LM4891  Product Folder

The LM4891 is an audio power amplifier primarily designed for demanding applications in mobile phones and other portable communication device applications. It is capable of delivering 1 watt of continuous average power to an 8 BTL load with less than 1% distortion (THD+N) from a 5V_DC power supply.

Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components. The LM4891 does not require output coupling capacitors or bootstrap capacitors, and therefore is ideally suited for mobile phone and other low voltage applications where minimal power consumption is a primary requirement.

The LM4891 features a low-power consumption shutdown mode, which is achieved by driving the shutdown pin with logic high. Additionally, the LM4891 features an internal thermal shutdown protection mechanism.

The LM4891 contains advanced pop & click circuitry which eliminates noises which would otherwise occur during turn-on and turn-off transitions.

The LM4891 is unity-gain stable and can be configured by external gain-setting resistors.

• Available in space-saving packages: micro SMD, MSOP, SOIC, and LLP
• Ultra low current shutdown mode
• BTL output can drive capacitive loads
• Improved pop & click circuitry eliminates noises during turn-on and turn-off transitions
• 2.2 to 5.5V operation
• No output coupling capacitors, snubber networks or bootstrap capacitors required
• Thermal shutdown protection
• Unity-gain stable
• External gain configuration capability

• Mobile Phones
• PDAs
• Portable electronic devices