TDF8546TH/N2,118

Overview

The TDF8546TH/N2,118 is a complementary quad Bridge-Tied Load (BTL) audio power amplifier manufactured by NXP USA Inc. It operates within a supply voltage range of 6 V to 18 V and utilizes an I2C-bus interface for control and diagnostics. The device delivers up to 45 W per channel into a 4 Ω load at 15.2 V and up to 64 W per channel into a 2 Ω load at 14.4 V. It features a patented best efficiency mode that reduces power dissipation significantly compared to standard BTL configurations. The amplifier includes comprehensive protection mechanisms such as thermal pre-warning, clip detection, and start-up diagnostics.

Feature Summary

• Patented best efficiency mode utilizing all four channels to reduce power dissipation
• Full I2C-bus controlled diagnostics including start-up and speaker fault detection
• Operates without audible disturbance during engine start at battery voltages as low as 6 V
• Complementary DMOS output stage in SOI-based BCD process for robust performance

Applications

• Automotive stop/start-car audio systems
• Car radio power amplification
• Infotainment system audio processing

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to ensure compatibility with required packaging and lead times. Confirm RoHS compliance status and environmental declarations prior to integration. Cross-reference the part number with official distributor catalogs to validate availability and sourcing channels.

Selection Notes

Select this component for automotive applications requiring high-efficiency amplification with minimal heat dissipation. Ensure the design supports the 36-HSOP package thermal requirements. Verify that the host controller can manage the I2C-bus interface and hardware-programmable addresses. Check that the power supply can maintain stability down to 6 V for engine start operations.

Part Context

The TDF8546 series represents a generation of complementary quad BTL audio power amplifiers designed specifically for automotive environments. The TH variant utilizes a 36-lead HSOP package. This family integrates advanced diagnostic capabilities and efficient switching techniques to meet the stringent demands of modern vehicle audio systems while maintaining sound quality.

Replacement Considerations

TDF8546J/N2ZU

FAQ

How does the best efficiency mode reduce power dissipation?

It uses a patented switch technique that processes audio information from all four channels simultaneously rather than just front or rear signals, reducing dissipation by more than 65% for correlated signals.

What is the minimum operating voltage for engine start support?

The amplifier can operate at a battery voltage as low as 6 V, allowing it to keep functioning without audible disturbance during engine start.

Does the device support legacy modes without I2C-bus?

Yes, the TDF8546 can operate in either legacy (non-I2C-bus) mode or I2C-bus mode, which is compliant with both 3.3 V and 5 V logic levels.