L9973-TR - Automotive Quad Half-Bridge Driver | STMicroelectronics
MPN： L9973-TR ✓ 啟用中L9973-TR 概覽
A half-bridge driver is a power management IC that controls the direction and speed of a DC motor by selectively connecting the motor terminals to the supply voltage or ground. In a quad half-bridge configuration, four such bridges are integrated into a single package, enabling independent control of multiple loads or the implementation of full H-bridge topologies for bidirectional motor control. This architecture is fundamental in automotive body control modules, where multiple actuators such as window lifts, mirror adjusters, and seat motors require precise and efficient switching.
Key features of the L9973-TR include a low quiescent current of 50 uA in standby mode, making it suitable for always-on automotive applications. The device offers overcurrent, overtemperature, and short-circuit protection, ensuring robust operation in harsh environments. It also features a serial peripheral interface (SPI) for advanced diagnostics and control, allowing the microcontroller to read fault status and configure output behavior. The PowerSO-20 package with exposed pad provides excellent thermal performance, with a thermal resistance of 35 C/W, enabling reliable operation at high ambient temperatures up to 125C.
The L9973-TR utilizes a smart power technology that integrates CMOS control logic with high-current DMOS output stages. This monolithic approach reduces external component count and improves reliability compared to discrete solutions. The SPI interface supports daisy-chaining of multiple devices, simplifying wiring in multi-motor systems. The device also includes a dedicated enable pin for fast shutdown in emergency situations.
Typical applications include automotive body control modules, DC motor drivers for window lifts and wiper systems, stepper motor drivers for instrument clusters, and industrial automation actuators. The wide supply voltage range and robust protection features make it ideal for 12V and 24V systems.
When designing with the L9973-TR, ensure adequate PCB copper area for heat dissipation, especially when driving multiple channels at high current. The SPI interface requires proper pull-up resistors on the data lines, and the enable pin should be tied to a controlled logic signal to prevent unintended operation during power-up.
直接替換替代品，適用於 L9973-TR — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： L9973-TR （相同外形與佔位） — 差異在於 Operating Temperature Range, Thermal Resistance (junction-to-ambient), Quiescent Current (Standby).
L9973
✅ 直接替換聯絡詢價
查看資料表 →L9973-TR-Q1
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
BTN8982TA
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
MC33887
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
L9973-TR 最大額定值與電氣特性
| Supply Voltage Range | 5.5 V to 36 V |
| Output Current per Channel | 1.2 A (continuous) |
| Number of Half-Bridges | 4 |
| Quiescent Current (Standby) | 50 uA |
| 工作溫度範圍 | -40C to +125C |
| 封裝 | PowerSO-20 |
| 安裝類型 | Surface Mount |
| 介面 | SPI |
| Protection Features | Overcurrent, Overtemperature, Short-Circuit |
| 熱阻，接面至環境 | 35 C/W |
| Output On-Resistance (typical) | 0.5 ohm |
| Switching Frequency (max) | 20 kHz |
| Logic Input Voltage | 3.3 V / 5 V compatible |
| RoHS 狀態 | Compliant |
| AEC-Q100 Qualified | Yes |
L9973-TR 腳位配置
| 腳位 1 | OUT1 — Half-bridge 1 output |
| 腳位 2 | OUT2 — Half-bridge 2 output |
| 腳位 3 | GND — Ground |
| 腳位 4 | OUT3 — Half-bridge 3 output |
| 腳位 5 | OUT4 — Half-bridge 4 output |
| 腳位 6 | VS — Supply voltage |
| 腳位 7 | EN — Enable input |
| 腳位 8 | SCK — SPI clock |
| 腳位 9 | SDI — SPI data input |
| 腳位 10 | SDO — SPI data output |
| 腳位 11 | CS — SPI chip select |
| 腳位 12 | GND — Ground |
| 腳位 13 | OUT4 — Half-bridge 4 output |
| 腳位 14 | OUT3 — Half-bridge 3 output |
| 腳位 15 | GND — Ground |
| 腳位 16 | OUT2 — Half-bridge 2 output |
| 腳位 17 | OUT1 — Half-bridge 1 output |
| 腳位 18 | VS — Supply voltage |
| 腳位 19 | NC — Not connected |
| 腳位 20 | NC — Not connected |
典型應用
L9973-TR 適用於 6 應用s: Automotive Body Control Module, DC Motor Driver for Window Lifts, Stepper Motor Driver for Instrument Clusters, Industrial Automation Actuator, HVAC Blower Motor Control, Power Seat Adjustment.
Automotive Body Control Module
The L9973-TR is used in automotive body control modules to drive various actuators such as window lifts, mirror adjusters, and seat motors. Its quad half-bridge configuration allows independent control of multiple loads, while the SPI interface enables diagnostics and fault reporting. The wide supply voltage range (5.5V to 36V) accommodates both 12V and 24V vehicle systems, and the AEC-Q100 qualification ensures reliability in harsh automotive environments. The low standby current of 50 uA minimizes battery drain when the vehicle is off, and the built-in overcurrent and overtemperature protection safeguard the module against fault conditions.
推薦
DC Motor Driver for Window Lifts
The L9973-TR drives DC motors in window lift systems, providing bidirectional control via H-bridge configuration. Each half-bridge can source or sink up to 1.2A, sufficient for typical window motors. The PWM capability up to 20 kHz allows smooth speed control and reduces audible noise. The device's protection features, including short-circuit and overtemperature, prevent damage during stall conditions. The SPI interface allows the body controller to monitor motor current and detect obstructions, enhancing safety. The PowerSO-20 package with exposed pad ensures efficient heat dissipation, even during repeated operation.
推薦
Stepper Motor Driver for Instrument Clusters
The L9973-TR can be configured as two H-bridges to drive bipolar stepper motors used in automotive instrument clusters for gauge needles. The SPI interface allows precise control of step sequences, and the 1.2A output current is sufficient for most gauge motors. The device's low quiescent current is beneficial for always-on applications, and the wide temperature range ensures accurate operation in extreme climates. The integrated protection features prevent damage from wiring faults, and the compact PowerSO-20 package saves PCB space in space-constrained clusters.
推薦
Industrial Automation Actuator
In industrial automation, the L9973-TR drives actuators such as solenoid valves, small DC motors, and relays. Its 5.5V to 36V supply range supports various industrial power rails, and the SPI interface enables remote monitoring and control. The device's robust protection features, including overcurrent and overtemperature, ensure reliable operation in factory environments. The low on-resistance (0.5 ohm) minimizes power loss, improving energy efficiency. The PowerSO-20 package is suitable for industrial PCBs with adequate thermal management.
推薦
HVAC Blower Motor Control
The L9973-TR can be used to control HVAC blower motors in automotive or industrial systems. Its quad half-bridge configuration allows for H-bridge control of a single blower motor or independent control of multiple fans. The PWM capability up to 20 kHz enables efficient speed control, and the wide supply voltage range accommodates different system voltages. The device's protection features prevent damage from motor stall or short circuits, and the SPI interface allows for diagnostics and fault reporting. The low standby current is beneficial for systems that remain powered when not in use.
推薦
Power Seat Adjustment
The L9973-TR drives the multiple DC motors used in power seat adjustment systems. Each motor can be controlled independently via the four half-bridges, allowing for precise positioning of the seat. The SPI interface enables the seat control module to monitor motor currents and detect obstructions, enhancing safety. The device's 1.2A output current is sufficient for seat motors, and the wide supply voltage range supports both 12V and 24V systems. The AEC-Q100 qualification ensures reliability in automotive applications, and the low standby current minimizes battery drain when the seat is not in use.
推薦
推薦產品摘要
工程參考資料，適用於 L9973-TR — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | L9973 | L9973-TR-Q1 | BTN8982TA | MC33887 |
|---|---|---|---|---|---|
| Package | PowerSO-20 | PowerSO-20 | PowerSO-20 | PowerSO-20 | PowerSO-20 |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | Infineon | NXP Semiconductors |
| Supply Voltage Range | 5.5V to 36V | 5.5V to 36V | 5.5V to 36V | 6V to 40V | 5V to 28V |
| Output Current per Channel | 1.2A | 1.2A | 1.2A | 1.5A | 5A |
| Number of Half-Bridges | 4 | 4 | 4 | 2 | 1 (H-bridge) |
| Interface | SPI | SPI | SPI | PWM | Parallel |
| Quiescent Current (Standby) | 50 uA | 50 uA | 50 uA | 10 uA | 5 mA |
| AEC-Q100 Qualified | Yes | Yes | Yes | Yes | Yes |
主要差異化特點
- Quad half-bridge configuration in a single package (對比BTN8982TA)
- SPI interface for advanced diagnostics (對比MC33887)
- Low standby current of 50 uA (對比MC33887)
設計說明
The L9973-TR in PowerSO-20 package has a junction-to-ambient thermal resistance of 35 C/W. When driving all four channels at 1.2A with a supply voltage of 13.5V and output on-resistance of 0.5 ohm, each channel dissipates approximately 0.72W, totaling 2.88W. This results in a junction temperature rise of about 100C above ambient. Ensure adequate PCB copper area (at least 2 square inches) and consider forced airflow for high-temperature environments.
Place decoupling capacitors (100 nF ceramic and 10 uF electrolytic) close to the VS pins to suppress voltage transients. The exposed pad should be soldered to a large copper pour connected to ground for optimal heat dissipation. Keep SPI signal traces short and shielded to minimize noise coupling, especially in automotive environments with high electromagnetic interference.
Do not exceed the absolute maximum supply voltage of 40V. Ensure the enable pin is properly controlled during power-up to prevent unintended motor activation. The SPI interface requires pull-up resistors on SDI and SDO lines; use 10k ohm resistors to VCC. When daisy-chaining multiple L9973-TR devices, ensure the chip select lines are correctly routed to avoid data corruption.
合規資訊
RoHS compliant and AEC-Q100 qualified per STMicroelectronics product page. Halogen-free status not specified in available data.