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TDA3609

Multiple voltage regulator with switch and ignition buffers

Philips Electronics 

Philips Semiconductors

Multiple voltage regulator with switch and

ignition buffers

Preliminary specification

TDA3609JR

FEATURES

General

• Extreme low noise behaviour and good stability with

very small output capacitors

• Two VP-state controlled regulators (regulator 1 and

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 VP.

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

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

greater 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.

• An inverted ignition 1 input with open collector output

stage.

• An ignition 2 input Schmitt trigger with push pull output

stage.

ORDERING INFORMATION

TYPE NUMBER

TDA3609JR

PACKAGE

NAME

DESCRIPTION

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

(lead length 12 mm)

VERSION

SOT475-1

1997 Aug 15

2

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