LM4906, LM4906LDBD, LM4906MMBD

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SNAS191E – APRIL 2003 – REVISED MAY 2013

LM4906

1W, Bypass-Capacitor-less Audio Amplifier with

Internal Selectable Gain

Check for Samples: LM4906, LM4906LDBD, LM4906MMBD

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FEATURES

DESCRIPTION

The LM4906 is an audio power amplifier primarily

2

•

Selectable Gain of 6dB (2V/V) or 12dB (4V/V)

designed

for

demanding

applications

in

mobile

•

No Output or PSRR Bypass Capacitors

phones and other portable communication device

Required

applications. It is capable of delivering 1W of

•

Improved “Click and Pop” Suppression

continuous average power to an 8

Ω BTL load with

less than 1% distortion (THD+N) from a +5V power

Circuitry

supply.

•

Very Fast Turn on Time: 5ms (Typ)

The LM4906 is the first Texas Instruments Boomer

•

Minimum External Components

Power Amplifier that does not require an external

•

2.6 - 5.5V Operation

PSRR bypass capacitor. The LM4906 also has an

•

BTL Output Can Drive Capacitive Loads

internal selectable gain of either 6dB or 12dB. In

addition, no output coupling capacitors or bootstrap

•

Ultra Low Current Shutdown Mode (SD Low)

capacitors are required which makes the LM4906

ideally suited for cell phone and other low voltage

APPLICATIONS

portable applications.

•

Portable Computers

The LM4906 contains advanced pop and click

•

Desktop Computers

circuitry that eliminates noise, which would otherwise

•

Multimedia Monitors

occur during turn-on and turn-off transitions.

Boomer

audio

power

amplifiers

were

designed

KEY SPECIFICATIONS

specifically to provide high quality output power with a

•

Improved PSRR at 217Hz for +3V: 71 dB

minimal

amount

of

external

components.

The

LM4906

features

a

low

-power

consumption

•

Power Output at +5V, THD+N = 1%, 8

Ω: 1.0 W

shutdown mode (the part is enabled by pulling the SD

(Typ)

pin high). Additionally, the LM4906 features an

•

Power Output at +3V, THD+N = 1%, 8

Ω: 390

internal thermal shutdown protection mechanism.

mW (Typ)

•

Total Shutdown Power Supply Current: 0.1µA

(Typ)

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

2

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PRODUCTION DATA information is current as of publication date.

Copyright © 2003–2013, 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.