1FEATURES

23• E2S System Reduces EMI Preserving Audio

Quality and Efficiency

• Output Short Circuit Protection

• Stereo Class D Operation

• No Output Filter Required

• Texas Instruments 3D Enhancement

• Minimum External Components

• Click and Pop Suppression

• Micro-Power Shutdown

• Available in Space-Saving Approximately 2mm

x 2.2mm DSBGA Package

APPLICATIONS

• Mobile Phones

• PDAs

• Laptops

KEY SPECIFICATIONS

• Quiescent Power Supply Current at 3.6V

Supply 4mA (Typ)

• Power Output at VDD = 5V, RL = 8Ω, THD ≤ 1%

1.2 W (Typ)

• Shutdown Current 0.03μA (Typ)

• Efficiency at 3.6V, 100mW into 8Ω 80% (Typ)

• Efficiency at 3.6V, 500mW into 8Ω 80% (Typ)

• Efficiency at 5V, 1W into 8Ω 86% (Typ)

DESCRIPTION

The LM48413 is a single supply, high efficiency,

1.2W/channel, filterless switching audio amplifier. The

LM48413 features Texas Instruments' Enhanced

Emissions Suppression (E2S) system - a unique

patented ultra low EMI, spread spectrum, PWM

architecture. It significantly reduces RF emission

while preserving audio quality and efficiency. The E2S

system improves battery life, reduces external

component count, board area consumption, system

cost and product design cycle time. The LM48413TL

is available in a micro-SMD package, further saving space.

The LM48413 is designed to meet the demands of

mobile phones and other portable communication

devices. Operating from a single 5V supply, the device is capable of delivering 1.2W/channel of

continuous output power to a 8Ω load with less than

1% THD+N. Flexible power supply requirements

allow operation from 2.4V to 5.5V. The wide band

spread spectrum architecture of the LM48413

reduces EMI-radiated emissions due to the modulator

frequency.

The LM48413 features high efficiency compared with

conventional Class AB amplifiers. The E2S system

includes an advanced, patent-pending edge rate

control (ERC) architecture that further reduce

emissions by minimizing the high frequency

components of the device output, while maintaining

its high quality audio reproduction and high efficiency

(η = 85% at VDD = 3.6V, PO = 500mW). The LM48413

also includes Texas Instruments' 3D audio enhancement that improves stereo sound quality. In

devices where the left and right speakers are in close

proximity, 3D enhancement affects channel

specialization, widening the perceived soundstage.

Output short circuit protection prevents the device

from being damaged during fault conditions. Superior

click and pop suppression eliminates audible

transients on power up/down and during shutdown.

Shutdown control also provided to maximizes power

savings.