TDA3675AT datasheet(6/16 Pages) PHILIPS

6 / 16 page

2000 Feb 01

Philips Semiconductors

Preliminary speciﬁcation

Low dropout voltage/quiescent current

8.5 V voltage regulator with enable

TDA3675

TEST AND APPLICATION INFORMATION

ndbook, halfpage

MGL831

2, 3, 6, 7

VI(EN)

TDA3675

µF

C1(1)

µF

VREG = 8.5 V

Fig.3 Test circuit.

VI(EN) =5V.

(1) 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.4

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 4 and 5.

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.5

ESR as a function of IREG for selecting the

value of the output capacitor.

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