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LM4914 1W Monaural, 85mW Stereo Headphone Audio Amplifier

March 2003

LM4914

1W Monaural, 85mW Stereo Headphone Audio Amplifier

General Description

The unity-gain stable LM4914 is both a mono differential

output (for bridge-tied loads, or BTL) audio power amplifier

and a single-ended (SE) stereo headphone amplifier. Oper-

ating on a single 5V supply, the mono BTL mode delivers 1W

into an 8鈩?load. In SE stereo mode, the amplifier delivers

85mW to 32鈩?loads. The LM4914 features circuitry that

suppresses output transients ("clicks and pops").

The LM4914 is designed for notebook and other handheld

portable applications. It delivers high quality output power

from a surface-mount package and requires few external

components. The LM4914 is pin and functionally compatible

with the TPA0253.

Other features include an active-low micro-power shutdown

mode and thermal shutdown protection.

The LM4914 is available in a space efficient 10-lead

exposed-DAP TSSOP package.

j

Micro-power shutdown supply current

j

PSRR (f = 1kHz)

0.03碌A (typ)

52dB (typ)

52dB (typ)

V

DD

= at 3.0V, BTL Mode

V

DD

= at 5.0V, BTL Mode

Features

n

n

n

n

n

n

n

n

Advanced "click and pop" suppression circuitry

Stereo headphone amplifier mode

Low current micro-power shutdown mode

Thermal shutdown protection circuitry

2.5V to 5.5V operation

Unity-gain stable

Gain set with external resistors

Space-saving exposed-DAP TSSOP package

Applications

n

PDAs

n

Cellular phones

n

Handheld portable electronic devices

Key Specifications

j

BTL output power (R

L

= 8鈩?

V

DD

= at 3.0V, THD = 0.1%

V

DD

= at 5.0V, THD = 0.1%

j

SE output power (R

L

= 32鈩?

330mW (typ)

1W (typ)

30mW (typ)

85mW (typ)

V

DD

= at 3.0V, THD = 0.1%

V

DD

= at 5.0V, THD = 0.1%

Connection Diagram

200634A0

Top View

Order Number LM4914MH

See NS package Number MXF10A

Boomer

廬

is a registered trademark of National Semiconductor Corporation.

漏 2003 National Semiconductor Corporation

DS200634

www.national.com

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