LM4917 Datasheet, PDF (1/25 Pages) National Semiconductor (TI) – Ground-Referenced, 95mW Stereo Headphone Amplifier

LM4917
www.ti.com
SNAS238G – AUGUST 2004 – REVISED MAY 2013
LM4917 Boomer™ Audio Power Amplifier Series Ground-Referenced, 95mW Stereo
Headphone Amplifier
Check for Samples: LM4917
FEATURES
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•23 Ground Referenced Outputs
• High PSRR
• Available in Space-Saving TSSOP Package
• Ultra Low Current Shutdown Mode
• Improved Pop and Click Circuitry eliminates
Noises During Turn-On and Turn-Off
Transitions
• 1.4 – 3.6V Operation
• No Output Coupling Capacitors, Snubber
Networks, Bootstrap Capacitors
• Shutdown Either Channel Independently
APPLICATIONS
• Notebook PCs
• Desktop PCs
• Mobile Phone
• PDAs
• Portable Electronic Devices
KEY SPECIFICATIONS
• Improved PSRR at 1kHz: 70dB (Typ)
• Power Output at V_DD = 3V, R_L = 16Ω, THD ≦
1%: 95mW (Typ)
• Shutdown Current: 0.01µA (Typ)
DESCRIPTION
The LM4917 is a stereo, output capacitor-less
headphone amplifier capable of delivering 95mW of
continuous average power into a 16Ω load with less
than 1% THD+N from a single 3V power supply.
The LM4917 provides high quality audio reproduction
with minimal external components. A ground
referenced output eliminates the output coupling
capacitors typically required by single-ended loads,
reducing component count, cost and board space
consumption. This makes the LM4917 ideal for
mobile phones and other portable equipment where
board space is at a premium. Eliminating the output
coupling capacitors also improves low frequency
response.
The LM4917 operates from a single 1.4V to 3.6V
power supply, features low 0.02% THD+N and 70dB
PSRR. Independent right/left channel low-power
shutdown controls provide power saving flexibility for
mono/stereo applications. Superior click and pop
suppression eliminates audible transients during start
up and shutdown. Short circuit and thermal overload
protection protects the device during fault conditions.
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Boomer is a trademark of Texas Instruments.
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All other trademarks are the property of their respective owners.
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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