Infineon TLF11251LDXUMA1 Dual-Channel High-Side Switch: Datasheet, Pinout, and Application Notes

The Infineon TLF11251LDXUMA1 represents a state-of-the-art dual-channel high-side switch engineered for robust performance in demanding automotive and industrial applications. This device integrates two independent channels capable of controlling various resistive, inductive, and capacitive loads with high precision and reliability. Its design focuses on providing enhanced diagnostic and protection features, making it a cornerstone for modern electronic systems requiring safe and efficient power management.

Datasheet Overview

The datasheet for the TLF11251LDXUMA1 highlights its key electrical and operational characteristics. The device operates from a supply voltage range of 3.0 V to 40 V, accommodating standard automotive battery systems. Each channel can deliver a continuous output current of up to 1.5 A, with a very low typical on-state resistance (RDS(on)) of 80 mΩ per channel, ensuring minimal power dissipation and high efficiency. Key features include comprehensive overtemperature protection, overcurrent shutdown, and reverse polarity protection. Additionally, it offers sophisticated diagnostic feedback, including open-load detection both in on and off states, and short-circuit reporting, communicated via a dedicated status pin.

Pinout Configuration

The TLF11251LDXUMA1 is housed in a compact and thermally efficient PG-DSO-14-47 package. The pinout is designed for optimized PCB layout and thermal management:

Pins 1, 2, 14: Channel 1 Input (IN1) and Status Output (ST1)

Pins 3, 4, 5, 6, 7, 8: Ground (GND) and Power Ground (PGND)

Pins 9, 10, 11: Channel 2 Input (IN2) and Status Output (ST2)

Pins 12, 13: Supply Voltage (VBB)

The central pins connected to the exposed die pad must be soldered to a large copper area on the PCB to act as a heat sink, which is critical for maximizing power dissipation and long-term reliability.

Application Notes

Implementing the TLF11251LDXUMA1 requires careful consideration of several factors. For inductive load driving, such as solenoids or motors, external flyback diodes are essential to clamp the voltage spikes generated during switch-off and protect the IC. The device's control is straightforward; applying a logic-high signal (≥ 3.5V) to the respective input pin (IN1 or IN2) activates the output channel. The status pin provides a current sink output to indicate fault conditions to a microcontroller.

PCB layout is critical for performance. Designers must use wide traces for the high-current paths (VBB and outputs) and ensure a low-impedance connection to ground. The exposed thermal pad must be connected to a substantial ground plane to effectively transfer heat away from the silicon. Furthermore, decoupling capacitors (e.g., 100 nF ceramic) placed close to the VBB and GND pins are mandatory to suppress supply noise and ensure stable operation.

ICGOODFIND Summary

The Infineon TLF11251LDXUMA1 is a highly integrated and protected dual-channel high-side switch, ideal for automotive body electronics and industrial control systems. Its combination of low RDS(on), extensive diagnostic capabilities, and robust protection mechanisms makes it an excellent choice for designers seeking to improve system reliability and efficiency while simplifying design complexity.

Keywords: High-Side Switch, Automotive Grade, Overcurrent Protection, Diagnostic Feedback, Low RDS(on)