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TDA3617J
Multiple voltage regulator
Philips Semiconductors Preliminary specification
Multiple voltage regulator TDA3617
FEATURES
General Three VP-state controlled regulators
(regulators1,2 and3) Very good stability and noise behaviour Separate control pinsfor switching regulators1,2 and3 Supply voltage range from −18to +50V Low quiescent current (when regulators1,2 and 3 are
switched off) High ripple rejection Hold output for indicating regulator1 and/or2 and/or3
out of regulation.
Protections Reverse polarity safe (down to −18 V without high
reverse current) Able to withstand voltages up to 18 V at the outputs
(supply line may be short circuited) ESD protection on all pins Thermal protection Load dump protection Foldback current limit protection for
regulators1,2 and3 DC short-circuit safe to ground and VP for all regulator
outputs.
GENERAL DESCRIPTIONThe TDA3617J is a multiple output voltage regulator with
three independent regulators. It contains: Three fixed voltage regulators with foldback current
protection (regulators1,2 and3) A supplypin that can withstand load dump pulses and
negative supply voltages Independent enable inputs for regulators1,2 and3 Local temperature protection for regulator3 A hold output that can be used to interface with a
microprocessor. The hold indicates that the selected
output voltages are available and within their ranges.
QUICK REFERENCE DATA
ORDERING INFORMATION
Philips Semiconductors Preliminary specification
Multiple voltage regulator TDA3617
BLOCK DIAGRAM
PINNING
Philips Semiconductors Preliminary specification
Multiple voltage regulator TDA3617
FUNCTIONAL DESCRIPTIONThe TDA3617J is a multiple output voltage regulator with
three independent switchable regulators. When the supply
voltage (VP> 4.5V)is available, regulators1,2 and3 can operatedby meansof three independent enable inputs.
Schmitt trigger functions are included to switch the
regulators off at low battery voltage (VP<4 V). hysteresis is included to avoid random switching.
All output pins are fully protected. The regulators are
protected against load dump (the regulators switch off at
supply voltages higher than 20 V) and short circuit
(foldback current protection).
The TDA3617J has a hold circuit which indicates when
oneof the regulatorsis out-of-regulation. The hold function
is disabled when all the enable inputs are LOW
(TDA3617J in standby mode). The HOLD output (open
collector output) can be wired OR-ed with other hold
outputsof other regulator parts (e.g. TDA3618). Whenall
the regulators of the TDA3617J are disabled (switched
off), the HOLD output will be high ohmic. Because of this
feature, the hold will not influence the hold information
when wired OR-ed with other regulator parts.
Figure 3 shows the total timing of a semi-on/off logic set.
Figure 4 shows the total timing of the HOLD signal.
Philips Semiconductors Preliminary specification
Multiple voltage regulator TDA3617
LIMITING VALUESIn accordance with the Absolute Maximum Rating System (IEC 134).
Philips Semiconductors Preliminary specification
Multiple voltage regulator TDA3617
THERMAL CHARACTERISTICS
QUALITY SPECIFICATIONIn accordance with “SNW-FQ-611-E”. The number of the quality specification can be found in the “Quality Reference
Handbook”.
CHARACTERISTICS= 14.4 V; Tamb =25 °C; measured in test circuit of Fig.6; unless otherwise specified.
Philips Semiconductors Preliminary specification
Multiple voltage regulator TDA3617
Philips Semiconductors Preliminary specification
Multiple voltage regulator TDA3617
Notes Minimum operating voltage, only if VP has exceeded 4.5V. The quiescent current is measured in the standby mode. Therefore, the enable inputs of regulators1,2 and 3 are
LOW (Ven<1 V). The drop-out voltage of regulators1,2 and 3 is measured between VP and VREGn. At current limit, IREGmn is held constant (see Fig.5 for the behaviour of IREGmn). The foldback current protection limits the dissipated power at short circuit (see Fig.5). Perform the load regulation test with sine wave loadof10 kHzon the regulator output under test. Measure the RMS
ripple voltage on each of the remaining regulator outputs, using a 80 kHz low-pass filter.
