LM48512

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SNAS497A – OCTOBER 2010 – REVISED APRIL 2012

LM48512 Boomer® Audio Power Amplifier Series PowerWise® Boosted, Ultra Low-EMI,

Check for Samples: LM48512

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FEATURES

•

"Click and Pop" suppression

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•

APPLICATIONS

Audio Quality and Efficiency

•

Mobile phones

•

Integrated Boost Converter

•

Smart phones

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Supply Voltage Level Detection on Boost

Converter

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PDAs

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Low Power Shutdown Mode

DESCRIPTION

Part of National’s PowerWise family or products, the LM48512 delivers 1.8W into 8

Ω, while consuming 14.5mA

patented, ultra low EMI PWM architecture that significantly reduces RF emissions while preserving audio quality

and efficiency. LM48512 improves battery life, reduces external component count, board area consumption,

system cost, and simplifies design.

The LM48512 is designed to meet the demands of portable multimedia devices. The LM48512 features high

efficiency compared to other boosted amplifiers and low EMI Class D amplifiers. The LM48512 is capable of

driving an 8

Ω speaker to 5.5V levels (1.8W) from a 3.6V supply while operating at 82% efficiency. Flexible power

(ERC) architecture that further reduces emissions by minimizing the high frequency component of the device

output, while maintaining high quality audio reproduction (THD+N = 0.03%) and high efficiency. A low power

shutdown mode reduces supply current consumption to 0.04

μA.

The LM48512 features a battery-saving automatic gain control (AGC). The AGC detects the battery voltage and

reduces the gain of the amplifier to limit the output as the battery voltage decreases.

Superior click and pop suppression eliminates audible transients on power-up/down and during shutdown.

Table 1. Key Specifications

VALUE

UNIT

1.8

W (typ)

■ Efficiency at 3.6V, 800mW into 8Ω

82% (typ)

■ Quiescent Power Supply Current

14.5mA

at 3.6V

■ Shutdown current

0.04

μA (typ)

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PRODUCTION DATA information is current as of publication date.

Copyright © 2010–2012, 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.