TDF8544
I
2
C-bus controlled 4
50 W power amplifier
Rev. 2 — 29 August 2011
Product data sheet
1. General description
The TDF8544 is one of a new generation of complementary quad Bridge-Tied Load (BTL)
audio power amplifiers intended for automotive applications. It has full I
2
C-bus controlled
diagnostics, including start-up diagnostics. The TDF8544 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.
2. Features and benefits
Stop/start-car prepared: keeps operating without audible disturbance during engine
start at a battery voltage as low as 6 V
Operates in either legacy (non I
2
C-bus) or I
2
C-bus modes (3.3 V and 5 V compliant)
Four hardware-programmable I
2
C-bus addresses
Can drive 2
and 4
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
Independent selectable soft mute of front and rear channels
Programmable gain (26 dB and 16 dB), independently programmable for the front and
rear channels
Line driver mode supports engine start at a battery voltage as low as 6 V (16 dB and
mid-tap voltage 0.25V
P
)
Programmable clip detect: 2 %, 5 % or 10 %
Programmable thermal pre-warning
Pin STB can be programmed/multiplexed with second-clip detect
Clip information of each channel can be directed separately to pin DIAG or pin STB
Independent enabling of thermal-, clip- or load fault information (short across the load
or to V
P
or to ground) on pin DIAG
Loss-of-ground and open V
P
safe (minimum series resistance required)
All amplifier outputs short-circuit proof to ground, supply voltage and across the load
(channel independent)
All pins short-circuit proof to ground
NXP Semiconductors
TDF8544
I
2
C-bus controlled 4
50 W power amplifier
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 V
P
= 50 V) with overvoltage pre-warning
at 16 V
Offset detection
3. Quick reference data
Table 1.
V
P(oper)
I
q
P
o
Quick reference data
Conditions
R
L
= 4
no load
no load; V
P
= 7 V
output power
R
L
= 4
;
V
P
= 14.4 V; THD = 0.5 %
R
L
= 4
;
V
P
= 14.4 V; THD = 10 %
R
L
= 2
;
V
P
= 14.4 V; THD = 10 %
P
o(max)
THD
V
n(o)
maximum output
power
total harmonic
distortion
output noise voltage
R
L
= 4
;
V
P
= 15.2 V; V
i
= 2 V RMS square wave
R
L
= 2
;
V
P
= 14.4 V; V
i
= 2 V RMS square wave
P
o
= 1 W to 12 W; f
i
= 1 kHz; R
L
= 4
filter 20 Hz to 22 kHz (6th order); R
S
= 50
amplifier mode
line driver mode
-
-
40
25
60
33
V
V
Min
6
-
-
19
26
45
47
70
-
Typ
14.4
260
190
22
28
51
50
75
0.01
Max
18
350
-
-
-
-
-
-
0.1
Unit
V
mA
mA
W
W
W
W
W
%
operating supply
voltage
quiescent current
Symbol Parameter
4. Ordering information
Table 2.
Ordering information
Package
Name
TDF8544J/N2
TDF8544SD/N2
TDF8544TH/N2
DBS27P
RDBS27P
HSOP36
Description
plastic DIL-bent-SIL (special bent) power package; 27 leads (lead length
6.8 mm)
plastic rectangular-DIL-bent-SIL (reverse bent) power package; 27 leads
(row spacing 2.54 mm)
plastic, heatsink small outline package; 36 leads; low stand-off height
Version
SOT827-1
SOT878-1
SOT851-1
Type number
TDF8544
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 2 — 29 August 2011
2 of 54
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