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TDA3616T/N1,112

Multiple voltage regulator with battery detection

NXP Semiconductors. 

Philips Semiconductors

Multiple voltage regulator with battery

detection

Objective specification

TDA3616

FUNCTIONAL DESCRIPTION

The TDA3616 (see Fig.1) is a voltage regulator intended

to supply a microprocessor (e.g. in car radio applications).

Because of low-voltage operation of the application, a

low-voltage drop regulator is used.

This regulator will switch-on when the backup voltage

(see Section “Backup circuit”) exceeds 7.5 V for the first

time and will switch-off again when the output voltage of

the regulator drops below 2.4 V. When the regulator is

switched on, the RES1 and RES2 outputs (RES2 can only

be HIGH when RES1 is HIGH) will go HIGH after a fixed

delay time (fixed by an external delay capacitor) to

generate a reset to the microprocessor.

Pin RES1 will go HIGH via an internal pull-up resistor of

3.1 kΩ, and is used to initialize the microprocessor.

Pin RES2 is used to indicate that the regulator output

voltage is within its voltage range. This start-up feature is

built-in to secure a smooth start-up of the microprocessor

at first connection, without uncontrolled switching of the

regulator during the start-up sequence.

The charge of the backup capacitor can be used to supply

the regulator and logic circuits for a short period of time

when the supply falls to 0 V (the time depends on the value

of the storage capacitor). The regulator is switched off at a

backup voltage of approximately 2.7 V. From this time

onwards, the backup charge will only be used for

maintaining reset functions. Due to this, the reset outputs

will remain LOW until the output of the regulator is dropped

to 0 V.

All output pins are fully protected. The regulator is

protected against load dump and short-circuit (foldback

current protection). At load dump, the battery detection

circuit will remain operating.

Interfacing with the microprocessor can be accomplished

by means of a battery Schmitt trigger and output buffer

(simple full/semi on/off logic applications). The battery

output will go HIGH when the battery input voltage

exceeds the high threshold level.

The timing diagrams are shown in Fig.4.

handbook, full pagewidth

VP

VBU

regulator

4.75 V

2.4 V

reset 2

reset 1

reset delay

2V

capacitor

battery input

battery output

2000 Jan 14

18 V

2V

Fig.4 Timing diagrams.

5

2.05 V

1.95 V

MGR095

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