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TDA3618JR
Multiple voltage regulator with switch and ignition buffers
Philips Semiconductors Product specification
Multiple voltage regulator with
switch and ignition buffers TDA3618JR
FEATURES
General Extremely low noise behaviour and good stability with
very small output capacitors Two VP-state controlled regulators and a power switch Regulator 2, reset and ignition buffer operate during
load dump and thermal shutdown Separate control pins for switching regulator1,
regulator 3 and the power switch Supply voltage range from −18to +50V Low reverse current of regulator2 Low quiescent currentwhen regulator 1,regulator 3and
power switch are switched off Hold output for lowVP Hold output for regulators1 and3 Hold output for foldback mode switch Hold output for load dump and temperature protection Reset and hold (open-collector) outputs Adjustable reset delay time High ripple rejection Backup capacitor for regulator2 Two independent ignition buffers, one inverted and with
open-collector output.
Protection Reverse polarity safe, down to −18V Ableto withstand voltagesupto18Vat the outputs and
the supply line may be short-circuited ESD protected on all pins Thermal protections with hysteresis Load dump protection Foldback current limit protection for
regulators1,2 and3 Delayed second current limit protection for the power
switch at short-circuit The regulator outputs and the power switch are short-circuit safe to ground and VP.
GENERAL DESCRIPTIONThe TDA3618JRisa multiple output voltage regulator with power switch and ignition buffers, intendedfor usein car
radios with or without a microcontroller. It contains: Two fixed voltage regulators with foldback current
protection (regulators1 and 3) and one fixed voltage
regulator (regulator 2) intended to supply a
microcontroller, that also operates during load dump
and thermal shutdown A power switch with protection, operated by an enable
input Reset and hold outputs that can be used to interface
with the microcontroller; the reset signal canbe usedto
wake up the microcontroller A supply pin that can withstand load dump pulses and
negative supply voltages Regulator 2, which is switched on at a backup voltage
greater than 6.5 V and off when the output voltage of
regulator 2 drops below 1.9VA provisionfor the useofa reserve supply capacitor that
will hold enough energyfor regulator2(5V continuous)
to allow a microcontroller to prepare for loss of voltage An inverted ignition 1 input with open-collector output
stage An ignition 2 input Schmitt trigger with push-pull output
stage.
Philips Semiconductors Product specification
Multiple voltage regulator with
switch and ignition buffers TDA3618JR
ORDERING INFORMATION
QUICK REFERENCE DATA
Philips Semiconductors Product specification
Multiple voltage regulator with
switch and ignition buffers TDA3618JR
BLOCK DIAGRAM
Philips Semiconductors Product specification
Multiple voltage regulator with
switch and ignition buffers TDA3618JR
PINNING
Philips Semiconductors Product specification
Multiple voltage regulator with
switch and ignition buffers TDA3618JR
FUNCTIONAL DESCRIPTIONThe TDA3618JRisa multiple output voltage regulator with
a power switch, intended for use in car radios with or
without a microcontroller. Because of the low-voltage
operationof the car radio, low-voltage drop regulators are
used in the TDA3618JR.
Regulator 2 switches on when the backup voltage
exceeds 6.5 V for the first time and switches off again
when the output voltage of regulator 2 falls below 1.9V
(this is far below an engine start). When regulator 2 is
switched on and its output voltage is within its voltage
range, the reset output is enabled to generate a reset to
the microcontroller. The reset cycle canbe extendedbyan
external capacitor at pin CRES. The start-up feature is
built-in to secure a smooth start-up of the microcontroller
at first connection, without uncontrolled switching of
regulator 2 during the start-up sequence.
The chargeof the backup capacitor canbe usedto supply
regulator2fora short period when the supply dropsto0V
(the time depends on the value of the storage capacitor).
Theoutputstagesof regulators1 and3 have anextremely
low noise behaviour and good stability. These regulators
are stabilized by using small output capacitors.
When both regulator2 and the supply voltage (VP> 4.5V)
are available, regulators1 and 3 can be operated by
means of enable inputs (pins EN1 and EN3 respectively).
Pin HOLDis normally HIGH andis active LOW. Pin HOLD connectedtoan open-collector NPN transistor and must
have an external pull-up resistor to operate. The hold
output is controlled by a low voltage detection circuit
which, when activated, pulls the warning output LOW
(enabled). The detection outputs of the regulators are
connected to an OR gate inside the IC such that the hold
output is activated (goes LOW) when the regulator
voltages of regulator 1 and/or regulator 3 are out of
regulation for any reason. Each regulator enable input
controlsits own detection circuit, such thatifa regulatoris
disabled or switched off, the detection circuit for that
regulator is disabled.
The hold circuit is also controlled by the temperature and
load dump protection. Activating the temperature or load
dump protection causesa hold (LOW) during the time the
protection is activated. When all regulators are switched
off, pin HOLD is controlled by the battery line (pin VP),
temperature protection and load dump protection.
The hold outputis enabled (LOW)at low battery voltages.
This indicates that it is not possible to get regulator 1 into
regulation when switchingit on. The hold function includes
hysteresisto avoid oscillations when the regulator voltage
crosses the hold threshold. Pin HOLD also becomes LOW
when the switchisin foldback protection mode; see Fig.4
for a timing diagram. The hold circuit block diagram is
given in Fig.3.
The power switch can also be controlled by means of a
separate enable input (pin ENSW).
All output pins are fully protected. The regulators are
protected against load dump (regulators1 and3 switchoff
at supply voltages >18 V) and short-circuit (foldback
current protection).
The switch contains a current protection. However, this
protection is delayed at short-circuit by the reset delay
capacitor. During this time, the output currentis limitedto peak valueofat least3A and continuous currentof2A
(VP≤18 V).
In the normal situation, the voltage on the reset delay
capacitor is approximately 3.5 V (depending on
temperature). The switch output is approximately− 0.4 V. At operational temperature, the switch can
deliver at least 3 A. At high temperature, the switch can
deliver approximately2A. Duringan overload conditionor
short-circuit (VSW
delay capacitor rises 0.6 V above the voltage of
regulator 2. This rise time depends on the capacitor
connected to pin CRES. During this time, the switch can
deliver more than 3 A. The charge current of the reset
delay capacitor is typically 4 μA and the voltage swing
approximately 1.5V. When regulator2is outof regulation
and generatesa reset, the switch can only deliver2A and
willgo into the foldback protection without delay.At supply
voltages >17 V, the switch is clamped at 16 V maximum
(to avoid externally connected circuits being damaged by overvoltage) and the switch will switchoffat load dump.
Interfacing with the microcontroller (simple full or semi
on/off logic applications) can be realized with two
independent ignition Schmitt triggers and ignition output
buffers (one open-collector and one push-pull output).
Ignition 1 output is inverted.
The timing diagrams are shown in Figs4 and5.
Philips Semiconductors Product specification
Multiple voltage regulator with
switch and ignition buffers TDA3618JR
Philips Semiconductors Product specification
Multiple voltage regulator with
switch and ignition buffers TDA3618JR
Philips Semiconductors Product specification
Multiple voltage regulator with
switch and ignition buffers TDA3618JR
Philips Semiconductors Product specification
Multiple voltage regulator with
switch and ignition buffers TDA3618JR
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 60134).
THERMAL CHARACTERISTICS
Philips Semiconductors Product specification
Multiple voltage regulator with
switch and ignition buffers TDA3618JR
CHARACTERISTICS= 14.4 V; Tamb =25 °C; see Fig.8; unless otherwise specified.
Philips Semiconductors Product specification
Multiple voltage regulator with
switch and ignition buffers TDA3618JR
