NS4250 is a second-generation ultra long endurance 2X3W intelligent audio amplifier.
The amplifier has AB/D class working mode switching function, ultra-low EMI, no filter required, and 3W dual channel output. In addition, when the headphone plug is connected to the jack, the audio power amplifier drives the stereo headphones in a single ended working mode. Switch the chip between AB or D operating modes through a control pin to match different application environments. Even when operating in Class D mode, NS4250 utilizes advanced technology to greatly reduce EMI interference across the full bandwidth range, minimizing the impact on other components. To simplify the design of the audio system, the bridge connected speaker amplification mode and single ended stereo headphone amplification mode of NS4250 are both implemented on the same chip.
    The NS4250's filter free PWM modulation structure and built-in feedback resistor reduce external components, PCB area, and system costs. NS4250 has built-in overcurrent protection, overheat protection, and undervoltage protection functions, effectively protecting the chip from damage in abnormal working conditions. And utilizing spread spectrum technology to fully optimize the new circuit design, with an efficiency of up to 90%, it is more suitable for mobile phones and other portable audio products.
    NS4250 provides SOP16 packaging with a rated operating temperature range of -40 ℃ to 85 ℃.

NS4250 Feature：

AB/D working mode switching function
3W output power
0.1% THD (1W output power, 5V power supply)
Excellent full bandwidth EMI suppression capability
Excellent "power on, power off" noise suppression
Efficiency of over 90% (D-class working mode)
High PSRR: -80dB (217Hz)
Working voltage range: 3.0V~5.5V
Overcurrent protection, overheating protection, undervoltage protection
Stereo headphone amplification mode
NS4250 provides SOP16 packaging

NS4250 Pin definition：

NS4250 Principle diagram：

NS4250 Packaging diagram：