TLE4263 View Datasheet(PDF) - Infineon Technologies

Part Name

Description

Manufacturer

TLE4263

5-V Low Drop Voltage Regulator

Infineon Technologies 

TLE 4263

Reset Switching Threshold

The present default value is typ. 4.65 V. When using the TLE 4263 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 = (1 + R1/R2) × VRADJ,th

(2)

Definitions:

• VQ,rt = reset threshold

• VRADJ,th = comparator reference voltage, typical 1.35 V

Watchdog Timing

The frequency of the watchdog pulses has to be higher than the minimum pulse

sequence which is set by the external reset delay capacitor CD. Calculation can be done

according to the formula given in Figure 6.

VW

VΙ

t

VQ

TWD, p

t

VD

VDU

VDWL

VRO

TWI, tr

t

t WD, L

t

TWI,

tr

=

(VDU -VDWL

Ι D, wd

)

CD

Figure 6 Timing of the Watchdog Function Reset

t

AED03099_4263

Data Sheet

11

Rev. 2.8, 2007-03-20

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