LM48411TLSLASHNOPB中文资料德州仪器数据手册PDF规格书

1FEATURES

2• E2S System Reduces EMI Preserving Audio

Quality and Efficiency

• Output Short Circuit Protection

• Stereo Class D Operation

• No Output Filter Required for Inductive Loads

• Logic Selectable Gain

• Independent Shutdown Control

• Minimum External Components

• Click and Pop Suppression Circuitry

• Micro-Power Shutdown Mode

• Available in Space-Saving 0.5mm Pitch

DSBGA Package

APPLICATIONS

• Mobile Phones

• PDAs

• Portable Electronic Devices

KEY SPECIFICATIONS

• Efficiency at 3.6V, 500mW into 8Ω Speaker:

87% (typ)

• Efficiency at 3.6V, 100mW into 8Ω Speaker:

80% (typ)

• Efficiency at 5V, 1W into 8Ω Speaker:

88% (typ)

• Quiescent Current, 3.6V Supply: 4.2mA (typ)

• Power Output at VDD = 5V RL = 4Ω, THD ≤ 10%:

2.5W (typ)

• Power Output at VDD = 5V RL = 8Ω, THD ≤ 10%:

1.5W (typ)

• Total Shutdown Power Supply Current:

0.01μA (typ)

• Single Supply Range: 2.4V to 5.5V

DESCRIPTION

The LM48411 is a single supply, high efficiency,

2.5W/channel Class D audio amplifier. The LM48411

features TI's Enhanced Emissions Suppression (E2S)

system, that features a unique patent-pending ultra

low EMI, spread spectrum, PWM architecture, that

significantly reduces RF emissions while preserving

audio quality and efficiency. The E2S system

improves battery life, reduces external component

count, board area consumption, system cost, and

simplifying design.

The LM48411 is designed to meet the demands of

mobile phones and other portable communication

devices. Operating on a single 5V supply, it is

capable of delivering 2.5W/channel of continuous

output power to a 4Ω load with less than 10%

THD+N. Its flexible power supply requirements allow

operation from 2.4V to 5.5V. The wide band spread

spectrum architecture of the LM48411 reduces EMIradiated

emissions due to the modulator frequency.

The LM48411 features high efficiency compared to a

conventional Class AB amplifier. The E2S system

includes an advanced, patent-pending edge rate control (ERC) architecture that further reduce

emissions by minimizing the high frequency

component of the device output, while maintaining

high quality audio reproduction and high efficiency (η

= 87% at VDD = 3.6V, PO = 500mW). Four gain

options are pin selectable through GAIN0 and GAIN1

pins.

The LM48411 features a low-power consumption

shutdown mode. Shutdown may be enabled by

driving the Shutdown pin to a logic low (GND).

Output short circuit protection prevents the device

from being damaged during fault conditions. Superior

click and pop suppression eliminates audible

transients on power up/down and during shutdown.

Independent left/right shutdown control maximizes

power savings in mixed mono/stereo applications.