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Audio Power Amplifier with Boost Converter to Drive Ceramic Speakers

November 2004

LM4802B

Audio Power Amplifier with Boost Converter to Drive

Ceramic Speakers

General Description

The LM4802B integrates a Boost Converter with an Audio

Power Amplifier to drive Ceramic Speakers in portable ap-

plications. When powered by a 3V supply, it is capable of

forcing 12Vp-p across a 2碌F + 30鈩?bridge-tied-load (BTL)

with less than 1% THD+N.

Boomer audio power amplifiers were designed specifically to

provide high quality output power with a minimal amount of

external components. The LM4802B does not require boot-

strap capacitors, or snubber circuits. Therefore it is ideally

suited for portable applications requiring high output voltage

and minimal size.

The LM4802B features a low-power consumption shutdown

mode. Additionally, the LM4802B features an internal ther-

mal shutdown protection mechanism.

The LM4802B contains advanced pop & click circuitry that

eliminates noises which would otherwise occur during

turn-on and turn-off transitions.

The LM4802B is unity-gain stable. Its gain is set by external

resistors.

Key Specifications

j

Quiescent Power Supply Current

j

BTL Voltage Swing

12mA (typ)

(2碌F + 30鈩?load, 1% THD+N,

V

DD

= 3V)

j

Shutdown Current

12Vp-p (typ)

2碌A(chǔ) (max)

Features

n

Pop & click circuitry eliminates noise during turn-on and

turn-off transitions

n

Low, 2碌A(chǔ) (max) shutdown current

n

Low, 12mA (typ) quiescent current

n

12Vp-p mono BTL output, load = 2碌F + 30鈩? V

DD

= 3V

n

Short circuit protection

n

Unity-gain stable

n

External gain configuration capability

Applications

n

Cellphone

n

PDA

Connection Diagram

LM4802BLQ (5x5)

20094184

Top View

Order Number LM4802BLQ

See NS Package Number 2LQAQ028

Boomer

廬

is a registered trademark of National Semiconductor Corporation.

漏 2004 National Semiconductor Corporation

DS200941

www.national.com

next

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