LM4951A_14 Datasheet, PDF (1/23 Pages) Texas Instruments – Wide Voltage Range 1.8 Watt Audio Amplifier With Short Circuit Protection

LM4951A
www.ti.com
SNAS453B – AUGUST 2008 – REVISED SEPTEMBER 2008
LM4951A
Wide Voltage Range 1.8 Watt Audio Amplifier
With Short Circuit Protection
Check for Samples: LM4951A
FEATURES
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•23 Pop & Click Circuitry Eliminates Noise During
Turn-On and Turn-Off Transitions
• Wide Supply Voltage Range: 2.7V to 9V
• Low Current, Active-Low Shutdown Mode
• Low Quiescent Current
• Thermal Shutdown Protection
• Short Circuit Protection
• Unity-Gain Stable
• External Gain Configuration Capability
APPLICATIONS
• Portable Devices
• Cell Phones
• Laptop Computers
• Computer Speaker Systems
• MP3 Player Speakers
KEY SPECIFICATIONS
• Wide Voltage Range 2.7V to 9V
• Quiescent Power Supply Current (V_DD = 7.5V)
2.5mA (typ)
• Power Output BTL at 7.5V, 1% THD
1.8 W (typ)
• Shutdown Current 0.01µA (typ)
• Fast Turn on Time 25ms (typ)
DESCRIPTION
The LM4951A is an audio power amplifier designed
for applications with supply voltages ranging from
2.7V up to 9V. The LM4951A is capable of delivering
1.8W continuous average power with less than 1%
THD+N into a bridge connected 8Ω load when
operating from a 7.5VDC power supply.
Boomer™ audio power amplifiers were designed
specifically to provide high quality output power with a
minimal amount of external components. The
LM4951A does not require bootstrap capacitors, or
snubber circuits.
The LM4951A features a low-power consumption
active-low shutdown mode. Additionally, the
LM4951A features an internal thermal shutdown
protection mechanism and short circuit protection.
The LM4951A contains advanced pop & click circuitry
that eliminates noises which would otherwise occur
during turn-on and turn-off transitions.
The LM4951A is unity-gain stable and can be
configured by external gain-setting resistors.
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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 © 2008, Texas Instruments Incorporated