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TDA3608Q
Multiple voltage regulators with switch
Philips Semiconductors Preliminary specification
Multiple voltage regulator with switch TDA3608Q
FEATURES
General Two VP-state controlled regulators (regulator 1 and3)
and a power switch Regulator 2 and reset operate during load dump and
thermal shutdown Separate control pins for switching regulator1,
regulator 3 and the power switch Supply voltage range of −18to +50V Low reverse current of regulator2 Low quiescent current (when regulator 1, regulator3,
and power switch are switched off) Hold output (only valid when regulator 1 is switched on) Reset and hold outputs (open collector outputs) Adjustable reset delay time High ripple rejection Back-up capacitor for regulator2.
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 protected on all pins Thermal protection 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-circuited safe to ground and VP.
GENERAL DESCRIPTIONThe TDA3608Q is a multiple output voltage regulator with
a power switch, intended for use in car radios with or
without a microcontroller. It contains: Two fixed voltage regulators with a foldback current
protection (regulator 1 and regulator 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 protections, operated by an enable
input Reset and hold outputs that can be used to interface by
the microcontroller. The reset signal can be used to call
up the microcontroller and the hold output indicates
regulator 1 voltage available and within range. A supply pin which can withstand load dump pulses and
negative supply voltages Regulator 2 that will be switched on at a back-up voltage
higher than 6.5 V and off when the output voltage of
regulator 2 drops below 1.9V A provision for use of a reserve supply capacitor that will
hold enough energy for regulator 2 (5 V continuous) to
allow a microcontroller to prepare for loss of voltage.
ORDERING INFORMATION
Philips Semiconductors Preliminary specification
Multiple voltage regulator with switch TDA3608Q
QUICK REFERENCE DATA
Philips Semiconductors Preliminary specification
Multiple voltage regulator with switch TDA3608Q
BLOCK DIAGRAM
Philips Semiconductors Preliminary specification
Multiple voltage regulator with switch TDA3608Q
PINNING
FUNCTIONAL DESCRIPTIONThe TDA3608Q is a multiple output voltage regulator with
a power switch, intended for use in car radios with or
without a microcontroller. Because of low-voltage
operation of the car radio, low-voltage drop regulators are
used in the TDA3608Q.
Regulator 2 will switch on when the back-up voltage
exceeds 6.5 V for the first time and will switch off again
when the output voltage of regulator 2 drops below 1.9V
(this is far below an engine start). When regulator 2 is
switched on and the output voltage of this regulator is
within its voltage range, the reset output will be enabled
(reset will go HIGH via a pull-up resistor) to generate a
reset to the microcontroller. The reset cycles can be
extended by an external capacitor at pin 9. The above
mentioned 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 charge of the back-up capacitor can be used to supply
regulator 2 for a short period when the supply falls down0 V (time depends on value of storage capacitor).
When regulator 2 and the supply voltage (VP> 4.5 V) are
both available, regulators1 and 3 can be operated by
means of enable inputs (pins 6 and 4 respectively).
Regulator 1 has a hold output (open collector) indicating
that the output voltage of this regulator is settled (held
HIGH by external pull-up resistor) and when the output
voltage of this regulator drops out of regulation (because
of supply voltage drop or high load) the hold output will go
LOW. The hold output signal is only valid when regulator1
is enabled by its enable input (pin6).
The power switch can also be controlled by means of a
separate enable input (pin 7) as shown in Fig.3 for the
behaviour of the power switch output.
All output pins are fully protected. The regulators are
protected against load dump (regulators1 and 3 will
switch off at supply voltages >18 V) and short-circuit
(foldback current protection).
The power switch contains a current protection, but this
protection is delayed at short-circuit condition for at least ms. During this time the output current is limited to a
peak value of at least 3A and 2 A continuous (VP≤18 V).
At supply voltages >17 V the power switch is clamped at
maximum 16 V (to avoid external connected circuitry being
damaged by an overvoltage) and the power switch will
switch off at load dump.
The total timing diagram is shown in Fig.3.
Philips Semiconductors Preliminary specification
Multiple voltage regulator with switch TDA3608Q
Philips Semiconductors Preliminary specification
Multiple voltage regulator with switch TDA3608Q
LIMITING VALUESIn accordance with the Absolute Maximum Rating System (IEC 134).
THERMAL CHARACTERISTICS
Philips Semiconductors Preliminary specification
Multiple voltage regulator with switch TDA3608Q
CHARACTERISTICS= 14.4 V; Tamb =25 °C; see Fig.6; unless otherwise specified.
Philips Semiconductors Preliminary specification
Multiple voltage regulator with switch TDA3608Q
Philips Semiconductors Preliminary specification
Multiple voltage regulator with switch TDA3608Q
