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TDA3617

Multiple voltage regulator

Philips Electronics 

Philips Semiconductors

Multiple voltage regulator

Preliminary specification

TDA3617

FUNCTIONAL DESCRIPTION

The TDA3617J is a multiple output voltage regulator with

three independent switchable regulators. When the supply

voltage (VP > 4.5 V) is available, regulators 1, 2 and 3 can

be operated by means of three independent enable inputs.

Schmitt trigger functions are included to switch the

regulators off at low battery voltage (VP < 4 V).

A hysteresis is included to avoid random switching.

All output pins are fully protected. The regulators are

protected against load dump (the regulators switch off at

supply voltages higher than 20 V) and short circuit

(foldback current protection).

The TDA3617J has a hold circuit which indicates when

one of the regulators is out-of-regulation. The hold function

is disabled when all the enable inputs are LOW

(TDA3617J in standby mode). The HOLD output (open

collector output) can be wired OR-ed with other hold

outputs of other regulator parts (e.g. TDA3618). When all

the regulators of the TDA3617J are disabled (switched

off), the HOLD output will be high ohmic. Because of this

feature, the hold will not influence the hold information

when wired OR-ed with other regulator parts.

Figure 3 shows the total timing of a semi-on/off logic set.

Figure 4 shows the total timing of the HOLD signal.

handbook, full pagewidth

VP

18.0 V

9.4 V

4.5 V

4.0 V

enable ≥2.2 V

regulator 1 ≤2.0 V

9.0 V

regulator 1

0V

enable ≥2.2 V

regulator 2 ≤2.0 V

5.0 V

regulator 2

0V

enable ≥2.2 V

regulator 3 ≤2.0 V

3.3 V

regulator 3

0V

load dump

Fig.3 Timing diagrams of a semi-on/off logic set.

MGL621

1999 Jul 14

4

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