L9951 - Automotive Rear Door Actuator Driver | STMicroelectronics
Teilenummer: L9951 ✓ Aktiv| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $8.75 | $8,75 |
| 10 | $7.92 | $79,20 |
| 100 | $6.98 | $698,00 |
| 500 | $6.24 | $3.120,00 |
| 1.000 | $5.61 | $5.610,00 |
L9951 Übersicht
An automotive door actuator driver is a power management IC that interfaces between a microcontroller and the door lock, mirror, or window motor. It integrates the H-bridge, protection features, and diagnostic feedback, reducing external component count and PCB area. In the system hierarchy, it sits between the body control module (BCM) microcontroller and the actuator motor, translating low-power logic signals into high-current drive signals. This category of components is essential for modern automotive body electronics, where reliability and safety are paramount.
Key features include a half bridge capable of driving 7.4 A loads with an on-resistance of 150 mΩ, two half bridges for 5 A loads with 200 mΩ on-resistance, and two high-side drivers for 1.25 A loads with 800 mΩ on-resistance. The device also includes a programmable soft-start function to handle high inrush currents, such as those exceeding 5 A or 1.25 A. It provides overcurrent, overtemperature, and short-circuit protection, ensuring robust operation in harsh automotive conditions. The L9951 also features a serial peripheral interface (SPI) for advanced diagnostics and control, allowing the microcontroller to read fault status and configure the driver.
The L9951 uses smart power technology that integrates the power stage with control logic and protection circuits on a single die. This architecture enables precise current control and fast fault response, improving system reliability. The SPI interface supports daisy-chaining of multiple drivers, simplifying wiring in multi-motor applications. The device is designed to meet AEC-Q100 automotive qualification standards, ensuring reliability across the -40°C to +150°C operating temperature range.
Typical applications include central locking systems, mirror adjustment, and seat adjustment motors. The device's high current capability and diagnostic features make it ideal for driving DC motors in body control modules, where reliability and safety are paramount. The L9951 is also suitable for rear door actuator systems, where it can drive multiple loads with a single IC, reducing component count and system cost.
When designing with the L9951, ensure adequate PCB copper area for heat dissipation, especially at high output currents. The exposed pad on the PowerSO-36 package should be soldered to a large ground plane to minimize thermal resistance. Proper decoupling capacitors on the supply pins are essential to handle inrush currents during motor start-up. Additionally, the SPI interface should be configured correctly to enable fault monitoring and diagnostic functions.
Drop-in-Alternativen für L9951 – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Varianten dieser Serie
Modelle derselben Serie, die drop-in-kompatibel sind mit L9951 (gleiche Bauform und Footprint) – abweichend in Operating Temperature Range, Package, Protection Features.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
L9951TR
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
L9951XP
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
L9951MTR
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
L9951 Grenzwerte & elektrische Eigenschaften
| Supply Voltage Range | 4.5 V to 28 V |
| Half Bridge 1 Load Current | 7.4 A |
| Half Bridge 1 On-Resistance | 150 mΩ |
| Half Bridge 2 Load Current | 5 A |
| Half Bridge 2 On-Resistance | 200 mΩ |
| High-Side Driver Load Current | 1.25 A |
| High-Side Driver On-Resistance | 800 mΩ |
| Number of Half Bridges | 3 |
| Number of High-Side Drivers | 2 |
| Schnittstelle | SPI |
| Betriebstemperaturbereich | -40°C to +150°C |
| Gehäuse | PowerSO-36 |
| Montageart | Surface Mount |
| Soft-Start Function | Programmable |
| Protection Features | Overcurrent, Overtemperature, Short-Circuit |
| AEC-Q100 Qualified | Yes |
| RoHS Compliant | Yes |
L9951 Pin-Konfiguration
| Pin 1 | VS — Battery supply voltage |
| Pin 2 | GND — Ground |
| Pin 3 | OUT1 — Half bridge 1 output |
| Pin 4 | OUT2 — Half bridge 2 output |
| Pin 5 | OUT3 — Half bridge 3 output |
| Pin 6 | HS1 — High-side driver 1 output |
| Pin 7 | HS2 — High-side driver 2 output |
| Pin 8 | SCLK — SPI clock |
| Pin 9 | SDI — SPI data input |
| Pin 10 | SDO — SPI data output |
| Pin 11 | CSN — SPI chip select (active low) |
| Pin 12 | EN — Enable pin |
Typische Anwendungen
L9951 ist geeignet für 6 Anwendungs: Central Locking Systems, Mirror Adjustment, Seat Adjustment Motors, Rear Door Actuator, Body Control Module (BCM), Power Distribution.
Central Locking Systems
The L9951 is ideal for central locking systems in automotive vehicles. It can drive the DC motors that actuate door locks, providing high current capability (up to 7.4 A) and integrated protection features. The SPI interface allows the body control module to monitor lock status and detect faults, enhancing system reliability. The device's wide supply voltage range (4.5 V to 28 V) ensures operation during battery voltage fluctuations. Its compact PowerSO-36 package and low quiescent current make it suitable for space-constrained door modules. The programmable soft-start function prevents inrush current spikes that could damage the motor or power supply. Overall, the L9951 simplifies the design of central locking systems by integrating multiple drivers and diagnostics into a single IC.
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Mirror Adjustment
The L9951 is well-suited for mirror adjustment systems in vehicles. It can drive the small DC motors that adjust mirror position, with high-side drivers supporting 1.25 A loads. The device's diagnostic features allow the microcontroller to detect mirror stall or fault conditions, improving safety. The SPI interface enables precise control and configuration of the driver. The wide operating temperature range (-40°C to +150°C) ensures reliable operation in extreme climates. The L9951's integrated protection circuits prevent damage from short circuits or overcurrent events. Its low quiescent current in standby mode helps reduce battery drain when the vehicle is off. The PowerSO-36 package provides adequate thermal performance for the moderate power dissipation of mirror motors.
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Seat Adjustment Motors
The L9951 can drive seat adjustment motors in automotive applications. With three half bridges capable of handling up to 7.4 A, it can control multiple motors for seat position, recline, and lumbar support. The device's high current capability and low on-resistance (150 mΩ) minimize power losses. The SPI interface allows the body control module to coordinate motor movements and monitor for faults. The programmable soft-start function reduces mechanical stress on the seat mechanism. The L9951's robust protection features ensure safe operation under stall conditions. Its wide supply voltage range accommodates variations in the vehicle's electrical system. The PowerSO-36 package with exposed pad aids in heat dissipation during prolonged motor operation.
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Rear Door Actuator
The L9951 is specifically designed as a rear door actuator driver. It can control the motors that operate rear door locks, handles, and latches. The device integrates three half bridges and two high-side drivers, allowing it to drive multiple actuators with a single IC. The SPI interface provides diagnostic feedback, enabling the body control module to detect actuator failures. The L9951's high current capability (up to 7.4 A) ensures reliable operation of heavy-duty actuators. The programmable soft-start function prevents inrush current spikes that could damage the actuator or power supply. The device's wide operating temperature range and AEC-Q100 qualification make it suitable for harsh automotive environments. The PowerSO-36 package offers excellent thermal performance for continuous operation.
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Body Control Module (BCM)
The L9951 is a key component in body control modules, which manage various vehicle body functions. It provides the interface between the BCM microcontroller and the actuators for door locks, mirrors, and seats. The device's SPI interface allows the BCM to configure and monitor the driver, enabling advanced diagnostics. The L9951's integrated protection features reduce the need for external components, saving PCB space. Its low quiescent current helps minimize battery drain when the vehicle is idle. The wide supply voltage range ensures operation during battery voltage transients. The PowerSO-36 package is suitable for the thermal demands of driving multiple actuators. The L9951's AEC-Q100 qualification ensures reliability in automotive applications.
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Power Distribution
The L9951 can be used for power distribution in automotive systems, driving resistive loads such as heaters or lamps. Its two high-side drivers support 1.25 A loads, making it suitable for small resistive loads. The device's diagnostic features allow the microcontroller to detect open or short circuits. The SPI interface enables configuration of the drivers for different load types. The L9951's protection features prevent damage from overcurrent or overtemperature conditions. Its wide supply voltage range accommodates various load requirements. The PowerSO-36 package provides adequate thermal performance for continuous operation. The L9951's low quiescent current is beneficial for always-on applications.
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Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für L9951 – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | L9951TR | L9951XP | L9951MTR |
|---|---|---|---|---|
| Package | PowerSO-36 | PowerSO-36 | PowerSO-36 | PowerSO-36 |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Supply Voltage Range | 4.5 V to 28 V | 4.5 V to 28 V | 4.5 V to 28 V | 4.5 V to 28 V |
| Half Bridge 1 Current | 7.4 A | 7.4 A | 7.4 A | 7.4 A |
| Half Bridge 2 Current | 5 A | 5 A | 5 A | 5 A |
| High-Side Driver Current | 1.25 A | 1.25 A | 1.25 A | 1.25 A |
| Interface | SPI | SPI | SPI | SPI |
| Operating Temperature Range | -40°C to +150°C | -40°C to +150°C | -40°C to +150°C | -40°C to +150°C |
Wichtigste Unterscheidungsmerkmale
- High current capability with three half bridges (vs. L9951TR)
- Integrated SPI for diagnostics (vs. L9951XP)
- AEC-Q100 qualified for automotive (vs. L9951MTR)
Designhinweise
The L9951 in PowerSO-36 package can dissipate significant power when driving high-current loads. Ensure the exposed pad is soldered to a large ground plane to minimize thermal resistance. For continuous operation at 7.4 A, calculate power dissipation using P = I^2 * R_DS(on) and verify junction temperature stays within limits. Use thermal vias to enhance heat transfer to other copper layers.
Place decoupling capacitors (e.g., 100 nF and 10 µF) close to the VS pin to handle inrush currents during motor start-up. Use a star-ground topology to avoid ground loops between the power stage and logic. Keep SPI signal traces short and shielded to prevent noise coupling. The exposed pad should be connected to the ground plane with multiple vias.
Do not exceed the absolute maximum supply voltage of 28 V. Ensure the SPI interface is properly configured to avoid unintended driver activation. The soft-start function should be programmed to match the inrush current of the connected load. Always verify the pinout against the datasheet before PCB layout, as the PowerSO-36 package has a specific pin configuration.
Compliance-Informationen
RoHS compliance is indicated in the datasheet. AEC-Q100 qualification is mentioned in the product description. Other compliance details are not specified in the provided data.
