LM48310

www.ti.com

SNAS430D – NOVEMBER 2007 – REVISED MAY 2013

LM48310

Ultra-Low EMI, Filterless, 2.6W, Mono, Class D

Check for Samples: LM48310

1

FEATURES

DESCRIPTION

The LM48310 is a single supply, high efficiency,

2

•

Passes FCC Class B Radiated Emissions with

mono, 2.6W, filterless switching audio amplifier. The

20 inches of cable

LM48310

features

TI’s

Enhanced

Emissions

•

Audio Quality and Efficiency

patent-pending ultra low EMI, spread spectrum, PWM

architecture, that significantly reduces RF emissions

•

Output Short Circuit Protection with Auto-

Recovery

system

improves

battery

life,

reduces

external

•

Stereo Class D Operation

component count, board area consumption, system

•

No Output Filter Required

cost, and simplifying design.

•

Internally Configured Gain (12dB)

The LM48310 is designed to meet the demands of

•

Synchronizable Oscillator for Multi-Channel

portable multimedia devices. Operating from a single

Operation

5V supply, the device is capable of delivering 2.6W of

continuous output power to a 4

Ω load with less than

•

Low Power Shutdown Mode

10% THD+N. Flexible power supply requirements

•

Minimum External Components

allow operation from 2.4V to 5.5V. The LM48310

•

"Click and Pop" Suppression

offers two logic selectable modulation schemes, fixed

frequency mode, and an EMI suppressing spread

•

Micro-Power Shutdown

spectrum

mode.

The

system

includes

an

•

Available in Space-Saving WSON Package

advanced, patent-pending edge rate control (ERC)

architecture

that

further

reduce

emissions

by

APPLICATIONS

minimizing the high frequency component of the

device output, while maintaining high quality audio

•

Mobile Phones

reproduction (THD+N = 0.03%) and high efficiency (

η

•

PDAs

= 88%). The LM48310 also features a SYNC_IN input

•

Laptops

and SYNC_OUT, which allows multiple devices to

operate

with

the

same

switching

frequency,

KEY SPECIFICATIONS

eliminating

beat

frequencies

and

any

other

interference caused by clock intermodulation.

•

Efficiency at 3.6V, 400mW into 8

Ω 85% (typ)

The LM48310 features high efficiency compared to

•

Efficiency at 5V, 1W into 8

Ω 88% (typ)

conventional Class AB amplifiers, and other low EMI

•

Quiescent Power Supply Current at 5V 3.2mA

Class D amplifiers. When driving and 8

Ω speaker

•

from a 5V supply, the device operates with 88%

10% 2.6W (typ)

internally set to 12dB, further reducing external

•

component count. A low power shutdown mode

10% 1.6W (typ)

reduces supply current consumption to 0.01

μA.

•

Shutdown current0.01

μA (typ)

Advanced output short circuit protection with auto-

recovery prevents the device from being damaged

during fault conditions. Superior click and pop

suppression eliminates audible transients on power-

up/down and during shutdown.

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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

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PRODUCTION DATA information is current as of publication date.

Copyright © 2007–2013, 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.