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LN4890

Low-Cost, Mono/Stereo, 1 W Differential Audio Power Amplifiers

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LN4890

Low-Cost, Mono/Stereo, 1 W Differential Audio Power Amplifiers

■ General Description

The LN4890 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

LN4890 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 LN4890 features a low-power consumption shutdown

mode, which is achieved by driving the shutdown pin with

logic low. Additionally, the LN4890 features an internal

thermal shutdown protection mechanism. The LN4890

contains advanced pop & click circuitry which eliminates

noises which would otherwise occur during turn-on and

turn-off transitions. The LN4890 is unity-gain stable and

can be configured by external gain-setting resistors.

■ Key Specifications

 PSRR @fIN =217Hz, VDD = 5V

62dB(typ.)

 Power Output@VDD= 5.0V &1% THD 1W(typ.)

 Power Output @VDD=3.3V &1% THD 400mW(typ.)

 Shutdown Current

0.1μA(typ.)

■ Features

 Available in space-saving packages

 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 - 5.0V 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

■ Package

 MSOP-8

 SOP-8

■ Ordering Information

Ordering Number

LN4890MM

LN4890M

Package

MSOP-8

SOP-8

■ Operating Ratings

Temperature Range

TMIN ≤ TA ≤ TMAX----------------------------------------------------------------------------------------------------- −40°C ≤ TA ≤ 85°C

Supply Voltage ------------------------------------------------------------------------------------------------------------ 2.2V ≤ VDD ≤ 5.0V

Rev.1.0 —Nov. 24, 2011

1

www.natlinear.com

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