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TDA3608TH
Multiple voltage regulators with switch
Philips Semiconductors Product specification
Multiple voltage regulators with switch TDA3608Q; TDA3608TH
FEATURES
General Two VP-state controlled regulators (regulator 1 and
regulator 3) and a power switch Regulator 2 and reset circuit operate during load dump
and thermal shutdown Separate control pins for switching regulator1,
regulator 3 and power switch Supply voltage range from −18to +50V Low reverse current of regulator2 Low quiescent current (when regulator 1, regulator3
and power switch are switched off) Hold output circuit for regulator 1 (only valid when
regulator 3 output voltage >1.3V) Reset and hold outputs (open-collector outputs) Adjustable reset delay time High ripple rejection Backup capacitor connection to supply regulator 2 and
reset circuit up to 25V.
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 regulator1,
regulator 2 and regulator3 Delayed foldback current limit protection for power
switch (at short-circuit); delay time fixed by reset delay
capacitor All regulator outputs and power switch are short-circuited safe to ground and VP.
GENERAL DESCRIPTIONThe TDA3608isa multiple output voltage regulator witha
power switch, intendedfor usein car radios withor without
a microcontroller. It contains: Two fixed output voltage regulators with a foldback
current protection (regulator1 and regulator3) and one
fixed output voltage regulator (regulator 2) intended to
supply a microcontroller, which also operates during
load dump and thermal shutdownA power switch with protections, operatedbyan enable
input Reset and hold outputs that can be used to interface
with the microcontroller; the reset output canbe usedto
callup the microcontroller and the hold output indicates
that the regulator1 output voltageis availableand within
the rangeA supply pin which can withstand load dump pulses and
negative supply voltages Regulator 2 which is switched on at a backup voltage
higher than 6.5V and switchedoff when the regulator2
output drops below 1.9V A provision for the use of a reserve (backup) supply
capacitor that will hold enough energy for regulator2V continuous)to allowa microcontrollerto preparefor
loss of voltage.
ORDERING INFORMATION
Philips Semiconductors Product specification
Multiple voltage regulators with switch TDA3608Q; TDA3608TH
QUICK REFERENCE DATA
Philips Semiconductors Product specification
Multiple voltage regulators with switch TDA3608Q; TDA3608TH
BLOCK DIAGRAM
Philips Semiconductors Product specification
Multiple voltage regulators with switch TDA3608Q; TDA3608TH
PINNING
Philips Semiconductors Product specification
Multiple voltage regulators with switch TDA3608Q; TDA3608TH
FUNCTIONAL DESCRIPTIONThe TDA3608isa multiple output voltage regulator witha
power switch, intendedfor usein car radios withor without microcontroller. Becauseof low-voltage operationof the
car radio, low-voltage drop regulators are used in the
TDA3608.
Backup supplyThe charge of the backup capacitor connected to pin BU
canbe usedto supply regulator2fora short period when
the supply voltage VP drops to 0 V (the time depends on
the value of the capacitor).
Regulator1When the output voltage of regulator 2 and the supply
voltage (VP> 4.5V) are both available, regulator1 canbe
operated by means of enable pin EN1 (see Fig.4).
Regulator2Regulator 2 switches on (see Fig.5) when the backup
voltage exceeds 6.5 V for the first time and switches off
when the output voltage of regulator 2 drops below 1.9V
(this is far below an engine start).
Regulator3When the output voltage of regulator 2 and the supply
voltage (VP> 4.5V) are both available, regulator3 canbe
operated by means of enable pin EN3 (see Fig.4).
ResetWhen regulator2is switchedon and the output voltageof
this regulator is within its voltage range, the reset output
(see Fig.5) will be enabled (pin RES goes HIGH through
an external pull-up resistor) to generate a reset to the
microcontroller.
The reset cycles canbe extendedby meansofan external
capacitor connected to pin CRES. This start-up feature is
includedto securea smooth start-upof the microcontroller
at first connection, without uncontrolled switching of
regulator 2 during the start-up sequence.
HoldRegulator1 hasan open-collector hold output (see Fig.4)
indicating that the output voltage is settled at 8.5V.
Pin HOLD is held HIGH by an external pull-up resistor.
When the supply voltageVP dropsor during high load, the
output voltage drops out-of-regulation and pin HOLD goes
LOW.
The hold output is only activated when VREG3> 1.3V.
When pin HOLD is connected via a pull-up resistor to the
output of regulator 3 spikes will be minimized to 1.3V
(maximum value) because the hold outputis only disabled
when VREG3< 1.3V.
Pin HOLD will be forced LOW when the load dump
protection is activated and also in the standby mode.
Power switchThe power switch can be controlled by means of enable
pin ENSW (see Fig.6).
ProtectionsAll output pins are fully protected.
The regulators are protected against load dump
(regulator 1 and regulator 3 switch off at VP>18 V) and
short-circuit (foldback current protection).
The power switch contains a foldback current protection,
but this protectionis delayedata short-circuit conditionby
the reset delay capacitor. During this time the output
current is limited to at least 2A (peak value) and
1.8A (continuous value)atVP≤18V. During the foldback
mode the current is limited to 0.5A (typical value).
The timing diagram is shown in Fig.7.
The foldback protection is activated when VSW <4V.
When regulator 2 is out-of-regulation and generates a
reset, the power switch is in the foldback mode
immediately when VSW <4V.
In the standby mode the voltage on the reset delay
capacitoris about4V and the voltageon the power switch
output is VP− 0.45V (typical value) at ISW=1 A. During
an overload condition or short-circuit the reset delay
capacitor will be charged to a higher voltage. The power
switch is in the high current mode while the capacitor is
charged, after this the switch is in the foldback mode
(VSW<4 V). While the reset delay capacitoris charged the
power switch output can reach its correct output voltage.
Now the voltageon the reset delay capacitoris decreased
rapidlyto4V. The reset output voltageis not influencedby
this changeof voltages. The timeof the high current mode
depends on the value of the reset delay capacitor.
At VP>18 V the power switch is clamped at maximum
17.2 V (to avoid that external connected circuitry is being
damaged by an overvoltage) and the power switch will
switch off at load dump.
Philips Semiconductors Product specification
Multiple voltage regulators with switch TDA3608Q; TDA3608TH
Philips Semiconductors Product specification
Multiple voltage regulators with switch TDA3608Q; TDA3608TH
Philips Semiconductors Product specification
Multiple voltage regulators with switch TDA3608Q; TDA3608TH
LIMITING VALUESIn accordance with the Absolute Maximum Rating System (IEC 60134).
THERMAL CHARACTERISTICS
CHARACTERISTICS= 14.4 V; Tamb =25 °C; measured in test circuit of Fig.12; unless otherwise specified.
Philips Semiconductors Product specification
Multiple voltage regulators with switch TDA3608Q; TDA3608TH
Philips Semiconductors Product specification
Multiple voltage regulators with switch TDA3608Q; TDA3608TH
