LM4924 Datasheet, PDF (1/20 Pages) National Semiconductor (TI) – 2 Cell Battery, 40mW Per Channel Output Capacitor-Less(OCL) Stereo Headphone Audio Amplifier

LM4924
www.ti.com
SNAS272B – OCTOBER 2004 – REVISED APRIL 2013
LM4924 Boomer™ Audio Power Amplifier Series 2 Cell Battery, 40mW Per Channel
Output Capacitor-Less (OCL) Stereo Headphone Audio Amplifier
Check for Samples: LM4924
FEATURES
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•23 2-Cell 1.5V to 3.6V Battery Operation
• OCL Mode for Stereo Headphone Operation
• Unity-Gain Stable
• “Click and Pop” Suppression Circuitry for
Shutdown On and Off Transients
• Active Low Micropower Shutdown
• Thermal Shutdown Protection Circuitry
APPLICATIONS
• Portable Two-Cell Audio Products
• Portable Two-Cell Electronic Devices
KEY SPECIFICATIONS
• OCL Output Power
– (R_L = 16Ω, V_DD = 3.0V, THD+N = 1%),
40mW (Typ)
• Micropower Shutdown Current, 0.1µA (Typ)
• Supply Voltage Operating Range,
1.5V < V_DD < 3.6V
• PSRR 100Hz, V_DD = 3.0V, A_V = 2.5, 66dB (Typ)
DESCRIPTION
The LM4924 is a Output Capacitor-Less (OCL) stereo
headphone amplifier, which when connected to a
3.0V supply, delivers 40mW per channel to a 16Ω
load with less than 1% THD+N.
With the LM4924 packaged in the VSSOP and SON
packages, the customer benefits include low profile
and small size. These packages minimizes PCB area
and maximizes output power.
The LM4924 features circuitry that reduces output
transients (“clicks” and “pops”) during device turn-on
and turn-off, and Mute On and Off. An externally
controlled, low-power consumption, active-low
shutdown mode is also included in the LM4924.
Boomer audio power amplifiers are designed
specifically to use few external components and
provide high quality output power in a surface mount
packages.
Typical Application
Figure 1. Block Diagram
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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