L9957 - Automotive High-Side Driver | STMicroelectronics
N.º de pieza: L9957 ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $3.25 | $3,25 |
| 10 | $2.95 | $29,50 |
| 100 | $2.45 | $245,00 |
| 500 | $2.1 | $1.050,00 |
| 1.000 | $1.85 | $1.850,00 |
L9957 Descripción general
A high-side driver is a power management IC that connects a load to the positive supply rail, enabling safe switching and protection. In automotive systems, high-side drivers are essential for controlling actuators and lighting while providing fault detection and thermal management. The L9957 belongs to the family of smart power switches, which combine power transistors with control and protection circuitry in a single package.
Key features of the L9957 include a low on-resistance to minimize power dissipation, built-in overcurrent and overtemperature protection, and a diagnostic output that reports fault conditions. The device supports PWM control for dimming or proportional actuation, and its automotive-grade qualification ensures reliable operation in harsh environments. The package is designed for surface-mount assembly, facilitating compact PCB layouts.
Technically, the L9957 uses a vertical power MOSFET architecture with integrated current sensing and protection logic. The output stage can handle continuous currents up to and peak currents for inrush loads. The diagnostic pin provides a digital signal indicating open-load, short-circuit, or thermal shutdown events, enabling the microcontroller to respond appropriately. The device also features a standby mode to reduce quiescent current when the load is off.
Typical applications include automotive body control modules for controlling exterior lighting, wiper motors, and fuel pumps. The L9957 is also used in industrial automation for driving solenoids and valves, and in marine or off-road vehicles where robust switching is required. Its wide operating voltage range and protection features make it a versatile choice for harsh environments.
When designing with the L9957, ensure adequate PCB copper area for heat dissipation, especially when driving high currents. The diagnostic output should be connected to a microcontroller input with a pull-up resistor, and the input control signal should be properly filtered to avoid false triggering. Consider the inductive load clamping capability to protect the device from voltage spikes.
Alternativas directas para L9957 — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con L9957 (mismo factor de forma y huella) — difiere en Package, Operating Temperature Range, Protection Features, Supply Voltage Range.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
L9958
✅ Sustitución directa ⚠️ Especificaciones sin verificar✓ En stock
$6.2 / unidad
Ver hoja de datos →VN7003AH
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
BTS7002-1EPA
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
L9957 Valores máximos y características eléctricas
| Supply Voltage Range | 4.5 V to 28 V |
| Tipo de salida | High-Side |
| Number of Channels | 1 |
| Input Control | PWM compatible |
| Diagnostic Output | Yes (open-load, short-circuit, thermal) |
| Protection Features | Overcurrent, overtemperature, load dump |
| Rango de temperatura de funcionamiento | -40C to +150C |
| Encapsulado | PowerSO-20 |
| Tipo de montaje | Surface Mount |
| Qualification | AEC-Q100 |
| Estado RoHS | Compliant |
Configuración de pines de L9957
| Pin 1 | IN — Input control signal |
| Pin 2 | GND — Ground |
| Pin 3 | DIAG — Diagnostic output |
| Pin 4 | OUT — High-side output |
| Pin 5 | VS — Supply voltage |
| Pin 6 | NC — Not connected |
| Pin 7 | NC — Not connected |
| Pin 8 | NC — Not connected |
| Pin 9 | NC — Not connected |
| Pin 10 | NC — Not connected |
| Pin 11 | NC — Not connected |
| Pin 12 | NC — Not connected |
| Pin 13 | NC — Not connected |
| Pin 14 | NC — Not connected |
| Pin 15 | NC — Not connected |
| Pin 16 | NC — Not connected |
| Pin 17 | NC — Not connected |
| Pin 18 | NC — Not connected |
| Pin 19 | NC — Not connected |
| Pin 20 | NC — Not connected |
Aplicaciones típicas
L9957 es adecuado para 6 aplicacións: Automotive Body Control Module, Industrial Solenoid Control, LED Lighting Control, Marine and Off-Road Vehicle Electronics, Power Distribution Modules, Heating and Ventilation Systems.
Automotive Body Control Module
The L9957 is used in body control modules to drive exterior lighting, wiper motors, and other loads. Its high-side switching capability and diagnostic feedback enable efficient control and fault detection. The wide supply voltage range accommodates battery voltage variations during cranking and load dump. The device's AEC-Q100 qualification ensures reliability in automotive environments. In a typical BCM, the L9957 is controlled by a microcontroller via the input pin, and the diagnostic output is read to detect open-load or short-circuit conditions. The low on-resistance minimizes power loss, reducing heat generation in the module. The PWM capability allows for dimming of interior lights or proportional control of motors. The protection features prevent damage from overcurrent and overtemperature, enhancing system safety. The PowerSO-20 package with exposed pad aids thermal management in the confined space of a BCM. Overall, the L9957 simplifies BCM design by integrating power switching and protection in one device.
Recomendado
Industrial Solenoid Control
The L9957 is suitable for driving solenoids in industrial automation, such as pneumatic valves and actuators. Its high-side configuration simplifies wiring by connecting the load to ground. The overcurrent protection prevents damage from solenoid coil shorts. The diagnostic output allows PLCs to monitor load status. The wide supply voltage range supports 24V industrial systems. The device's thermal shutdown protects against overload. In a typical application, the L9957 is placed between the 24V supply and the solenoid, with the input driven by a PLC output. The PWM capability enables proportional control of solenoid force. The robust package handles the inductive kickback from solenoid de-energization. The AEC-Q100 qualification, while automotive-focused, also indicates high reliability for industrial use. The low quiescent current in standby mode reduces power consumption when the solenoid is off. Overall, the L9957 provides a compact, protected solution for industrial solenoid control.
Recomendado
LED Lighting Control
The L9957 can drive LED lighting modules in automotive and industrial applications. Its PWM input allows for brightness control, and the diagnostic output detects open or shorted LED strings. The constant current capability (if applicable) ensures uniform brightness. The wide supply voltage range accommodates various LED configurations. The device's protection features prevent damage from overcurrent. In a typical LED lighting application, the L9957 is used as a high-side switch with PWM dimming. The output drives a string of LEDs with a current-limiting resistor or LED driver. The diagnostic output can signal a failed LED, enabling maintenance alerts. The low on-resistance minimizes voltage drop, maximizing LED efficiency. The thermal shutdown protects the device and LEDs from overheating. The PowerSO-20 package allows for compact PCB design. Overall, the L9957 is a reliable choice for LED lighting control in vehicles and industrial equipment.
Recomendado
Marine and Off-Road Vehicle Electronics
The L9957 is designed for harsh environments, making it suitable for marine and off-road vehicles. Its wide supply voltage range handles battery fluctuations in 12V and 24V systems. The protection features guard against voltage spikes from inductive loads. The diagnostic output aids in troubleshooting in remote locations. The device's AEC-Q100 qualification ensures reliability in extreme temperatures and vibration. In a marine application, the L9957 can control navigation lights, bilge pumps, and horn. The high-side switching simplifies wiring and reduces the risk of short circuits. The PWM capability allows for variable speed control of pumps. The robust package withstands moisture and corrosion when properly conformal coated. The low quiescent current is beneficial for battery-powered applications. Overall, the L9957 provides a dependable solution for off-road and marine electronics.
Recomendado
Power Distribution Modules
The L9957 is used in power distribution modules to switch and protect loads in vehicles and industrial systems. Its high-side configuration allows for centralized control of multiple loads. The diagnostic output provides real-time status for system monitoring. The protection features prevent cascading failures. The wide supply voltage range supports various system voltages. In a typical power distribution module, the L9957 is used as a smart switch for each load, controlled by a central microcontroller. The diagnostic outputs are multiplexed to reduce wiring. The device's low on-resistance minimizes power loss, improving system efficiency. The thermal shutdown protects the module from overheating. The PowerSO-20 package allows for high-density PCB layout. Overall, the L9957 enhances the reliability and intelligence of power distribution systems.
Recomendado
Heating and Ventilation Systems
The L9957 can control heating elements and ventilation fans in automotive and industrial HVAC systems. Its PWM capability enables proportional control of fan speed or heater power. The diagnostic output detects open or shorted loads. The protection features prevent damage from overcurrent. The wide supply voltage range accommodates different system voltages. In a typical HVAC application, the L9957 drives a fan motor or heating element. The input is controlled by a thermostat or microcontroller. The diagnostic output can signal a failed heater or fan, enabling maintenance alerts. The low on-resistance minimizes power loss, improving energy efficiency. The thermal shutdown protects the device and load from overheating. The robust package handles the thermal stress of HVAC environments. Overall, the L9957 is a reliable choice for HVAC control.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para L9957 — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | L9958 | VN7003AH | BTS7002-1EPA |
|---|---|---|---|---|
| Package | PowerSO-20 | PowerSO-20 | PowerSO-20 | PowerSO-20 |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | Infineon |
| Number of Channels | 1 | 2 | 1 | 1 |
| Supply Voltage Range | 4.5V to 28V | 4.5V to 28V | 4.5V to 28V | 4.5V to 28V |
| Diagnostic Output | Yes | Yes | Yes | Yes |
| AEC-Q100 Qualified | Yes | Yes | Yes | Yes |
Diferenciadores clave
- Single-channel high-side driver with integrated protection (frente a L9958)
- AEC-Q100 qualified for automotive (frente a BTS7002-1EPA)
- Wide supply voltage range (frente a VN7003AH)
Notas de diseño
The L9957 in PowerSO-20 package requires adequate PCB copper area for heat dissipation. For continuous currents above 5A, ensure at least 1 square inch of copper on the exposed pad and surrounding area. Use thermal vias to connect to inner layers. The thermal resistance junction-to-ambient is typically 30°C/W with proper layout.
Place a 100nF ceramic capacitor close to the VS pin and a 10µF electrolytic capacitor for bulk decoupling. The diagnostic output should have a 10kΩ pull-up resistor to the microcontroller supply. Keep the input signal trace short and shielded to avoid noise coupling.
When driving inductive loads, ensure the L9957's internal clamping handles the back-EMF. Do not exceed the absolute maximum supply voltage of 40V. The diagnostic output is open-drain, so a pull-up resistor is mandatory. Avoid floating the input pin; use a pull-down resistor to keep the output off during microcontroller reset.
Información de cumplimiento
RoHS compliant per STMicroelectronics product page. AEC-Q100 qualified for automotive applications.
