TDA3665 datasheet(7/20 Pages) PHILIPS

7 / 20 page

2000 Apr 25

Philips Semiconductors

Preliminary speciﬁcation

Very low dropout voltage/quiescent current

8.5 V voltage regulator

TDA3665

TEST AND APPLICATION INFORMATION

ndbook, halfpage

MBL127

2, 4

TDA3665

µF

VREG = 8.5 V

Fig.4 Test circuit (SO4).

C1 is optional (to minimize supply noise only).

handbook, halfpage

MDA961

ESR

(

Ω)

C2 (

µF)

102

10−1

110

102

stable region

(2)

(1)

Fig.5

Graph for selecting the value of the output

capacitor.

(1) Maximum ESR at 200

µA ≤ IREG ≤ 100 mA.

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

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

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 5 and 6.

The following four examples show the effects of the

stabilization circuit using different values for the output

capacitor.

OUTPUT

CURRENT

IREG (mA)

NOISE FIGURE (

µV)

C2 = 10

µFC2 = 47 µF C2 = 100 µF

0.5

550

320

300

650

400

handbook, halfpage

MDA962

ESR

(

Ω)

IREG (mA)

103

102

10−1

110

103

102

stable region

Fig.6

ESR as a function of IREG for selecting the

value of the output capacitor.

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