TDA3616T/N1,112 View Datasheet(PDF) - NXP Semiconductors.

Part Name

Description

Manufacturer

TDA3616T/N1,112

Multiple voltage regulator with battery detection

NXP Semiconductors. 

Philips Semiconductors

Multiple voltage regulator with battery

detection

Objective specification

TDA3616

Application information

NOISE

The noise at the output of the regulator depends on the

bandwidth of the regulator, which can be adjusted by the

output capacitor CL. Table 1 shows the noise figures.

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

supply capacitor CP and is caused by a current noise (the

output noise of the regulator is translated into a current

noise by the output capacitor). When a high frequency

capacitor of 220 nF (with an electrolytic capacitor of

100 µF connected in parallel) is connected directly

between pins VP and GND the noise is minimized.

Table 1 Noise figures

IO (mA)

0.5

50

NOISE FIGURE (µV)(1)

CL = 10 µF

58

250

CL = 47 µF

50

200

CL = 100 µF

45

180

Note

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

STABILITY

The regulator is stabilized by the output capacitor CL.

The value of the output capacitor can be selected using

the diagram shown in Fig.8. The following two examples

show the effects of the stabilization circuit using different

values for the output capacitor.

Remark: The behaviour of ESR as a function of the

temperature must be known.

Example 1

The regulator is stabilized using an electrolytic output

capacitor of 68 µF (ESR = 0.5 Ω). At Tamb = −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 Tamb = −40 °C.

Example 2

The regulator is stabilized using an electrolytic output

capacitor of 10 µF (ESR = 3.3 Ω). At Tamb = −40 °C the

capacitor value is decreased to 3 µF and the ESR is

increased to 23.1 Ω. The regulator will be unstable at a

temperature of Tamb = −40 °C. This can be solved by using

a tantalum capacitor of 10 µF.

handbook, full pagewidth

8

ESR

(Ω) 6

4

2

0

0.68 1

MBK118

(1)

stable region

(2)

10

100

output capacitor (µF)

1000

(1) Maximum Equivalent Series Resistance (ESR).

(2) Minimum ESR.

Fig.8 Curve for selecting the value of the output capacitor.

2000 Jan 14

11

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