TDA3609JR Datasheet, PDF(5/20 Page) NXP Semiconductors – Multiple voltage regulator with switch and ignition buffers

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TDA3609JR Datasheet, PDF (5/20 Pages) NXP Semiconductors – Multiple voltage regulator with switch and ignition buffers

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Philips Semiconductors

Multiple voltage regulator with switch and

ignition buffers

Preliminary speciï¬cation

TDA3609JR

PINNING

SYMBOL

REG1

REG3

EN3

IGN2IN

IGN1IN

IGN1OUT

IGN2OUT

RES

EN1

ENSW

HOLD

CRES

GND

REG2

DESCRIPTION

1 supply voltage

2 regulator 1 output

3 regulator 3 output

4 enable input regulator 3

5 ignition 2 input

6 ignition 1 input

7 ignition 1 output (active LOW)

8 ignition 2 output

9 reset output

10 enable input regulator 1

11 enable input power switch

12 hold output

13 reset delay capacitor

14 ground

15 regulator 2 output

16 back-up

17 power switch output

handbook, halfpage

VP 1

REG1 2

REG3 3

EN3 4

IGN2IN 5

IGN1IN 6

IGN1OUT 7

IGN2OUT 8

RES 9 TDA3609JR

EN1 10

ENSW 11

HOLD 12

CRES 13

GND 14

REG2 15

BU 16

SW 17

MGK606

Fig.2 Pin configuration.

FUNCTIONAL DESCRIPTION

The TDA3609JR 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 TDA3609JR.

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 is 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 a

external capacitor at pin 13. 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).

The output stages (regulator 1 and 3) of this regulator have

extreme low noise behaviour and good stability. Using

small output capacitors regulator 1 and 3 are made stable.

When both regulator 2 and the supply voltage (VP > 4.5 V)

are available, regulators 1 and 3 can be operated by

means of enable inputs (pins 10 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). 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 10).

1997 Aug 15

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