TLE4299_07 datasheet(14/25 Pages) INFINEON | Low-Drop Fixed Voltage Regulator

Part #	TLE4299

Description	Low-Drop Fixed Voltage Regulator

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Manufacturer	INFINEON [Infineon Technologies AG]

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Datasheet

14

Rev. 1.1, 2007-10-17

TLE 4299

Reset

The power on reset feature is necessary for a defined start of the microprocessor when

switching on the application. For the reset delay time after the output voltage of the

regulator is above the reset threshold, the reset signal is set High again. The reset delay

time is defined by the reset delay capacitor

C

D at pin D.

The under-voltage reset circuitry supervises the output voltage. In case

V

Q decreases

below the reset threshold the reset output is set LOW after the reset reaction time. The

reset LOW signal is generated down to an output voltage

V

Q to 1 V. Both the reset

reaction time and the reset delay time is defined by the capacitor value.

The power on reset delay time is defined by the charging time of an external delay

capacitor

C

D.

C

D = (td × ID) / ∆V

[1]

t

d = CD x ∆V / ID

[2]

With

C

D

reset delay capacitor

t

d

reset delay time

∆V

=

V

DT, typical 1.8 V for power up reset

I

ch

charge current typical 3.5

µA

For a delay capacitor

C

D =100 nF the typical power on reset delay time is 51 ms.

The reset reaction time

t

RR is the time it takes the voltage regulator to set reset output

LOW after the output voltage has dropped below the reset threshold. It is typically 1.2

µs

for delay capacitor of 100 nF. For other values for

C

D the reaction time can be estimated

using the following equation:

t

RR ∼ 10 ns / nF × CD

[3]

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