2003 Nov 28

2

Philips Semiconductors

Product specification

Multiple voltage regulators with switch

TDA3608Q; TDA3608TH

FEATURES

General

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

GENERAL DESCRIPTION

The TDA3608 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 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

that the regulator 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 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

TDA3608TH

HSOP20

plastic, heatsink small outline package; 20 leads; low stand-off height

SOT418-3