TDA3608THQ datasheet(12/22 Pages) PHILIPS

12 / 22 page

2003 Nov 28

Philips Semiconductors

Product speciﬁcation

Multiple voltage regulators with switch

TDA3608Q; TDA3608TH

Notes

1. The minimum value is the minimum operating voltage, only if VP has exceeded 6.5 V.

2. The quiescent current is measured in the standby mode. Therefore, the enable inputs of regulator 1, regulator 3 and

the power switch are grounded and RL(REG2) = ∞.

3. The voltage of the regulator drops as a result of a VP drop.

4. The rise and fall time is measured with a 10 k

Ω pull-up resistor and CL =50pF.

5. This is the threshold voltage for the delay time of the power switch. The voltage on the reset delay capacitor increases

only at low output voltage of the power switch (for example at short circuit). When the voltage on this capacitor

exceeds this threshold voltage, the power switch is set to the foldback mode. The power switch is also protected by

the temperature protection.

6. Delay time calculation:

a) Reset pulse delay:

The delay time is 47 ms for C = 47 nF.

b) Power switch delay:

The delay time is 23.5 ms for C = 47 nF.

7. The dropout voltage of regulator 1, regulator 2 and regulator 3 is measured between pin VP and pins REG1, REG2

or REG3 respectively.

8. During current limit, current Im is held constant.

9. The foldback current protection limits the dissipated power at short-circuit.

quiescent current

IREG3 = 400 mA

−

SVRR

supply voltage ripple

rejection

fi = 3 kHz; Vi = 2 V (p-p)

−

Vdrop

dropout voltage

VP = 5.75 V; IREG3 = 400 mA;

note 7

−

1.5

current limit

VREG3 > 4.5 V; see Fig.10;

note 8

0.45

0.70

−

Isc

short-circuit current

RL ≤ 0.5 Ω; see Fig.10; note 9

100

400

−

Power switch

Vdrop

dropout voltage

ISW = 1 A; note 12

−

0.45

0.7

ISW = 1.8 A; note 12

−

1.0

1.8

Vcl

clamping voltage

VP ≥ 18 V

16.2

17.2

Vfb

ﬂyback voltage

behaviour

ISW = −100 mA

−

VP + 3

Idc

continuous current

VP =16V; VSW = 13.5 V

1.8

2.0

−

peak current

VP = 17 V; see Fig.11; note 13

−−

Isc

short-circuit current

VP = 14.4 V; VSW < 3.5 V;

see Fig.11; note 14

−

0.5

−

Backup switch

Idc

continuous current

0.3

0.35

−

Vcl

clamping voltage

VP ≥ 16.7 V

−−

reverse current

VP = 0; VBU = 12.4 V; note 15

−−

900

SYMBOL

PARAMETER

CONDITIONS

MIN.

TYP.

MAX.

UNIT

d(res)

------

C(th1)

1000

[sec]

d(sw)

------

C(th2)

500

[sec]

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