TDA3604Q datasheet(13/20 Pages) PHILIPS

13 / 20 page

1997 Aug 21

Philips Semiconductors

Product speciﬁcation

Multiple voltage regulators with external

reset delay and switch

TDA3604Q; TDA3604TH

TEST AND APPLICATION INFORMATION

Fig.7 Test circuit (for DBS13P package; SOT141-6).

(1) Capacitor not required for stability.

handbook, full pagewidth

MBE238

regulator 2

output

regulator 1

output

reset

output

µF

power switch

output

220 nF

µF

47 nF

ignition output

47 k

Ω

1 k

Ω

1 k

Ω

5 V

8.5 V

R L(sw)

1 k

Ω

R L(REG1)

1 k

Ω

R L(REG2)

TDA3604Q

ground

power switch

input

power switch

enable input

regulator 1

enable input

ignition input

reset delay capacitor

supply voltage

Ven(sw)

V l(sw)

220 nF

(1)

1 k

Ω

Ven(REG1)

VI(ig)

Noise information

The noise at the output of the regulators depends on the

bandwidth of the regulators, which can be adjusted by the

output capacitors. Table 1 shows the noise figures.

Although stability is guaranteed when CL is higher than

µF (over temperature range) with tan (φ) = 1 in the

frequency range 1 to 10 kHz, however, for low noise, a

µF load capacitor is required.

The noise on the supply line depends on the value of the

supply capacitor and is caused by a current noise (output

noise of the regulators is translated into a current noise by

the output capacitors). When a high frequency capacitor of

220 nF with an electrolytic capacitor of 100

µF in parallel is

placed directly over VP and GND (pins of supply voltage

and ground) the noise is minimized.

Table 1

Noise ﬁgures

Note

1. Bandwidth of 100 kHz.

REGULATOR

NOISE (

µV)(1)

OUTPUT

CAPACITOR (

µF)

180

100

120

100

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