TLE4278G_07 Datasheet, PDF(12/20 Page) Infineon Technologies AG – 5-V Low Drop Fixed Voltage Regulator Output voltage tolerance ≤ ±2%

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TLE4278G_07 Datasheet, PDF (12/20 Pages) Infineon Technologies AG – 5-V Low Drop Fixed Voltage Regulator Output voltage tolerance ≤ ±2%

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TLE 4278 G

Reset Switching Threshold

The present default value is 4.65 V. When using the TLE 4278 the reset threshold can

be set to 3.5 V < VQ,rt < 4.6 V by connecting an external voltage divider to pin RADJ. The

calculation can be easily done since the reset adjust input current can be neglected. If

this feature is not needed, the pin has to be connected to GND.

VQ,rt = Vref Ã (1 + R1/R2)

(3)

Definitions:

â¢ VQ,rt = Reset threshold

â¢ Vref = comparator reference voltage, typical 1.35 V

(Reset adjust input current â 50 nA)

Î 13

Band-Gap-

Reference

1.35 V

TLE 4278 G

Band-Gap-

Reference

1.35 V

30 kâ¦

14 RO

7 RADJ

3 ... 5, 10 ... 12

GND

AES03071

Figure 6

The reset output pin is internally connected to the 5 V output Q via a 30 kâ¦ pull-up

resistor. Down to an output voltage VQ of typical 1 V the reset LOW signal at pin RO is

generated.

For the timing of the reset feature please refer to Figure 5.

Data Sheet

Rev. 1.4, 2007-02-19

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