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TDA3661A

Very low dropout voltage/quiescent current adjustable voltage regulator

Philips Electronics 

Philips Semiconductors

TDA3661

Very low dropout voltage/quiescent current voltage regulator

VP C1(1)

1 µF

8

1

TDA3661

5

2, 3, 6, 7

R1

75.1 kΩ

VREG

=5V

C2(2)

R2

24.9 kΩ

mgs582

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

(2) C2 ≤ 4700 µF

Fig 3. Application circuit with backup function

11.3.2 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 Figure 4.

VP

C1(1)

1 µF

8

1

TDA3661

5

2, 3, 6, 7

R1

75.1 kΩ

R2 D1

24.9 kΩ

VREG

=5V

C2

10 µF

enable

mgs583

C1 is optional (to minimize supply noise only)

Fig 4. Application circuit with enable function

11.4 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.

9397 750 15049

Product data sheet

Rev. 05 — 28 June 2005

© Koninklijke Philips Electronics N.V. 2005. All rights reserved.

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