LM4929 Datasheet, PDF (1/20 Pages) National Semiconductor (TI) – Stereo 40mW Low Noise Headphone Amplifier with OCL Output

LM4929
www.ti.com
SNAS293B – DECEMBER 2004 – REVISED APRIL 2013
LM4929 Boomer™ Audio Power Amplifier Series Stereo 40mW Low Noise Headphone
Amplifier with OCL Output
Check for Samples: LM4929
FEATURES
1
•23 OCL outputs — No DC Blocking Capacitors
• External Gain-Setting Capability
• Available in Space-Saving VSSOP Package
• Ultra Low Current Shutdown Mode
• 2V - 5.5V Operation
• Ultra Low Noise
APPLICATIONS
• Portable CD players
• PDAs
• Portable Electronics Devices
KEY SPECIFICATIONS
• PSRR at 217Hz and 1kHz
• Output Power at 1kHz with V_DD = 2.4V,
1% THD+N into a 16Ω load, 65dB (Typ)
• Output Power at 1kHz with V_DD = 3V,
1% THD+N into a 16Ω load, 25 mW (Typ)
• Shutdown current, 40 mW (Typ), 2.0µA (Max)
• Output Voltage change on release
from Shutdown V_DD = 2.4V, R_L = 16Ω, 1mV
(Max)
DESCRIPTION
The LM4929 is an stereo audio power amplifier
capable of delivering 40mW per channel of
continuous average power into a 16Ω load or 25mW
per channel into a 32Ω load at 1% THD+N from a 3V
power supply.
Boomer audio power amplifiers were designed
specifically to provide high quality output power with a
minimal amount of external components. Since the
LM4929 does not require bootstrap capacitors or
snubber networks, it is optimally suited for low-power
portable systems. The LM4929 is configured for OCL
(Output Capacitor-Less) outputs, operating with no
DC blocking capacitors on the outputs.
The LM4929 features a low-power consumption
shutdown mode with a faster turn on time.
Additionally, the LM4929 features an internal thermal
shutdown protection mechanism.
The LM4929 is unity gain stable and may be
configured with external gain-setting resistors.
1
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.
2
All other trademarks are the property of their respective owners.
3
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