LM4890_15 Datasheet, PDF (1/36 Pages) Texas Instruments – 1 Watt Audio Power Amplifier

LM4890
www.ti.com
SNAS138L – SEPTEMBER 2001 – REVISED MAY 2013
LM4890
1 Watt Audio Power Amplifier
Check for Samples: LM4890
FEATURES
1
•2 Available in Space-Saving Packages: DSBGA,
VSSOP, SOIC, and WSON
• Ultra Low Current Shutdown Mode
• BTL Output Can Drive Capacitive Loads
• Improved Pop & Click Circuitry Eliminates
Noises During Turn-On and Turn-Off
Transitions
• 2.2 - 5.5V Operation
• No Output Coupling Capacitors, Snubber
Networks or Bootstrap Capacitors Required
• Thermal Shutdown Protection
• Unity-Gain Stable
• External Gain Configuration Capability
APPLICATIONS
• Mobile Phones
• PDAs
• Portable Electronic Devices
KEY SPECIFICATIONS
• PSRR at 217Hz, VDD = 5V (Fig. 1): 62dB(typ.)
• Power Output at 5.0V & 1% THD: 1W(typ.)
• Power Output at 3.3V & 1% THD: 400mW(typ.)
• Shutdown Current: 0.1μA(typ.)
DESCRIPTION
The LM4890 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 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
LM4890 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 LM4890 features a low-power consumption
shutdown mode, which is achieved by driving the
shutdown pin with logic low. Additionally, the LM4890
features an internal thermal shutdown protection
mechanism.
The LM4890 contains advanced pop & click circuitry
which eliminates noises which would otherwise occur
during turn-on and turn-off transitions.
The LM4890 is unity-gain stable and can be
configured by external gain-setting resistors.
1
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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.
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