TDA3608THQ datasheet(13/22 Pages) PHILIPS

13 / 22 page

2003 Nov 28

Philips Semiconductors

Product speciﬁcation

Multiple voltage regulators with switch

TDA3608Q; TDA3608TH

10. The peak current of 300 mA can only be applied for short periods (t < 100 ms).

11. The dropout voltage is measured between pins BU and REG2.

12. The dropout voltage of the power switch is measured between pins VP and SW.

13. The maximum output current of the power switch is limited to 1.8 A when VP >18V.

14. During short-circuit, current Isc of the power switch is held constant to a lower value than the continuous current after

a delay of at least 10 ms. Furthermore, a foldback function is activated after the delay. When VSW < 3.5 V, the

short-circuit current is reduced to 0.5 A (typical value). The short-circuit protection of the power switch functions best

when C1 = 220

µF and C2 = 10 µF.

15. The reverse current of the backup switch is the current which is flowing out of pin VP at VP =0V.

handbook, halfpage

≥300

MGT571

8.5

VREG1

(V)

Isc

IREG1 (mA)

Fig.8 Foldback current protection of regulator 1.

handbook, halfpage

≥50

MGT572

5.0

Isc

VREG2

(V)

IREG2 (mA)

Fig.9 Foldback current protection of regulator 2.

handbook, halfpage

≥200

MGT573

5.0

Isc

VREG3

(V)

IREG3 (mA)

Fig.10 Foldback current protection of regulator 3.

handbook, halfpage

MGT574

14.2

VSW

(V)

0.5

ISW (A)

(1)

Fig.11 Current protection of power switch.

(1) Delayed; time depends on value of capacitor C7.

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