lm48312tlx National Semiconductor Corporation, lm48312tlx Datasheet

lm48312tlx

Manufacturer Part Number

lm48312tlx

Description

2.6w, Ultra-low Emi, Filterless, Mono Class D Audio Power Amplifier With E2s

Manufacturer

National Semiconductor Corporation

Datasheet

1.LM48312TLX.pdf (20 pages)

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

Amplifier with E

General Description

The LM48312 is a single supply, high efficiency, mono, 2.6W,

filterless switching audio amplifier. The LM48312 features

National’s Enhanced Emissions Suppression (E

that features a unique patented ultra low EMI, spread spec-

trum, PWM architecture, that significantly reduces RF emis-

sions while preserving audio quality and efficiency. The E

system improves battery life, reduces external component

count, board area consumption, and system cost, simplifying

design.

The LM48312 is designed to meet the demands of portable

multimedia devices. Operating from a single 5V supply, the

device is capable of delivering 2.6W of continuous output

power to a 4Ω load with less than 10% THD+N. Flexible power

supply requirements allow operation from 2.4V to 5.5V. The

LM48312 features both a spread spectrum modulation

scheme, and an advanced, patented edge rate control (ERC)

architecture that significantly reduces emissions, while main-

taining high quality audio reproduction (THD+N = 0.03%) and

high efficiency (η = 88%).

The LM48312 features high efficiency compared to conven-

tional Class AB amplifiers, and other low EMI Class D ampli-

fiers. When driving an 8Ω speaker from a 5V supply, the

device operates with 88% efficiency at P

LM48312 features five gain settings, selected through a sin-

gle logic input, further reducing solution size. A low power

shutdown mode reduces supply current consumption to

0.01µA.

Advanced output short circuit protection with auto-recovery

prevents the device from being damaged during fault condi-

tions. Superior click and pop suppression eliminates audible

transients on power-up/down and during shutdown.

Boomer® is a registered trademark of National Semiconductor Corporation.

301107

= 1W. The

S) system,

LM48312

■

Key Specifications

Features

■

Applications

■

Efficiency at 3.6V, 400mW into 8Ω

Efficiency at 5V, 1W into 8Ω

Quiescent Power Supply Current at 5V

Power Output at V

Shutdown current

Passes FCC Class B Radiated Emissions with 20 inches

of cable

and Efficiency

Output Short Circuit Protection with Auto-Recovery

No output filter required

Improved Audio Quality

Minimum external components

Five Logic Selectable Gain Settings (0, 3, 6, 9, 12dB)

Low Power Shutdown Mode

Click and Pop suppression

Available in space-saving microSMD package

Mobile phones

PDAs

Laptops

THD+N

S System Reduces EMI while Preserving Audio Quality

≤

10%

= 5V, R

= 4Ω

= 8Ω

March 19, 2010

www.national.com

0.01μA (typ)

2.6W (typ)

2.1W (typ)

1.6W (typ)

1.3W (typ)

84% (typ)

88% (typ)

3.1mA

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