LM4991_15 Datasheet, PDF (1/22 Pages) Texas Instruments – 3W Audio Power Amplifier with Shutdown Mode

LM4991
www.ti.com
SNAS217A – MAY 2004 – REVISED APRIL 2013
LM4991
3W Audio Power Amplifier with Shutdown Mode
Check for Samples: LM4991
FEATURES
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•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 Gain-
Setting 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)
• P_O at V_DD = 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
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 (I_SD = 0.1µA,
typ) is activated when V_DD is 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
Application Information sections for further
information concerning the LM4991LD and
LM4991M.
Connection Diagrams
Top View
Top View
Figure 1. SOIC Package
See Package Number D0008A
Figure 2. WSON Package
See Package Number NGN0008A
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2004–2013, Texas Instruments Incorporated