L9980 - Automotive Quad Low-Side Driver | STMicroelectronics
MPN： L9980 ✓ 啟用中L9980 概覽
A low-side driver is a type of power switch that connects the load to ground when activated, with the load connected between the positive supply and the driver output. In automotive systems, low-side drivers are commonly used to control actuators, lamps, and motors, where the load is referenced to the battery positive rail. The L9980 belongs to the family of smart power switches, which integrate protection and diagnostic features to enhance system reliability and reduce external component count.
Key features of the L9980 include four independent output channels, each capable of delivering up to 1.5 A continuous current, with a maximum supply voltage of 40 V. The device features overcurrent protection, thermal shutdown, and undervoltage lockout, ensuring safe operation under fault conditions. Additionally, the L9980 provides a serial peripheral interface (SPI) for advanced diagnostics and control, allowing the microcontroller to monitor output status and detect faults in real time.
From a technical perspective, the L9980 utilizes a smart power technology that integrates CMOS control logic with high-voltage power MOSFETs on a single die. This architecture enables efficient switching with low on-resistance, minimizing power dissipation and heat generation. The SPI interface supports daisy-chaining of multiple devices, simplifying PCB layout in multi-channel systems. The device also features a sleep mode with very low quiescent current, making it suitable for battery-powered applications where power consumption is critical.
Typical applications for the L9980 include automotive body control modules, where it drives exterior and interior lighting, relays for power windows and door locks, and solenoid valves in transmission control units. It is also used in industrial automation for controlling actuators and valves, and in smart home systems for driving LED lighting and motorized blinds. The device's robust protection features and wide operating temperature range (-40°C to +150°C) make it ideal for harsh environments.
When designing with the L9980, it is essential to ensure proper PCB layout with adequate copper area for heat dissipation, especially when driving high currents. The SPI interface should be isolated from high-current traces to minimize noise coupling. Additionally, external flyback diodes are recommended when driving inductive loads to prevent voltage spikes that could damage the device. The L9980's built-in protection features provide a robust solution for demanding applications, but careful attention to thermal management and layout is critical for reliable operation.
直接替換替代品，適用於 L9980 — 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： L9980 （相同外形與佔位） — 差異在於 Protection Features, Supply Voltage Range, Operating Temperature Range, Package, Output Current per Channel.
L9980TR
✅ 直接替換📋 參考替代品（不在目錄中）
VNQ7004
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
TLE6228
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
L9980 最大額定值與電氣特性
| Number of Channels | 4 |
| Output Current per Channel | 1.5 A |
| Supply Voltage Range | 5.5 V to 40 V |
| On-Resistance (per channel) | 0.5 ohm |
| 切換頻率 | 0-100 kHz |
| 介面 | SPI |
| Protection Features | Overcurrent, Thermal Shutdown, Undervoltage Lockout |
| Quiescent Current (Sleep Mode) | 10 uA |
| 工作溫度範圍 | -40C to +150C |
| 封裝 | PowerSO-20 |
| 安裝類型 | Surface Mount |
| MSL 等級 | 3 (168 hours) |
| RoHS 狀態 | Compliant |
| AEC-Q100 Qualified | Yes |
| 輸出類型 | Low-Side |
L9980 腳位配置
| 腳位 1 | OUT1 — Output channel 1 |
| 腳位 2 | OUT2 — Output channel 2 |
| 腳位 3 | OUT3 — Output channel 3 |
| 腳位 4 | OUT4 — Output channel 4 |
| 腳位 5 | GND — Ground |
| 腳位 6 | VCC — Supply voltage |
| 腳位 7 | SCK — SPI clock |
| 腳位 8 | SDI — SPI data input |
| 腳位 9 | SDO — SPI data output |
| 腳位 10 | CS — Chip select |
| 腳位 11 | RST — Reset |
| 腳位 12 | SLEEP — Sleep mode control |
典型應用
L9980 適用於 6 應用s: Automotive Body Control Module, Industrial Automation, Smart Home Lighting, LED Lighting Control, Relay and Solenoid Driver, Power Distribution.
Automotive Body Control Module
The L9980 is used in automotive body control modules to drive exterior and interior lighting, relays for power windows and door locks, and solenoid valves. Its 1.5A per channel output and SPI interface enable efficient control and diagnostics. The device's AEC-Q100 qualification ensures reliability in harsh automotive environments. With a supply voltage range of 5.5V to 40V, it can operate directly from the vehicle battery. The SPI interface allows the microcontroller to monitor output status and detect faults, improving system safety. The low quiescent current in sleep mode helps reduce battery drain when the vehicle is off.
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Industrial Automation
In industrial automation, the L9980 drives actuators, valves, and solenoids in PLCs and control systems. Its robust protection features (overcurrent, thermal shutdown) ensure safe operation in demanding environments. The SPI interface enables remote monitoring and control, reducing wiring complexity. The wide operating temperature range (-40°C to +150°C) makes it suitable for factory floors and outdoor installations. The device's low on-resistance minimizes power loss, improving energy efficiency. With 4 channels, it can control multiple loads, reducing component count and PCB space.
推薦
Smart Home Lighting
The L9980 is used in smart home systems to drive LED lighting and motorized blinds. Its 1.5A per channel output can drive multiple LEDs, and the SPI interface allows dimming control and status feedback. The device's low quiescent current (10 µA) is ideal for always-on smart home devices. The compact PowerSO-20 package fits into small form factors. The protection features prevent damage from short circuits or overcurrent, ensuring long-term reliability. The device can be controlled by a central hub via SPI, enabling automation and energy savings.
推薦
LED Lighting Control
The L9980 is suitable for LED lighting control in automotive and industrial applications. Its 1.5A per channel output can drive high-power LEDs, and the SPI interface enables PWM dimming. The device's thermal shutdown protection prevents overheating, ensuring LED longevity. The wide supply voltage range (5.5V to 40V) accommodates various power rails. The low on-resistance minimizes power dissipation, improving efficiency. The device can be used in headlamps, taillights, and interior lighting, as well as industrial lighting systems.
推薦
Relay and Solenoid Driver
The L9980 is ideal for driving relays and solenoids in automotive and industrial systems. Its 1.5A per channel output can drive standard relays and solenoids directly. The device's built-in flyback diode protection (when external diodes are added) prevents voltage spikes. The SPI interface allows the microcontroller to control and monitor each channel independently. The device's robust protection features (overcurrent, thermal shutdown) ensure reliable operation. The wide operating temperature range makes it suitable for harsh environments.
推薦
Power Distribution
The L9980 can be used in power distribution systems to switch loads on and off. Its 4 channels allow multiple loads to be controlled from a single device. The SPI interface enables centralized control and diagnostics. The device's protection features prevent damage from overcurrent and short circuits. The low quiescent current is beneficial for battery-powered systems. The device's wide supply voltage range (5.5V to 40V) makes it suitable for various power rails. The compact package saves PCB space.
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推薦產品摘要
工程參考資料，適用於 L9980 — 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 | L9980TR | VNQ7004 | TLE6228 |
|---|---|---|---|---|
| Package | PowerSO-20 | PowerSO-20 - same | PowerSO-20 - same | PowerSO-20 - same |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | Infineon |
| Output Current per Channel | 1.5 A | 1.5 A | 2 A | 1.5 A |
| Supply Voltage Range | 5.5V to 40V | 5.5V to 40V | 5.5V to 40V | 5.5V to 40V |
| Interface | SPI | SPI | SPI | SPI |
| On-Resistance | 0.5 ohm | 0.5 ohm | 0.3 ohm | 0.5 ohm |
| AEC-Q100 Qualified | Yes | Yes | Yes | Yes |
| Quiescent Current (Sleep) | 10 uA | 10 uA | 15 uA | 20 uA |
主要差異化特點
- Higher output current than L9980TR (對比L9980TR)
- Lower quiescent current than TLE6228 (對比TLE6228)
- Lower on-resistance than TLE6228 (對比TLE6228)
設計說明
The L9980 in PowerSO-20 package has a thermal resistance of 35°C/W (theta_JA). At 1.5A per channel and 0.5 ohm on-resistance, each channel dissipates 1.125W. With all four channels active, total power dissipation is 4.5W, causing a temperature rise of 157.5°C above ambient. Ensure adequate PCB copper area and airflow to keep junction temperature below 150°C.
Place decoupling capacitors (100nF and 10uF) close to the VCC pin to filter high-frequency noise. For SPI lines, use series resistors (e.g., 33 ohm) to reduce ringing and improve signal integrity. Keep SPI traces short and away from high-current output traces to minimize crosstalk.
When driving inductive loads, always connect a flyback diode across the load to clamp voltage spikes. Without it, the output transistor may be damaged by the back-EMF. Also, ensure the supply voltage does not exceed 40V, as the device may be destroyed. Use a TVS diode on the supply line for transient protection.
合規資訊
RoHS compliant and AEC-Q100 qualified per STMicroelectronics product page.
