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TDA3604Q/N1

Multiple voltage regulators with external reset delay and switch

Philips Electronics 

Philips Semiconductors

Multiple voltage regulators with external

reset delay and switch

TEST AND APPLICATION INFORMATION

Product specification

TDA3604Q; TDA3604TH

handbook, full pagewidth

V l(sw)

Ven(sw)

VP

Ven(REG1)

R1

1 kΩ

power switch

C1 (1)

input

2

220 nF

power switch

enable input

7

power switch

output

13

regulator 2

output

11

supply voltage

3

C5 (1)

220 nF

TDA3604Q

regulator 1

R3

enable input

6

1 kΩ

reset delay capacitor

9

C7

47 nF

ignition input

12

VI(ig)

10

regulator 1

output

4

47 kΩ

R2

reset

output

5

ignition output

8

ground

C2

10 µF

5V

C3

10 µF

8.5 V

C4

10 µF

C5

1 µF

MBE238

R L(sw)

1 kΩ

R L(REG2)

1 kΩ

R L(REG1)

1 kΩ

(1) Capacitor not required for stability.

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

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

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

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

47 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

REGULATOR NOISE (µV)(1)

180

1

100

80

120

2

70

70

Note

1. Bandwidth of 100 kHz.

OUTPUT

CAPACITOR (µF)

10

47

100

10

47

100

1997 Aug 21

13

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