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TDA3607

Multiple voltage regulator with switch

Philips Electronics 

Philips Semiconductors

Multiple voltage regulator with switch

Preliminary specification

TDA3607

FUNCTIONAL DESCRIPTION

The TDA3607 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 3 independent enable inputs.

Schmitt-trigger functions are included to switch-off the

regulators 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 (regulators will switch-off at

supply voltages higher than 20 V) and short-circuit

(foldback current protection).

The total timing of a semi on/off logic set is shown in Fig.3.

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

5.0 V

regulator 3

0V

load dump

Fig.3 Timing diagrams.

MBG720

1997 May 05

4

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