LM4901MMX Datasheet, PDF (1/25 Pages) Texas Instruments – 1.6 Watt Audio Power Amplifier with Selectable Shutdown Logic Level

LM4901
www.ti.com
SNAS139F – DECEMBER 2001 – REVISED DECEMBER 2001
LM4901
1.6 Watt Audio Power Amplifier with Selectable
Shutdown Logic Level
Check for Samples: LM4901
FEATURES
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•2 Available in Space-Saving Packages: WSON
and VSSOP
• Ultra Low Current Shutdown Mode
• BTL Output can Drive Capacitive Loads
• Improved Pop & Click Circuitry Eliminates
Noise During Turn-On and Turn-Off
Transitions
• 2.0 - 5.5V Operation
• No Output Coupling Capacitors, Snubber
Networks or Bootstrap Capacitors Required
• Unity-Gain Stable
• External Gain Configuration Capability
• User Selectable Shutdown High or Low logic
Level
APPLICATIONS
• Mobile Phones
• PDAs
• Portable Electronic Devices
KEY SPECIFICATIONS
• Improved PSRR at 217Hz & 1KHz 62 dB
• Power Output at 5.0V, 1% THD, 4Ω 1.6 W (typ)
• Power Output at 5.0V, 1% THD, 8Ω 1.07 W (typ)
• Power Output at 3.0V, 1% THD, 4Ω 525 mW
(typ)
• Power Output at 3.0V, 1% THD, 8Ω 390 mW
(typ)
• Shutdown Current 0.1μA (typ)
DESCRIPTION
The LM4901 is an audio power amplifier primarily
designed for demanding applications in mobile
phones and other portable communication device
applications. It is capable of delivering 1 watt of
continuous average power to an 8Ω BTL load and 1.6
watts of continuous avearge power to a 4Ω BTL load
with less than 1% distortion (THD+N) from a 5V_DC
power supply.
Boomer audio power amplifiers were designed
specifically to provide high quality output power with a
minimal amount of external components. The
LM4901 does not require output coupling capacitors
or bootstrap capacitors, and therefore is ideally suited
for mobile phone and other low voltage applications
where minimal power consumption is a primary
requirement.
The LM4901 features a low-power consumption
shutdown mode. To facilitate this, Shutdown may be
enabled by either logic high or low depending on
mode selection. Driving the shutdown mode pin either
high or low enables the shutdown pin to be driven in
a likewise manner to enable shutdown.
The LM4901 contains advanced pop and click
circuitry which eliminates noise which would
otherwise occur during turn-on and turn-off
transitions.
The LM4901 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.
All trademarks are the property of their respective owners.
2
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 © 2001, Texas Instruments Incorporated