LM4991
Overview
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 (Note 1). 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.
- Improved PSRR at 217kHz and 1kHz 64dB (typ)
- PO at VDD = 5.0V, 10% THD, 1kHz
- LM4991LD (only), 3Ω, 4Ω 3W (typ), 2.5W (typ)
- All packages, 8Ω load 1.5W (typ)
- Shutdown current 0.1µA (typ) Features Available in space-saving LLP and MA packages Ultra low current shutdown mode Can drive capacitive loads up to 500pF Improved pop & click circuitry reduces noises during turn-on and turn-off transitions
- 2.2 - 5.5V operation
- No output coupling capacitors, snubber networks, bootstrap capacitors or gain-setting resistors required
- Unity-gain stable n n n
