TDA3664AT datasheet(6/16 Pages) PHILIPS

6 / 16 page

1999 Sep 01

Philips Semiconductors

Preliminary speciﬁcation

Very low dropout voltage/quiescent

current 5 V voltage regulator

TDA3664

TEST AND APPLICATION INFORMATION

Test information

Application information

NOISE

The output noise is determined by the value of the output

capacitor, see Table 1.

Table 1

Noise ﬁgures

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.

Fig.4 Test circuit (SOT223).

handbook, halfpage

MDA960

2, 4

REG(3)

C1(1)

µF

C2(2)

TDA3664

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

(2) C2 = 10

µF.

(3) VREG =5V.

OUTPUT

CURRENT

IO (mA)

NOISE FIGURE (

µV)(1)

CO =10 µFCO =47 µFCO = 100 µF

0.5

550

320

300

650

400

Fig.5

Curve for selecting the value of the output

capacitor.

(1) Maximum ESR (Equivalent Series resistance)

at 200

µA ≤ IREG ≤ 100 mA.

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

handbook, halfpage

MDA961

ESR

(

Ω)

C2 (

µF)

102

10−1

110

102

stable region

(2)

(1)

Fig.6

ESR dependency due to IREG for selecting

the right type of output capacitor.

handbook, halfpage

MDA962

ESR

(

Ω)

IREG (mA)

103

102

10−1

110

103

102

stable region

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