1997 Aug 14

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

1997 Aug 14

Philips Semiconductors

Preliminary specification

Multiple voltage regulator with switch

TDA3608Q

PINNING

SYMBOL

PIN

DESCRIPTION

supply voltage

REG1

regulator 1 output

REG3

regulator 3 output

EN3

enable input regulator 3

RES

reset output

EN1

enable input regulator 1

ENSW

enable input power switch

HOLD

hold output

RES

reset delay capacitor

GND

ground

REG2

regulator 2 output

back-up

power switch output

Fig.2 Pin configuration.

handbook, halfpage

TDA3608Q

MGK601

REG1

REG3

EN3

EN1

ENSW

HOLD

REG2

RES

CRES

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

Philips Semiconductors

Preliminary specification

Multiple voltage regulator with switch

TDA3608Q

CHARACTERISTICS

= 14.4 V; T

amb

= 25

C; see Fig.6; unless otherwise specified.

SYMBOL

PARAMETER

CONDITIONS

MIN.

TYP.

MAX.

UNIT

Supply

supply voltage

operating

9.5

14.4

regulator 2 on

note 1

2.4

14.4

jump start

10 minutes

load dump protection

50 ms; t

2.5 ms

quiescent supply current

= 12.4 V; note 2;

REG2

= 0.1 mA

500

600

= 14.4 V; note 2;

REG2

= 0.1 mA

520

Schmitt trigger power supply for regulator 1, regulator 3 and power switch

thr

rising threshold voltage

4.0

4.5

5.0

thf

falling threshold voltage

3.5

4.0

4.5

hys

hysteresis voltage

0.5

Schmitt trigger for regulator 2

thr

rising threshold voltage

6.0

6.5

7.1

thf

falling threshold voltage

1.7

1.9

2.2

hys

hysteresis voltage

4.6

Schmitt trigger for enable input (regulator 1, regulator 3 and power switch)

thr

rising threshold voltage

1.7

2.2

2.7

thf

falling threshold voltage

1.5

2.0

2.5

hys

hysteresis voltage

REG

= I

= 1 mA

0.1

0.2

0.5

input leakage current

= 5 V

Schmitt trigger for reset

thr

rising threshold voltage of
regulator 2

rising; I

REG1

= 50 mA;

note 3

REG2

0.15

REG2

0.075

thf

falling threshold voltage
of regulator 2

rising; I

REG1

= 50 mA;

note 3

4.3

REG2

0.35

hys

hysteresis voltage

0.1

0.2

0.3

Schmitt trigger for hold

thr

rising threshold voltage of
regulator 1

rising; note 3

REG1

0.15

REG1

0.075

thf

falling threshold voltage
of regulator 1

rising; note 3

9.2

REG1

0.35

hys

hysteresis voltage

0.1

0.2

0.3

1997 Aug 14

Philips Semiconductors

Preliminary specification

Multiple voltage regulator with switch

TDA3608Q

Reset and hold buffer

sinkL

LOW-level sink current

RES/HOLD

0.8 V

output leakage current

= 14.4 V; V

RES/HOLD

= 5 V

rise time

note 4

fall time

note 4

Reset delay

charge current

dch

discharge current

500

800

thr

rising threshold voltage

2.5

3.0

3.5

delay time

C = 47 nF; note 5

Regulator 1 (I

REG1

= 5 mA unless otherwise specified)

O(off)

output voltage off

400

output voltage

1 mA

REG1

600 mA

8.15

8.5

8.85

11 V

18 V

8.15

8.5

8.85

line regulation

11 V

18 V

load regulation

1 mA

REG1

600 mA

quiescent current

REG1

= 600 mA

SVRR

supply voltage ripple
rejection

= 3 kHz; V

i(p-p)

= 2 V

drop-out voltage

REG1

= 550 mA; V

= 8.5 V;

note 6

0.4

0.7

current limit

REG1

> 7.5 V; note 7

0.65

1.2

short-circuit current

0.5

; note 8

250

800

Regulator 2 (I

REG2

= 5 mA unless otherwise specified)

output voltage

0.5 mA

REG2

150 mA

4.75

5.0

5.25

REG2

= 300 mA; note 9

4.75

5.0

5.25

7 V

18 V

4.75

5.0

5.25

18 V

50 V;

REG2

150 mA

4.75

5.0

5.25

line regulation

6 V

18 V

50 V

load regulation

1 mA

REG2

150 mA

1 mA

REG2

300 mA

100

SVRR

supply voltage ripple
rejection

= 3 kHz; V

i(p-p)

= 2 V

SYMBOL

PARAMETER

CONDITIONS

MIN.

TYP.

MAX.

UNIT

1997 Aug 14

Philips Semiconductors

Preliminary specification

Multiple voltage regulator with switch

TDA3608Q

drop-out voltage

REG2

= 100 mA;

= 4.75 V; note 6

0.4

0.6

REG2

= 200 mA;

= 5.75 V; note 6

0.8

1.2

REG2

= 100 mA;

= 4.75 V; note 10

0.2

0.5

REG2

= 200 mA;

= 5.75 V; note 10

0.8

1.0

current limit

REG2

> 4.5 V; note 7

0.32

0.37

short-circuit current

0.5

; note 8

100

Regulator 3 (I

REG3

= 5 mA unless otherwise specified)

O(off)

output voltage off

400

output voltage

1 mA

REG3

400 mA

4.75

5.0

5.25

7 V

18 V

4.75

5.0

5.25

line regulation

7 V

18 V

load regulation

1 mA

REG3

400 mA

quiescent current

REG3

= 400 mA

SVRR

supply voltage ripple
rejection

= 3 kHz; V

i(p-p)

= 2 V

drop-out voltage

REG3

= 400 mA;

= 5.75 V; note 6

1.5

current limit

REG3

> 4.5 V; note 7

0.45

0.70

short-circuit current

0.5

; note 8

100

400

Power switch

drop-out voltage

= 1 A; note 11

0.45

0.7

= 1.8 A; note 11

1.0

1.8

continuous current

= 16 V, V

= 13.5 V

1.8

2.0

clamping voltage

17 V

13.5

15.0

16.0

peak current

= 17 V; notes 12 and 13

fly back voltage behaviour

100 mA

+ 3

short-circuit current

= 14.4 V; V

< 1.2 V;

note 13

0.8

Back-up switch

continuous current

0.3

0.35

clamping voltage

16.7 V

reverse current

= 0; V

= 12.4 V; note 14

900

SYMBOL

PARAMETER

CONDITIONS

MIN.

TYP.

MAX.

UNIT

1997 Aug 14

Philips Semiconductors

Preliminary specification

Multiple voltage regulator with switch

TDA3608Q

Notes

1. Minimum operating voltage, only if V

has exceeded 6.5 V.

2. The quiescent current is measured in the standby mode. So, the enable inputs of regulators 1, 3 and the switch are

grounded and R

L(REG2)

(see Fig.6).

3. The voltage of the regulator sinks as a result of a V

drop.

4. The rise and fall time is measured with a 10 k

pull-up resistor and a 50 pF load capacitor.

5. The delay time depends on the value of the capacitor:

6. The drop-out voltage of regulators 1, 2 and 3 is measured between V

and REGn.

7. At current limit, I

REGmn

is held constant (see Fig.4 for behaviour of I

REGmn

8. The foldback current protection limits the dissipated power at short-circuit (see Fig.4).

9. The peak current of 300 mA can only be applied for short periods (t < 100 ms).

10. The drop-out voltage measured between BU and REG2.

11. The drop-out voltage of the power switch is measured between V

and SW.

12. The maximum output current of the power switch is limited to 1.8 A when the supply voltage exceeds 18 V.

13. At short-circuit, I

of the power switch is held constant to a lower value than the continuous current after a delay of

at least 10 ms (see Fig.5).

14. The reverse current of the back-up switch is measured when flowing out of pin V

with V

= 0 V.

------

C (th)

750

(

)

(

)

1997 Aug 14

Philips Semiconductors

Preliminary specification

Multiple voltage regulator with switch

TDA3608Q

TEST AND APPLICATION INFORMATION

Test information

handbook, full pagewidth

MGK605

regulator 2
output

regulator 1
output

enable input power switch

enable input regulator 3

back-up

reset delay
capacitor

reset
output

C3
10

C2
220 nF

R4
2.2

220 nF

C4
10

hold output

1 k

R3
10 k

R2
10 k

1 k

5 V

10 V

regulator 3
output

C5
10

C6
1

C8
220 nF

C7
47 nF

RL(sw)

RL(REG2)

1 k

RL(REG1)

1 k

RL(REG3)

power switch output

TDA3608Q

GND

supply voltage

VENSW

VEN3

enable input regulator 1

VEN1

Vbu

(1)

Fig.6 Test circuit.

(1) Capacitor not required for stability.

Application information

OISE

The noise on the supply line depends on the value of the
supply capacitor and is caused by a current noise (output
noise of the regulators is translated into a current noise by
means of the output capacitors). Table 1 shows the noise
figure with the corresponding output capacitor for each
regulator. The noise is minimal when a high frequency
capacitor of 220 nF in parallel with an electrolytic capacitor
of 100

F is connected directly to pins V

and GND.

Table 1

Noise figures

Note

1. Measured at a bandwidth of 200 kHz.

REGULATOR

NOISE FIGURE

(1)

= 10

= 47

F C

= 100

225

150

135

225

150

135

255

200

180

1997 Aug 14

Philips Semiconductors

Preliminary specification

Multiple voltage regulator with switch

TDA3608Q

TABILITY

The regulators are made stable with the external
connected output capacitors. The output capacitors can be
selected using the graphs of Figs 7 and 8.
When an electrolytic capacitor is used, the temperature
behaviour of this output capacitor can cause oscillations at
low temperature. The next two examples show how an
output capacitor value is selected.

Example 1

The regulator 1 is made stable with an electrolytic output
capacitor of 220

F, Equivalent Series Resistance

(ESR) = 0.15

. At

C the capacitor value is

decreased to 73

F and the ESR is increased to 1.1

The regulator will remain stable at

C (see Fig.7).

Example 2

The regulator 2 is made stable with a 10

F electrolytic

capacitor (ESR = 3

). At

C the capacitor value is

decreased to 3

F and the ESR is increased to 23.1

The regulator will be instable at

C (see Fig.8).

Solution

Use a tantalum capacitor of 10

F or a larger electrolytic

capacitor. The use of tantalum capacitors is recommended
to avoid problems with stability at low temperatures.

Fig.7

Curves for selecting value of output
capacitor for regulators 1 and 3.

handbook, halfpage

C (

MBK100

stable region

maximum ESR

minimum ESR

100

(

)

Fig.8

Curves for selecting value of output
capacitor for regulator 2.

handbook, halfpage

0.22

C (

MBK099

stable region

maximum ESR

minimum ESR

100

(

)

1997 Aug 14

Philips Semiconductors

Preliminary specification

Multiple voltage regulator with switch

TDA3608Q

SOLDERING

Introduction

There is no soldering method that is ideal for all IC
packages. Wave soldering is often preferred when
through-hole and surface mounted components are mixed
on one printed-circuit board. However, wave soldering is
not always suitable for surface mounted ICs, or for
printed-circuits with high population densities. In these
situations reflow soldering is often used.

This text gives a very brief insight to a complex technology.
A more in-depth account of soldering ICs can be found in
our

"IC Package Databook" (order code 9398 652 90011).

Soldering by dipping or by wave

The maximum permissible temperature of the solder is
260

C; solder at this temperature must not be in contact

with the joint for more than 5 seconds. The total contact
time of successive solder waves must not exceed
5 seconds.

The device may be mounted up to the seating plane, but
the temperature of the plastic body must not exceed the
specified maximum storage temperature (T

stg max

). If the

printed-circuit board has been pre-heated, forced cooling
may be necessary immediately after soldering to keep the
temperature within the permissible limit.

Repairing soldered joints

Apply a low voltage soldering iron (less than 24 V) to the
lead(s) of the package, below the seating plane or not
more than 2 mm above it. If the temperature of the
soldering iron bit is less than 300

C it may remain in

contact for up to 10 seconds. If the bit temperature is
between 300 and 400

C, contact may be up to 5 seconds.

DEFINITIONS

LIFE SUPPORT APPLICATIONS

These products are not designed for use in life support appliances, devices, or systems where malfunction of these
products can reasonably be expected to result in personal injury. Philips customers using or selling these products for
use in such applications do so at their own risk and agree to fully indemnify Philips for any damages resulting from such
improper use or sale.

Data sheet status

Objective specification

This data sheet contains target or goal specifications for product development.

Preliminary specification

This data sheet contains preliminary data; supplementary data may be published later.

Product specification

This data sheet contains final product specifications.

Limiting values

Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one or
more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation
of the device at these or at any other conditions above those given in the Characteristics sections of the specification
is not implied. Exposure to limiting values for extended periods may affect device reliability.

Application information

Where application information is given, it is advisory and does not form part of the specification.

Internet: http://www.semiconductors.philips.com

Philips Semiconductors a worldwide company

SCA55

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Printed in The Netherlands

547027/1200/01/pp20

Date of release: 1997 Aug 14

Document order number:

9397 750 02238

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