Philips TDA3618JR Datasheet

INTEGRATED CIRCUITS

DATA SH EET

TDA3618JR

Multiple voltage regulator with
switch and ignition buffers

Preliminary specification
Supersedes data of 1999 Sep 01
File under Integrated Circuits, IC01

2001 Jun 07

Philips Semiconductors Preliminary 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

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 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 and

the supply line may be short-circuited

• ESD protected on all pins

• Thermal protections with hysteresis

• Load dump protection

P

• Foldback current limit protection for

• Delayed second current limit protection for the power

• The regulator outputs and the power switch are

GENERAL DESCRIPTION

TheTDA3618JR is a multiple output voltageregulator 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

• A power switch with protection, operated by an enable

• Reset and hold outputs that can be used to interface

• A supply pin that can withstand load dump pulses and

• Regulator 2, which is switched on at a backup voltage

• Aprovision for the use ofa reserve supply capacitor that

• An inverted ignition 1 input with open-collector output

• An ignition 2 input Schmitt trigger with push-pull output

TDA3618JR

regulators 1, 2 and 3

switch at short-circuit

DC short-circuit safe to ground and VP.

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

input

with the microcontroller; the reset signal can be used to
wake up the microcontroller

negative supply voltages

greater than 6.5 V and off when the output voltage of
regulator 2 drops below 1.9 V

will hold enough energy for regulator 2 (5 V continuous)
to allow a microcontroller to prepare for loss of voltage

stage

stage.

2001 Jun 07 2

Philips Semiconductors Preliminary specification

Multiple voltage regulator with switch and

TDA3618JR

ignition buffers

ORDERING INFORMATION

TYPE

NUMBER

NAME DESCRIPTION VERSION

TDA3618JR DBS17P plastic DIL-bent-SIL (special bent) power package;

17 leads (lead length 12 mm)

QUICK REFERENCE DATA

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Supply

V

P

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 for t ≤ 10 minutes −−30 V
load dump protection for t ≤ 50 ms

and t

≥ 2.5 ms

r

I

q(tot)

T

j

total quiescent supply current standby mode − 310 400 µA
junction temperature −−150 °C

Voltage regulators

V

O(REG1)

V

O(REG2)

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

VP= 14.4 V

V

O(REG3)

output voltage of regulator 3 1 mA ≤ I

Power switch

V

I

drop

M

drop-out voltage ISW=1A − 0.45 0.7 V

I

= 1.8 A − 1 1.8 V

SW

peak current 3 −−A

PACKAGE

−−50 V

≤ 600 mA 8.5 9.0 9.5 V

REG1

≤ 150 mA;

REG2

≤ 750 mA 4.75 5.0 5.25 V

REG3

4.75 5.0 5.25 V

SOT475-1

2001 Jun 07 3

Philips Semiconductors Preliminary specification

Multiple voltage regulator with switch and
ignition buffers

BLOCK DIAGRAM

handbook, full pagewidth

V

V

ENSW

th(r)

= 7 V, V

1

P

11

th(f)

= 4.5 V

POWER SWITCH

&

BACK-UP SWITCH

BACK-UP CONTROL

TEMPERATURE

LOAD DUMP

PROTECTION

TDA3618JR

17

SW

16

BU

C

RES

IGN2

IGN1

EN3

EN1

IN

IN

15

REGULATOR 2

4

&

REGULATOR 3

REG2

3

REG3

TDA3618JR

10

≥1

13

&

5

6

IGNITION BUFFER

INVERTER

REGULATOR 1

&

2

REG1

12

HOLD

9

RES

8

IGN2
IGN1

OUT
OUT

7

Fig.1 Block diagram.

2001 Jun 07 4

14

GND

MGR928

Philips Semiconductors Preliminary specification

Multiple voltage regulator with switch and
ignition buffers

PINNING

SYMBOL PIN DESCRIPTION

V

P

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

IN

IGN1

IN

IGN1

OUT

IGN2

OUT

RES 9 reset output
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 output
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

V

REG1
REG3

EN3

OUT
OUT

RES

EN1

ENSW

HOLD
C

RES

GND

REG2

BU

SW

P

IN
IN

10
11
12
13
14
15
16
17

1
2
3
4
5
6
7
8
9

TDA3618JR

TDA3618JR

MGR929

2001 Jun 07 5

Fig.2 Pin configuration.

Philips Semiconductors Preliminary specification

Multiple voltage regulator with switch and
ignition buffers

FUNCTIONAL DESCRIPTION

TheTDA3618JR is a multiple output voltageregulator 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 TDA3618JR.

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
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 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 3 have an extremely
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 enable inputs (pins EN1 and EN3 respectively).

Pin HOLD is normally HIGH and is active LOW. Pin HOLD
isconnected to an open-collector NPN transistorand 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
output 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.

. The start-up feature is

RES

TDA3618JR

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 A and continuous current of 2 A
(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 the foldback protection withoutdelay. 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 or 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 timing diagrams are shown in Figs 4 and 5.

. During this time, the switch can

RES

2001 Jun 07 6

Philips Semiconductors Preliminary specification

Multiple voltage regulator with switch and
ignition buffers

handbook, full pagewidth

1

V

P

V

V

ref2

low battery

detector

ref1

output stage

TDA3618JR

TDA3618JR

2

REG1

&

EN1

EN3

out of

regulation

10

4

enable

enable

detector

REGULATOR 1

output stage

out of

regulation

detector

REGULATOR 3

OR

TEMPERATURE

PROTECTION

>150 °C

LOAD DUMP

V16

FOLDBACK

MODE

OR

buffer

MGL792

3

REG3

12

HOLD

Fig.3 Block diagram of the hold circuit.

2001 Jun 07 7

Philips Semiconductors Preliminary specification

Multiple voltage regulator with switch and
ignition buffers

handbook, full pagewidth

V

7.0 V

P

4.5 V

ignition 1

input

ignition 1

output

≤50 V

≥3.25 V

≤1.1 V

≥−100 V

5.0 V

0.2 V

Schmitt trigger ignition 1

load dump

V

P

TDA3618JR

load dump

ignition 2

input

ignition 2

output

V

P

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

>1.8 V
<1.3 V

active

passive

HIGH

LOW

Hold output

Fig.4 Timing diagram of ignition Schmitt triggers and hold output.

2001 Jun 07 8

MGR930