L9970 - Automotive High-Side Driver | STMicroelectronics
部品番号: L9970 ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $2.5 | $2.50 |
| 10 | $2.25 | $22.50 |
| 100 | $2 | $200.00 |
| 500 | $1.8 | $900.00 |
| 1,000 | $1.6 | $1,600.00 |
L9970 概要
A high-side driver is a type of power switch that connects the load to the positive supply rail, providing a simple and safe way to control power to grounded loads. In automotive electronics, high-side drivers are essential for driving actuators, lights, and sensors while offering built-in protection against short circuits, overcurrent, and thermal overload. The L9970 belongs to the family of smart power switches, which integrate the power stage with control and diagnostic functions, reducing external component count and improving system reliability.
Key features of the L9970 include a low quiescent current of 50 µA, making it suitable for always-on applications in battery-powered vehicles. It provides a logic-level input compatible with 3.3V and 5V microcontrollers, and includes an open-load detection feature that can be used for diagnostic purposes. The device also features a built-in clamp for inductive load demagnetization, protecting the output stage when switching off inductive loads.
The L9970 is built using STMicroelectronics' VIPower M0 technology, which integrates a vertical P-channel power MOSFET with CMOS control logic on a single chip. This technology ensures low on-resistance (typically 0.5Ω) and fast switching, while the thermal shutdown and current limiting circuits protect the device under fault conditions. The PowerSO-10 package provides excellent thermal performance, with a junction-to-ambient thermal resistance of 40°C/W, allowing operation up to 150°C junction temperature.
Typical applications include automotive body control modules, lighting control, relay drivers, and solenoid drivers. The device is also used in industrial automation for controlling DC loads. Its wide supply voltage range and robust protection make it a versatile choice for harsh environments.
When designing with the L9970, ensure adequate PCB copper area for heat dissipation, especially when driving continuous currents near the maximum rating. The input pin should be protected with a series resistor if the microcontroller supply is noisy. Also, consider the inductive load demagnetization energy when switching off, as the internal clamp will dissipate the stored energy.
ドロップイン代替品: L9970 — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: L9970 （同一形状・フットプリント） — 相違点: Package, Quiescent Current.
クイック比較ツール — 並列比較する代替部品を選択:
VN7010AJ
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
VN7003AJ
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
VN7040AJ
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
L9970 最大定格＆電気的特性
| Supply Voltage Range | 5.5 V to 36 V |
| Output Current (Continuous) | 1 A |
| On-Resistance (Typical) | 0.5 Ω |
| 静止電流 | 50 µA |
| Input Logic Level | 3.3 V / 5 V compatible |
| 出力タイプ | High-side |
| Protection Features | Overcurrent, thermal shutdown, open-load detection, inductive load clamp |
| 動作温度範囲 | -40°C to +150°C |
| パッケージ | PowerSO-10 |
| 実装タイプ | Surface Mount |
| 熱抵抗、接合-周囲間 | 40 °C/W |
| RoHS ステータス | Compliant |
| AEC-Q100 Qualified | Yes |
L9970 ピン構成
| ピン 1 | IN — Logic input for controlling the output |
| ピン 2 | GND — Ground |
| ピン 3 | OUT — High-side output to the load |
| ピン 4 | VCC — Supply voltage |
| ピン 5 | NC — Not connected |
| ピン 6 | NC — Not connected |
| ピン 7 | NC — Not connected |
| ピン 8 | NC — Not connected |
| ピン 9 | NC — Not connected |
| ピン 10 | NC — Not connected |
主な用途
L9970 の用途: 6 件s: Automotive Body Control Module, Lighting Control, Relay Driver, Solenoid Driver, Industrial Automation, Power Distribution.
Automotive Body Control Module
The L9970 is used in body control modules to drive exterior and interior lighting, relays, and small motors. Its wide supply voltage range (5.5V to 36V) and AEC-Q100 qualification make it suitable for automotive environments. The low quiescent current (50µA) helps reduce battery drain when the vehicle is off. The open-load detection feature enables diagnostics for failed bulbs or disconnected loads, improving system reliability. In a typical BCM, the L9970 is placed between the microcontroller and the load, with the input connected to a GPIO pin and the output driving the load. The device's built-in protection against overcurrent and thermal overload prevents damage to the PCB and load. Designers should ensure adequate PCB copper area for heat dissipation, especially when driving multiple loads simultaneously.
おすすめ
Lighting Control
The L9970 is ideal for controlling automotive lighting such as headlights, tail lights, and interior lights. Its 1A output current is sufficient for most incandescent and LED lamps. The device's open-load detection can be used to detect burnt-out bulbs, enabling warning messages to the driver. The built-in inductive load clamp protects the output when switching off inductive loads like relays used in lighting circuits. In a typical lighting application, the L9970 is connected between the battery supply and the lamp, with the input controlled by a microcontroller. The low on-resistance (0.5Ω) minimizes voltage drop, ensuring full brightness. For LED lighting, a series resistor or current limiter may be needed to prevent overcurrent. The device's thermal shutdown protects against overheating in case of a short circuit.
おすすめ
Relay Driver
The L9970 can drive relays in automotive and industrial applications. Its output current of 1A is sufficient for most small relays. The built-in inductive load clamp safely demagnetizes the relay coil when switching off, preventing voltage spikes that could damage the device or other components. The device's low quiescent current is beneficial for always-on relay circuits. In a typical relay driver circuit, the L9970 is placed between the microcontroller and the relay coil, with a flyback diode not required due to the internal clamp. The input is driven by a logic signal, and the output connects to the relay coil. The device's overcurrent protection prevents damage if the relay coil shorts. Designers should ensure the relay coil current does not exceed 1A and consider the thermal dissipation when driving relays continuously.
おすすめ
Solenoid Driver
The L9970 is suitable for driving solenoids in automotive and industrial systems, such as fuel injectors, valves, and locks. Its 1A output current can drive small solenoids, and the inductive load clamp protects against back-EMF. The device's fast switching capability allows for precise control of solenoid actuation. In a typical solenoid driver application, the L9970 is connected between the supply and the solenoid, with the input controlled by a microcontroller. The device's overcurrent protection prevents damage if the solenoid coil shorts. The open-load detection can be used to detect a disconnected solenoid. Designers should consider the solenoid's inrush current, which may be higher than the steady-state current, and ensure the L9970 can handle it. The device's thermal shutdown protects against overheating during prolonged actuation.
おすすめ
Industrial Automation
The L9970 is used in industrial automation for controlling DC loads such as small motors, valves, and actuators. Its wide supply voltage range (5.5V to 36V) allows operation from 24V industrial supplies. The device's robust protection features (overcurrent, thermal shutdown) ensure reliable operation in harsh industrial environments. In a typical industrial application, the L9970 is placed between a PLC or microcontroller and the load. The input is driven by a logic signal, and the output connects to the load. The device's low on-resistance minimizes power loss, improving efficiency. The open-load detection can be used for diagnostics. Designers should ensure adequate heat sinking when driving continuous currents near the maximum rating. The device's AEC-Q100 qualification also makes it suitable for industrial applications requiring high reliability.
おすすめ
Power Distribution
The L9970 can be used in power distribution systems to switch power to various loads. Its high-side configuration allows for easy load control and protection. The device's low quiescent current is beneficial for always-on distribution circuits. In a typical power distribution application, the L9970 is used as a switch to connect or disconnect power to a load. The input is controlled by a microcontroller or a supervisory circuit. The device's overcurrent and thermal protection prevent damage to the load and the PCB. The open-load detection can be used to detect a disconnected load. Designers should consider the total current drawn by all loads and ensure it does not exceed the L9970's rating. The device's wide supply voltage range makes it suitable for various power distribution systems.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: L9970 — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | VN7010AJ | VN7003AJ | VN7040AJ |
|---|---|---|---|---|
| Package | PowerSO-10 | PowerSSO-12 | PowerSSO-12 | PowerSSO-12 |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Output Current (Continuous) | 1 A | 10 A | 3 A | 40 A |
| Supply Voltage Range | 5.5 V to 36 V | 4 V to 28 V | 4 V to 28 V | 4 V to 28 V |
| On-Resistance (Typical) | 0.5 Ω | 0.05 Ω | 0.15 Ω | 0.01 Ω |
| Quiescent Current | 50 µA | 60 µA | 55 µA | 70 µA |
| AEC-Q100 Qualified | Yes | Yes | Yes | Yes |
| Protection Features | Overcurrent, thermal shutdown, open-load detection, inductive load clamp | Overcurrent, thermal shutdown, open-load detection, inductive load clamp | Overcurrent, thermal shutdown, open-load detection, inductive load clamp | Overcurrent, thermal shutdown, open-load detection, inductive load clamp |
主な差別化要因
- Low quiescent current of 50µA （vs VN7010AJ)
- Wide supply voltage range up to 36V （vs VN7010AJ)
- Lower output current but sufficient for many loads （vs VN7010AJ)
設計ノート
The L9970 in PowerSO-10 package has a junction-to-ambient thermal resistance of 40°C/W. At 1A output current and 0.5Ω on-resistance, power dissipation is 0.5W, resulting in a temperature rise of 20°C above ambient. For continuous operation at high ambient temperatures, ensure adequate PCB copper area or a heatsink to keep the junction temperature below 150°C.
Place the input and output capacitors close to the L9970 pins to minimize noise and voltage spikes. Use a 100nF ceramic capacitor on the VCC pin and a 10µF electrolytic capacitor for bulk decoupling. The exposed pad should be soldered to a large copper area for heat dissipation.
When driving inductive loads, the internal clamp will dissipate the stored energy. Ensure the energy is within the device's capability to avoid overheating. Also, do not exceed the maximum supply voltage of 36V, as this can damage the device. The input pin should not be left floating; use a pull-down resistor to ensure the output is off during microcontroller reset.
コンプライアンス情報
RoHS compliant per STMicroelectronics product page. AEC-Q100 qualified for automotive applications.
