TDF8553J datasheet(2/47 Pages) NXP

2 / 47 page

TDF8553J_1

Objective data sheet

Rev. 01 — 3 December 2008

2 of 47

NXP Semiconductors

TDF8553J

× 50 Watt power ampliﬁer and multiple voltage regulator

I Voltage regulators

N I2C-bus control

N Good stability for any regulator with almost any output capacitor value

N Six voltage regulators (microcontroller, display, audio processor, tuner, bus,

mechanical digital and drive)

N Selectable output voltages for regulators 1, 4 and 5

N Low dropout voltage PNP output stages

N High supply voltage ripple rejection

N Low noise for all regulators

N Two power switches (antenna switch and ampliﬁer switch)

N Standby regulators 2 and 6 (microcontroller and bus supply) operational during

load dump and thermal shut-down

N Low standby quiescent current (only regulators 2 and 6 operational)

N Second supply pin for connecting optional external DC-to-DC converter to reduce

internal dissipation

N Backup functionality for regulator 2

I Protection

N If connection to the battery voltage is reversed, all regulator voltages will be zero

N Able to withstand output voltages up to 18 V (supply line may be short-circuited)

N Thermal protection to avoid thermal breakdown

N Load-dump protection

N Regulator outputs protected from DC short-circuit to ground or to supply voltage

N All regulators protected by foldback current limiting

N Power switches protected from loss-of-ground and surge conditions

Applications

I Boost ampliﬁer and voltage regulator for car radios and CD/MD players

Quick reference data

Table 1.

Quick reference data

Symbol Parameter

Conditions

Min

Typ

Max Unit

Ampliﬁers

VP(oper)

operating supply voltage RL = 4 Ω

14.4

Iq(tot)

total quiescent current

no load

280

400

Po(max)

maximum output power

RL = 4 Ω; VP = 14.4 V; VIN = 2 V RMS square wave

RL = 4 Ω; VP = 15.2 V; VIN = 2 V RMS square wave

RL = 2 Ω; VP = 14.4 V; VIN = 2 V RMS square wave

THD

total harmonic distortion Po =1Wto12W; f=1 kHz; RL =4 Ω

0.01

0.1

Vn(o)

output noise voltage

ﬁlter 20 Hz to 22 kHz; RS = 600 Ω

line driver mode

µV

ampliﬁer mode

µV

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