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LM4990
www.ti.com
LM4990
SNAS184E – DECEMBER 2002 – REVISED MAY 2013
2 Watt Audio Power Amplifier with Selectable
Shutdown Logic Level
Check for Samples: LM4990
FEATURES
DESCRIPTION

The LM4990 is an audio power amplifier primarily
designed for demanding applications in mobile
phones and other portable communication device
applications. It is capable of delivering 1.25 watts of
continuous average power to an 8Ω BTL load and 2
watts of continuous average power (NGZ and DGQ
only) to a 4Ω BTL load with less than 1% distortion
(THD+N+N) from a 5VDC power supply.
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Available in Space-Saving Packages: WSON,
Exposed-DAP MSOP-PowerPAD, VSSOP, and
DSBGA
Ultra Low Current Shutdown Mode
Improved Click and Pop Circuitry Eliminates
Noise During Turn-On and Turn-Off
Transitions
2.2 - 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: 62dB
Power Output at 5.0V, 1% THD+N,
– 4Ω (NGZ and DGQ only): 2W (Typ)
Power Output at 5.0V, 1% THD+N, 8Ω: 1.25W
(Typ)
Power Output at 3.0V, 1% THD+N, 4Ω: 600mW
(Typ)
Power Output at 3.0V, 1% THD+N, 8Ω: 425mW
(Typ)
Shutdown Current: 0.1µA (Typ)
Boomer audio power amplifiers were designed
specifically to provide high quality output power with a
minimal amount of external components. The
LM4990 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 LM4990 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 LM4990 contains advanced pop & click circuitry
which eliminates noise which would otherwise occur
during turn-on and turn-off transitions.
The LM4990 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.
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 © 2002–2013, Texas Instruments Incorporated
LM4990
SNAS184E – DECEMBER 2002 – REVISED MAY 2013
www.ti.com
Connection Diagram
Figure 1. VSSOP Package – Top View
See Package Number DGK