Specification	LM4991MA/NOPB

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

LM4991 Series

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

Pricing

Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly

Distributor	Package	Quantity	$

Digikey	Tube	1	$ 1.21
		10	$ 1.08
		95	$ 0.87
		285	$ 0.82
		570	$ 0.72
Newark	Each	1	$ 2.45
		10	$ 2.28
		25	$ 2.12
		50	$ 2.03
		190	$ 1.91
		285	$ 1.82
		570	$ 1.78
Texas Instruments	TUBE	1	$ 1.42
		100	$ 1.09
		250	$ 0.81
		1000	$ 0.58

Description

General part information

LM4991 Series

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.

Documents

Technical documentation and resources

LM4991 3W Audio Power Amplifier with Shutdown Mode datasheet (Rev. A)

Data sheet