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STMicroelectronics L99ASC03GTR
- Part No.:
- L99ASC03GTR
- Manufacturer:
- STMicroelectronics
- Category:
- Motor Drivers, Controllers
- Package:
- 48-TQFP Exposed Pad
- Datasheet:
-
L99ASC03GTR.pdf
- Description:
- IC MOTOR DRIVER 6V-28V 48TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,998
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Product details
Overview
L99ASC03GTR from STMicroelectronics is an AEC-Q100 qualified brushless DC motor pre-driver IC for automotive three-phase sensorless motor control. It integrates three half-bridge gate drivers, a 5 V/200 mA voltage regulator, programmable current-sense amplifier, BEMF detection IP, and ST SPI interface - enabling full control of six external N-channel MOSFETs down to 6 V supply in engine cooling fans and fuel pumps.
For engineers reviewing the L99ASC03GTR datasheet, L99ASC03GTR pinout, L99ASC03GTR application, or L99ASC03GTR equivalent, this page delivers verified technical context, validated pin functions, confirmed automotive-grade diagnostics (window watchdog, thermal warning, drain-source monitoring), and real-world motor control use cases - all grounded in ST's production datasheet DocID029080 Rev 2.
Technical Context
The L99ASC03GTR implements a sensorless commutation architecture using advanced BEMF detection with configurable sampling and stepping logic, supporting trapezoidal control without rotor position sensors. Its two-stage charge pump enables 100% duty-cycle high-side drive and stable gate biasing across 6–28 V input range.
Control is executed via ST's proprietary SPI interface (not standard SPI), supporting register-based configuration of operating modes (Active, Flash, VDD/VBAT Standby), overcurrent thresholds, PWM frequency up to 80 kHz, and diagnostic reporting including open-load, short-circuit, and thermal fault states.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| AEC-Q100 Grade | Grade 0 (−40 °C to +150 °C junction temp) - qualified for under-hood automotive applications. |
| VDD Regulator | 5 V ±2%, 200 mA continuous - powers external MCU and internal logic; includes VDD supervision and NRES reset output. |
| Standby Current | 15 µA typical in VBAT Standby Mode - enables ultra-low-power parking mode for fuel/water pumps. |
| PWM Frequency | Up to 80 kHz unrestricted - supports high-efficiency motor operation with minimal acoustic noise. |
| BEMF Detection | Dedicated analog comparator with programmable hysteresis and sampling timing - enables reliable sensorless startup and commutation. |
| Overcurrent Protection | Programmable threshold via SPI; detects both short-circuit (ON-state) and open-load (OFF-state) via drain-source monitoring. |
| Thermal Management | Two-stage thermal response: warning at 150 °C (TW1), shutdown at 175 °C (TSD2); junction temperature monitored via AOUT analog multiplexer. |
Pinout & Package
TQFP48-EP (7 × 7 × 1 mm, 4.5 × 4.5 mm exposed pad) - thermally enhanced package for automotive motor control with 48 pins, including dedicated signal grounds (SGND1/2/3), analog ground (AGND), and isolated power domains (VS, VSREG, VSMS).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IH1–IH3, IL1–IL3 | Gate driver inputs | Direct logic-level inputs controlling high-/low-side external MOSFETs; include cross-current protection timing logic. |
| GH1–GH3, GL1–GL3 | High-/low-side gate outputs | Driving capability up to 1 A peak; support bootstrap or charge-pump high-side biasing with CP1+/CP1−, CP2+/CP2−. |
| VS, VSREG, VSMS | Independent supply inputs | VS powers charge pump and gate drivers; VSREG supplies VDD regulator; VSMS monitors motor supply voltage via AOUT multiplexer. |
| AOUT, DOUT, BEMFOUT | Analog/digital diagnostic outputs | AOUT multiplexes internal temp, VS, VSREG, VSMS; DOUT reports digital status flags; BEMFOUT provides raw back-EMF signal for external analysis. |
| ST SPI (CSN, SCK, SDI, SDO) | Serial control & diagnostics interface | Proprietary ST SPI protocol - enables full read/write access to 32+ registers for configuration, fault logging, and real-time monitoring. |
Key Features
| Feature | Design Value |
|---|---|
| Two-stage charge pump | Enables 100% duty-cycle high-side drive and stable gate voltage ≥10 V even at VS = 6 V - critical for low-battery cold-cranking operation. |
| Drain-source monitoring | Detects open-load and short-circuit faults in both ON and OFF states - eliminates need for external current shunts in basic fault coverage. |
| Configurable current-sense amplifier | Gain and offset programmable via SPI; outputs to CSO pin - supports flexible shunt placement and calibration without hardware change. |
| Window watchdog with fail-safe | Monitors firmware execution timing; triggers NRES reset and disables gate drivers on timeout - meets ASIL-B functional safety requirements. |
| Wake-up via INH pin | Edge-triggered wake-up from VBAT Standby Mode - allows microcontroller-initiated motor restart without full system power-up. |
Applications
| Engine Cooling Fan Control | Fuel Pump Driver |
|---|---|
|
Use Scenario: Variable-speed radiator fan driven by 12 V battery with transient load during engine start-stop cycles. IC Role / Device Role / Timing Role: Pre-driver managing six external MOSFETs in 3-phase bridge; regulates VDD for fan MCU; monitors VS and junction temperature via AOUT. Use Value: Enables smooth ramp-up/ramp-down, overtemperature shutdown at 175 °C, and <15 µA standby draw during vehicle idle - reducing parasitic battery drain. |
Use Scenario: In-tank fuel pump requiring robust operation across −40 °C to +150 °C ambient and 6–16 V supply range. IC Role / Device Role / Timing Role: Sensorless BEMF commutation controller; uses drain-source monitoring to detect clogged filter (open-load) and wiring fault (short-to-ground). Use Value: Eliminates Hall sensors while maintaining reliable startup and stall protection; SPI diagnostics report fault codes to ECU over CAN bus. |
| Water Pump Actuation | Oil Pump Modulation |
|
Use Scenario: Electric coolant pump in hybrid powertrain, synchronized to engine torque demand and coolant temperature. IC Role / Device Role / Timing Role: Gate driver with programmable PWM frequency (up to 80 kHz); interfaces to engine ECU via SPI for speed command and status feedback. Use Value: Reduces acoustic noise vs. 20 kHz switching; thermal warning at 150 °C triggers derating before shutdown - preserving pump longevity. |
Use Scenario: Variable-displacement oil pump in gasoline direct injection engine, modulated based on oil pressure and RPM. IC Role / Device Role / Timing Role: Controls external MOSFETs with cross-current protection; uses current-sense amplifier to monitor phase current for torque estimation. Use Value: Supports precise oil flow control within ±5% accuracy; overcurrent detection prevents MOSFET failure during oil viscosity spikes at cold start. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar three-phase BLDC pre-driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DRV3205-Q1 | Integrated MOSFETs (40 V, 5 A); no external gate driver requirement; lower integration of diagnostics (no BEMF module). | Best for space-constrained 12 V systems where board area > flexibility; lacks sensorless BEMF IP and analog multiplexer. | Select when external MOSFET selection is unnecessary and thermal design favors integrated solution. |
| MC33883 | Legacy 3-phase pre-driver; no embedded voltage regulator; requires external 5 V supply; SPI interface not supported. | Suitable for legacy redesigns with existing 5 V rail and simple fault reporting; no AEC-Q100 Grade 0 qualification. | Choose only for cost-sensitive brownfield designs where BOM reuse outweighs diagnostic and thermal advantages. |
Compared with DRV3205-Q1 and MC33883, the L99ASC03GTR uniquely combines AEC-Q100 Grade 0, integrated 5 V regulator, programmable BEMF detection, and full SPI-accessible diagnostics - making it optimal for new automotive thermal management systems demanding sensorless precision and fail-safe behavior.
Availability
L99ASC03GTR is available at Aetrix Electronics and suitable for engine cooling fans, fuel pumps, water pumps, and oil pumps requiring stable component supply, long-term automotive lifecycle support, and traceable AEC-Q100 compliance documentation.
Supply support for L99ASC03GTR 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, specializing in automotive, power, and microcontroller solutions with ISO/TS 16949-certified manufacturing.
The L99ASC03GTR belongs to ST's ASC (Automotive Smart Control) product line - engineered specifically for intelligent, sensorless three-phase motor actuation in harsh automotive environments with emphasis on functional safety and thermal resilience.
FAQ
What is the minimum operating supply voltage for gate driver functionality?
The L99ASC03GTR maintains full gate driver operation down to 6 V on the VS pin, enabled by its two-stage charge pump that sustains ≥10 V gate bias for external N-channel MOSFETs. This ensures reliable motor startup during cold-cranking events in 12 V automotive systems, as confirmed in Section 2.10 and Table 17 of DocID029080 Rev 2.
Does the L99ASC03GTR support true sensorless startup from zero speed?
No - the L99ASC03GTR's BEMF detection IP requires initial rotor movement to generate back-EMF; it does not implement forced-commutation or align-and-kick startup. Reliable startup from standstill requires auxiliary methods (e.g., external position sensor or controlled open-loop acceleration), as stated in Section 2.15.3 and Figure 25 of the datasheet.
How is thermal shutdown behavior configured?
Thermal shutdown (TSD2 at 175 °C) and warning (TW1 at 150 °C) thresholds are fixed and non-programmable. The device automatically enters VBAT Standby Mode after seven consecutive VDD turn-offs due to TSD2 faults, per Figure 14 and Section 2.8.2 - no SPI register controls these trip points.
Can the current-sense amplifier be used for closed-loop torque control?
Yes - the programmable gain and offset current-sense amplifier (CSA) feeds phase current data to the CSO pin with 10-bit effective resolution (per Table 21), enabling real-time torque estimation. However, closed-loop torque control requires external MCU processing; the L99ASC03GTR provides only analog sensing and fault detection, not PID execution.
L99ASC03GTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 48-TQFP Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Motor Type - Stepper:
- -
- Motor Type - AC, DC:
- Brushless DC (BLDC)
- Function:
- Controller - Commutation, Direction Management
- Output Configuration:
- Pre-Driver - Half Bridge (3)
- Interface:
- SPI
- Technology:
- Power MOSFET
- Step Resolution:
- -
- Applications:
- -
- Current - Output:
- -
- Voltage - Supply:
- 6V ~ 28V
- Voltage - Load:
- -
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-TQFP-EP (7x7)
L99ASC03GTR FAQ
1.How can I place an order for L99ASC03GTR through Aetrix?
Please submit a Request for Quotation (RFQ) for L99ASC03GTR 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 L99ASC03GTR reliable?
The price and inventory of L99ASC03GTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L99ASC03GTR is usually 5 days.
3.What payment methods are accepted for L99ASC03GTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L99ASC03GTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for L99ASC03GTR?
L99ASC03GTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your L99ASC03GTR 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 L99ASC03GTR?
For technical support, including L99ASC03GTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L99ASC03GTR requirements.
6.How does Aetrix verify that L99ASC03GTR is sourced from the original manufacturer or authorized distributors?
All L99ASC03GTR 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 L99ASC03GTR meets industry standards.
7.What is the process for return or replacement of L99ASC03GTR?
All L99ASC03GTR units undergo pre-shipment inspection (PSI). If there is an issue with L99ASC03GTR, 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 L99ASC03GTR part is unused and in its original packaging.
Return procedure for L99ASC03GTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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