LM48510_0710 NSC [National Semiconductor], LM48510_0710 Datasheet

LM48510_0710

Manufacturer Part Number

LM48510_0710

Description

Boosted Class D Audio Power Amplifier

Manufacturer

NSC [National Semiconductor]

Datasheet

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LM48510

Boosted Class D Audio Power Amplifier

General Description

The LM48510 integrates a boost converter with a high effi-

ciency mono, Class D audio power amplifier to provide 1.2W

continuous power into an 8Ω speaker when operating on a

3.3V power supply with boost voltage (PV

operating on a 3.3V power supply, the LM48510 is capable of

driving a 4Ω speaker load at a continuous average output of

1.7W with less than 1% THD+N. The Class D amplifier is a

low noise, filterless PWM architecture that eliminates the out-

put filter, reducing external component count, board area

consumption, system cost, and simplifying design.

The LM48510's switching regulator is a current-mode boost

converter operating at a fixed frequency of 0.6MHz.

The LM48510 is designed for use in mobile phones and other

portable communication devices. The high (76%) efficiency

extends battery life when compared to Boosted Class AB am-

plifiers. The LM48510 features a low-power consumption

shutdown mode. Shutdown may be enabled by driving the

Shutdown pin to a logic low (GND).

The gain of the Class D is externally configurable which allows

independent gain control from multiple sources by summing

the signals. Output short circuit and Thermal shutdown pro-

tection prevent the device from damage during fault condi-

tions. Superior click and pop suppression eliminates audible

transients during power-up and shutdown.

Typical Application

Boomer

is a registered trademark of National Semiconductor Corporation.

FIGURE 1. Typical LM48510 Audio Amplifier Application Circuit

201232

) of 5.0V. When

Key Specifications

Features

■

Applications

■

Click and Pop Suppression

Low 0.01μA Shutdown Current

76% Efficiency

Filterless Class D

2.7V - 5.0V operation (V

Externally configurable gain on Class D

Very fast turn on time: 17μs

Independent Boost and Amplifier shutdown pins

Mobile Phones

PDAs

Portable media

Cameras

Handheld games

Quiescent Power Supply Current

Output Power

Shutdown Current

= 8Ω, THD+N

= 3.3V, PV

= 5.0V)

≤

1%,

20123266

)

www.national.com

October 2007

0.01μA (typ)

1.2W (typ)

6mA (typ)

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