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TDA3681ATH

Multiple voltage regulator with switch and ignition buffer

Philips Electronics 

Philips Semiconductors

Multiple voltage regulator with

switch and ignition buffer

Product specification

TDA3681A

FEATURES

General

• Extremely low noise behaviour and good stability with

very small output capacitors

• Second supply pin for regulators 3 and 4 to reduce

power dissipation (e.g. via a DC-to-DC converter)

• Three VP-state controlled regulators (regulators 1, 3

and 4) and a power switch

• Regulator 2, reset and ignition buffer operational during

load dump and thermal shutdown

• Combined control pin for switching regulators 1 and 3

• Separate control pins for switching regulator 4 and the

power switch

• Supply voltage range from −18 V to +50 V

• Low quiescent current in standby mode (when

regulators 1, 3 and 4 and power switch are switched off

and ignition input is low)

• Hold output for low VP, load dump and temperature

protection

• Reset (push-pull output stage) for regulator 2 and hold

output (open-collector output)

• Adjustable reset delay time

• High supply voltage ripple rejection

• Backup capacitor for regulator 2

• One independent ignition buffer (active HIGH).

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 protections

• Load dump protection

• Foldback current limit protection for regulators 1, 2, 3

and 4

• 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 supply (VP).

GENERAL DESCRIPTION

The TDA3681A is a multiple output voltage regulator with

a power switch and an ignition buffer. It is intended for use

in car radios with or without a microcontroller.

The TDA3681A contains the following:

• Four fixed voltage regulators with a foldback current

protection (regulators 1, 2, 3 and 4). Regulator 2, which

is intended to supply a microcontroller, also operates

during load dump and thermal shutdown

• Regulators 3 and 4 have a second supply pin that can

be connected to a lower supply voltage (> 6.5 V) to

reduce the power dissipation

• A power switch with protection, operated by a control

input

• Reset and hold outputs that can be used to interface

with the microcontroller; the reset signal can be used to

call up the microcontroller

• Both supply pins can withstand load dump pulses and

negative supply voltages

• Regulator 2, which is in regulation at a backup voltage

above 6.5 V

• A provision for the 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

• An ignition input Schmitt trigger with push-pull output

stage.

ORDERING INFORMATION

TYPE

NUMBER

TDA3681ATH

NAME

HSOP20

PACKAGE

DESCRIPTION

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

VERSION

SOT418-3

2003 Aug 29

2

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