TPA6139A2PW

Series:	DirectPath™
Packaging:	Bulk
Part Status:	Active
Type:	Class AB
Output Type:	Headphones, 2-Channel (Stereo)
Max Output Power x Channels @ Load:	25mW x 2 @ 32 Ohm
Voltage - Supply:	3 V ~ 3.6 V
Features:	Depop, Mute, Short-Circuit and Thermal Protection
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Supplier Device Package:	14-TSSOP
Package / Case:	14-TSSOP (0.173", 4.40mm Width)
Base Part Number:	TPA6138

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Introduction to TPA6139A2PW The TPA6139A2PW is a low power Class D audio amplifier from Texas Instruments. It is designed for portable multimedia and voice communications systems, and is ideal for use in highly integrated audio systems. The device is packaged in a small 5x5mm QFN package and is capable of delivering up to 600mW of output power into 8 Ohms loads. It operates with a supply voltage of 2.5V to 3.3V and has a Shutdown Mode with low quiescent current. The TPA6139A2PW is configured as a dual-channel amplifier, which provides a differential output when used in stereo mode.Application Field For TPA6139A2PWThe TPA6139A2PW is designed for audio applications such as portable multimedia and voice communication systems. It can be used in a wide range of audio applications including portable speakers, portable entertainment systems, headsets and musical instruments. It is an ideal solution for integrating audio amplification into low power systems, such as portable cell phones, PDAs, digital cameras and MP3 players. It can also be used in audio systems for automotive, industrial and medical applications. Its low quiescent current also makes it ideal for battery operated applications, where extended operation time is essential. Working Principle of TPA6139A2PW The TPA6139A2PW is a low power class D audio amplifier. It uses a pulse width modulation (PWM) topology for the amplification process, which requires less power to operate. In order to achieve a high-efficiency performance, it has a direct modulated output transistor, which works in tandem with a switch mode power supply driver. The power supply driver is capable of efficiently converting the supply voltage into an output voltage suitable for driving an 8 Ohm speaker. The device also has a thermal protection feature, which senses and disables the device in the event of over temperature. The TPA6139A2PW is designed for low power systems with a shutdown mode, which reduces the quiescent current to less than 0.1μA. It can deliver up to 600mW of power into 8 Ohms load and has a ground-referenced single-ended output. The device is stable for loads above 4Ω and capacitive loads up to 100μF. The device also has a selectable gain of -6dB or 0dB, which can be changed via an external pin. ConclusionThe TPA6139A2PW is an efficient low power class D audio amplifier from Texas Instruments. It is suitable for highly integrated audio systems, such as portable cell phones, PDAs, digital cameras and MP3 players. The amplifier has a Shutdown Mode with low quiescent current and can deliver up to 600mW of output power into 8 Ohms loads. It also has a ground-referenced single-ended output, built-in thermal protection and selectable gain. The TPA6139A2PW is an ideal solution for integrating high performance audio into low power systems.

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