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LM4854  Product Folder

1.9W Monaural, 85mW Stereo Headphone Audio Amplifier
Generic P/N 4854
General
Description		 Features Datasheet Package
& Models		 Samples
& Pricing

Parametric Table Parametric Table
Temperature Min (deg C) -40 
Temperature Max (deg C) 85 
Channels (Channels) 2 
User Supply (Volt) 5 
Supply Range +2.4 - +5.5 V 
PowerAtFourOhms OnePercentTHD (Watt) 1.70 
PowerAtEightOhms OnePercentTHD (Watt) 1.10 
PowerAtFourOhms TenPercentTHD (Watt) 2.10 
PowerAtEightOhms TenPercentTHD (Watt) 1.30 
SNR (dB) 90 
SNR Conditions Pout=900mW, RL=8 Ohms 
PSRR (dB) 63 
PSRR Conditions 1 kHz 
THD (%) .08 
THD Conditions Pout=.05W @ Vs=5V, R= 8 Ohms 
Audio Mux - 

Datasheet

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LM4854 Boomer ® Audio Power Amplifier Series 1.9W Monaural, 85mW Stereo Headphone Audio Amplifier 1440 Kbytes 4-Apr-03 View Online Download Receive via Email

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Package Availability, Models, Samples & Pricing

Part NumberPackageStatusModelsSamples &
Electronic
Orders		Budgetary PricingStd
Pack
Size		Package
Marking
TypePinsMSL/Lead-Free AvailabilityLead
Time		QtySPICEIBISQty$US each
LM4854IBLmicroSMD12StatusFull productionN/AN/ASamples
Buy Now		1K+$1.10reel
of
250		XYTT
I G54
6-8 weeks10000
LM4854IBLXmicroSMD12StatusFull productionN/AN/A 1K+$1.10reel
of
3000		XYTT
I G54
6-8 weeks10000
LM4854LDLLP14StatusFull productionN/AN/ASamples1K+$1.12reel
of
1000		NS
UZXYTT
L4854LD
6-8 weeks10000
LM4854LDXLLP14StatusFull productionN/AN/A 1K+$1.12reel
of
4500		NS
UZXYTT
L4854LD
6-8 weeks10000
LM4854MTTSSOP14StatusFull productionN/AN/ASamples1K+$1.06rail
of
94		NSZXYTT
L4854
MT
12-14 weeks10000
LM4854MTXTSSOP14StatusFull productionN/AN/A 1K+$1.06reel
of
2500		NSZXYTT
L4854
MT
12-14 weeks50000

General Description

The unity-gain stable LM4854 is both a mono differential output (for bridge-tied loads, or BTL) audio power amplifier and a single-ended (SE) stereo headphone amplifier. Operating on a single 5V supply, the mono BTL mode delivers 1.1W (typ) to an 8 load, 1.7W (typ) to a 4 load (Note 1) at 1% THD+N. In SE stereo mode, the amplifier will deliver 85mW to 32 loads. The LM4854 features a new circuit topology that suppresses output transients ('click and pops') and eliminates SE-mode output coupling capacitors, saving both component and board space costs. The LM4854 has three inputs: one pair for a two-channel stereo signal and the third for a single-channel mono input.

The LM4854 is designed for PDA, cellular telephone, notebook, and other handheld portable applications. It delivers high quality output power from a surface-mount package and requires few external components. Other features include an active-low micropower shutdown mode, an "instant-on" low power standby mode, and thermal shutdown protection.

The LM4854 is available in the very space-efficient 12-lead micro SMD, exposed-DAP LLP for higher power applications, and TSSOP packages.

Features

  • Fast 0.1ms (typ) and 1.0ms (max) turn-on and turn-off time
  • Eliminates SE amplifier output coupling capacitors
  • Advanced "click and pop" suppression circuitry
  • Stereo headphone amplifier mode
  • Low-power standby and ultra-low current micropower shutdown modes
  • Thermal shutdown protection circuitry
  • 2.4V to 5.5V operation
  • Unity-gain stable
  • Gain set with external resistors
  • Space-saving micro SMD package, exposed-DAP LLP, and TSSOP

Key Specification

LLP BTL output power (RL = 3.2 and THD+N = 1%) 
VDD = 3.0V1.0W (typ)
VDD = 5.0V1.9W (typ)
LLP BTL output power (RL = 4 and THD+N = 1%) 
VDD = 3.0V900mW (typ)
VDD = 5.0V1.7W (typ)
LLP BTL output power (RL = 8 and THD+N = 1%) 
VDD = 3.0V380mW (typ)
VDD = 5.0V1.1W (typ)
SE output power (RL = 32 and THD+N = 1.0%) 
VDD = 3.0V32mW (typ)
VDD = 5.0V93mW (typ)
Micropower shutdown supply current 
VDD = 3.0V0.005µA (typ)
VDD = 5.0V0.05µA (typ)
Standby supply current 
VDD = 3.0V16µA (typ)
VDD = 5.0V27µA (typ)
PSRR (f = 1kHz, 3.0V <= VDD <= 5.0V, (Fig. 1)) 
BTL60dB (typ)
SE66dB (typ)

Applications

  • PDAs
  • Notebook computers
  • Cellular phones
  • Handheld portable electronic devices
[Information as of 15-Jan-2004]

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