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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

TEST AND APPLICATION INFORMATION

Preliminary specification

TDA3661

handbook, halfpage

VP C1(1)

1 µF

8

1

TDA3661

5

2, 3, 6, 7

R1

75.1 kΩ

R2

24.9 kΩ

MGS581

VREG

C2 = 5 V

10 µF

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

Fig.3 Test circuit.

102

handbook, halfpage

ESR

(Ω)

10

1

MDA961

(1)

stable region

10−1

10−1

(2)

1

10 C2 (µF) 102

(1) Maximum ESR at 200 µA ≤ IREG ≤ 100 mA.

(2) Minimum ESR only when IREG ≤ 200 µA.

Fig.4 Graph for selecting the value of the output

capacitor.

Noise

The output noise is determined by the value of the output

capacitor. The noise figure is measured at a bandwidth of

10 Hz to 100 kHz (see Table 1).

Table 1 Noise figures

OUTPUT

CURRENT

IREG (mA)

0.5

50

NOISE FIGURE (µV)

C2 = 10 µF C2 = 47 µF C2 = 100 µF

550

320

300

650

400

400

Stability

The regulator is stabilized with an external capacitor

connected to the output. The value of this capacitor can be

selected using the diagrams shown in Figs 4 and 5.

The following three examples show the effects of the

stabilization circuit using different values for the output

capacitor.

handbook1, 0h3alfpage

ESR

(Ω)

102

22

10

1

10−1

1

stable region

10

MDA962

102

103

IREG (mA)

Fig.5 ESR as a function of IREG for selecting the

value of the output capacitor.

2000 Feb 01

6

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