lm4919 National Semiconductor Corporation, lm4919 Datasheet

lm4919

Manufacturer Part Number

lm4919

Description

1.5v, Mono 85mw Btl Output, 14mw Stereo Headphone Audio Amplifier

Manufacturer

National Semiconductor Corporation

Datasheet

1.LM4919.pdf (15 pages)

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LM4919

1.5V, Mono 85mW BTL Output, 14mW Stereo Headphone

Audio Amplifier

General Description

The unity gain stable LM4919 is both a mono-BTL audio

power amplifier and a Single Ended (SE) stereo headphone

amplifier. Operating on a single 1.5V supply, the mono BTL

mode delivers 85mW into an 8Ω load at 1% THD+N. In

Single Ended stereo headphone mode, the amplifier delivers

14mW per channel into a 16Ω load at 1% THD+N.

With the LM4919 packaged in the MM package, the cus-

tomer benefits include low profile and small size. This pack-

age minimizes PCB area and maximizes output power.

The LM4919 features circuitry that reduces output transients

("clicks" and "pops") during device turn-on and turn-off, an

externally controlled, low-power consumption, active-low

shutdown mode, and thermal shutdown. Boomer audio

power amplifiers are designed specifically to use few exter-

nal components and provide high quality output power in a

surface mount package.

Typical Application

Boomer

is a registered trademark of National Semiconductor Corporation.

DS200821

FIGURE 1. Block Diagram

Key Specifications

n Mono-BTL output power

n Stereo Headphone output power

n Micropower shutdown current

n Supply voltage operating range

n PSRR 1kHz, V

Features

n Single-cell 0.9V to 2.5V battery operation

n BTL mode for mono speaker

n Single ended headphone operation with coupling

n Unity-gain stable

n "Click and pop" suppression circuitry

n Active low micropower shutdown

n Low current, active-low mute mode

n Thermal shutdown protection circuitry

Applications

n Portable one-cell audio products

n Portable one-cell electronic devices

capacitors

= 8Ω, V

= 16Ω, V

= 1.5V, THD+N = 1%)

= 1.5V, R

= 1.5V, THD+N = 1%)

20082101

= 16Ω

0.9V

www.national.com

0.02µA (typ)

85mW (typ)

14mW (typ)

72dB (typ)

May 2004

2.5V

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