TDF8555J

I2C-bus controlled 4 x 45 W power amplifier and multiple voltage regulator


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The TDF8555J is one of a new generation of complementary quad Bridge-Tied Load (BTL) audio power amplifiers with full I²C-bus controlled diagnostics, multiple voltage regulator and two power switches intended for automotive applications.

The TDF8555J can operate at a battery voltage as low as 6 V making this amplifier suitable for stop/start-car operation. The amplifier uses a complementary DMOS output stage in a Silicon-On-Insulator (SOI)-based BCD process. The DMOS output stage ensures a high power output signal with perfect sound quality. The SOI-based BCD process ensures a robust amplifier, where latch-up cannot occur, with good separation between the four independent channels with every component isolated and without substrate currents.

The multiple voltage regulator comprises four programmable voltage regulators, two standby regulators and two power switches.

The TDF8555J is soft- and hardware downwards-compatible with its predecessor TDF8551J.

The TDF8555J includes features, such as selectable undervoltage for stop/start-cars which can be selected with additional I²C-bus instruction bytes. If these additional bytes are not sent, the TDF8555J has the same functionality as its predecessor IPAS TDF8551J.

Features and benefits

  • Amplifier
    • Stop/start-car prepared: keeps operating without audible disturbance during engine start at a battery voltage as low as 6 V
    • I²C-bus mode (3.3 V and 5 V compliant)
    • Can drive 2 Ω or 4 Ω loads
    • Speaker fault detection
    • Start-up diagnostics with load detection: open, short, present; filtered for door-slam and chatter relays
    • AC load (tweeter) detection with low and high current mode
    • Gain select after start-up without audible disturbance
    • Programmable gain (26 dB and 16 dB), independently programmable for the front and rear channels
    • Line driver mode (16 dB and mid-tap voltage 0.25VP for stop/start-cars)
    • Programmable clip detection: 2 %, 5 % or 10 %
    • Programmable thermal pre-warning
    • If the temperature protection of the regulator is activated, the amplifier is muted before the regulator is switched off
    • Loss of ground and open VP safe (with 150 mΩ series impedance and a maximum supply decoupling capacitor of 2200 μF)
    • All amplifier outputs short-circuit proof to ground, supply voltage and across the load (channel independent)
    • All pins short-circuit proof to ground
    • Temperature-controlled gain reduction to prevent audio holes at high junction temperatures
    • Programmable low battery voltage detection to enable 7.5 V or 6 V minimum battery voltage operation
    • Overvoltage protection (load-dump safe up to VP = 50 V) and overvoltage pre-warning at 16 V
    • Offset detection
  • Multiple regulator
    • Good stability for any regulator with almost any output capacitor
    • Six voltage regulators (microcontroller, display, audio processor, tuner, bus, mechanical digital and drive)
    • I²C-bus controlled
    • Selectable output voltages for regulators 1, 4 and 5
    • Low dropout voltage PNP output stages
    • High supply voltage ripple rejection
    • Low noise for all regulators
    • Two power switches (antenna switch and amplifier switch)
    • Standby regulators 2 and 6 (microcontroller and I²C-bus supply) operational during load dump and thermal shut-down
    • Low standby quiescent current (only regulators 2 and 6 operational)
    • Second supply pin for connecting optional external DC-to-DC converter to reduce internal dissipation of regulator 3
    • Backup functionality for regulator 2
  • Protection
    • If connection to the battery voltage is reversed, all regulator voltages will be zero
    • Able to withstand output voltages up to 18 V if supply line is short-circuited
    • Thermal protection to avoid thermal breakdown
    • Load-dump protection
    • Regulator outputs protected from DC short-circuit to ground or to supply voltage
    • All regulators protected by foldback current limiting
    • Power switches protected from loss-of-ground
All information on this product information page is subject to the subsequent disclaimers:

Products / Packages

Type numberOrderable part numberOrdering code (12NC)Product statusPackagePackingMarking
TDF8555J/N2TDF8555J/N2,1129352 977 61112DevelopmentSOT725-1
(DBS37P) 		TubeStandard Marking

Quality, reliability & chemical content

Type numberOrderable part numberChemical contentRoHSLeadfree conversion dateRHFIFR (FIT)MTBF (hours)MSLMSL LF
TDF8555J/N2TDF8555J/N2,112TDF8555J/N2NANA
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Ordering & availability

Type numberOrdering code(12NC)Orderable part numberRegionDistributorIn stockOrder quantityInventory dateBuy onlineSamples
TDF8555J/N29352 977 61112TDF8555J/N2,112      not available

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