Philips TDA3618AJR Datasheet

INTEGRATED CIRCUITS

DATA SH EET

TDA3618AJR

Multiple voltage regulator with switch and ignition buffers

Product speciﬁcation File under Integrated Circuits, IC01

2001 May 02

Philips Semiconductors Product speciﬁcation

Multiple voltage regulator with switch and ignition buffers

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 regulator 1, regulator 3 and the power switch

• Supply voltage range from −18 to +50 V

• Low reverse current of regulator 2

• Lowquiescentcurrentwhenregulator 1,regulator 3and

the power switch are switched off

• Hold output for low V

• Hold output for regulators 1 and 3

• Hold output for foldback mode switch

• Hold output for load dump and temperature protection

• Reset (push-pull) and hold (open collector) outputs

• Adjustable reset delay time

• High ripple rejection

• Backup capacitor for regulator 2

• Two independent ignition buffers, one inverted and with

open collector output.

Protection

• Reverse polarity safe, down to −18 V

• Able to withstand voltages up to 18 V at the outputs

(supply line may be short-circuited)

• ESD protected on all pins

• Thermal protections with hysteresis

• Load dump protection

TDA3618AJR

• 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-circuit safe to ground and VP.

GENERAL DESCRIPTION

The TDA3618AJR is a multiple output voltage regulator with a power switch and ignition buffers, intended for use in car radios with or without a microcontroller. It contains:

• Two fixed voltage regulators with foldback current protection (regulators 1 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 can be used to 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 1.9 V

• Aprovision for the use ofa reserve supply capacitor that will hold enough energy for regulator 2 (5 V 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.

ORDERING INFORMATION

TYPE

NUMBER

TDA3618AJR DBS17P plastic DIL-bent-SIL (specially bent) power package;

2001 May 02 2

NAME DESCRIPTION VERSION

17 leads (lead length 12 mm)

PACKAGE

SOT475-1

Philips Semiconductors Product speciﬁcation

Multiple voltage regulator with

TDA3618AJR

switch and ignition buffers

QUICK REFERENCE DATA

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Supply

q(tot)

Voltage regulators

O(REG1)

O(REG2)

O(REG3)

Power switch

drop

supply voltage operating 11 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;

≥ 2.5 ms

−−50 V

total quiescent supply current standby mode − 400 500 µA junction temperature −−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 8.5 9.0 9.5 V

REG1

≤ 150 mA; VP= 14.4 V 4.75 5.0 5.25 V

REG2

≤ 750 mA 4.75 5.0 5.25 V

REG3

drop-out voltage ISW=1A − 0.45 0.70 V

= 1.8 A − 1.0 1.8 V

peak current 3 −−A

2001 May 02 3

Philips Semiconductors Product speciﬁcation

Multiple voltage regulator with switch and ignition buffers

BLOCK DIAGRAM

handbook, full pagewidth

= 7 V, V

th(r)

ENSW

th(f)

= 4.5 V

POWER SWITCH

BACK-UP SWITCH

BACK-UP CONTROL

TEMPERATURE

LOAD DUMP

PROTECTION

REGULATOR 2

TDA3618AJR

REG2

RES

IGN2

IGN1

EN3

EN1

REGULATOR 3

REG3

TDA3618AJR

MGU332

REG1

HOLD

RES

IGN2 IGN1

OUT OUT

≥1

IGNITION BUFFER

INVERTER

GND

REGULATOR 1

reg2

Fig.1 Block diagram.

2001 May 02 4

Philips Semiconductors Product speciﬁcation

Multiple voltage regulator with switch and ignition buffers

PINNING

SYMBOL PIN DESCRIPTION

REG1 2 regulator 1 output REG3 3 regulator 3 output EN3 4 enable input regulator 3 IGN2

IGN1

OUT

IGN2

OUT

RES 9 reset output (push-pull) EN1 10 enable input regulator 1 ENSW 11 enable input power switch HOLD 12 hold output (active LOW) C

RES

GND 14 ground REG2 15 regulator 2 output BU 16 backup SW 17 power switch output

1 supply voltage

5 ignition 2 input 6 ignition 1 input 7 ignition 1 output (active LOW) 8 ignition 2 output

13 reset delay capacitor

handbook, halfpage

IGN2

IGN1 IGN1 IGN2

REG1 REG3

EN3

OUT OUT

RES

EN1

ENSW

HOLD C

RES

GND

REG2

2 3 4 5

7 8

9 10 11 12 13 14 15 16 17

TDA3618AJR

MGU333

Fig.2 Pin configuration.

2001 May 02 5

Philips Semiconductors Product speciﬁcation

Multiple voltage regulator with switch and ignition buffers

FUNCTIONAL DESCRIPTION

The TDA3618AJR is a multiple output voltage regulator with a power switch, intended for use in car radios with or without a microcontroller. Because of the low-voltage operation of the car radio, low-voltage drop regulators are used in the TDA3618AJR.

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 1.9 V (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 themicrocontroller. The reset cycle can be extended by an external capacitor at pin C included to secure a smoothstart-up of the microcontroller at first connection, without uncontrolled switching of regulator 2 during the start-up sequence.

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

Theoutputstagesofregulators 1 and 3haveanextremely low noise behaviour and good stability. These regulators are stabilized by using small output capacitors.

Whenboth regulator 2 and the supplyvoltage (VP> 4.5 V) are available, regulators 1 and 3 can be operated by means of the enable inputs (pins EN1 and EN3 respectively).

Pin HOLD is normally HIGH and is active LOW. Pin HOLD is connected to an 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 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 controls its own detection circuit, such that if a regulator is 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 causes a 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.

. This start-up feature is

RES

TDA3618AJR

The hold output is enabled (LOW) at low battery voltages. This indicates that it is not possible to get regulator 1 into regulation when switching it on.The hold function includes hysteresis to avoid oscillations when the regulator voltage crosses the hold threshold. Pin HOLDalso becomes LOW when the switch is in 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 protectedagainst load dump (regulators 1 and 3 switch off 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 current is limited to a peak value of at least 3 and 2 A continuous (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 VP− 0.4 V. At operational temperature, the switch can deliver at least 3 A. At high temperature, the switch can deliver approximately 2 A. During an overload condition or short-circuit (VSW<VP−3.7 V), the voltage on the reset delay capacitor rises 0.6 V above the voltage of regulator 2. This rise time depends on the capacitor connected to pin C deliver more than 3 A. The charge current of the reset delay capacitor is typically 4 µA and the voltage swing approximately 1.5 V. When regulator 2 is out of regulation and generates a reset, the switch can only deliver 2 A and will go into 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 an overvoltage) and the switch will switch off at load dump.

Interfacing with the microcontroller (simple full/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 total timing diagrams are shown in Figs 4 and 5.

. During this time, the switch can

RES

2001 May 02 6

Philips Semiconductors Product speciﬁcation

Multiple voltage regulator with switch and ignition buffers

handbook, full pagewidth

ref2

low battery

detector

ref1

output stage

TDA3618AJR

REG1

EN1

EN3

out of

regulation

enable

detector

REGULATOR 1

output stage

out of

regulation

detector

REGULATOR 3

≥ 1

TEMPERATURE

PROTECTION

>150 °C

LOAD DUMP

V16

FOLDBACK

MODE

≥ 1

buffer

MGU334

REG3

HOLD

Fig.3 Block diagram of the hold circuit.

2001 May 02 7

Philips Semiconductors Product speciﬁcation

Multiple voltage regulator with switch and ignition buffers

handbook, full pagewidth

7.0 V

4.5 V

input

≤50 V

≥3.25 V

≤1.1 V

≥−100 V

5.0 V

0.2 V

ignition 1

output

TDA3618AJR

load dump

Schmitt trigger ignition 1

load dump

ignition 2

input

ignition 2

output

enable

regulator 3

enable

regulator 1

regulator 3

regulator 1

temperature

protection

150 °C

HOLD

≤50 V ≥2.2 V

≤2.0 V

≥−100 V

5.0 V

0.2 V

Schmitt trigger ignition 2

>1.8 V <1.3 V

active

passive

HIGH

LOW

Hold output

Fig.4 Timing diagram of ignition Schmitt triggers and HOLD.

2001 May 02 8

MGR930

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