LM4991 Series

3.0-W, mono, analog input Class-AB audio amplifier

Catalog

3.0-W, mono, analog input Class-AB audio amplifier

Part	Mounting Type	Features	Output Type	Type	Package / Case	Package / Case [y]	Package / Case [x]	Operating Temperature [Max]	Operating Temperature [Min]	Supplier Device Package	Voltage - Supply [Max]	Voltage - Supply [Min]	Max Output Power x Channels @ Load [x]	Max Output Power x Channels @ Load
Texas Instruments LM4991MA/NOPB	Surface Mount	Depop Shutdown Thermal Protection	1-Channel (Mono)	Class AB	8-SOIC	3.9 mm	0.154 in	85 °C	-40 °C	8-SOIC	5.5 V	2.2 V	1	1.5 W
Texas Instruments LM4991MAX/NOPB	Surface Mount	Depop Shutdown Thermal Protection	1-Channel (Mono)	Class AB	8-SOIC	3.9 mm	0.154 in	85 °C	-40 °C	8-SOIC	5.5 V	2.2 V	1	1.5 W

Catalog

3.0-W, mono, analog input Class-AB audio amplifier

Key Features

• Available in Space-Saving WSON and SOIC PackagesUltra Low Current Shutdown ModeCan Drive Capacitive Loads up to 500pFImproved Click and Pop Circuitry Reduces Noises During Turn-On and Turn-Off Transitions2.2 - 5.5V OperationNo Output Coupling Capacitors, Snubber Networks, Bootstrap Capacitors or Gain-Setting Resistors RequiredUnity-Gain StableKey SpecificationsImproved PSRR at 217kHz and 1kHz: 64 dB (typ)POat VDD= 5.0V, 10% THD, 1kHzLM4991LD (only), 3Ω, 4Ω: 3W (typ), 2.5 W (typ)All packages, 8Ω load: 1.5 W (typ)Shutdown current: 0.1µA (typ)All trademarks are the property of their respective owners.Available in Space-Saving WSON and SOIC PackagesUltra Low Current Shutdown ModeCan Drive Capacitive Loads up to 500pFImproved Click and Pop Circuitry Reduces Noises During Turn-On and Turn-Off Transitions2.2 - 5.5V OperationNo Output Coupling Capacitors, Snubber Networks, Bootstrap Capacitors or Gain-Setting Resistors RequiredUnity-Gain StableKey SpecificationsImproved PSRR at 217kHz and 1kHz: 64 dB (typ)POat VDD= 5.0V, 10% THD, 1kHzLM4991LD (only), 3Ω, 4Ω: 3W (typ), 2.5 W (typ)All packages, 8Ω load: 1.5 W (typ)Shutdown current: 0.1µA (typ)All trademarks are the property of their respective owners.

Description

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). To conserve power in portable applications, the LM4991's micropower shutdown mode (ISD= 0.1µA, typ) is activated when VDDis applied to the SHUTDOWN pin. Boomer audio power amplifiers are designed specifically to provide high power, high fidelity audio output. They require few external components and operate on low supply voltages from 2.2V to 5.5V. 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. Additional LM4991 features include thermal shutdown protection, unity-gain stability, and external gain set. Note:An LM4991LD that has been properly mounted to a circuit board will deliver 3W into 3Ω (at 10% THD). The other package options for the LM4991 will deliver 1.5W into 8Ω (at 10% THD). See the sections for further information concerning the LM4991LD and LM4991M. 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). To conserve power in portable applications, the LM4991's micropower shutdown mode (ISD= 0.1µA, typ) is activated when VDDis applied to the SHUTDOWN pin. Boomer audio power amplifiers are designed specifically to provide high power, high fidelity audio output. They require few external components and operate on low supply voltages from 2.2V to 5.5V. 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. Additional LM4991 features include thermal shutdown protection, unity-gain stability, and external gain set. Note:An LM4991LD that has been properly mounted to a circuit board will deliver 3W into 3Ω (at 10% THD). The other package options for the LM4991 will deliver 1.5W into 8Ω (at 10% THD). See the sections for further information concerning the LM4991LD and LM4991M.