TDA3606AT datasheet(8/16 Pages) PHILIPS

8 / 16 page

1998 May 07

Philips Semiconductors

Product speciﬁcation

Multiple voltage regulator with battery

detection

TDA3606A

TEST AND APPLICATION INFORMATION

Test information

Fig.5 Test circuit.

(1) Capacitor not required for stability.

handbook, full pagewidth

MGK598

reset 1 output

reset 2 output

1 k

Ω

battery output voltage

RL(RES1)

1 k

Ω

RL(RES2)

1 k

Ω

RL(bat)

TDA3606A

GND

battery input voltage

VI(bat)

(1)

regulator output

µF

1 k

Ω .. 0.5 Ω

RL(REG)

Application information

NOISE

The noise at the output of the regulator depends on the

bandwidth of the regulator, which can be adjusted by

means of the output capacitor. In Table 1 the noise figures

are given.

Table 1

Noise ﬁgures

Note

1. Measured at a bandwidth of 10 Hz to 100 kHz.

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 regulator is translated into a current noise by

means of the output capacitor). When a high frequency

capacitor of 220 nF in parallel with an electrolytic capacitor

OUTPUT

CURRENT

IO (mA)

NOISE FIGURE (

µV)(1)

AT OUTPUT CAPACITOR CL (µF)

100

0.5

250

200

180

of 100

µF is connected directly to pins 17 and 7 (supply

and ground) the noise is minimized.

STABILITY

The regulator is stabilized by means of the output

capacitor. The value of the output capacitor can be

selected using the diagram shown in Fig.6. The following

two examples show the effects of the stabilization circuit

using different values for the output capacitor.

Example 1

The regulator is stabilized using an electrolytic output

capacitor of 68

µF (ESR = 0.5 Ω). At −40 °C the capacitor

value is decreased to 22

µF and the ESR is increased to

3.5

Ω. The regulator will remain stable at a temperature of

−40 °C.

Example 2

The regulator is stabilized using an electrolytic output

capacitor of 10

µF (ESR = 3.3 Ω). At −40 °C the capacitor

value is decreased to 3

µF and the ESR is increased to

23.1

Ω. The regulator will be instable at a temperature of

−40 °C. This can be solved using a tantalum capacitor of

µF.

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