The LA4440 (often referred to simply as the 4440 IC) is a dual-channel audio power amplifier that has gained legendary status in the electronics industry, particularly for DIY car stereos and home theater systems. Unlike the low-power LM386, the LA4440 is a “heavy hitter” in the analog audio world, capable of delivering 6W per channel in stereo mode or a massive 19W in bridge (monoblock) mode. It is highly regarded for its good channel separation, low distortion, and built-in protection features like thermal shutdown and overvoltage protection. Its unique 14-pin SIP (Single In-line Package) is designed to be easily bolted to a large heatsink, making it ideal for sustained high-power audio performance.
LA4440 Pinout (SIP-14H)
The LA4440 features a 14-pin Single In-line Package. When looking at the front of the IC (where the text is) with the pins pointing down, the numbering starts from left to right.
| Pin | Terminal | Function |
| 1 | NF1 | Feedback for Channel 1 |
| 2 | IN1 | Audio Input for Channel 1 |
| 3 | Pre-GND | Ground for the pre-amplifier stage |
| 4 | AB | Audio Bypass / Filter |
| 5 | NF2 | Feedback for Channel 2 |
| 6 | IN2 | Audio Input for Channel 2 |
| 7 | DC | DC Filtering |
| 8 | OUT2 | Audio Output for Channel 2 |
| 9 | BS2 | Bootstrap for Channel 2 |
| 10 | VCC | Positive Power Supply (Typically 12V – 13.2V) |
| 11 | BS1 | Bootstrap for Channel 1 |
| 12 | OUT1 | Audio Output for Channel 1 |
| 13 | P-GND | Power Ground for the output stage |
| 14 | NC | No Connection |
Technical Specifications
- Supply Voltage (VCC): 12V to 18V (Recommended 13.2V)
- Output Power (Bridge Mode): 19W (at 4Ω load)
- Output Power (Stereo Mode): 6W x 2 (at 4Ω load)
- Total Harmonic Distortion (THD): 0.1% (Typical)
- Channel Separation: 45 dB to 55 dB
- Quiescent Current: 40mA to 55mA
- Ripple Rejection: 46 dB
- Maximum Operating Temperature: 75°C (with heatsink)
Key Features & Benefits
- Dual Mode Flexibility: Can be used for a 2.0 stereo system or bridged for a high-power subwoofer (mono).
- Minimal External Components: Designed for simplicity, requiring very few capacitors and resistors to function.
- Low Pop Noise: Includes internal circuitry to minimize “thumping” sounds during power-on/off.
- Robust Protection: Built-in thermal protection prevents the IC from burning out during heavy use
Common Applications
- Car Audio Systems: Used as the primary amplifier for vehicle head units and door speakers.
- Portable Boomboxes: Ideal for high-volume outdoor portable speakers.
- Home Theater Systems: Serving as the power stage for budget-friendly 2.1 channel setups.
- Public Address (PA) Systems: Amplifying microphones for small halls or announcements.
LA4440 Equivalent & Substitutes
- LA4445 (Slightly higher power variant)
- TDA2003 (Mono alternative, would require two for stereo)
- TDA2030 (Hi-Fi alternative, requires different circuit layout)
- NTE1735 (Standard cross-reference replacement)
Related Tutorials on ElxHub
- Basics: Learn more in Integrated Circuits – Basics and Working
- Selection Guide: Compare power options in our Ultimate IC Selection Guide
Conclusion
The LA4440 remains one of the most reliable and searched-for audio ICs due to its raw power and simple implementation. While newer Class-D digital amplifiers are more efficient, the Class-AB warmth and durability of the LA4440 keep it relevant for anyone building high-volume analog audio gear. If you need a loud, punchy sound for a 12V system, the 4440 is the undisputed champion of its class.
Download the IC’s Datasheet pdf
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