STMicroelectronics

L9338MD

L9338MD Description

The L9338MD from STMicroelectronics is a 4-channel low-side power driver designed for general-purpose switching applications. Housed in a 20-SOIC package, this obsolete but still relevant IC integrates N-channel MOSFETs with a 1:1 input-to-output ratio, enabling efficient load control. It operates across a 4.5V to 32V load voltage range and features a low Rds(on) of 1.7Ω (typical), minimizing power dissipation. The device requires no external supply voltage (Vcc/Vdd), simplifying system design. With over-temperature protection and a status flag for fault monitoring, it ensures reliable performance in demanding environments.

L9338MD Features

• Low-Side Configuration: Ideal for driving resistive, inductive, or capacitive loads.
• Robust Protection: Integrated over-temperature shutdown enhances system safety.
• Status Flag: Provides real-time fault detection, improving diagnostics.
• Wide Voltage Range: Supports 4.5V–32V loads, suitable for automotive and industrial applications.
• Low On-Resistance: 1.7Ω Rds(on) reduces conduction losses.
• No Vcc/Vdd Required: Eliminates the need for an additional power supply.
• RoHS3 & REACH Compliant: Meets environmental and regulatory standards.
• Surface-Mount (SOIC-20): Compact and PCB-friendly for space-constrained designs.

L9338MD Applications

The L9338MD excels in:

1. Automotive Systems: Driving relays, lamps, or solenoids in body control modules.
2. Industrial Automation: Controlling actuators, valves, or small motors.
3. Power Distribution: Managing multi-channel loads in power sequencing circuits.
4. Consumer Electronics: Enabling low-side switching in appliances or LED drivers.
   Its high-voltage tolerance and fault reporting make it particularly valuable in harsh or safety-critical environments.

Conclusion of L9338MD

While marked obsolete, the L9338MD remains a versatile, high-performance power driver for legacy designs or niche applications. Its low Rds(on), wide voltage range, and integrated protections offer a balance of efficiency and reliability. Engineers seeking a no-frills, robust solution for multi-channel low-side switching may find this IC advantageous, though newer alternatives should be evaluated for long-term projects.

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