TDA3609 View Datasheet(PDF) - Philips Electronics

Part Name

Description

Manufacturer

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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