LM4990

www.ti.com

SNAS184E – DECEMBER 2002 – REVISED MAY 2013

LM4990

2 Watt Audio Power Amplifier with Selectable

Shutdown Logic Level

Check for Samples: LM4990

1

FEATURES

DESCRIPTION

The LM4990 is an audio power amplifier primarily

2

•

Available in Space-Saving Packages: WSON,

designed

for

demanding

applications

in

mobile

Exposed-DAP MSOP-PowerPAD, VSSOP, and

phones and other portable communication device

DSBGA

applications. It is capable of delivering 1.25 watts of

•

Ultra Low Current Shutdown Mode

continuous average power to an 8

Ω BTL load and 2

watts of continuous average power (NGZ and DGQ

•

Improved Click and Pop Circuitry Eliminates

only) to a 4

Ω BTL load with less than 1% distortion

Noise During Turn-On and Turn-Off

(THD+N+N) from a 5VDC power supply.

Transitions

•

2.2 - 5.5V Operation

Boomer

audio

power

amplifiers

were

designed

specifically to provide high quality output power with a

•

No Output Coupling Capacitors, Snubber

minimal

amount

of

external

components.

The

Networks or Bootstrap Capacitors Required

LM4990 does not require output coupling capacitors

•

Unity-Gain Stable

or bootstrap capacitors, and therefore is ideally suited

for mobile phone and other low voltage applications

•

External Gain Configuration Capability

where minimal power consumption is a primary

•

User Selectable Shutdown High or Low Logic

requirement.

Level

The LM4990 features a low-power consumption

shutdown mode. To facilitate this, Shutdown may be

APPLICATIONS

enabled by either logic high or low depending on

•

Mobile Phones

mode selection. Driving the shutdown mode pin either

•

PDAs

high or low enables the shutdown pin to be driven in

a likewise manner to enable shutdown.

•

Portable Electronic Devices

The LM4990 contains advanced pop & click circuitry

KEY SPECIFICATIONS

which eliminates noise which would otherwise occur

during turn-on and turn-off transitions.

•

Improved PSRR at 217Hz & 1KHz: 62dB

The

LM4990

is

unity-gain

stable

and

can

be

•

Power Output at 5.0V, 1% THD+N,

configured by external gain-setting resistors.

–

4

Ω (NGZ and DGQ only): 2W (Typ)

•

Power Output at 5.0V, 1% THD+N, 8

Ω: 1.25W

(Typ)

•

Power Output at 3.0V, 1% THD+N, 4

Ω: 600mW

(Typ)

•

Power Output at 3.0V, 1% THD+N, 8

Ω: 425mW

(Typ)

•

Shutdown Current: 0.1µA (Typ)

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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2002–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.