LM48312

www.ti.com

SNAS494D – JANUARY 2010 – REVISED MAY 2013

LM48312 Boomer™ Audio Power Amplifier Series 2.6W, Ultra-Low EMI, Filterless, Mono

Class D Audio Power Amplifier with E2S

Check for Samples: LM48312

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FEATURES

DESCRIPTION

The LM48312 is a single supply, high efficiency,

23

•

Passes FCC Class B Radiated Emissions with

mono, 2.6W, filterless switching audio amplifier. The

20 Inches of Cable

LM48312

features

TI’s

Enhanced

Emissions

•

E2S System Reduces EMI While Preserving

Suppression (E2S) system, that features a unique

Audio Quality and Efficiency

patented ultra low EMI, spread spectrum, PWM

architecture, that significantly reduces RF emissions

•

Output Short Circuit Protection with Auto-

while preserving audio quality and efficiency. The E2S

Recovery

system

improves

battery

life,

reduces

external

•

No Output Filter Required

component count, board area consumption, and

•

Improved Audio Quality

system cost, simplifying design.

•

Minimum External Components

The LM48312 is designed to meet the demands of

•

Five Logic Selectable Gain Settings (0, 3, 6, 9,

portable multimedia devices. Operating from a single

12dB)

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

•

Click and Pop Suppression

allow operation from 2.4V to 5.5V. The LM48312

•

Available in Space-Saving DSBGA Package

features both a spread spectrum modulation scheme,

and an advanced, patented edge rate control (ERC)

architecture that significantly reduces emissions,

APPLICATIONS

while maintaining high quality audio reproduction

•

Mobile Phones

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

η = 88%).

•

PDAs

The LM48312 features high efficiency compared to

•

Laptops

conventional Class AB amplifiers, and other low EMI

Class D amplifiers. When driving an 8

Ω speaker from

KEY SPECIFICATIONS

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

at PO = 1W. The LM48312 features five gain settings,

•

Efficiency at 3.6V, 400mW into 8

Ω, 84% (Typ)

selected through a single logic input, further reducing

•

Efficiency at 5V, 1W into 8

Ω, 88% (Typ)

solution size. A low power shutdown mode reduces

•

Quiescent Power Supply Current at 5V, 3.1mA

supply current consumption to 0.01µA.

•

Power Output at VDD = 5V, RL = 4Ω

Advanced output short circuit protection with auto-

–

THD+N

≤ 10%, 2.6W (Typ)

recovery prevents the device from being damaged

during fault conditions. Superior click and pop

–

THD+N

≤ 1%, 2.1W (Typ)

suppression eliminates audible transients on power-

•

Power Output at VDD = 5V, RL = 8Ω

up/down and during shutdown.

–

THD+N

≤ 10%, 1.6W (Typ)

–

THD+N

≤ 1%, 1.3W (Typ)

•

Shutdown Current, 0.01

μA (Typ)

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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.

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Boomer is a trademark of Texas Instruments.

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All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2010–2013, 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.