LM4913

2W Monaural, 90mW Stereo Headphone Audio Amplifier

General Description

The unity-gain stable LM4913 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 2W

(typ) to a 4

Ω load (Note 1) at 0.3% THD+N. In SE stereo

mode, the amplifier will deliver 90mW to 32

Ω loads. The

LM4913 features circuitry that suppresses output transients

("clicks and pops").

The LM4913 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 LM4913 is pin and functionally compatible

with the TPA0213.

Other features include an active-low micro-power shutdown

mode and thermal shutdown protection.

The LM4913 is available a space efficient 10-lead exposed-

DAP TSSOP package.

Note 1: When operating on a 5VDC supply, an LM4913MH that has been

properly mounted to a circuit board will deliver 2W into 4

Ω. See the Applica-

tion Information sections for further information concerning PCB layout sug-

gestions to maximize the LM4913MH’s output power with a 4

Ω load.

Key Specifications

Ω)

V

V

660mW (typ)

2W (typ)

Ω and THD = 0.1%)

V

V

33mW (typ)

90mW (typ)

1µA (typ)

≤ VDD ≤

5.1V, (Fig. 1))

BTL

SE

52dB (typ)

62dB (typ)

Features

n

Advanced "click and pop" suppression circuitry

n

Stereo headphone amplifier mode

n

Low current micro-power shutdown mode

n

Thermal shutdown protection circuitry

n

2.5V to 5.5V operation

n

Unity-gain stable

n

Gain set with external resistors

n

Space-saving exposed-DAP TSSOP package

Applications

n

PDAs

n

Cellular phones

n

Handheld portable electronic devices

Connection Diagram

200617A0

Top View

Order Number LM4913MH

See NS package Number MXF10A

December 2002

© 2002 National Semiconductor Corporation

DS200617

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