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STMicroelectronics L99ASC03
- Part No.:
- L99ASC03
- Manufacturer:
- STMicroelectronics
- Category:
- Motor Drivers, Controllers
- Package:
- 48-TQFP Exposed Pad
- Datasheet:
-
L99ASC03.pdf
- Description:
- IC MOTOR DRIVER 6V-28V 48TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,888
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Product details
Overview
L99ASC03 from STMicroelectronics is an automotive-qualified brushless DC (BLDC) sensorless 3-phase motor pre-driver IC designed for engine cooling fans, fuel pumps, and water/oil pumps. It integrates three half-bridge gate drivers, a 5 V/200 mA low-drop voltage regulator, ST SPI interface for diagnostics and configuration, window watchdog, and advanced BEMF detection - enabling full MOSFET drive down to 6 V supply in harsh automotive environments.
For engineers reviewing the L99ASC03 datasheet, L99ASC03 pinout, L99ASC03 application, or L99ASC03 equivalent, this page delivers verified technical context, real-world operating parameters, functional pin roles, automotive-grade safety features, and validated alternative options for motor control system design and sourcing.
Technical Context
The L99ASC03 implements a sensorless commutation architecture using programmable BEMF detection with sampling control via SPI registers, supporting trapezoidal BLDC operation without Hall sensors. Its dual-stage charge pump enables 100% duty-cycle high-side drive and stable gate biasing across wide input voltage ranges (6–27 V).
It features three independent gate driver input pairs (IHx/ILx), each with cross-current protection, plus dedicated drain-source monitoring per phase for open-load and short-circuit detection. The integrated current-sense amplifier (configurable gain and shutdown) feeds analog signals to an internal multiplexer (AOUT) alongside junction temperature and supply rail monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 6 V to 27 V - supports cold-crank and load-dump conditions in 12 V automotive systems. |
| VDD Regulator Output | 5 V ±2%, 200 mA - powers external microcontrollers or logic without external LDO. |
| Standby Current | 15 µA typ. - enables ultra-low-power VBAT standby mode for always-on vehicle subsystems. |
| PWM Frequency Support | Up to 80 kHz - allows high-resolution motor speed control with minimal audible noise. |
| BEMF Detection Accuracy | Programmable threshold and timing - enables robust sensorless commutation across variable motor loads and speeds. |
| Thermal Protection | Two-stage warning (TW1/TW2) and dual thermal shutdown (TSD1/TSD2) - prevents latch-up during overload or cooling failure. |
| SPI Interface Type | ST proprietary SPI (4-wire, CSN/SCK/SDI/SDO) - provides register-level access to all control, status, and diagnostic functions. |
Pinout & Package
TQFP48-EP package: 7 mm × 7 mm × 1 mm body with 4.5 mm × 4.5 mm exposed thermal pad (pin 48 = EP). RoHS-compliant, ECOPACK®2 qualified.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SL3) | Low-side MOSFET source terminal 3 | Direct connection point for external N-channel MOSFET source; referenced to SGND2. |
| 5 (CSO) | Current-sense amplifier output | Analog output of configurable gain CSA; used for closed-loop current regulation or fault detection. |
| 13–16 (SDI, SCK, SDO, CSN) | ST SPI interface signals | Full-duplex serial control bus for configuration, diagnostics, and real-time status readback. |
| 18 (DIS) | Gate driver disable input | Asynchronous active-low signal forcing all six gate outputs to high-impedance state for safe shutdown. |
| 19 (NRES) | Reset output | Open-drain output indicating VDD supervision status; pulled low during regulator undervoltage. |
| 36 (CP) | Charge pump output | Provides boosted gate drive voltage (≥10 V) for high-side N-MOSFETs across full input range. |
| 38–41 (GH1, SH1, GL1, SL1) | Gate and source terminals for Phase 1 | Drive and feedback paths for external half-bridge; SH1/SL1 sense source voltages for DS monitoring. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 Grade 0 (−40 °C to +150 °C ambient), ISO 26262 ASIL-B ready system integration. |
| Three-phase gate driver control | Independent IHx/ILx inputs per phase with programmable dead time and cross-current protection. |
| Integrated diagnostics | Real-time drain-source monitoring, overcurrent detection, thermal warnings, and SPI-accessible status registers. |
| Analog multiplexer (AOUT) | Single-pin output multiplexing VS, VSREG, VSMS, and internal junction temperature for MCU ADC monitoring. |
| Fail-safe operation | Window watchdog with configurable timeout, FS_FLAG output, and automatic transition to safe state on fault. |
Applications
| Engine Cooling Fan Control | Fuel Pump Driver |
|---|---|
|
Use Scenario: Variable-speed radiator fan driven by 12 V battery with start-stop capability and thermal derating. IC Role / Device Role / Timing Role: Pre-driver managing six external MOSFETs; regulates PWM timing and BEMF-based commutation without position sensors. Use Value: Enables >90% efficiency at partial load, reduces EMI via spread-spectrum charge pump, and maintains operation down to 6 V during cranking. |
Use Scenario: High-reliability 12 V fuel delivery system requiring continuous operation under vibration and temperature extremes. IC Role / Device Role / Timing Role: Fault-tolerant motor controller with open-load detection on all phases and thermal shutdown to prevent dry-run damage. Use Value: Eliminates need for external current sensing and discrete watchdog, reducing BOM count while meeting ASIL-B diagnostic coverage targets. |
| Water Pump Actuation | Oil Pump Regulation |
|
Use Scenario: Electric coolant pump in hybrid powertrain with demand-based flow control and thermal management. IC Role / Device Role / Timing Role: Sensorless BLDC driver using AOUT-monitored junction temperature to dynamically adjust speed and torque limits. Use Value: Supports precise thermal throttling via SPI-read temperature data, avoiding mechanical thermostat dependency and improving system response. |
Use Scenario: Variable-displacement oil pump in modern ICE engines requiring pressure modulation via motor speed control. IC Role / Device Role / Timing Role: High-side gate driver with 100% duty cycle support and DS monitoring to detect clogged filter or bearing seizure. Use Value: Enables real-time mechanical fault detection (e.g., open-load on pump rotor) before catastrophic failure, reducing warranty risk. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar BLDC pre-driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DRV3205-Q1 | 5-V regulator not integrated; requires external LDO; higher max supply (40 V); no analog multiplexer. | Targeted at higher-voltage EV traction auxiliary pumps; lacks integrated temp/Vsupply monitoring. | Choose when >27 V operation is required and system already includes 5 V rail; verify external diagnostics coverage. |
| MC33883 | Legacy 3-phase pre-driver; no SPI interface; fixed BEMF thresholds; no charge pump - requires external bootstrap. | Used in cost-sensitive legacy designs; limited configurability and diagnostic depth. | Prefer only for drop-in replacement in existing MC33883-based platforms; lacks L99ASC03's ASIL-B-ready diagnostics. |
Compared with DRV3205-Q1 and MC33883, the L99ASC03 uniquely combines integrated 5 V regulation, SPI-configurable BEMF detection, analog multiplexing, and dual-stage charge pump - delivering higher functional integration, lower system-level component count, and stronger compliance readiness for new automotive BLDC designs.
Availability
L99ASC03 is available at Aetrix Electronics and suitable for engine cooling fans, fuel pumps, and water/oil pumps requiring stable component supply across automotive production lifecycles.
Supply support for L99ASC03 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 broad manufacturing and quality certifications.
The L99ASC03 belongs to ST's Automotive Power Drivers product line, engineered specifically for intelligent, sensorless BLDC motor control in safety-critical vehicle subsystems - emphasizing diagnostic completeness, thermal resilience, and ASIL-B integration readiness.
FAQ
What is the minimum supply voltage required for full gate drive functionality?
The L99ASC03 maintains full gate driver operation-including high-side drive via its two-stage charge pump-down to 6 V input on the VS pin. This ensures reliable motor startup and operation during automotive cold-crank events where battery voltage dips below 8 V, without requiring external boost circuitry or compromising PWM fidelity.
How does the BEMF detection module support sensorless commutation?
The BEMF module uses programmable comparators and sampling windows synchronized to PWM edges to detect zero-crossing points in motor phase voltages. Configuration via SPI registers (e.g., BEMFCNT, BEMFTH) allows tuning for motor inductance, back-EMF constant, and load inertia - enabling robust commutation across speed ranges from stall to 15,000 RPM without Hall or encoder feedback.
Can the L99ASC03 operate in fail-safe mode without microcontroller intervention?
Yes. Upon detecting persistent faults (e.g., 7 consecutive VDD turn-offs or 15 watchdog timeouts), the device autonomously enters VBAT Standby Mode, disabling all gate drivers while maintaining SPI accessibility and diagnostic reporting. The FS_FLAG pin asserts low to signal system-level fail-safe activation, enabling hardware-triggered safety responses independent of host MCU firmware.
What thermal protection mechanisms are implemented beyond junction shutdown?
In addition to TSD1/TSD2 thermal shutdown, the L99ASC03 provides two programmable temperature warning levels (TW1 and TW2) reported via SPI status registers and optionally signaled on NINT. TW1 triggers early derating (e.g., speed reduction); TW2 initiates forced commutation hold or soft shutdown - allowing controlled thermal recovery before reaching critical junction temperature (175 °C).
L99ASC03 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 48-TQFP Exposed Pad
- Packaging:
- Tray
- 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:
- -
- Step Resolution:
- -
- Applications:
- -
- Current - Output:
- -
- Voltage - Supply:
- 6V ~ 28V
- Voltage - Load:
- -
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-TQFP-EP (7x7)
L99ASC03 FAQ
1.How can I place an order for L99ASC03 through Aetrix?
Please submit a Request for Quotation (RFQ) for L99ASC03 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 L99ASC03 reliable?
The price and inventory of L99ASC03 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L99ASC03 is usually 5 days.
3.What payment methods are accepted for L99ASC03?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L99ASC03 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for L99ASC03?
L99ASC03 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your L99ASC03 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 L99ASC03?
For technical support, including L99ASC03 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L99ASC03 requirements.
6.How does Aetrix verify that L99ASC03 is sourced from the original manufacturer or authorized distributors?
All L99ASC03 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 L99ASC03 meets industry standards.
7.What is the process for return or replacement of L99ASC03?
All L99ASC03 units undergo pre-shipment inspection (PSI). If there is an issue with L99ASC03, 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 L99ASC03 part is unused and in its original packaging.
Return procedure for L99ASC03:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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