Continuous sound experience for

stop/start cars

Key features

``Supports`stop/start`cars`by`operating`voltage`range`of:``

6`-18`V

``Low`Vp`mute`level`adjustable`via`I2C`(6,`8`V)`

``Optimized`for`low`pop`(switch-on`pop`guaranteed`in`test`

program)`

``Full`(start-up)`diagnostics`with`exible`read-out

``Automotive`infotainment

Designed`for`use`in`stop/start`cars,`these`advanced`Class-AB`ampliers`support`listening`to`audio`

streams`while`the`car’s`internal`power`supply`is`down`for`engine`start.`They`operate`in`the`range`

of`6`to`18`V.

The`TDF854x`family`reects`NXP’s`ongoing`commitment`

to`improving`functionality`and`performance`in`automotive`

infotainment`systems.`Available`in`congurations`with`I2C-bus`

control`or`a`Best`Efciency`mode,`they`operate`over`a`wide`

voltage`range`and`reduce`dissipation.

The`TDF8544`uses`an`asymmetrical`input`conguration,`

delivers`an`output`power`of`28`W,`and`is`available`in`a`DBS27`

or`HSOP36`package.`

NXP quad Class-AB

ampliers TDF854x

for automotive

www.nxp.com

© 2011 NXP Semiconductors N.V.

All rights reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The

information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and

Date of release: February 2011

Document order number: 9397 750 17062

``All`pins`short`circuit`proof`to`ground``

``Thermal`protection`to`avoid`thermal`breakdown`

``Selectable`gain`16/26`dB

``No`plops`when`switching:

` -`Switch`on/switch`off`

` -`Standby`and`mute

` -`Mute`and`operating`

``Single`mode`control`pin`(standby,`operating:`mute/on)

``Low`standby`current

``Low`power`dissipation`in`any`short-circuit`condition

```Diagnostic`output`gives`clip`information`at`selectable`THD``

levels`(2,`5`and`10%)

```Indication`of`a`short`circuit`at`an`amplier`output,`short`to`

battery`and`ground

``Independent`short-circuit`protection`per`channel

``Soft`thermal`clipping`to`prevent`audio`holes`

Best Efciency mode

The`TDF8546`and`TDF8548`are`compatible`I²C`bus`controlled`

Class-AB`ampliers`with`the`added`intelligence`of`a`Best`

Efciency`mode.`In`this`mode,`the`devices`will`have`62%`less`

dissipation`compared`to`standard`Class-AB`ampliers`with`

correlated`signals`between`front`and`rear`channels.`There`is`

a`4`channel`best`efciency`mode`built`in`which`will`have`17%`

The`TDF8546`uses`an`asymmetrical`input`conguration,`

or`HSOP36`package.`The`TDF8548`uses`an`asymmetrical`

input`conguration,`delivers`an`output`power`of`28`W,`and`is`

available`in`a`DBS27`or`HSOP36`package.`

Output power

14.4 V; 10% THD @ 4 Ω Input conguration Package Class-AB amplier with I2C

control

Class-AB amplier with Best

Efciency mode