LTK8002D PDF Datasheet – Class-AB Audio Amplifier

This post explains for the Audio Amplifier. A Class-AB audio amplifier is a type of electronic amplifier that’s commonly used to amplify audio signals for driving speakers. It’s a compromise between the high efficiency of Class D amplifiers and the low distortion of Class A amplifiers. Class-AB amplifiers are widely employed in various audio applications due to their good balance between power efficiency and sound quality.

The Part Number is LTK8002D.

The function of this IC is Class-AB Audio Amplifier.

The package : SOP 8 Pin Type



LTK8002D datasheet circuit diagram


This device is a 3W, mono AB audio power amplifier chip. The working voltage is 2V-5V, and the BTL bridge connection mode can provide 4Ω load with a THD less than 10% and an average output power of 3.0W under a 5V power supply voltage. In shutdown mode, the current typical value is less than 0.5uA.

LTK8002D is specially designed to provide high-power, high-fidelity audio output. It only requires a small number of peripheral components and can work under low voltage conditions (2V-5V). LTK8002D does not require coupling capacitors, bootstrap capacitors or buffer networks, so it is very suitable for low-volume, low-power systems.

Class-AB audio amplifiers are commonly used in home audio systems, car audio systems, professional audio equipment, and more. They’re suitable for applications where a good balance between power efficiency and sound quality is desired.


LTK8002D datasheet amplifier


1. Built-in switch popping suppression circuit

2. 10% THD+N, VDD=5V, under 4Ω load, provide Up to 2.9W output power

3. 10% THD+N, VDD=5V, 8Ω load, provide Up to 1.8W output power

4. Shut-off current <0.5uA

5.  Package mode: SOP-8

6. Overheat protection


1. Plug-in speaker

2. Bluetooth speaker

3. Lithium battery amplifier

4. FM player

LTK8002D PDF Datasheet

FT2820 PDF Datasheet – 4W, Class-G Audio Power Amplifier

A Class-G audio power amplifier is a type of electronic amplifier designed to efficiently deliver high-quality audio signals to speakers or other audio devices. It combines characteristics of both Class-AB and Class-H amplifiers to improve efficiency and reduce power dissipation, especially when amplifying audio signals with varying levels.

Part Number: FT2820

Function: 4W Dual-Pump Class-G Audio Power Amplifier

Package: TSSOP-20L Type

Manufacturer: Fangtek

Images:FT2820 pdf amplifier


The FT2820 is a 4W boosted Class-G audio power amplifier based upon a proprietary Dual-PumpTM topology with automatic level control (ALC). It operates from 3V to 5.5V supply. When operating with a 4.2V supply voltage, it is capable of driving a 4Ω speaker load at a continuous average output of 4W with 10% THD+N. Its high efficiency, up to 82%, helps extend battery life for portable device applications.

In ft-2820, the power supply rail for the amplifier’s output stage is internally boosted and regulated at 6V by an adaptive charge pump based upon the Dual-PumpTM topology, thus allowing for a much louder audio output than a stand-alone one directly connected to the battery. It makes ft2820 an ideal audio solution for portable devices that are powered by a single-cell lithium battery while requiring higher audio loudness.  […]

FT2820 datasheet pinout


1 Proprietary Dual-PumpTM topology

2. Filterless Class-G operation with an integrated charge pump

3. Automatic level control to eliminate output clipping

4. Integrated lowpass filter for out-of-band noise rejection

5.  Maximum output power : 4W (VDD=4.2V, RL=4Ω, THD+N=10%, ALC Off)

6. Constant output power : 3.3W (VDD=4.2V, RL=4Ω, THD+N=0.5%, ALC On)

7. High power efficiency up to 82%


1. Portable Speakers

2. MID

3. Mobile Phones

FT2820 PDF Datasheet