op-amps |
| Smart-start LS/HS drivers | 3 configurable LS/HS outputs with low-battery detection - sustains ignition timing integrity below 7 V battery voltage |
| SEO function | Single-event upset mitigation via hardware-level error detection and automatic recovery reset |
| Stop-counter with wake-up | Counts engine stop duration and triggers wake-up at programmable intervals - supports start-stop system energy optimization |
Applications
| Fuel Injection Control | O2 Sensor Heater Management |
|---|---|
|
Use Scenario: Precise fuel metering in 4-cylinder gasoline engines using sequential multi-point injection. IC Role / Device Role / Timing Role: Provides four synchronized LS injector drivers with real-time current feedback and PWM timing control via MSC channel. Use Value: Enables closed-loop injection timing accuracy within ±1° crank angle and supports diagnostic compliance per ISO 26262 ASIL-B. |
Use Scenario: Dual wideband O2 sensor heating in exhaust manifolds with thermal cycling and condensation exposure. IC Role / Device Role / Timing Role: Delivers two independent O2H drivers (O2H1/O2H2) with integrated current sense and overtemperature shutdown. Use Value: Maintains O2 sensor readiness within 30 s of cold start while detecting open/short faults without external components. |
| Engine Start-Stop Sequencing | Crank/Cam Position Sensing |
|
Use Scenario: Automatic engine shut-down and restart during vehicle idle, requiring reliable low-voltage operation. IC Role / Device Role / Timing Role: Supplies regulated 5 V rails and controls MRD/main relay with reverse-battery protection during restart transients. Use Value: Ensures ECU reboots within 150 ms after restart command even at 6.5 V battery, meeting OEM start-stop latency specs. |
Use Scenario: High-accuracy crankshaft and camshaft position detection under vibration, EMI, and wide temperature range. IC Role / Device Role / Timing Role: Processes differential VRS signals via FLW_IN_P/N pins and decodes position using MSC microsecond-resolution timing. Use Value: Achieves ±0.5° crank angle resolution at 0–10,000 RPM and supports misfire detection via cycle-to-cycle timing variance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multifunction engine management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NXP MC33816 | Single 5 V LDO (500 mA), no integrated CAN-FD; uses external VRS amplifier | Lacks MSC timing engine and SEO function; requires external CAN transceiver | Preferred for cost-sensitive 2-cylinder applications where CAN-FD and microsecond timing are not required |
| Renesas RH850/P1M | MCU-based solution with external power ICs; no integrated pre-regulators or drivers | Requires discrete regulator, driver, and interface ICs - higher BOM count and layout complexity | Suitable when software-defined flexibility and OTA updates outweigh integration benefits |
Compared with MC33816 and RH850/P1M, the L9788 reduces system component count by integrating power regulation, driver stages, and timing peripherals into one AEC-Q100 Grade 0 package-enabling faster time-to-market for 4-cylinder ASIL-B engine ECUs with minimal external support circuitry.
Availability
L9788 is available at Aetrix Electronics and suitable for automotive engine control units, start-stop systems, and OBD-II diagnostic modules requiring stable component supply, long lifecycle support, and AEC-Q100 qualification.
Supply support for L9788 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in automotive, industrial, and power management ICs with vertical manufacturing and functional safety expertise.
The L9788 belongs to ST's Automotive Powertrain IC portfolio, engineered specifically for ISO 26262-compliant engine management systems-delivering integrated power, sensing, actuation, and communication in a single BCD-process die.
FAQ
What is the maximum junction temperature rating for L9788?
The L9788 is rated for operation up to 150 °C junction temperature, validated per AEC-Q100 Grade 0 requirements. Thermal derating begins above 125 °C ambient, and the integrated temperature sensor provides real-time monitoring with programmable interrupt thresholds for thermal shutdown coordination.
Does L9788 support both single-ended and differential VRS signal conditioning?
No-L9788 supports only differential VRS inputs via FLW_IN_P and FLW_IN_N pins. It does not provide internal termination or biasing for single-ended VR sensors; external resistive networks are required if interfacing with legacy single-ended sensors.
Can the MSC block be used for camshaft position decoding independently of crankshaft signals?
Yes-the MSC block operates autonomously with its own clock and can decode camshaft position using dedicated inputs (MSC_DI_P/N). It supports simultaneous crank and cam decoding with independent microsecond timestamping, enabling variable valve timing synchronization.
Is the CAN-FD interface electrically isolated on-chip?
No-the CANH/CANL pins are not galvanically isolated; external isolation (e.g., capacitive or transformer-based) is required for high-voltage domain separation. However, the CAN PHY includes bus-fault protection and wake-up detection without external comparators.
L9788 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 100-LQFP Exposed Pad
- Packaging:
- Tray
- Product Status:
- Active
- Applications:
- -
- Current - Supply:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 100-LQFP-EP (14x14)
L9788 FAQ
1.How can I place an order for L9788 through Aetrix?
Please submit a Request for Quotation (RFQ) for L9788 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for L9788 reliable?
The price and inventory of L9788 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L9788 is usually 5 days.
3.What payment methods are accepted for L9788?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L9788 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for L9788?
L9788 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your L9788 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for L9788?
For technical support, including L9788 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L9788 requirements.
6.How does Aetrix verify that L9788 is sourced from the original manufacturer or authorized distributors?
All L9788 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that L9788 meets industry standards.
7.What is the process for return or replacement of L9788?
All L9788 units undergo pre-shipment inspection (PSI). If there is an issue with L9788, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The L9788 part is unused and in its original packaging.
Return procedure for L9788:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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