TLS115D0LD datasheet(21/26 Pages) INFINEON

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TLS115D0

High Precision Voltage Tracker

Application information

Data Sheet

Rev. 1.00

2016-10-13

5.2.2

Output pin

An output capacitor COUT is mandatory for the stability of the voltage tracking regulator. The requirements for

COUT are described in the table “Functional range” on Page 8. The graph “Output capacitor ESR(COUT) vs.

output current IOUT” on Page 14 shows the stable operation range of the TLS115D0.

For automotive environment, ceramic capacitors with X5R or X7R dielectrics are recommended.

Place COUT on the same side of the PCB as the regulator itself and as close as possible to both the tracker

output pin and GND pin.

In case of rapid transients of input voltage or load current, COUT must be dimensioned properly to ensure the

output stability in the application.

5.2.3

Adjust pin

Figure 4 shows a typical Adjust circuitry for a voltage tracking regulator. Typically the Adjust Pin is connected

to a fixed voltage reference that the regulator tracks. In the example of the application diagram ADJ is

connected to the supply voltage of a microcontroller. The voltage reference can also be adjusted by a voltage

divider.

5.2.4

Power Good pin

The Power Good output is an open collector output, which requires a pull-up resistor to a positive voltage rail.

The pull-up voltage must not exceed the maximum ratings of the Power Good PG shown in “Absolute

maximum ratings” on Page 7. In Figure 4 the supply voltage VDD of a microcontroller is used as pull-up

voltage for example.

To limit the external input current according to the requirement (see “Power Good output” on Page 19), the

resistor must be sized depending on the pull-up voltage.

5.3

Thermal considerations

Knowing the input voltage, the output voltage and the load profile of the application, the total power

dissipation can be calculated:

(5.1)

with

• PD: continuous power dissipation

• VIN: input voltage

• VOUT: output voltage

• IOUT: output current

• Iq: quiescent current

The maximum acceptable thermal resistance RthJA can then be calculated:

(5.2)

with

• Tj,max: maximum allowed junction temperature

• Ta: ambient temperature

VIN VOUT

–

() I

OUT

VIN Iq

RthJA max

Tjmax

–

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