L99ASC03TR - 3-Phase BLDC Motor Pre-Driver | STMicroelectronics
MPN: L99ASC03TR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.15 | $3.15 |
| 10 | $2.84 | $28.40 |
| 100 | $2.52 | $252.00 |
| 500 | $2.27 | $1,135.00 |
| 1,000 | $2.02 | $2,020.00 |
L99ASC03TR Overview
A brushless DC (BLDC) motor pre-driver is a specialized motor control IC that sits between a microcontroller (MCU) and the external power stage (MOSFETs or IGBTs). It translates low-voltage logic-level signals from the MCU into high-current gate drive signals that control the commutation and speed of a BLDC motor. In the system hierarchy, a BLDC motor pre-driver is a type of motor driver IC, which falls under power management ICs, ultimately part of the broader semiconductor category. The L99ASC03TR integrates the gate driver, voltage regulation, and protection features, reducing external component count and simplifying PCB design.
Key features include a wide operating voltage range from 5.5V to 28V, a programmable gate drive current for optimized switching performance, and a built-in 5V LDO with 200 mA output capability. The device also provides a 3.3V/5V reference voltage with ±1% accuracy, SPI interface for configuration and diagnostics, and comprehensive protection features such as overcurrent, overvoltage, undervoltage, and thermal shutdown. These features ensure robust operation in harsh automotive environments.
The L99ASC03TR employs a flexible architecture that supports both sensored and sensorless BLDC motor control. The gate driver unit can be configured for different external MOSFET/IGBT combinations, and the SPI interface allows real-time adjustment of gate drive strength and protection thresholds. The integrated LDO and reference voltage eliminate the need for separate power management components, reducing system cost and board space.
Typical applications include automotive engine cooling fans, oil pumps, water pumps, HVAC blowers, and industrial BLDC motor drives. The wide input voltage range and automotive-grade robustness make it suitable for 12V and 24V systems. The device is AEC-Q100 qualified, ensuring reliability for automotive use.
When designing with the L99ASC03TR, ensure proper PCB layout with adequate copper area for thermal dissipation, and place decoupling capacitors close to the VCC and LDO output pins. The SPI interface should be configured correctly to set the desired gate drive current and protection thresholds for the specific motor application.
Drop-in alternatives for L99ASC03TR — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
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L99ASC03
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L99ASC03TR
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$2.02 / Unit
View Datasheet →L99ASC03
✅ Drop-In📋 Reference alternative (not in catalog)
L99ASC03TR Maximum Ratings & Electrical Characteristics
| Motor Type | Brushless DC (BLDC) |
| Number of Phases | 3 |
| Supply Voltage Range | 5.5 V to 28 V |
| Output Current (LDO) | 200 mA |
| Reference Voltage | 3.3 V / 5 V (±1%) |
| Interface | SPI |
| Gate Drive Current | Programmable |
| Package | 48-TQFP-EP (7x7) |
| Mounting Type | Surface Mount |
| Operating Temperature Range | -40°C to +150°C |
| AEC-Q100 Qualified | Yes |
| Protection Features | Overcurrent, Overvoltage, Undervoltage, Thermal Shutdown |
| Sensored/Sensorless | Both |
| RoHS Status | Compliant |
L99ASC03TR Pin Configuration
| Pin 1 | VCC — Power supply input |
| Pin 2 | GND — Ground |
| Pin 3 | VREG — 5V LDO output |
| Pin 4 | VREF — 3.3V/5V reference output |
| Pin 5 | SPI_CS — SPI chip select |
| Pin 6 | SPI_CLK — SPI clock |
| Pin 7 | SPI_MOSI — SPI master out slave in |
| Pin 8 | SPI_MISO — SPI master in slave out |
| Pin 9 | GH1 — Gate drive high side phase 1 |
| Pin 10 | GL1 — Gate drive low side phase 1 |
| Pin 11 | GH2 — Gate drive high side phase 2 |
| Pin 12 | GL2 — Gate drive low side phase 2 |
| Pin 13 | GH3 — Gate drive high side phase 3 |
| Pin 14 | GL3 — Gate drive low side phase 3 |
| Pin 15 | CSA_OUT — Current sense amplifier output |
| Pin 16 | CSA_IN — Current sense amplifier input |
Typical Applications
L99ASC03TR is suitable for 6 applications: Automotive Engine Cooling Fan, Automotive Oil Pump, Automotive Water Pump, Automotive HVAC Blower, Industrial BLDC Motor Drive, Automotive Electric Power Steering (EPS).
Automotive Engine Cooling Fan
The L99ASC03TR is ideal for automotive engine cooling fans, where its wide input voltage range (5.5V to 28V) and AEC-Q100 qualification ensure reliable operation in harsh under-hood environments. The integrated 5V LDO (200mA) powers the external MCU, while the gate driver unit controls the BLDC motor's power stage. The SPI interface allows real-time adjustment of gate drive strength to optimize switching performance and reduce EMI. The device's overcurrent, overvoltage, and thermal shutdown protections safeguard the fan motor and electronics against faults. Compared to discrete solutions, the L99ASC03TR reduces component count and PCB area, simplifying the design and improving overall system reliability.
Recommended
Automotive Oil Pump
The L99ASC03TR is well-suited for automotive oil pumps, providing precise control of the BLDC motor that drives the pump. Its sensorless control capability eliminates the need for Hall sensors, reducing system cost and improving reliability. The integrated 5V LDO (200mA) supplies the MCU, and the 3.3V/5V reference (±1%) ensures accurate analog sensing. The SPI interface enables configuration of gate drive current and protection thresholds, allowing optimization for different oil viscosity and temperature conditions. The device's wide operating temperature range (-40°C to +150°C) and AEC-Q100 qualification make it suitable for engine compartment applications. The compact 48-pin LQFP-EP package fits into space-constrained pump housings.
Recommended
Automotive Water Pump
The L99ASC03TR is an excellent choice for automotive water pumps, where its integrated gate driver and voltage regulator simplify the design. The device supports both sensored and sensorless BLDC control, allowing flexibility in system architecture. The 5V LDO (200mA) powers the MCU, and the SPI interface provides real-time diagnostics, enabling early detection of faults such as overcurrent or overtemperature. The wide input voltage range (5.5V to 28V) accommodates voltage fluctuations during engine start-stop. The AEC-Q100 qualification ensures long-term reliability in the demanding automotive environment. The compact package and integrated features reduce PCB size and BOM cost, making it a cost-effective solution for water pump applications.
Recommended
Automotive HVAC Blower
The L99ASC03TR is designed for automotive HVAC blowers, providing efficient and quiet BLDC motor control. Its programmable gate drive current allows optimization of switching speed to minimize acoustic noise and EMI. The integrated 5V LDO (200mA) powers the MCU, and the 3.3V/5V reference (±1%) ensures accurate speed sensing. The SPI interface enables configuration of protection thresholds, such as overcurrent and overtemperature, to protect the blower motor. The device's wide operating temperature range and AEC-Q100 qualification make it suitable for the passenger compartment and under-dash applications. The compact 48-pin LQFP-EP package fits into the limited space available in HVAC units.
Recommended
Industrial BLDC Motor Drive
The L99ASC03TR is also suitable for industrial BLDC motor drives, offering a wide input voltage range (5.5V to 28V) that accommodates various industrial power supplies. Its sensorless control capability reduces system cost and improves reliability in industrial environments. The integrated 5V LDO (200mA) powers the MCU, and the SPI interface provides real-time diagnostics for predictive maintenance. The device's protection features, including overcurrent, overvoltage, and thermal shutdown, ensure safe operation in demanding industrial settings. The compact package and integrated features simplify PCB design and reduce time-to-market. The AEC-Q100 qualification, while aimed at automotive, also indicates high reliability suitable for industrial applications.
Recommended
Automotive Electric Power Steering (EPS)
The L99ASC03TR can be used in automotive electric power steering (EPS) systems, where precise and reliable BLDC motor control is critical. Its wide input voltage range (5.5V to 28V) and AEC-Q100 qualification ensure reliable operation in the demanding automotive environment. The integrated 5V LDO (200mA) powers the MCU, and the SPI interface enables real-time adjustment of gate drive current for optimal motor control. The device's protection features, including overcurrent and thermal shutdown, safeguard the EPS motor and electronics. The compact 48-pin LQFP-EP package fits into the limited space available in the steering column. The sensorless control capability reduces system cost by eliminating Hall sensors.
Recommended
Recommended Products Summary
Engineering reference data for L99ASC03TR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | L99ASC03 |
|---|---|---|
| Package | 48-TQFP-EP (7x7) | 48-TQFP-EP (7x7) - same |
| Brand | STMicroelectronics | STMicroelectronics |
| Supply Voltage Range | 5.5V to 28V | 5.5V to 28V |
| LDO Output Current | 200mA | 200mA |
| Reference Voltage | 3.3V/5V (±1%) | 3.3V/5V (±1%) |
| Interface | SPI | SPI |
| AEC-Q100 Qualified | Yes | Yes |
| Packaging | Tape & Reel | Tray |
Key Differentiators
- Integrated 5V LDO with 200mA output (vs L99ASC03)
- Wide input voltage range (5.5V to 28V) (vs L99ASC03)
- AEC-Q100 qualified (vs L99ASC03)
Design Notes
Ensure proper PCB layout with adequate copper area for thermal dissipation. Place decoupling capacitors close to the VCC and LDO output pins. Use a 10uF ceramic capacitor on the VCC input and a 10uF ceramic capacitor on the VREG output. Add a 0.1uF ceramic capacitor in parallel for high-frequency noise bypass.
The L99ASC03TR is housed in a 48-pin LQFP-EP package with an exposed pad. For reliable operation, solder the exposed pad to a thermal pad on the PCB with multiple vias to the ground plane. This improves heat dissipation and reduces junction temperature, especially when driving high-current motors.
Do not exceed the maximum input voltage of 28V. Ensure the SPI interface is configured correctly to set the desired gate drive current and protection thresholds. Incorrect SPI settings can lead to inadequate gate drive or false triggering of protection features. Always refer to the datasheet for recommended configuration values.
Compliance Information
RoHS compliant per STMicroelectronics product page. AEC-Q100 qualified for automotive applications.
