Philips TDA3608Q-N3, TDA3608Q-N2, TDA3608Q-N1 Datasheet

DATA SH EET

Preliminary speciﬁcation File under Integrated Circuits, IC01

1997 Aug 14

INTEGRATED CIRCUITS

TDA3608Q

Multiple voltage regulator with switch

1997 Aug 14 2

Philips Semiconductors Preliminary speciﬁcation

Multiple voltage regulator with switch TDA3608Q

FEATURES General

• Two V

-state controlled regulators (regulator 1 and 3)

and a power switch

• Regulator 2 and reset operate during load dump and thermal shutdown

• Separate control pins for switching regulator 1, regulator 3 and the power switch

• Supply voltage range of −18 to +50 V

• Low reverse current of regulator 2

• Low quiescent current (when regulator 1, regulator 3,

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 regulator 2.

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 regulators 1, 2 and 3

• Delayed second current limit protection for the power switch (at short-circuit)

• The regulator outputs and the power switch are DC short-circuited safe to ground and V

GENERAL DESCRIPTION

The 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 1.9 V

• 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

TYPE NUMBER

PACKAGE

NAME DESCRIPTION VERSION

TDA3608Q DBS13P plastic DIL-bent-SIL power package; 13 leads (lead length 12 mm) SOT141-6

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Philips Semiconductors Preliminary speciﬁcation

Multiple voltage regulator with switch TDA3608Q

QUICK REFERENCE DATA

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Supply

supply voltage

operating 9.5 14.4 18 V reverse polarity non-operating −−−18 V regulator 2 on 2.4 14.4 50 V jump start t ≤ 10 minutes −−30 V load dump protection t ≤ 50 ms; t

≥ 2.5 ms −−50 V

q(tot)

total quiescent supply current standby mode − 500 600 µA

junction temperature −−150 °C

Voltage regulators

O(REG1)

output voltage regulator 1 1 mA ≤ I

REG1

≤ 600 mA 8.15 8.5 8.85 V

O(REG2)

output voltage regulator 2 0.5 mA ≤ I

REG2

≤ 300 mA; VP= 14.4 V 4.75 5.0 5.25 V

O(REG3)

output voltage regulator 3 1 mA ≤ I

REG3

≤ 400 mA 4.75 5.0 5.25 V

Power switch

drop-out voltage ISW=1A − 0.45 0.7 V

= 1.8 A − 1 1.8 V

peak current 3 −−A

1997 Aug 14 4

Philips Semiconductors Preliminary speciﬁcation

Multiple voltage regulator with switch TDA3608Q

BLOCK DIAGRAM

Fig.1 Block diagram.

handbook, full pagewidth

MGK602

REGULATOR 2

REGULATOR 3

REGULATOR 1

TEMPERATURE

LOAD DUMP

PROTECTION

POWER SWITCH

BACK-UP SWITCH

BACK-UP CONTROL

GND

(14.4 V)

TDA3608Q

RES

REG2

REG3

REG1

(14.2 V/3 A)

(14.2 V/100 mA)

(5 V/100 mA)

(5 V/400 mA)

(8.5 V/600 mA)

SWV

ENSW

EN3

EN1

RES

HOLD

1 A after 10 ms

(short-circuit)

1997 Aug 14 5

Philips Semiconductors Preliminary speciﬁcation

Multiple voltage regulator with switch TDA3608Q

PINNING

SYMBOL PIN DESCRIPTION

1 supply voltage REG1 2 regulator 1 output REG3 3 regulator 3 output EN3 4 enable input regulator 3 RES 5 reset output EN1 6 enable input regulator 1 ENSW 7 enable input power switch HOLD 8 hold output C

RES

9 reset delay capacitor GND 10 ground REG2 11 regulator 2 output BU 12 back-up SW 13 power switch output

Fig.2 Pin configuration.

handbook, halfpage

TDA3608Q

MGK601

1 2 3 4 5 6 7 8

9 10 11 12 13

REG1 REG3

EN3

EN1 ENSW HOLD

REG2

RES

GND

FUNCTIONAL DESCRIPTION

The 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 1.9 V (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 down to 0 V (time depends on value of storage capacitor). When regulator 2 and the supply voltage (V

> 4.5 V) are both available, regulators 1 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 regulator 1 is enabled by its enable input (pin 6).

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 (regulators 1 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 10 ms. During this time the output current is limited to a peak value of at least 3 A and 2 A continuous (V

≤ 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.

1997 Aug 14 6

Philips Semiconductors Preliminary speciﬁcation

Multiple voltage regulator with switch TDA3608Q

Fig.3 Timing diagrams.

handbook, full pagewidth

regulator 2

reset delay

capacitor

reset

enable

regulator 1

regulator 3

enable

regulator 3

enable

power switch

power switch output

6.5 V

5.4 V

4.0 V

5.0 V

1.9 V 0 V

5.0 V 0 V

18.0 V

9.9 V

4.5 V

4.0 V

≥2.2 V

8.5 V

0 V

load dump

5.0 V

0 V

16.9 V

4.5 V

4.0 V

0 V

3.0 V

6.0 V

≤2.0 V

≥2.2 V ≤2.0 V

load dump

MGK603

Power switch behaviour

VP and enable Schmitt trigger

Back-up Schmitt trigger and reset behaviour

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