L9953XP - SPI Controlled 8-Channel Low-Side Driver | STMicroelectronics
料号： L9953XP ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $6.25 | $6.25 |
| 10 | $5.63 | $56.30 |
| 100 | $5.01 | $501.00 |
| 500 | $4.51 | $2,255.00 |
| 1,000 | $4.06 | $4,060.00 |
L9953XP 概述
A low-side driver is a type of power switch that connects the load to ground when activated, commonly used to control relays, solenoids, LEDs, and other actuators in automotive body control modules and industrial PLCs. In the system hierarchy, the L9953XP functions as a power management IC within the broader category of smart power switches, which integrate protection, diagnostics, and communication interfaces to simplify system design and enhance reliability. The SPI interface allows a microcontroller to configure each channel, read diagnostic status, and control output states with minimal GPIO usage.
Key features of the L9953XP include an SPI interface for advanced control and diagnostics, eight low-side outputs with overcurrent and overtemperature protection, and a built-in 16-bit CRC for robust communication. Each channel can be independently PWM-controlled, enabling dimming or proportional control of loads. The device also features a sleep mode with a quiescent current of less than 10 µA, making it ideal for battery-powered applications where standby power is critical. The PowerSO-36 package includes an exposed pad for enhanced thermal dissipation, allowing the device to handle continuous currents up to 1.2 A per channel without external heatsinking in most applications.
From a technical perspective, the L9953XP employs a smart power technology that integrates vertical power MOSFETs with CMOS logic and protection circuitry on a single die. This architecture enables precise current sensing and fast fault response, with a typical overcurrent threshold of 2.4 A per channel. The SPI interface operates at clock frequencies up to 5 MHz, supporting fast data transfer for real-time control. The device also includes a dedicated fail-safe input that can force all outputs off in the event of a microcontroller failure, enhancing system safety.
Typical applications include automotive body control modules for controlling exterior and interior lighting, relay drivers for power distribution, and industrial PLC output stages for driving solenoids and valves. The L9953XP's ability to handle inductive loads with built-in freewheeling protection makes it particularly suitable for relay and solenoid applications where back-EMF management is essential.
When designing with the L9953XP, ensure adequate decoupling on the power supply pins and place the exposed pad on a large copper area for thermal management. The SPI lines should be kept short and shielded to minimize noise, and the fail-safe input should be connected to a watchdog output for robust system monitoring.
直接替换替代料： L9953XP ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： L9953XP （相同外形与封装尺寸） ——差异在于 Number of Channels, Package.
快速对比工具——选择替代料号进行并排对比：
L9953
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
L9953XP-TR
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MC33879
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
TLE6228
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
L9953XP 最大额定值与电气特性
| Number of Channels | 8 |
| 输出类型 | Low-side |
| Maximum Output Current per Channel | 1.2 A |
| Supply Voltage (Logic) | 4.5 V to 5.5 V |
| Supply Voltage (Power) | 4.5 V to 28 V |
| 接口 | SPI (up to 5 MHz) |
| Overcurrent Threshold | 2.4 A (typical) |
| Quiescent Current (Sleep Mode) | 10 µA (max) |
| 工作温度范围 | -40°C to +150°C |
| 封装 | PowerSO-36 |
| 安装类型 | Surface Mount |
| AEC-Q100 Qualification | Grade 1 |
| RoHS 状态 | Compliant |
| Fail-Safe Input | Yes |
| PWM Capability | Yes (per channel) |
L9953XP 引脚配置
| 引脚 1 | OUT1 — Low-side output channel 1 |
| 引脚 2 | OUT2 — Low-side output channel 2 |
| 引脚 3 | OUT3 — Low-side output channel 3 |
| 引脚 4 | OUT4 — Low-side output channel 4 |
| 引脚 5 | OUT5 — Low-side output channel 5 |
| 引脚 6 | OUT6 — Low-side output channel 6 |
| 引脚 7 | OUT7 — Low-side output channel 7 |
| 引脚 8 | OUT8 — Low-side output channel 8 |
| 引脚 9 | GND — Ground |
| 引脚 10 | VCC — Logic supply voltage (5V) |
| 引脚 11 | VS — Power supply voltage (battery) |
| 引脚 12 | SCK — SPI clock input |
| 引脚 13 | SI — SPI data input |
| 引脚 14 | SO — SPI data output |
| 引脚 15 | CSN — SPI chip select (active low) |
| 引脚 16 | FSI — Fail-safe input (active low) |
| 引脚 17 | RST — Reset input (active low) |
| 引脚 18 | PWM — PWM input for all channels |
典型应用
L9953XP 适用于 6 应用s: Automotive Body Control Module, Industrial PLC Output Stage, Relay Driver for Power Distribution, LED Lighting Control, Solenoid and Valve Control, Smart Junction Box.
Automotive Body Control Module
The L9953XP is ideal for automotive body control modules (BCMs) where it drives exterior and interior lighting, relays, and solenoids. Its SPI interface allows a central microcontroller to manage multiple outputs with minimal wiring, while the AEC-Q100 Grade 1 qualification ensures reliable operation in harsh automotive environments. The device's overcurrent and overtemperature protection prevent damage to the module and loads, and the fail-safe input provides a hardware shutdown path in case of microcontroller failure. With 1.2 A per channel, it can directly drive most automotive bulbs and relays without external drivers, simplifying the BCM design and reducing component count.
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Industrial PLC Output Stage
In industrial programmable logic controllers (PLCs), the L9953XP serves as an output stage for driving solenoids, valves, and indicator lamps. Its 4.5 V to 28 V power supply range accommodates various industrial voltage rails, and the SPI interface enables efficient communication with the PLC's CPU. The device's built-in protection against overcurrent and overtemperature ensures robust operation in factory environments, while the PWM capability allows proportional control of valves for precise flow regulation. The PowerSO-36 package with exposed pad facilitates heat dissipation, making it suitable for continuous operation in control cabinets.
推荐
Relay Driver for Power Distribution
The L9953XP is well-suited for driving relays in power distribution systems, such as those found in smart junction boxes and fuse boxes. Each channel can drive a relay coil directly, with the built-in freewheeling protection handling the inductive kickback. The SPI interface allows the system to monitor relay status and detect faults, improving diagnostic capabilities. The device's low sleep current is beneficial for vehicles that need to minimize battery drain when parked. With its wide operating temperature range, the L9953XP can be placed near the engine compartment where temperatures are elevated.
推荐
LED Lighting Control
The L9953XP can be used to control LED lighting in automotive and industrial applications. Each channel can drive an LED string or module with PWM dimming, enabling dynamic lighting effects and energy savings. The device's overcurrent protection prevents damage from LED faults, and the SPI interface allows for individual channel control and diagnostics. The wide supply voltage range accommodates both 12V and 24V systems, making it versatile for various lighting applications. The compact PowerSO-36 package helps reduce PCB space in space-constrained lighting modules.
推荐
Solenoid and Valve Control
The L9953XP is ideal for controlling solenoids and valves in automotive and industrial systems, such as transmission control, fuel injection, and pneumatic actuators. Its 1.2 A per channel output can drive most solenoid coils directly, and the built-in freewheeling protection manages the inductive load. The SPI interface enables precise timing and sequencing of multiple solenoids, which is critical for applications like automatic transmissions. The device's fail-safe input provides a hardware shutdown in case of microcontroller failure, enhancing system safety. The AEC-Q100 Grade 1 qualification ensures reliable operation in high-temperature environments.
推荐
Smart Junction Box
In smart junction boxes, the L9953XP provides a centralized solution for controlling multiple loads such as lights, motors, and heaters. Its SPI interface allows a central controller to manage all outputs, reducing wiring complexity and enabling advanced diagnostics. The device's protection features prevent damage from short circuits and overloads, improving system reliability. The low sleep current is essential for reducing battery drain in vehicles, and the wide operating temperature range makes it suitable for under-hood applications. The PowerSO-36 package with exposed pad ensures efficient heat dissipation in the confined space of a junction box.
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推荐产品汇总
工程参考数据： L9953XP ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | L9953 | L9953XP-TR | MC33879 | TLE6228 |
|---|---|---|---|---|---|
| Package | PowerSO-36 | PowerSO-36 | PowerSO-36 | PowerSO-36 | PowerSO-36 |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | NXP Semiconductors | Infineon |
| Number of Channels | 8 | 8 | 8 | 8 | 8 |
| Output Current per Channel | 1.2 A | 1.2 A | 1.2 A | 0.6 A | 0.5 A |
| Supply Voltage (Power) | 4.5 V to 28 V | 4.5 V to 28 V | 4.5 V to 28 V | 5.5 V to 26 V | 4.5 V to 32 V |
| SPI Interface | Yes (up to 5 MHz) | Yes (up to 5 MHz) | Yes (up to 5 MHz) | Yes (up to 5 MHz) | Yes (up to 5 MHz) |
| CRC Protection | Yes | No | Yes | No | No |
| AEC-Q100 Qualification | Grade 1 | No | Grade 1 | Grade 1 | Grade 1 |
关键差异点
- CRC protection on SPI interface （对比 L9953)
- Higher output current per channel （对比 MC33879)
- AEC-Q100 Grade 1 qualification （对比 L9953)
设计说明
The L9953XP in PowerSO-36 package has an exposed pad that must be soldered to a large copper area on the PCB for effective heat dissipation. For continuous operation at 1.2 A per channel on all eight channels, the total power dissipation can reach several watts. Ensure the PCB copper area is at least 2 square inches to keep the junction temperature below the maximum rating. Use thermal vias to connect the exposed pad to inner and bottom layers for improved thermal performance.
Place a 100 nF ceramic capacitor close to the VCC pin and a 10 µF electrolytic capacitor near the VS pin to decouple the power supply. The SPI lines (SCK, SI, SO, CSN) should be routed with controlled impedance and kept short to minimize noise. Add series resistors (e.g., 22 Ω) on the SPI lines to reduce ringing. The fail-safe input (FSI) should be pulled up to VCC with a 10 kΩ resistor and connected to a watchdog output for robust system monitoring.
Do not exceed the absolute maximum ratings for VS (28 V) and VCC (5.5 V). Ensure the SPI communication is properly initialized with the correct CRC settings to avoid false diagnostics. When driving inductive loads, the built-in freewheeling protection handles back-EMF, but external flyback diodes may be needed for very large inductances. Avoid floating the FSI pin; always tie it to a defined logic level to prevent unintended shutdown.
合规信息
RoHS compliant per STMicroelectronics product page. AEC-Q100 Grade 1 qualified. Halogen-free status not specified in available data.