LM4890S

The LM4890S audio power amplifier is primarily designed for demanding mobile phone and other portable communication device applications. It is capable of delivering 0.5W of continuous average power into an 8Ω BTL load from a 5V DC supply with less than 1% distortion (THD+N). The Boomer audio power amplifier is designed to provide high-quality output power with a minimum number of external components. The LM4890 requires no output coupling capacitors or bootstrap capacitors, making it ideally suited for mobile phones and other low-voltage applications where minimum power consumption is a primary requirement. The LM4890S features a low-power shutdown mode, which is activated by driving the shutdown pin logic low. The LM4890S incorporates advanced pop & click suppression circuitry, eliminating the noise that would otherwise occur during power-on and power-off transitions. The LM4890S is unity-gain stable and can be configured via external gain-setting resistors.

Applications

• Mobile phones
• PDAs
• Portable electronic devices

Key features

• Space-saving package: miniature MSOP8
• Ultra-low current shutdown mode
• BTL output capable of driving capacitive loads
• Improved pop & click circuit eliminates noisy turn-on/turn-off transitions
• 2.2 - 5.5V operating voltage
• No output coupling capacitors, snubber networks, or bootstrap capacitors required
• 0.1uA current in power-down mode
• External gain configuration capability