The onsemi LA7213-E is a monolithic integrated circuit designed as a dual power amplifier for audio applications, primarily targeting car audio systems and portable audio equipment. It integrates two high-performance amplifiers in a single package, providing stereo output with low distortion, high signal-to-noise ratio (SNR), and thermal protection features. The device is optimized for medium-power audio amplification with minimal external components, making it suitable for compact, efficient audio designs. It supports wide supply voltage ranges and is designed for automotive environments, ensuring robust operation under fluctuating power conditions and high-temperature operation.

## Functional Description

The LA7213-E contains dual BTL (Bridge-Tied Load) audio power amplifiers designed for driving speakers directly:

* Two independent amplifier channels with bridge-tied load configuration for maximum output power without the need for output capacitors
* Integrated mute and standby functionality to minimize noise during power-on/off transitions
* Built-in thermal protection circuit prevents damage due to overheating in high-power operation
* Overvoltage and undervoltage detection ensures safe operation under fluctuating supply conditions
* Low total harmonic distortion (THD) and high SNR provide clear and high-fidelity audio reproduction
* Short-circuit protection on outputs enhances system reliability and protects external components
* Minimal external component requirement simplifies PCB layout and reduces design complexity

The device is suitable for automotive audio systems, multimedia players, portable audio amplifiers, and small stereo sound systems requiring compact and efficient audio amplification.

## Electrical Specifications

* Supply voltage (VCC): operating range from 6 V to 18 V, allowing compatibility with automotive 12 V and portable audio power sources
* Quiescent current (ICQ): 30 mA typical, reducing standby power consumption
* Output power: 7 W per channel at 14.4 V supply, 4 Ω load, THD+N = 10%
* Load resistance: designed for 4 Ω or 8 Ω speaker loads, supporting common audio transducers
* Total harmonic distortion (THD+N): 0.1% typical at 1 W output, 4 Ω load
* Signal-to-noise ratio (SNR): 90 dB typical, providing clear audio performance with minimal background noise
* Voltage gain: 26 dB typical, sufficient for intermediate amplification stages without additional preamplification
* Input voltage: 1 V RMS typical for full output swing, compatible with standard line-level audio signals
* Power dissipation: 15 W maximum, with internal thermal protection to prevent overheating
* Operating temperature range: -40°C to +85°C, suitable for automotive and industrial environments
* Storage temperature range: -55°C to +150°C
* Input impedance: 30 kΩ typical, minimizing loading on preceding audio circuitry

## Audio Performance Characteristics

* Wide frequency response: 20 Hz to 20 kHz, covering the full audible range with minimal attenuation
* Low crossover distortion due to complementary push-pull output design
* Fast slew rate: 8 V/µs typical, ensuring precise reproduction of transient audio signals
* Low output offset voltage: 10 mV typical, preventing DC bias on connected speakers
* Differential input configuration supports both single-ended and balanced audio signals
* High damping factor: >50 typical at 4 Ω load, ensuring controlled speaker response and minimizing resonance

## Protection and Reliability Features

* Thermal shutdown: internal circuitry disables amplifier outputs when junction temperature exceeds safe limits
* Output short-circuit protection: prevents damage in the event of accidental speaker shorting
* Supply voltage protection: tolerant to temporary voltage surges and dropouts common in automotive systems
* Mute and standby pins allow safe operation during power transitions, reducing audible clicks and pops
* Internal decoupling capacitors reduce susceptibility to supply noise and improve transient response
* Designed to meet automotive vibration and thermal cycling standards for robust long-term operation

## Thermal and Mechanical Characteristics

* Package: 24-pin Dual-In-Line Package (DIP) or Surface-Mount variant, facilitating easy PCB integration
* Thermal resistance junction-to-ambient (RthJA): 60°C/W typical without heatsink; improved thermal management achievable with PCB copper planes
* Compact footprint suitable for stereo amplification in confined spaces, including automotive dashboard systems
* Metal leadframe for efficient heat transfer from internal power transistors to PCB or attached heatsink
* RoHS-compliant package suitable for environmentally friendly manufacturing

## Applications

* Automotive audio amplifier systems for compact or mid-range speaker output
* Portable stereo systems, multimedia players, and docking stations
* Small-scale home audio amplifiers requiring low external component count
* Multimedia and infotainment systems in vehicles requiring reliable and high-fidelity audio output
* PA systems and signal amplification for embedded audio modules
* Applications requiring dual-channel amplification with thermal and short-circuit protection in a compact package

## Key Features Summary

* Dual-channel BTL audio power amplifier for stereo applications
* Supply voltage: 6 V to 18 V; output power: 7 W per channel at 14.4 V, 4 Ω load
* Total harmonic distortion: 0.1% typical; signal-to-noise ratio: 90 dB typical
* Voltage gain: 26 dB; input impedance: 30 kΩ typical
* Frequency response: 20 Hz to 20 kHz; slew rate: 8 V/µs typical
* Thermal shutdown, short-circuit protection, and supply voltage tolerance
* Mute and standby functions to reduce turn-on/off noise
* Load support: 4 Ω and 8 Ω speakers; high damping factor >50 typical
* Package: 24-pin DIP or surface-mount with thermal leadframe
* Applications: automotive and portable audio amplification, infotainment systems, multimedia devices, small PA and stereo systems

The LA7213-E provides a compact, efficient, and robust solution for medium-power audio amplification, integrating dual high-fidelity channels with protection features suitable for automotive and portable audio applications.