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TDA3664

Very low dropout voltage/quiescent current 5 V voltage regulator

Philips Electronics 

Philips Semiconductors

Very low dropout voltage/quiescent

current 5 V voltage regulator

Preliminary specification

TDA3664

TEST AND APPLICATION INFORMATION

Test information

handbook, halfpVaPge

C1(1)

1 µF

1

3

TDA3664

2, 4

REG(3)

C2(2)

MDA960

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

(2) C2 = 10 µF.

(3) VREG = 5 V.

Fig.4 Test circuit (SOT223).

Application information

NOISE

The output noise is determined by the value of the output

capacitor, see Table 1.

Table 1 Noise figures

OUTPUT

CURRENT

IO (mA)

0.5

50

NOISE FIGURE (µV)(1)

CO = 10 µF

550

650

CO = 47 µF CO = 100 µF

320

300

400

400

Note

1. Measured at a bandwidth of 10 Hz to 100 kHz.

STABILITY

The regulator is stabilized with an external capacitor on the

output. The value of this capacitor can be selected using

the diagrams shown in Fig.5 and Fig.6. The four examples

on the next page show the effects of the stabilization circuit

using different values for the output capacitor.

102

handbook, halfpage

ESR

(Ω)

10

1

MDA961

(1)

stable region

10−1

10−1

(2)

1

10 C2 (µF) 102

handbook1, 0h3alfpage

ESR

(Ω)

102

22

10

stable region

1

MDA962

10−1

1

10

102

103

IREG (mA)

(1) Maximum ESR (Equivalent Series resistance)

at 200 µA ≤ IREG ≤ 100 mA.

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

Fig.5 Curve for selecting the value of the output

capacitor.

Fig.6 ESR dependency due to IREG for selecting

the right type of output capacitor.

1999 Sep 01

6

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