Philips tda3608q th DATASHEETS

INTEGRATED CIRCUITS

DATA SH EET

TDA3608Q; TDA3608TH

Multiple voltage regulators with switch

Product speciﬁcation Supersedes data of 1997 Aug 14 File under Integrated Circuits, IC01

2000 Oct 13

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 regulator 1, regulator 3 and power switch

• Supply voltage range from −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 circuit for regulator 1 (only valid when regulator 3 output voltage >1.3 V)

• 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 25 V.

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 regulator 1,

regulator 2 and regulator 3

• 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 DC short-circuited safe to ground and VP.

GENERAL DESCRIPTION

The TDA3608 isamultiple output voltage regulator with a power switch, intended for use in car radios with or without a microcontroller. It contains:

• Two fixed output voltage regulators with a foldback current protection (regulator 1 and regulator 3) and one fixed output voltage regulator (regulator 2) intended to supply a microcontroller, which 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 with the microcontroller; the reset output can be used to call up the microcontroller and the hold output indicates thattheregulator 1 output voltage is available and within the range

• A supply pin which can withstand load dump pulses and negative supply voltages

• Regulator 2 which is switched on at a backup voltage higher than 6.5 V and switched off when the regulator 2 output drops below 1.9 V

• A provision for the use of a reserve (backup) supply capacitor that will hold enough energy for regulator 2 (5 Vcontinuous) to allow a microcontrollertoprepare for loss of voltage.

2000 Oct 13 2

Philips Semiconductors Product speciﬁcation

Multiple voltage regulators with switch TDA3608Q; TDA3608TH

QUICK REFERENCE DATA

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Supply

Voltage regulators

REG1

REG2

REG3

Power switch

drop

supply voltage operating 9.5 14.4 18 V

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

and t

≥ 2.5 ms

−−50 V

quiescent supply current standby mode; VP= 12.4 V − 500 600 µA junction temperature −40 − +150 °C

output voltage of regulator 1 1 mA ≤ I output voltage of regulator 2 0.5 mA ≤ I output voltage of regulator 3 1 mA ≤ I

≤ 600 mA 8.15 8.5 8.85 V

REG1

≤ 150 mA 4.75 5.0 5.25 V

REG2

≤ 400 mA 4.75 5.0 5.25 V

REG3

dropout voltage ISW=1A − 0.45 0.7 V

= 1.8 A − 1.0 1.8 V

peak current 2 −−A

ORDERING INFORMATION

TYPE

NUMBER

NAME DESCRIPTION VERSION

PACKAGE

TDA3608Q DBS13P plastic DIL-bent-SIL power package; 13 leads (lead length 12 mm) SOT141-6 TDA3608TH HSOP20 plastic, heatsink small outline package; 20 leads; low stand-off height SOT418-2

2000 Oct 13 3

Philips Semiconductors Product speciﬁcation

Multiple voltage regulators with switch TDA3608Q; TDA3608TH

BLOCK DIAGRAM

handbook, full pagewidth

(14.4 V)

1 (3)

POWER SWITCH

(17) 13

(14.2 V/1.8 A)

ENSW

EN3

EN1

7 (10)

4 (6)

6 (9)

BACKUP SWITCH

BACKUP CONTROL

TEMPERATURE

AND LOAD DUMP

PROTECTION

REGULATOR 2

REGULATOR 3

REGULATOR 1

(16) 12

(15) 11

(5) 3

(4) 2

(11) 8

REG2

REG3

REG1

HOLD

(14.2 V/100 mA)

(5 V/150 mA)

(5 V/400 mA)

(8.5 V/600 mA)

TDA3608Q

hold enable

(TDA3608TH)

9 (12)

RES

(1, 2, 7, 13, 18, 19, 20)

n.c.

Numbers in parenthesis refer to type number TDA3608TH.

Fig.1 Block diagram.

2000 Oct 13 4

10 (14) GND

(8) 5

MGK602

RES

Philips Semiconductors Product speciﬁcation

Multiple voltage regulators with switch TDA3608Q; TDA3608TH

PINNING

SYMBOL

DESCRIPTION

TDA3608Q TDA3608TH

1 3 supply voltage REG1 2 4 regulator 1 output REG3 3 5 regulator 3 output EN3 4 6 regulator 3 enable input RES 5 8 reset output EN1 6 9 regulator 1 enable input ENSW 7 10 power switch enable input HOLD 8 11 hold output C

RES

9 12 reset delay capacitor connection GND 10 14 ground REG2 11 15 regulator 2 output BU 12 16 backup capacitor connection SW 13 17 power switch output n.c. − 1, 2, 7, 13, 18,

not connected

19 and 20

handbook, halfpage

Fig.2 Pin configuration of TDA3608Q.

REG1 REG3

EN3

RES

EN1 ENSW HOLD C

RES

GND

REG2

1 2 3 4 5 6

TDA3608Q

7 8

9 10 11 12 13

MGK601

handbook, halfpage

Fig.3 Pin configuration of TDA3608TH.

n.c. n.c.

REG1 REG3

EN3

n.c.

RES

EN1

ENSW

1 2 3

4 5 6 7 8 9

TDA3608TH

MGT566

n.c.

18 17

BU REG2

GND

n.c.

RES

HOLD

2000 Oct 13 5

Philips Semiconductors Product speciﬁcation

Multiple voltage regulators with switch TDA3608Q; TDA3608TH

FUNCTIONAL DESCRIPTION

The TDA3608 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 TDA3608.

Backup supply

The charge of the backup capacitor connected to pin BU can be used to supply regulator 2 for a short period when the supply voltage VP drops to 0 V (the time depends on the value of the capacitor).

Regulator 1

When the output voltage of regulator 2 and the supply voltage (VP> 4.5 V) are both available, regulator 1 can be operated by means of enable pin EN1 (see Fig.4).

Regulator 2

Regulator 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 1.9 V (this is far below an engine start).

The hold output is only activated when V

REG3

> 1.3 V. When pin HOLD is connected via a pull-up resistor to the output of regulator 3 spikes will be minimized to 1.3 V (maximum value) because the hold output is only disabled when V

REG3

< 1.3 V.

Pin HOLD will be forced LOW when the load dump protection is activated and also in the standby mode.

Power switch

The power switch can be controlled by means of enable pin ENSW (see Fig.6).

Protections

All 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 protection is delayed at a short-circuit condition by the reset delay capacitor. During this time the output current is limited to at least 2 A (peak value) and

1.8 A (continuous value) at VP≤ 18 V. During the foldback mode the current is limited to 0.5 A (typical value).

Regulator 3

When the output voltage of regulator 2 and the supply voltage (VP> 4.5 V) are both available, regulator 3 can be operated by means of enable pin EN3 (see Fig.4).

Reset

When regulator 2 is switched on and the output voltage of 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 can be extended by means of anexternal capacitor connected to pin C

. This start-up feature is

RES

included to secure asmooth start-up ofthe microcontroller at first connection, without uncontrolled switching of regulator 2 during the start-up sequence.

Hold

Regulator 1 has an open-collector hold output (see Fig.4) indicating that the output voltage is settled at 8.5 V. Pin HOLD is held HIGH by an external pull-up resistor. When the supply voltage VPdrops or during high load, the output voltage drops out-of-regulationand pin HOLD goes LOW.

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 capacitor is about 4 V and the voltage on the power switch output is VP− 0.45 V (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).Whilethe reset delay capacitor is charged the power switch output can reach its correct output voltage. Now the voltage on the reset delay capacitor is decreased rapidlyto 4 V. The resetoutput voltage is not influencedby this change of voltages. The time of 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.

2000 Oct 13 6

Philips Semiconductors Product speciﬁcation

Multiple voltage regulators with switch TDA3608Q; TDA3608TH

handbook, full pagewidth

enable

regulator 1

enable

regulator 3

hold output

18.0 V

9.5 V

4.5 V

4.0 V

≥2.2 V ≤2.0 V

8.5 V

0 V

≥2.2 V ≤2.0 V

5.0 V

load dump

0 V

MGT568

Fig.4 Timing diagram of regulator 1, regulator 3 and hold output.

handbook, full pagewidth

backup

regulator 2

reset delay

capacitor

reset

output

18.0 V

4.0 V

6.5 V

5.4 V

5.0 V

1.9 V 0 V

5.0 V

3.0 V 0 V

5.0 V

d(res)

load dump

Fig.5 Timing diagram of backup, regulator 2 and reset output.

2000 Oct 13 7

MGT567

Philips Semiconductors Product speciﬁcation

Multiple voltage regulators with switch TDA3608Q; TDA3608TH

handbook, full pagewidth

enable

power switch

power switch output

handbook, full pagewidth

regulator 2

reset delay

voltage

reset

output

enable

power switch

voltage

power switch

current

18.0 V

4.5 V

4.0 V

≥2.2 V ≤2.0 V

16.2 V

0 V

5 V

6.4 V

4 V 3 V

0 V

5 V

0 V

2.2 V

2.0 V 14 V

4 V 0 V

2 A

0.5 A

0 A

current limit mode

load dump

Fig.6 Timing diagram of power switch output.

d(sw)

foldback mode foldback mode

d(res)

MGT569

MGT570

Fig.7 Timing diagram of current protection of power switch.

2000 Oct 13 8

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