HOME HOME SELECT DESIGN BUY EXPLORE About Us Support My Profile Search

 Products > Audio Products > Boomer Audio Power Amplifiers <6V,<3W > LM4991

LM4991  Product Folder

3W Audio Power Amplifier with Shutdown Mode
Generic P/N 4991
General
Description		 Features Datasheet Package
& Models		 Samples
& Pricing		 Reliability
Metrics

Parametric Table Parametric Table
Temperature Min (deg C) -40 
Temperature Max (deg C) 85 
Channels (Channels) 1 
User Supply (Volt) 5 
Supply Range +2.2 - +5.5 V 
PowerAtFourOhms OnePercentTHD (Watt) 2.10 
PowerAtEightOhms OnePercentTHD (Watt) 1.10 
PowerAtFourOhms TenPercentTHD (Watt) 2.50 
PowerAtEightOhms TenPercentTHD (Watt) 1.50 
SNR (dB) - 
SNR Conditions 64 
PSRR (dB) Vripple=0.2V sine p-p, input terminated with 10ohms, f=1kHz 
PSRR Conditions .20 
THD (%) Po=0.5W, f=1kHz 
THD Conditions No 
Audio Mux  

Datasheet

TitleSize in KbytesDate
View Online
Download
Receive via Email
LM4991 Boomer ® Audio Power Amplifier Series 3W Audio Power Amplifier with Shutdown Mode 543 Kbytes 21-May-03 View Online Download Receive via Email

If you have trouble printing or viewing PDF file(s), see Printing Problems.

Package Availability, Models, Samples & Pricing

Part NumberPackageStatusModelsSamples &
Electronic
Orders		Budgetary PricingStd
Pack
Size		Package
Marking
TypePinsMSL/Lead-Free AvailabilityLead
Time		QtySPICEIBISQty$US each
LM4991LDLLP8StatusFull productionN/AN/ASamples1K+$0.70reel
of
1000		NS
UZXYTT
L4991
8-11 weeks100000
LM4991LDXLLP8StatusFull productionN/AN/A 1K+$0.70reel
of
4500		NS
UZXYTT
L4991
8-11 weeks25000
LM4991MASOIC NARROW8StatusFull productionN/AN/ASamples
Buy Now		1K+$0.70rail
of
95		NSXYTT
LM49
91MA
6-8 weeks25000
LM4991MAXSOIC NARROW8StatusFull productionN/AN/A 1K+$0.70reel
of
2500		NSXYTT
LM49
91MA
6-8 weeks25000

General Description

The LM4991 is a mono bridged audio power amplifier capable of delivering 3W of continuous average power into a 3 load with less than 10% THD when powered by a 5V power supply . 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.

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.

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

Key Specification

Improved PSRR at 217kHz and 1kHz

64dB (typ)

PO at VDD = 5.0V, 10% THD, 1kHz

  

LM4991LD (only), 3, 4

3W (typ), 2.5W (typ)

All packages, 8 load

1.5W (typ)

Shutdown current

0.1µA (typ)

Applications

  • Wireless and cellular handsets
  • PDA's
  • Portable computers
  • Desktop computers

Reliability Metrics

Part Number Process Early Failure Rate - Rejects Sample Size (EFR) PPM * Rel. Rejects Device Hours Long Term Failure Rates (FITS) MTTF
LM4991LDCMOS721420014108000005226190940
LM4991LDXCMOS721420014108000005226190940
LM4991MACMOS721420014108000005226190940
LM4991MAXCMOS721420014108000005226190940

For more information on Reliablitity Metrics, please click here.


[Information as of 15-Jan-2004]

Website Guide • About "Cookies" • National is QS 9000 Certified • Privacy/Security Statement • Contact Us/Feedback
Site Terms & Conditions of Use • Copyright 2003© National Semiconductor Corporation