LM4890

www.ti.com

SNAS138L – SEPTEMBER 2001 – REVISED MAY 2013

LM4890

1 Watt Audio Power Amplifier

Check for Samples: LM4890

1

FEATURES

DESCRIPTION

The LM4890 is an audio power amplifier primarily

2

•

Available in Space-Saving Packages: DSBGA,

designed

for

demanding

applications

in

mobile

VSSOP, SOIC, and WSON

phones and other portable communication device

•

Ultra Low Current Shutdown Mode

applications. It is capable of delivering 1 watt of

•

BTL Output Can Drive Capacitive Loads

continuous average power to an 8

Ω BTL load with

•

Improved Pop & Click Circuitry Eliminates

supply.

Noises During Turn-On and Turn-Off

Transitions

Boomer

audio

power

amplifiers

were

designed

specifically to provide high quality output power with a

•

2.2 - 5.5V Operation

minimal

amount

of

external

components.

The

•

No Output Coupling Capacitors, Snubber

LM4890 does not require output coupling capacitors

Networks or Bootstrap Capacitors Required

or bootstrap capacitors, and therefore is ideally suited

•

Thermal Shutdown Protection

for mobile phone and other low voltage applications

where minimal power consumption is a primary

•

Unity-Gain Stable

requirement.

•

External Gain Configuration Capability

The LM4890 features a low-power consumption

shutdown mode, which is achieved by driving the

APPLICATIONS

shutdown pin with logic low. Additionally, the LM4890

•

Mobile Phones

features an internal thermal shutdown protection

•

PDAs

mechanism.

•

Portable Electronic Devices

The LM4890 contains advanced pop & click circuitry

which eliminates noises which would otherwise occur

KEY SPECIFICATIONS

during turn-on and turn-off transitions.

•

PSRR at 217Hz, VDD = 5V (Fig. 1): 62dB(typ.)

The

LM4890

is

unity-gain

stable

and

can

be

configured by external gain-setting resistors.

•

Power Output at 5.0V & 1% THD: 1W(typ.)

•

Power Output at 3.3V & 1% THD: 400mW(typ.)

•

Shutdown Current: 0.1

μA(typ.)

1

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.

2

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2001–2013, 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.