Texas Instruments LM4991
The LM4991 is a mono bridged audio power amplifier capable of delivering 3W of continuous average power into a 3Ω load with less than 10% THD when powered by a 5V power supply (see Note below). They require few external components and operate on low supply voltages from 2.2V to 5.5V. To conserve power in portable applications, the LM4991's micropower shutdown mode (ISD = 0.1µA, typ) is activated when VDD is applied to the SHUTDOWN pin.| Part No. | LM4991 |
|---|---|
| Datasheet | LM4991 Download |
| Manufacturer |  Texas Instruments |
| Description | 3W Audio Power Amplifier |
| Buy | Stock & Price |
FEATURES
1●2 Available in Space-Saving WSON and SOIC Packages
● Ultra Low Current Shutdown Mode
● Can Drive Capacitive Loads up to 500pF
● Improved Click and Pop Circuitry Reduces Noises During Turn-On and Turn-Off Transitions
● 2.2 - 5.5V Operation
● No Output Coupling Capacitors, Snubber Networks, Bootstrap Capacitors or GainSetting Resistors Required
● Unity-Gain Stable
APPLICATIONS
● Wireless and Cellular Handsets● PDAs
● Portable Computers
● Desktop Computers KEY SPECIFICATIONS
● Improved PSRR at 217kHz and 1kHz: 64 dB (typ)
● PO at VDD = 5.0V, 10% THD, 1kHz – LM4991LD (only), 3Ω, 4Ω: 3W (typ), 2.5 W (typ) – All packages, 8Ω load: 1.5 W (typ)
● Shutdown current: 0.1µA (typ)
DESCRIPTION
Boomer audio power amplifiers are designed specifically to provide high power, high fidelity audio output. Since the LM4991 does not require output coupling capacitors, bootstrap capacitors, or snubber networks, it is ideally suited for low-power portable systems that require minimum volume and weight.
