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© Koninklijke Philips Electronics N.V. 2005. All rights reserved.

Product data sheet

Rev. 05 — 13 June 2005

5 of 17

Philips Semiconductors

TDA3663

Very low dropout voltage/quiescent current 3.3 V voltage regulator

11. Application information

11.1 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 7).

11.2 Stability

For stable operation:

Ω (worst-case)

margin

µF and above

11.3 Application circuits

The maximum output current of the regulator equals:

The total thermal resistance of the TDA3663 can be decreased from 155 K/W to 30 K/W

for the SO8 version. For the SO4 version it can be decreased from 100 K/W to 25 K/W

when GND pins 2 and 4 of the package are soldered to the printed-circuit board.

Table 7:

Noise figures

Noise figure (

µV)

C2=10

µF

C2=47

µF

C2 = 100

µF

0.5

550

320

300

50

650

400

400

Table 8:

Minimum ESR values required

C2 = 100 nF

C2=1

µF

C2=10

µF

C2 = 100

µF

1> 0

Ω

> 1.5

Ω

>0

Ω

>0

Ω

5> 0

Ω

>0

Ω

>0

Ω

>0

Ω

10

> 0

Ω

>0

Ω

>0

Ω

>0

Ω

100

> 0

Ω

>0

Ω

>0

Ω

>0

Ω

I

REG max

()

150

T

amb

–

R

th j

a

–

()

V

P

V

REG

–

()

×

----------------------------------------------------------

150

T

amb

–

100

V

P

3.3

–

()

×

---------------------------------------- mA

()

==