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TDA3661

Very low dropout voltage/quiescent current adjustable voltage regulator

Philips Electronics 

Philips Semiconductors

Very low dropout voltage/quiescent current

adjustable voltage regulator

Preliminary specification

TDA3661

APPLICATION CIRCUIT WITH ENABLE FUNCTION

An enable function can easily be built with the TDA3661 by

connecting a diode to pin ADJ. When the voltage on

pin ADJ is forced above 1.3 V, the output will switch off.

The standby current is equal to the quiescent current of the

TDA3661.

The application circuit is given in Fig.7.

handbook, halfpage

VP

C1(1)

1 µF

8

1

TDA3661

5

2, 3, 6, 7

R1

75.1 kΩ

R2 D1

24.9 kΩ

VREG

C2 = 5 V

10 µF

enable

MGS583

(1) C1 is optional (to minimize supply noise only).

Fig.7 Application circuit with enable function.

Additional application information

This section gives typical curves for various parameters measured on the TDA3661AT. Standard test conditions are:

VP = 14.4 V, Tamb = 25 °C and k = 4.01929.

25

handbook, halfpage

Iq

(µA)

20

15

MDA947

10

5

0

0

10

20

30

VP (V)

IREG = 0 mA.

Fig.8 Quiescent current as a function of the

supply voltage.

2000 Feb 01

handbook, h4alfpage

Iq

(mA)

3

MDA949

2

1

0

0

10

20

30

40

50

VP (V)

Fig.9 Quiescent current increase as a function of

high supply voltage.

8

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