LM48520, LM48520TLBD

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SNAS367C – FEBRUARY 2008 – REVISED APRIL 2013

LM48520

Boosted Stereo Class D Audio Power Amplifier

with Output Speaker Protection and Spread Spectrum

Check for Samples: LM48520, LM48520TLBD

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FEATURES

DESCRIPTION

The LM48520 integrates a boost converter with a

2

•

Click and Pop Suppression

high efficiency Class D stereo audio power amplifier

•

Low 0.04

μA Shutdown Current

to provide up to 1W/ch continuous power into an 8

Ω

•

78% Efficiency

speaker when operating from 2.7V to 5.0V power

supply with boost voltage (PV1) of 5.0V. The

•

Filterless Class D

LM48520 utilizes a proprietary spread spectrum pulse

•

2.7V - 5.0V Operation

width

modulation

technique

that

lowers

RF

•

4 Adjustable Gain Settings

interference and EMI levels. The Class D amplifier is

a

low

noise,

filterless

PWM

architecture

that

•

Adjustable Output Swing Limiter with Soft

eliminates

the

output

filter,

reducing

external

Clipping

component count, board area, power consumption,

•

Speaker Protection

system cost, and simplifying design.

•

Short Circuit Protection on Audio Amps

The LM48520 is designed for use in mobile phones

•

Independent Boost and Amplifier Shutdown

and other portable communication devices. The high

Pins

(78%) efficiency extends battery life when compared

to Boosted Class AB amplifiers. The LM48520

APPLICATIONS

features a low-power consumption shutdown mode.

Shutdown may be enabled by driving the Shutdown

•

Mobile Phones

pin to a logic low (GND). Also, external leakage is

•

PDAs

minimized via control of the ground reference via the

•

Portable media

SW-OUT pin .

•

Cameras

The LM48520 has 4 gain options which are pin

selectable via Gain0 and Gain1 pins. Output short

•

Handheld games

circuit prevents the device from damage during fault

conditions.

Superior

click

and

pop

suppression

KEY SPECIFICATIONS

eliminates audible transients during power-up and

•

Quiescent Power Supply Current: 11.5 mA(typ)

shutdown.

•

Output Power (RL = 8Ω, THD+N ≤ 1%,

VDD = 3.3V,PV1 = 5.0V): 1.1 W(typ)

•

Shutdown Current: 0.04

μA(typ)

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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 © 2008–2013, 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.