Philips TDA3609JR Datasheet

INTEGRATED CIRCUITS

DATA SH EET

TDA3609JR

Multiple voltage regulator with
switch and ignition buffers

Preliminary specification
File under Integrated Circuits, IC01

1997 Aug 15

Philips Semiconductors Preliminary specification

Multiple voltage regulator with switch and
ignition buffers

FEATURES
General

• Extreme low noise behaviour and good stability with
very small output capacitors

• Two V
regulator 3) 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 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

• Two independent ignition buffers (one inverted and with

open collector output).

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 protections with hysteresis

• 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

-state controlled regulators (regulator 1 and

P

.

P

GENERAL DESCRIPTION

The TDA3609JR 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 a foldback current

• A power switch with protections, operated by an enable

• Reset and hold outputs that can be used to interface by

• A supply pin which can withstand load dump pulses and

• Regulator 2 that will be switched on at a back-up voltage

• A provision for use of a reserve supply capacitor that will

• An inverted ignition 1 input with open collector output

• An ignition 2 input Schmitt trigger with push pull output

TDA3609JR

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

input

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.

negative supply voltages.

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

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

stage.

stage.

ORDERING INFORMATION

PACKAGE

TYPE NUMBER

NAME DESCRIPTION VERSION

TDA3609JR DBS17P plastic DIL-bent-SIL (special bent) power package; 17 leads

(lead length 12 mm)

1997 Aug 15 2

SOT475-1

Philips Semiconductors Preliminary specification

Multiple voltage regulator with switch and

TDA3609JR

ignition buffers

QUICK REFERENCE DATA

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Supply

V

P

I

q(tot)

T

j

Voltage regulators

V

O(REG1)

V

O(REG2)

V

O(REG3

Power switch

V

d

I

M

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; t

≥ 2.5 ms −−50 V

r

total quiescent supply current standby mode − 500 600 µA
junction temperature −−150 °C

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

) output voltage regulator 3 1 mA ≤ I

≤ 600 mA 9.5 10.0 10.5 V

REG1

≤ 150 mA; VP= 14.4 V 4.75 5.0 5.25 V

REG2

≤ 500 mA 4.75 5.0 5.25 V

REG3

drop-out voltage Isw=1A − 0.45 0.7 V

I

= 1.8 A − 1 1.8 V

sw

peak current 3 −−A

1997 Aug 15 3

Philips Semiconductors Preliminary specification

Multiple voltage regulator with switch and
ignition buffers

BLOCK DIAGRAM

handbook, full pagewidth

V

ENSW

(14.4 V)

P

1

11

Vup = 7, V

= 4.5

fall

BACK-UP CONTROL

POWER SWITCH

&

BACK-UP SWITCH

TEMPERATURE

LOAD DUMP

PROTECTION

(14.2 V/3 A)

17

16

(14.2 V/100 mA)

TDA3609JR

SW

BU

C

RES

IGN2

IGN1

EN3

EN1

IN

IN

15

REGULATOR 2

4

&

&

10

REGULATOR 3

REGULATOR 1

TDA3609JR

13

5

6

IGNITION BUFFER

INVERTER

(5 V/100 mA)

(5 V/500 mA)

3

(10 V/600 mA)

2

12

9

8

7

REG2

REG3

REG1

HOLD

RES

IGN2

IGN1

OUT

OUT

14

Fig.1 Block diagram.

1997 Aug 15 4

GND

MGK607

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
C

RES

GND 14 ground
REG2 15 regulator 2 output
BU 16 back-up
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

TDA3609JR

TDA3609JR

MGK606

FUNCTIONAL DESCRIPTION

The TDA3609JR 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 TDA3609JR.

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 is 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 a
external capacitor at pin 13. 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.

Fig.2 Pin configuration.

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).

The output stages (regulator 1 and 3) of this regulator have
extreme low noise behaviour and good stability. Using
small output capacitors regulator 1 and 3 are made stable.

When both regulator 2 and the supply voltage (V

> 4.5 V)

P

are available, regulators 1 and 3 can be operated by
means of enable inputs (pins 10 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). 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 10).

1997 Aug 15 5

Philips Semiconductors Preliminary specification

Multiple voltage regulator with switch and
ignition buffers

The power switch can also be controlled by means of a
separate enable input (pin 11).

All output pins are fully protected. The regulators are
protected against load dump (regulator 1 and 3 will switch
off at supply voltages >18 V) and short-circuit (foldback
current protection).

The 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 (VP≤ 18 V).

handbook, full pagewidth

V

7.0 V

P

4.5 V

TDA3609JR

At supply voltages >17 V the switch is clamped at
maximum 16 V (to avoid external connected circuitry being
damaged by an overvoltage) and the switch will switch off
at load dump.

By means of two independent ignition Schmitt triggers and
ignition output buffers (one open collector and one
push-pull output), interfacing with the microcontroller can
be accomplished (simple full/semi on/off logic
applications). The ignition 1 output is inverted.

The total timing diagrams are shown in Figs 3 and 4.

load dump

ignition 1

input

ignition 1

output

V

P

ignition 2

input

ignition 2

output

≤50 V

≥3.25 V

≤1.1 V

≥−100 V

5.0 V

Enable Schmitt trigger ignition 1

load dump

≤50 V

≥2.2 V
≤2.0 V

≥−100 V

5.0 V

MGK611

Enable Schmitt trigger ignition 2

Fig.3 Timing diagram ignition Schmitt triggers.

1997 Aug 15 6